2 FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not itcan be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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76 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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79 /* Scheduler includes. */
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80 #include "FreeRTOS.h"
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84 /* Library includes. */
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85 #include "stm32f10x_lib.h"
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87 /* Demo application includes. */
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89 /*-----------------------------------------------------------*/
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92 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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93 #define serNO_BLOCK ( ( portTickType ) 0 )
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94 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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96 /*-----------------------------------------------------------*/
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98 /* The queue used to hold received characters. */
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99 static xQueueHandle xRxedChars;
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100 static xQueueHandle xCharsForTx;
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102 /*-----------------------------------------------------------*/
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104 /* UART interrupt handler. */
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105 void vUARTInterruptHandler( void );
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107 /*-----------------------------------------------------------*/
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110 * See the serial2.h header file.
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112 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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114 xComPortHandle xReturn;
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115 USART_InitTypeDef USART_InitStructure;
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116 NVIC_InitTypeDef NVIC_InitStructure;
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117 GPIO_InitTypeDef GPIO_InitStructure;
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119 /* Create the queues used to hold Rx/Tx characters. */
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120 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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121 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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123 /* If the queue/semaphore was created correctly then setup the serial port
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125 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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127 /* Enable USART1 clock */
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128 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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130 /* Configure USART1 Rx (PA10) as input floating */
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131 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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132 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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133 GPIO_Init( GPIOA, &GPIO_InitStructure );
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135 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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136 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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137 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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138 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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139 GPIO_Init( GPIOA, &GPIO_InitStructure );
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141 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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142 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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143 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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144 USART_InitStructure.USART_Parity = USART_Parity_No ;
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145 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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146 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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147 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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148 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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149 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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150 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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152 USART_Init( USART1, &USART_InitStructure );
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154 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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156 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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157 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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158 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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159 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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160 NVIC_Init( &NVIC_InitStructure );
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162 USART_Cmd( USART1, ENABLE );
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166 xReturn = ( xComPortHandle ) 0;
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169 /* This demo file only supports a single port but we have to return
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170 something to comply with the standard demo header file. */
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173 /*-----------------------------------------------------------*/
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175 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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177 /* The port handle is not required as this driver only supports one port. */
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180 /* Get the next character from the buffer. Return false if no characters
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181 are available, or arrive before xBlockTime expires. */
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182 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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191 /*-----------------------------------------------------------*/
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193 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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195 signed portCHAR *pxNext;
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197 /* A couple of parameters that this port does not use. */
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198 ( void ) