2 ******************************************************************************
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3 * @file stm32l1xx_usart.c
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4 * @author MCD Application Team
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6 * @date 05-March-2012
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7 * @brief This file provides firmware functions to manage the following
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8 * functionalities of the Universal synchronous asynchronous receiver
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9 * transmitter (USART):
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10 * + Initialization and Configuration
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12 * + Multi-Processor Communication
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14 * + Half-duplex mode
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17 * + DMA transfers management
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18 * + Interrupts and flags management
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21 ===============================================================================
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22 ##### How to use this driver #####
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23 ===============================================================================
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25 (#) Enable peripheral clock using
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26 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE) function for
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27 USART1 or using RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE)
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28 function for USART2 and USART3.
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29 (#) According to the USART mode, enable the GPIO clocks using
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30 RCC_AHBPeriphClockCmd() function. (The I/O can be TX, RX, CTS,
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32 (#) Peripheral's alternate function:
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33 (++) Connect the pin to the desired peripherals' Alternate
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34 Function (AF) using GPIO_PinAFConfig() function.
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35 (++) Configure the desired pin in alternate function by:
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36 GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF.
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37 (++) Select the type, pull-up/pull-down and output speed via
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38 GPIO_PuPd, GPIO_OType and GPIO_Speed members.
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39 (++) Call GPIO_Init() function.
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40 (#) Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware
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41 flow control and Mode(Receiver/Transmitter) using the SPI_Init()
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43 (#) For synchronous mode, enable the clock and program the polarity,
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44 phase and last bit using the USART_ClockInit() function.
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45 (#) Enable the NVIC and the corresponding interrupt using the function
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46 USART_ITConfig() if you need to use interrupt mode.
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47 (#) When using the DMA mode.
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48 (++) Configure the DMA using DMA_Init() function.
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49 (++) Active the needed channel Request using USART_DMACmd() function.
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50 (#) Enable the USART using the USART_Cmd() function.
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51 (#) Enable the DMA using the DMA_Cmd() function, when using DMA mode.
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53 Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections
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58 ******************************************************************************
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61 * <h2><center>© COPYRIGHT 2012 STMicroelectronics</center></h2>
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63 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
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64 * You may not use this file except in compliance with the License.
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65 * You may obtain a copy of the License at:
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67 * http://www.st.com/software_license_agreement_liberty_v2
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69 * Unless required by applicable law or agreed to in writing, software
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70 * distributed under the License is distributed on an "AS IS" BASIS,
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71 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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72 * See the License for the specific language governing permissions and
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73 * limitations under the License.
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75 ******************************************************************************
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78 /* Includes ------------------------------------------------------------------*/
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79 #include "stm32l1xx_usart.h"
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80 #include "stm32l1xx_rcc.h"
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82 /** @addtogroup STM32L1xx_StdPeriph_Driver
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86 /** @defgroup USART
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87 * @brief USART driver modules
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91 /* Private typedef -----------------------------------------------------------*/
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92 /* Private define ------------------------------------------------------------*/
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94 /*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */
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95 #define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \
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96 USART_CR1_PS | USART_CR1_TE | \
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99 /*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */
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100 #define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
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101 USART_CR2_CPHA | USART_CR2_LBCL))
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103 /*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */
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104 #define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))
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106 /*!< USART Interrupts mask */
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107 #define IT_MASK ((uint16_t)0x001F)
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109 /* Private macro -------------------------------------------------------------*/
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110 /* Private variables ---------------------------------------------------------*/
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111 /* Private function prototypes -----------------------------------------------*/
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112 /* Private functions ---------------------------------------------------------*/
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114 /** @defgroup USART_Private_Functions
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118 /** @defgroup USART_Group1 Initialization and Configuration functions
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119 * @brief Initialization and Configuration functions
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122 ===============================================================================
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123 ##### Initialization and Configuration functions #####
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124 ===============================================================================
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126 This subsection provides a set of functions allowing to initialize the USART
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127 in asynchronous and in synchronous modes.
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128 (+) For the asynchronous mode only these parameters can be configured:
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132 (+) Parity: If the parity is enabled, then the MSB bit of the data written
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133 in the data register is transmitted but is changed by the parity bit.
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134 Depending on the frame length defined by the M bit (8-bits or 9-bits),
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135 the possible USART frame formats are as listed in the following table:
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137 +-------------------------------------------------------------+
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138 | M bit | PCE bit | USART frame |
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139 |---------------------|---------------------------------------|
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140 | 0 | 0 | | SB | 8 bit data | STB | |
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141 |---------|-----------|---------------------------------------|
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142 | 0 | 1 | | SB | 7 bit data | PB | STB | |
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143 |---------|-----------|---------------------------------------|
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144 | 1 | 0 | | SB | 9 bit data | STB | |
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145 |---------|-----------|---------------------------------------|
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146 | 1 | 1 | | SB | 8 bit data | PB | STB | |
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147 +-------------------------------------------------------------+
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149 (+) Hardware flow control.
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150 (+) Receiver/transmitter modes.
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151 [..] The USART_Init() function follows the USART asynchronous configuration
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152 procedure(details for the procedure are available in reference manual
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154 (+) For the synchronous mode in addition to the asynchronous mode parameters
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155 these parameters should be also configured:
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156 (++) USART Clock Enabled.
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157 (++) USART polarity.
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159 (++) USART LastBit.
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160 [..] These parameters can be configured using the USART_ClockInit() function.
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167 * @brief Deinitializes the USARTx peripheral registers to their default reset values.
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168 * @param USARTx: Select the USART peripheral.
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169 * This parameter can be one of the following values: USART1, USART2, USART3,
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173 void USART_DeInit(USART_TypeDef* USARTx)
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175 /* Check the parameters */
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176 assert_param(IS_USART_ALL_PERIPH(USARTx));
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178 if (USARTx == USART1)
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180 RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
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181 RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
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183 else if (USARTx == USART2)
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185 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
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186 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
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188 else if (USARTx == USART3)
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190 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
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191 RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
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193 else if (USARTx == UART4)
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195 RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
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196 RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
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200 if (USARTx == UART5)
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202 RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
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203 RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
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209 * @brief Initializes the USARTx peripheral according to the specified
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210 * parameters in the USART_InitStruct.
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211 * @param USARTx: Select the USART peripheral.
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212 * This parameter can be one of the following values: USART1, USART2, USART3,
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214 * @param USART_InitStruct: pointer to a USART_InitTypeDef structure that
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215 * contains the configuration information for the specified USART peripheral.
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218 void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
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220 uint32_t tmpreg = 0x00, apbclock = 0x00;
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221 uint32_t integerdivider = 0x00;
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222 uint32_t fractionaldivider = 0x00;
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223 RCC_ClocksTypeDef RCC_ClocksStatus;
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225 /* Check the parameters */
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226 assert_param(IS_USART_ALL_PERIPH(USARTx));
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227 assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
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228 assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
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229 assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
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230 assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
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231 assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
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232 assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
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234 /* The hardware flow control is available only for USART1, USART2 and USART3 */
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235 if (USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None)
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237 assert_param(IS_USART_123_PERIPH(USARTx));
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240 /*---------------------------- USART CR2 Configuration -----------------------*/
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241 tmpreg = USARTx->CR2;
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242 /* Clear STOP[13:12] bits */
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243 tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
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245 /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit ------------*/
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246 /* Set STOP[13:12] bits according to USART_StopBits value */
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247 tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
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249 /* Write to USART CR2 */
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250 USARTx->CR2 = (uint16_t)tmpreg;
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252 /*---------------------------- USART CR1 Configuration -----------------------*/
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253 tmpreg = USARTx->CR1;
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254 /* Clear M, PCE, PS, TE and RE bits */
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255 tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);
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257 /* Configure the USART Word Length, Parity and mode ----------------------- */
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258 /* Set the M bits according to USART_WordLength value */
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259 /* Set PCE and PS bits according to USART_Parity value */
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260 /* Set TE and RE bits according to USART_Mode value */
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261 tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
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262 USART_InitStruct->USART_Mode;
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264 /* Write to USART CR1 */
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265 USARTx->CR1 = (uint16_t)tmpreg;
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267 /*---------------------------- USART CR3 Configuration -----------------------*/
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268 tmpreg = USARTx->CR3;
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269 /* Clear CTSE and RTSE bits */
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270 tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);
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272 /* Configure the USART HFC -------------------------------------------------*/
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273 /* Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
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274 tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
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276 /* Write to USART CR3 */
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277 USARTx->CR3 = (uint16_t)tmpreg;
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279 /*---------------------------- USART BRR Configuration -----------------------*/
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280 /* Configure the USART Baud Rate -------------------------------------------*/
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281 RCC_GetClocksFreq(&RCC_ClocksStatus);
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282 if (USARTx == USART1)
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284 apbclock = RCC_ClocksStatus.PCLK2_Frequency;
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288 apbclock = RCC_ClocksStatus.PCLK1_Frequency;
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291 /* Determine the integer part */
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292 if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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294 /* Integer part computing in case Oversampling mode is 8 Samples */
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295 integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate)));
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297 else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
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299 /* Integer part computing in case Oversampling mode is 16 Samples */
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300 integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
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302 tmpreg = (integerdivider / 100) << 4;
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304 /* Determine the fractional part */
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305 fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
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307 /* Implement the fractional part in the register */
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308 if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
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310 tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);
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312 else /* if ((USARTx->CR1 & CR1_OVER8_Set) == 0) */
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314 tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
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317 /* Write to USART BRR */
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318 USARTx->BRR = (uint16_t)tmpreg;
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322 * @brief Fills each USART_InitStruct member with its default value.
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323 * @param USART_InitStruct: pointer to a USART_InitTypeDef structure
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324 * which will be initialized.
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327 void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
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329 /* USART_InitStruct members default value */
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330 USART_InitStruct->USART_BaudRate = 9600;
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331 USART_InitStruct->USART_WordLength = USART_WordLength_8b;
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332 USART_InitStruct->USART_StopBits = USART_StopBits_1;
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333 USART_InitStruct->USART_Parity = USART_Parity_No ;
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334 USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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335 USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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339 * @brief Initializes the USARTx peripheral Clock according to the
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340 * specified parameters in the USART_ClockInitStruct.
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341 * @param USARTx: where x can be 1, 2, 3 to select the USART peripheral.
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342 * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
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343 * structure that contains the configuration information for the specified
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344 * USART peripheral.
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345 * @note The Smart Card and Synchronous modes are not available for UART4 and UART5.
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348 void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
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350 uint32_t tmpreg = 0x00;
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351 /* Check the parameters */
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352 assert_param(IS_USART_123_PERIPH(USARTx));
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353 assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
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354 assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
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355 assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
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356 assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
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358 /*---------------------------- USART CR2 Configuration -----------------------*/
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359 tmpreg = USARTx->CR2;
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360 /* Clear CLKEN, CPOL, CPHA and LBCL bits */
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361 tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
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362 /* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
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363 /* Set CLKEN bit according to USART_Clock value */
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364 /* Set CPOL bit according to USART_CPOL value */
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365 /* Set CPHA bit according to USART_CPHA value */
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366 /* Set LBCL bit according to USART_LastBit value */
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367 tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
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368 USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
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369 /* Write to USART CR2 */
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370 USARTx->CR2 = (uint16_t)tmpreg;
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374 * @brief Fills each USART_ClockInitStruct member with its default value.
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375 * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef
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376 * structure which will be initialized.
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379 void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
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381 /* USART_ClockInitStruct members default value */
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382 USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
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383 USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
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384 USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
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385 USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
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389 * @brief Enables or disables the specified USART peripheral.
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390 * @param USARTx: Select the USART peripheral.
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391 * This parameter can be one of the following values:
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392 * USART1, USART2, USART3, UART4 or UART5.
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393 * @param NewState: new state of the USARTx peripheral.
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394 * This parameter can be: ENABLE or DISABLE.
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397 void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
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399 /* Check the parameters */
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400 assert_param(IS_USART_ALL_PERIPH(USARTx));
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401 assert_param(IS_FUNCTIONAL_STATE(NewState));
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403 if (NewState != DISABLE)
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405 /* Enable the selected USART by setting the UE bit in the CR1 register */
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406 USARTx->CR1 |= USART_CR1_UE;
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410 /* Disable the selected USART by clearing the UE bit in the CR1 register */
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411 USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);
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416 * @brief Sets the system clock prescaler.
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417 * @param USARTx: Select the USART peripheral.
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418 * This parameter can be one of the following values:
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419 * USART1, USART2, USART3, UART4 or UART5.
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420 * @param USART_Prescaler: specifies the prescaler clock.
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421 * @note The function is used for IrDA mode with UART4 and UART5.
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424 void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)
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426 /* Check the parameters */
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427 assert_param(IS_USART_ALL_PERIPH(USARTx));
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429 /* Clear the USART prescaler */
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430 USARTx->GTPR &= USART_GTPR_GT;
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431 /* Set the USART prescaler */
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432 USARTx->GTPR |= USART_Prescaler;
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436 * @brief Enables or disables the USART's 8x oversampling mode.
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437 * @param USARTx: Select the USART peripheral.
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438 * This parameter can be one of the following values:
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439 * USART1, USART2, USART3, UART4 or UART5.
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440 * @param NewState: new state of the USART 8x oversampling mode.
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441 * This parameter can be: ENABLE or DISABLE.
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444 * This function has to be called before calling USART_Init()
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445 * function in order to have correct baudrate Divider value.
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448 void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
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450 /* Check the parameters */
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451 assert_param(IS_USART_ALL_PERIPH(USARTx));
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452 assert_param(IS_FUNCTIONAL_STATE(NewState));
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454 if (NewState != DISABLE)
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456 /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */
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457 USARTx->CR1 |= USART_CR1_OVER8;
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461 /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
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462 USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);
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467 * @brief Enables or disables the USART's one bit sampling method.
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468 * @param USARTx: Select the USART peripheral.
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469 * This parameter can be one of the following values:
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470 * USART1, USART2, USART3, UART4 or UART5.
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471 * @param NewState: new state of the USART one bit sampling method.
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472 * This parameter can be: ENABLE or DISABLE.
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475 void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)
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477 /* Check the parameters */
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478 assert_param(IS_USART_ALL_PERIPH(USARTx));
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479 assert_param(IS_FUNCTIONAL_STATE(NewState));
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481 if (NewState != DISABLE)
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483 /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */
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484 USARTx->CR3 |= USART_CR3_ONEBIT;
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488 /* Disable the one bit method by clearing the ONEBITE bit in the CR3 register */
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489 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);
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497 /** @defgroup USART_Group2 Data transfers functions
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498 * @brief Data transfers functions
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501 ===============================================================================
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502 ##### Data transfers functions #####
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503 ===============================================================================
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504 [..] This subsection provides a set of functions allowing to manage
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505 the USART data transfers.
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506 [..] During an USART reception, data shifts in least significant bit first
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507 through the RX pin. In this mode, the USART_DR register consists of
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508 a buffer (RDR) between the internal bus and the received shift register.
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509 When a transmission is taking place, a write instruction to
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510 the USART_DR register stores the data in the TDR register and which is
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511 copied in the shift register at the end of the current transmission.
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512 [..] The read access of the USART_DR register can be done using
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513 the USART_ReceiveData() function and returns the RDR buffered value.
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514 Whereas a write access to the USART_DR can be done using USART_SendData()
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515 function and stores the written data into TDR buffer.
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522 * @brief Transmits single data through the USARTx peripheral.
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523 * @param USARTx: Select the USART peripheral.
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524 * This parameter can be one of the following values:
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525 * USART1, USART2, USART3, UART4 or UART5.
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526 * @param Data: the data to transmit.
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529 void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)
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531 /* Check the parameters */
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532 assert_param(IS_USART_ALL_PERIPH(USARTx));
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533 assert_param(IS_USART_DATA(Data));
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535 /* Transmit Data */
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536 USARTx->DR = (Data & (uint16_t)0x01FF);
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540 * @brief Returns the most recent received data by the USARTx peripheral.
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541 * @param USARTx: Select the USART peripheral.
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542 * This parameter can be one of the following values:
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543 * USART1, USART2, USART3, UART4 or UART5.
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544 * @retval The received data.
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546 uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
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548 /* Check the parameters */
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549 assert_param(IS_USART_ALL_PERIPH(USARTx));
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552 return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);
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559 /** @defgroup USART_Group3 MultiProcessor Communication functions
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560 * @brief Multi-Processor Communication functions
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563 ===============================================================================
\r
564 ##### Multi-Processor Communication functions #####
\r
565 ===============================================================================
\r
566 [..] This subsection provides a set of functions allowing to manage the USART
\r
567 multiprocessor communication.
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568 [..] For instance one of the USARTs can be the master, its TX output is
\r
569 connected to the RX input of the other USART. The others are slaves,
\r
570 their respective TX outputs are logically ANDed together and connected
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571 to the RX input of the master. USART multiprocessor communication is
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572 possible through the following procedure:
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573 (#) Program the Baud rate, Word length = 9 bits, Stop bits, Parity,
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574 Mode transmitter or Mode receiver and hardware flow control values
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575 using the USART_Init() function.
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576 (#) Configures the USART address using the USART_SetAddress() function.
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577 (#) Configures the wake up methode (USART_WakeUp_IdleLine or
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578 USART_WakeUp_AddressMark) using USART_WakeUpConfig() function only
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580 (#) Enable the USART using the USART_Cmd() function.
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581 (#) Enter the USART slaves in mute mode using USART_ReceiverWakeUpCmd()
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584 [..] The USART Slave exit from mute mode when receive the wake up condition.
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591 * @brief Sets the address of the USART node.
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592 * @param USARTx: Select the USART peripheral.
\r
593 * This parameter can be one of the following values:
\r
594 * USART1, USART2, USART3, UART4 or UART5.
\r
595 * @param USART_Address: Indicates the address of the USART node.
\r
598 void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
\r
600 /* Check the parameters */
\r
601 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
602 assert_param(IS_USART_ADDRESS(USART_Address));
\r
604 /* Clear the USART address */
\r
605 USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);
\r
606 /* Set the USART address node */
\r
607 USARTx->CR2 |= USART_Address;
\r
611 * @brief Determines if the USART is in mute mode or not.
\r
612 * @param USARTx: Select the USART peripheral.
\r
613 * This parameter can be one of the following values:
\r
614 * USART1, USART2, USART3, UART4 or UART5.
\r
615 * @param NewState: new state of the USART mute mode.
\r
616 * This parameter can be: ENABLE or DISABLE.
\r
619 void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
621 /* Check the parameters */
\r
622 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
623 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
625 if (NewState != DISABLE)
\r
627 /* Enable the USART mute mode by setting the RWU bit in the CR1 register */
\r
628 USARTx->CR1 |= USART_CR1_RWU;
\r
632 /* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
\r
633 USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);
\r
637 * @brief Selects the USART WakeUp method.
\r
638 * @param USARTx: Select the USART peripheral.
\r
639 * This parameter can be one of the following values:
\r
640 * USART1, USART2, USART3, UART4 or UART5.
\r
641 * @param USART_WakeUp: specifies the USART wakeup method.
\r
642 * This parameter can be one of the following values:
\r
643 * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection.
\r
644 * @arg USART_WakeUp_AddressMark: WakeUp by an address mark.
\r
647 void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)
\r
649 /* Check the parameters */
\r
650 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
651 assert_param(IS_USART_WAKEUP(USART_WakeUp));
\r
653 USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);
\r
654 USARTx->CR1 |= USART_WakeUp;
\r
661 /** @defgroup USART_Group4 LIN mode functions
\r
662 * @brief LIN mode functions
\r
665 ===============================================================================
\r
666 ##### LIN mode functions #####
\r
667 ===============================================================================
\r
668 [..] This subsection provides a set of functions allowing to manage the USART
\r
669 LIN Mode communication.
\r
670 [..] In LIN mode, 8-bit data format with 1 stop bit is required in accordance
\r
671 with the LIN standard.
\r
672 [..] Only this LIN Feature is supported by the USART IP:
\r
673 (+) LIN Master Synchronous Break send capability and LIN slave break
\r
674 detection capability : 13-bit break generation and 10/11 bit break
\r
676 [..] USART LIN Master transmitter communication is possible through the
\r
677 following procedure:
\r
678 (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
\r
679 Mode transmitter or Mode receiver and hardware flow control values
\r
680 using the USART_Init() function.
\r
681 (#) Enable the USART using the USART_Cmd() function.
\r
682 (#) Enable the LIN mode using the USART_LINCmd() function.
\r
683 (#) Send the break character using USART_SendBreak() function.
\r
684 [..] USART LIN Master receiver communication is possible through the
\r
685 following procedure:
\r
686 (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
\r
687 Mode transmitter or Mode receiver and hardware flow control values
\r
688 using the USART_Init() function.
\r
689 (#) Enable the USART using the USART_Cmd() function.
\r
690 (#) Configures the break detection length
\r
691 using the USART_LINBreakDetectLengthConfig() function.
\r
692 (#) Enable the LIN mode using the USART_LINCmd() function.
\r
693 -@- In LIN mode, the following bits must be kept cleared:
\r
694 (+@) CLKEN in the USART_CR2 register.
\r
695 (+@) STOP[1:0], SCEN, HDSEL and IREN in the USART_CR3 register.
\r
702 * @brief Sets the USART LIN Break detection length.
\r
703 * @param USARTx: Select the USART peripheral.
\r
704 * This parameter can be one of the following values:
\r
705 * USART1, USART2, USART3, UART4 or UART5.
\r
706 * @param USART_LINBreakDetectLength: specifies the LIN break detection length.
\r
707 * This parameter can be one of the following values:
\r
708 * @arg USART_LINBreakDetectLength_10b: 10-bit break detection.
\r
709 * @arg USART_LINBreakDetectLength_11b: 11-bit break detection.
\r
712 void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)
\r
714 /* Check the parameters */
\r
715 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
716 assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
\r
718 USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);
\r
719 USARTx->CR2 |= USART_LINBreakDetectLength;
\r
723 * @brief Enables or disables the USART's LIN mode.
\r
724 * @param USARTx: Select the USART peripheral.
\r
725 * This parameter can be one of the following values:
\r
726 * USART1, USART2, USART3, UART4 or UART5.
\r
727 * @param NewState: new state of the USART LIN mode.
\r
728 * This parameter can be: ENABLE or DISABLE.
\r
731 void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
733 /* Check the parameters */
\r
734 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
735 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
737 if (NewState != DISABLE)
\r
739 /* Enable the LIN mode by setting the LINEN bit in the CR2 register */
\r
740 USARTx->CR2 |= USART_CR2_LINEN;
\r
744 /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
\r
745 USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);
\r
750 * @brief Transmits break characters.
\r
751 * @param USARTx: Select the USART peripheral.
\r
752 * This parameter can be one of the following values:
\r
753 * USART1, USART2, USART3, UART4 or UART5.
\r
756 void USART_SendBreak(USART_TypeDef* USARTx)
\r
758 /* Check the parameters */
\r
759 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
761 /* Send break characters */
\r
762 USARTx->CR1 |= USART_CR1_SBK;
\r
769 /** @defgroup USART_Group5 Halfduplex mode function
\r
770 * @brief Half-duplex mode function
\r
773 ===============================================================================
\r
774 ##### Half-duplex mode function #####
\r
775 ===============================================================================
\r
776 [..] This subsection provides a set of functions allowing to manage the USART
\r
777 Half-duplex communication.
\r
778 [..] The USART can be configured to follow a single-wire half-duplex protocol
\r
779 where the TX and RX lines are internally connected.
\r
780 [..] USART Half duplex communication is possible through the following procedure:
\r
781 (#) Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter
\r
782 or Mode receiver and hardware flow control values using the USART_Init()
\r
784 (#) Configures the USART address using the USART_SetAddress() function.
\r
785 (#) Enable the USART using the USART_Cmd() function.
\r
786 (#) Enable the half duplex mode using USART_HalfDuplexCmd() function.
\r
787 -@- The RX pin is no longer used.
\r
788 -@- In Half-duplex mode the following bits must be kept cleared:
\r
789 (+@) LINEN and CLKEN bits in the USART_CR2 register.
\r
790 (+@) SCEN and IREN bits in the USART_CR3 register.
\r
797 * @brief Enables or disables the USART's Half Duplex communication.
\r
798 * @param USARTx: Select the USART peripheral.
\r
799 * This parameter can be one of the following values:
\r
800 * USART1, USART2, USART3, UART4 or UART5.
\r
801 * @param NewState: new state of the USART Communication.
\r
802 * This parameter can be: ENABLE or DISABLE.
\r
805 void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
807 /* Check the parameters */
\r
808 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
809 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
811 if (NewState != DISABLE)
\r
813 /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
\r
814 USARTx->CR3 |= USART_CR3_HDSEL;
\r
818 /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
\r
819 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);
\r
828 /** @defgroup USART_Group6 Smartcard mode functions
\r
829 * @brief Smartcard mode functions
\r
832 ===============================================================================
\r
833 ##### Smartcard mode functions #####
\r
834 ===============================================================================
\r
835 [..] This subsection provides a set of functions allowing to manage the USART
\r
836 Smartcard communication.
\r
837 [..] The Smartcard interface is designed to support asynchronous protocol
\r
838 Smartcards as defined in the ISO 7816-3 standard. The USART can provide
\r
839 a clock to the smartcard through the SCLK output. In smartcard mode,
\r
840 SCLK is not associated to the communication but is simply derived from
\r
841 the internal peripheral input clock through a 5-bit prescaler.
\r
842 [..] Smartcard communication is possible through the following procedure:
\r
843 (#) Configures the Smartcard Prsecaler using the USART_SetPrescaler()
\r
845 (#) Configures the Smartcard Guard Time using the USART_SetGuardTime()
\r
847 (#) Program the USART clock using the USART_ClockInit() function as following:
\r
848 (++) USART Clock enabled.
\r
849 (++) USART CPOL Low.
\r
850 (++) USART CPHA on first edge.
\r
851 (++) USART Last Bit Clock Enabled.
\r
852 (#) Program the Smartcard interface using the USART_Init() function as
\r
854 (++) Word Length = 9 Bits.
\r
857 (++) BaudRate = 12096 baud.
\r
858 (++) Hardware flow control disabled (RTS and CTS signals).
\r
859 (++) Tx and Rx enabled
\r
860 (#) Optionally you can enable the parity error interrupt using
\r
861 the USART_ITConfig() function.
\r
862 (#) Enable the USART using the USART_Cmd() function.
\r
863 (#) Enable the Smartcard NACK using the USART_SmartCardNACKCmd() function.
\r
864 (#) Enable the Smartcard interface using the USART_SmartCardCmd() function.
\r
866 Please refer to the ISO 7816-3 specification for more details.
\r
868 (@) It is also possible to choose 0.5 stop bit for receiving but it is
\r
869 recommended to use 1.5 stop bits for both transmitting and receiving
\r
870 to avoid switching between the two configurations.
\r
871 (@) In smartcard mode, the following bits must be kept cleared:
\r
872 (+@) LINEN bit in the USART_CR2 register.
\r
873 (+@) HDSEL and IREN bits in the USART_CR3 register.
\r
880 * @brief Sets the specified USART guard time.
\r
881 * @param USARTx: Select the USART peripheral.
\r
882 * This parameter can be one of the following values:
\r
883 * USART1, USART2 or USART3.
\r
884 * @param USART_GuardTime: specifies the guard time.
\r
887 void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)
\r
889 /* Check the parameters */
\r
890 assert_param(IS_USART_123_PERIPH(USARTx));
\r
892 /* Clear the USART Guard time */
\r
893 USARTx->GTPR &= USART_GTPR_PSC;
\r
894 /* Set the USART guard time */
\r
895 USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
\r
899 * @brief Enables or disables the USART's Smart Card mode.
\r
900 * @param USARTx: Select the USART peripheral.
\r
901 * This parameter can be one of the following values:
\r
902 * USART1, USART2 or USART3.
\r
903 * @param NewState: new state of the Smart Card mode.
\r
904 * This parameter can be: ENABLE or DISABLE.
\r
907 void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
909 /* Check the parameters */
\r
910 assert_param(IS_USART_123_PERIPH(USARTx));
\r
911 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
912 if (NewState != DISABLE)
\r
914 /* Enable the SC mode by setting the SCEN bit in the CR3 register */
\r
915 USARTx->CR3 |= USART_CR3_SCEN;
\r
919 /* Disable the SC mode by clearing the SCEN bit in the CR3 register */
\r
920 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);
\r
925 * @brief Enables or disables NACK transmission.
\r
926 * @param USARTx: Select the USART peripheral.
\r
927 * This parameter can be one of the following values:
\r
928 * USART1, USART2 or USART3.
\r
929 * @param NewState: new state of the NACK transmission.
\r
930 * This parameter can be: ENABLE or DISABLE.
\r
933 void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
935 /* Check the parameters */
\r
936 assert_param(IS_USART_123_PERIPH(USARTx));
\r
937 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
938 if (NewState != DISABLE)
\r
940 /* Enable the NACK transmission by setting the NACK bit in the CR3 register */
\r
941 USARTx->CR3 |= USART_CR3_NACK;
\r
945 /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
\r
946 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);
\r
954 /** @defgroup USART_Group7 IrDA mode functions
\r
955 * @brief IrDA mode functions
\r
958 ===============================================================================
\r
959 ##### IrDA mode functions #####
\r
960 ===============================================================================
\r
961 [..] This subsection provides a set of functions allowing to manage the USART
\r
962 IrDA communication.
\r
963 [..] IrDA is a half duplex communication protocol. If the Transmitter is busy,
\r
964 any data on the IrDA receive line will be ignored by the IrDA decoder
\r
965 and if the Receiver is busy, data on the TX from the USART to IrDA will
\r
966 not be encoded by IrDA. While receiving data, transmission should be
\r
967 avoided as the data to be transmitted could be corrupted.
\r
969 [..] IrDA communication is possible through the following procedure:
\r
970 (#) Program the Baud rate, Word length = 8 bits, Stop bits, Parity,
\r
971 Transmitter/Receiver modes and hardware flow control values using
\r
972 the USART_Init() function.
\r
973 (#) Enable the USART using the USART_Cmd() function.
\r
974 (#) Configures the IrDA pulse width by configuring the prescaler using
\r
975 the USART_SetPrescaler() function.
\r
976 (#) Configures the IrDA USART_IrDAMode_LowPower or USART_IrDAMode_Normal
\r
977 mode using the USART_IrDAConfig() function.
\r
978 (#) Enable the IrDA using the USART_IrDACmd() function.
\r
981 (@) A pulse of width less than two and greater than one PSC period(s) may or
\r
982 may not be rejected.
\r
983 (@) The receiver set up time should be managed by software. The IrDA physical
\r
984 layer specification specifies a minimum of 10 ms delay between
\r
985 transmission and reception (IrDA is a half duplex protocol).
\r
986 (@) In IrDA mode, the following bits must be kept cleared:
\r
987 (+@) LINEN, STOP and CLKEN bits in the USART_CR2 register.
\r
988 (+@) SCEN and HDSEL bits in the USART_CR3 register.
\r
995 * @brief Configures the USART's IrDA interface.
\r
996 * @param USARTx: Select the USART peripheral.
\r
997 * This parameter can be one of the following values:
\r
998 * USART1, USART2, USART3, UART4 or UART5.
\r
999 * @param USART_IrDAMode: specifies the IrDA mode.
\r
1000 * This parameter can be one of the following values:
\r
1001 * @arg USART_IrDAMode_LowPower: USART IrDA Low Power mode selected.
\r
1002 * @arg USART_IrDAMode_Normal: USART IrDA Normal mode selected.
\r
1005 void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)
\r
1007 /* Check the parameters */
\r
1008 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
1009 assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
\r
1011 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);
\r
1012 USARTx->CR3 |= USART_IrDAMode;
\r
1016 * @brief Enables or disables the USART's IrDA interface.
\r
1017 * @param USARTx: Select the USART peripheral.
\r
1018 * This parameter can be one of the following values:
\r
1019 * USART1, USART2, USART3, UART4 or UART5.
\r
1020 * @param NewState: new state of the IrDA mode.
\r
1021 * This parameter can be: ENABLE or DISABLE.
\r
1024 void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
\r
1026 /* Check the parameters */
\r
1027 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
1028 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
1030 if (NewState != DISABLE)
\r
1032 /* Enable the IrDA mode by setting the IREN bit in the CR3 register */
\r
1033 USARTx->CR3 |= USART_CR3_IREN;
\r
1037 /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
\r
1038 USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);
\r
1046 /** @defgroup USART_Group8 DMA transfers management functions
\r
1047 * @brief DMA transfers management functions
\r
1050 ===============================================================================
\r
1051 ##### DMA transfers management functions #####
\r
1052 ===============================================================================
\r
1059 * @brief Enables or disables the USART's DMA interface.
\r
1060 * @param USARTx: Select the USART peripheral.
\r
1061 * This parameter can be one of the following values:
\r
1062 * USART1, USART2, USART3, UART4 or UART5.
\r
1063 * @param USART_DMAReq: specifies the DMA request.
\r
1064 * This parameter can be any combination of the following values:
\r
1065 * @arg USART_DMAReq_Tx: USART DMA transmit request.
\r
1066 * @arg USART_DMAReq_Rx: USART DMA receive request.
\r
1067 * @param NewState: new state of the DMA Request sources.
\r
1068 * This parameter can be: ENABLE or DISABLE.
\r
1071 void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
\r
1073 /* Check the parameters */
\r
1074 assert_param(IS_USART_ALL_PERIPH(USARTx));
\r
1075 assert_param(IS_USART_DMAREQ(USART_DMAReq));
\r
1076 assert_param(IS_FUNCTIONAL_STATE(NewState));
\r
1078 if (NewState != DISABLE)
\r
1080 /* Enable the DMA transfer for selected requests by setting the DMAT and/or
\r
1081 DMAR bits in the USART CR3 register */
\r
1082 USARTx->CR3 |= USART_DMAReq;
\r
1086 /* Disable the DMA transfer for selected requests by clearing the DMAT and/or
\r
1087 DMAR bits in the USART CR3 register */
\r
1088 USARTx->CR3 &= (uint16_t)~USART_DMAReq;
\r
1096 /** @defgroup USART_Group9 Interrupts and flags management functions
\r
1097 * @brief Interrupts and flags management functions
\r
1100 ===============================================================================
\r
1101 ##### Interrupts and flags management functions #####
\r
1102 ===============================================================================
\r
1103 [..] This subsection provides a set of functions allowing to configure the
\r
1104 USART Interrupts sources, DMA channels requests and check or clear the
\r
1105 flags or pending bits status. The user should identify which mode will
\r
1106 be used in his application to manage the communication: Polling mode,
\r
1107 Interrupt mode or DMA mode.
\r
1108 *** Polling Mode ***
\r
1109 ====================
\r
1110 [..] In Polling Mode, the SPI communication can be managed by 10 flags:
\r
1111 (#) USART_FLAG_TXE: to indicate the status of the transmit buffer register.
\r
1112 (#) USART_FLAG_RXNE: to indicate the status of the receive buffer register.
\r
1113 (#) USART_FLAG_TC: to indicate the status of the transmit operation.
\r
1114 (#) USART_FLAG_IDLE: to indicate the status of the Idle Line.
\r
1115 (#) USART_FLAG_CTS: to indicate the status of the nCTS input.
\r
1116 (#) USART_FLAG_LBD: to indicate the status of the LIN break detection.
\r
1117 (#) USART_FLAG_NE: to indicate if a noise error occur.
\r
1118 (#) USART_FLAG_FE: to indicate if a frame error occur.
\r
1119 (#) USART_FLAG_PE: to indicate if a parity error occur.
\r
1120 (#) USART_FLAG_ORE: to indicate if an Overrun error occur.
\r
1121 [..] In this Mode it is advised to use the following functions:
\r
1122 (+) FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG).
\r
1123 (+) void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG).
\r
1125 *** Interrupt Mode ***
\r
1126 ======================
\r
1127 [..] In Interrupt Mode, the USART communication can be managed by 8 interrupt
\r
1128 sources and 10 pending bits:
\r
1130 (##) USART_IT_TXE: to indicate the status of the transmit buffer
\r
1132 (##) USART_IT_RXNE: to indicate the status of the receive buffer
\r
1134 (##) USART_IT_TC: to indicate the status of the transmit operation.
\r
1135 (##) USART_IT_IDLE: to indicate the status of the Idle Line.
\r
1136 (##) USART_IT_CTS: to indicate the status of the nCTS input.
\r
1137 (##) USART_IT_LBD: to indicate the status of the LIN break detection.
\r
1138 (##) USART_IT_NE: to indicate if a noise error occur.
\r
1139 (##) USART_IT_FE: to indicate if a frame error occur.
\r
1140 (##) USART_IT_PE: to indicate if a parity error occur.
\r
1141 (##) USART_IT_ORE: to indicate if an Overrun error occur
\r
1142 (if the RXNEIE or EIE bits are set).
\r
1144 (+) Interrupt Source:
\r
1145 (##) USART_IT_TXE: specifies the interrupt source for the Tx buffer
\r
1147 (##) USART_IT_RXNE: specifies the interrupt source for the Rx buffer
\r
1148 not empty interrupt.
\r
1149 (##) USART_IT_TC: specifies the interrupt source for the Transmit
\r
1150 complete interrupt.
\r
1151 (##) USART_IT_IDLE: specifies the interrupt source for the Idle Line
\r
1153 (##) USART_IT_CTS: specifies the interrupt source for the CTS interrupt.
\r
1154 (##) USART_IT_LBD: specifies the interrupt source for the LIN break
\r
1155 detection interrupt.
\r
1156 (##) USART_IT_PE: specifies the interrupt source for theparity error
\r
1158 (##) USART_IT_ERR: specifies the interrupt source for the errors
\r
1160 -@@- Some parameters are coded in order to use them as interrupt
\r
1161 source or as pending bits.
\r
1162 [..] In this Mode it is advised to use the following functions:
\r
1163 (+) void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT,
\r
1164 FunctionalState NewState).
\r
1165 (+) ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT).
\r
1166 (+) void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT).
\r
1170 [..] In DMA Mode, the USART communication can be managed by 2 DMA Channel
\r
1172 (#) USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request.
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1173 (#) USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request.
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1174 [..] In this Mode it is advised to use the following function:
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1175 (+) void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq,
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1176 FunctionalState NewState).
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1182 * @brief Enables or disables the specified USART interrupts.
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1183 * @param USARTx: Select the USART peripheral.
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1184 * This parameter can be one of the following values:
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1185 * USART1, USART2, USART3, UART4 or UART5.
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1186 * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.
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1187 * This parameter can be one of the following values:
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1188 * @arg USART_IT_CTS: CTS change interrupt.
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1189 * @arg USART_IT_LBD: LIN Break detection interrupt.
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1190 * @arg USART_IT_TXE: Tansmit Data Register empty interrupt.
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1191 * @arg USART_IT_TC: Transmission complete interrupt.
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1192 * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
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1193 * @arg USART_IT_IDLE: Idle line detection interrupt.
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1194 * @arg USART_IT_PE: Parity Error interrupt.
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1195 * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error).
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1196 * @param NewState: new state of the specified USARTx interrupts.
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1197 * This parameter can be: ENABLE or DISABLE.
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1200 void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)
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1202 uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
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1203 uint32_t usartxbase = 0x00;
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1204 /* Check the parameters */
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1205 assert_param(IS_USART_ALL_PERIPH(USARTx));
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1206 assert_param(IS_USART_CONFIG_IT(USART_IT));
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1207 assert_param(IS_FUNCTIONAL_STATE(NewState));
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1209 /* The CTS interrupt is not available for UART4 and UART5 */
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1210 if (USART_IT == USART_IT_CTS)
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1212 assert_param(IS_USART_123_PERIPH(USARTx));
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1215 usartxbase = (uint32_t)USARTx;
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1217 /* Get the USART register index */
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1218 usartreg = (((uint8_t)USART_IT) >> 0x05);
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1220 /* Get the interrupt position */
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1221 itpos = USART_IT & IT_MASK;
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1222 itmask = (((uint32_t)0x01) << itpos);
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1224 if (usartreg == 0x01) /* The IT is in CR1 register */
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1226 usartxbase += 0x0C;
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1228 else if (usartreg == 0x02) /* The IT is in CR2 register */
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1230 usartxbase += 0x10;
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1232 else /* The IT is in CR3 register */
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1234 usartxbase += 0x14;
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1236 if (NewState != DISABLE)
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1238 *(__IO uint32_t*)usartxbase |= itmask;
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1242 *(__IO uint32_t*)usartxbase &= ~itmask;
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1247 * @brief Checks whether the specified USART flag is set or not.
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1248 * @param USARTx: Select the USART peripheral.
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1249 * This parameter can be one of the following values:
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1250 * USART1, USART2, USART3, UART4 or UART5.
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1251 * @param USART_FLAG: specifies the flag to check.
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1252 * This parameter can be one of the following values:
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1253 * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5).
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1254 * @arg USART_FLAG_LBD: LIN Break detection flag.
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1255 * @arg USART_FLAG_TXE: Transmit data register empty flag.
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1256 * @arg USART_FLAG_TC: Transmission Complete flag.
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1257 * @arg USART_FLAG_RXNE: Receive data register not empty flag.
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1258 * @arg USART_FLAG_IDLE: Idle Line detection flag.
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1259 * @arg USART_FLAG_ORE: OverRun Error flag.
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1260 * @arg USART_FLAG_NE: Noise Error flag.
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1261 * @arg USART_FLAG_FE: Framing Error flag.
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1262 * @arg USART_FLAG_PE: Parity Error flag.
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1263 * @retval The new state of USART_FLAG (SET or RESET).
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1265 FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)
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1267 FlagStatus bitstatus = RESET;
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1268 /* Check the parameters */
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1269 assert_param(IS_USART_ALL_PERIPH(USARTx));
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1270 assert_param(IS_USART_FLAG(USART_FLAG));
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1272 /* The CTS flag is not available for UART4 and UART5 */
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1273 if (USART_FLAG == USART_FLAG_CTS)
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1275 assert_param(IS_USART_123_PERIPH(USARTx));
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1278 if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)
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1284 bitstatus = RESET;
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1290 * @brief Clears the USARTx's pending flags.
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1291 * @param USARTx: Select the USART peripheral.
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1292 * This parameter can be one of the following values:
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1293 * USART1, USART2, USART3, UART4 or UART5.
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1294 * @param USART_FLAG: specifies the flag to clear.
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1295 * This parameter can be any combination of the following values:
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1296 * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5).
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1297 * @arg USART_FLAG_LBD: LIN Break detection flag.
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1298 * @arg USART_FLAG_TC: Transmission Complete flag.
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1299 * @arg USART_FLAG_RXNE: Receive data register not empty flag.
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1302 * @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
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1303 * error) and IDLE (Idle line detected) flags are cleared by software
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1304 * sequence: a read operation to USART_SR register (USART_GetFlagStatus())
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1305 * followed by a read operation to USART_DR register (USART_ReceiveData()).
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1306 * @note RXNE flag can be also cleared by a read to the USART_DR register
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1307 * (USART_ReceiveData()).
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1308 * @note TC flag can be also cleared by software sequence: a read operation to
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1309 * USART_SR register (USART_GetFlagStatus()) followed by a write operation
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1310 * to USART_DR register (USART_SendData()).
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1311 * @note TXE flag is cleared only by a write to the USART_DR register
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1312 * (USART_SendData()).
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1315 void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)
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1317 /* Check the parameters */
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1318 assert_param(IS_USART_ALL_PERIPH(USARTx));
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1319 assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
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1321 /* The CTS flag is not available for UART4 and UART5 */
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1322 if ((USART_FLAG & USART_FLAG_CTS) == USART_FLAG_CTS)
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1324 assert_param(IS_USART_123_PERIPH(USARTx));
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1327 USARTx->SR = (uint16_t)~USART_FLAG;
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1331 * @brief Checks whether the specified USART interrupt has occurred or not.
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1332 * @param USARTx: Select the USART peripheral.
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1333 * This parameter can be one of the following values:
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1334 * USART1, USART2, USART3, UART4 or UART5.
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1335 * @param USART_IT: specifies the USART interrupt source to check.
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1336 * This parameter can be one of the following values:
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1337 * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
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1338 * @arg USART_IT_LBD: LIN Break detection interrupt
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1339 * @arg USART_IT_TXE: Tansmit Data Register empty interrupt
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1340 * @arg USART_IT_TC: Transmission complete interrupt
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1341 * @arg USART_IT_RXNE: Receive Data register not empty interrupt
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1342 * @arg USART_IT_IDLE: Idle line detection interrupt
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1343 * @arg USART_IT_ORE_RX: OverRun Error interrupt if the RXNEIE bit is set.
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1344 * @arg USART_IT_ORE_ER: OverRun Error interrupt if the EIE bit is set.
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1345 * @arg USART_IT_NE: Noise Error interrupt
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1346 * @arg USART_IT_FE: Framing Error interrupt
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1347 * @arg USART_IT_PE: Parity Error interrupt
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1348 * @retval The new state of USART_IT (SET or RESET).
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1350 ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)
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1352 uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
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1353 ITStatus bitstatus = RESET;
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1354 /* Check the parameters */
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1355 assert_param(IS_USART_ALL_PERIPH(USARTx));
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1356 assert_param(IS_USART_GET_IT(USART_IT));
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1358 /* The CTS interrupt is not available for UART4 and UART5 */
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1359 if (USART_IT == USART_IT_CTS)
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1361 assert_param(IS_USART_123_PERIPH(USARTx));
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1364 /* Get the USART register index */
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1365 usartreg = (((uint8_t)USART_IT) >> 0x05);
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1366 /* Get the interrupt position */
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1367 itmask = USART_IT & IT_MASK;
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1368 itmask = (uint32_t)0x01 << itmask;
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1370 if (usartreg == 0x01) /* The IT is in CR1 register */
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1372 itmask &= USARTx->CR1;
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1374 else if (usartreg == 0x02) /* The IT is in CR2 register */
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1376 itmask &= USARTx->CR2;
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1378 else /* The IT is in CR3 register */
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1380 itmask &= USARTx->CR3;
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1383 bitpos = USART_IT >> 0x08;
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1384 bitpos = (uint32_t)0x01 << bitpos;
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1385 bitpos &= USARTx->SR;
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1386 if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
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1392 bitstatus = RESET;
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1395 return bitstatus;
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1399 * @brief Clears the USARTx's interrupt pending bits.
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1400 * @param USARTx: Select the USART peripheral.
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1401 * This parameter can be one of the following values:
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1402 * USART1, USART2, USART3, UART4 or UART5.
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1403 * @param USART_IT: specifies the interrupt pending bit to clear.
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1404 * This parameter can be one of the following values:
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1405 * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
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1406 * @arg USART_IT_LBD: LIN Break detection interrupt
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1407 * @arg USART_IT_TC: Transmission complete interrupt.
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1408 * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
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1411 * @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
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1412 * error) and IDLE (Idle line detected) pending bits are cleared by
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1413 * software sequence: a read operation to USART_SR register
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1414 * (USART_GetITStatus()) followed by a read operation to USART_DR register
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1415 * (USART_ReceiveData()).
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1416 * @note RXNE pending bit can be also cleared by a read to the USART_DR register
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1417 * (USART_ReceiveData()).
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1418 * @note TC pending bit can be also cleared by software sequence: a read
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1419 * operation to USART_SR register (USART_GetITStatus()) followed by a write
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1420 * operation to USART_DR register (USART_SendData()).
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1421 * @note TXE pending bit is cleared only by a write to the USART_DR register
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1422 * (USART_SendData()).
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1425 void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)
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1427 uint16_t bitpos = 0x00, itmask = 0x00;
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1428 /* Check the parameters */
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1429 assert_param(IS_USART_ALL_PERIPH(USARTx));
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1430 assert_param(IS_USART_CLEAR_IT(USART_IT));
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1432 /* The CTS interrupt is not available for UART4 and UART5 */
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1433 if (USART_IT == USART_IT_CTS)
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1435 assert_param(IS_USART_123_PERIPH(USARTx));
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1438 bitpos = USART_IT >> 0x08;
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1439 itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
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1440 USARTx->SR = (uint16_t)~itmask;
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1459 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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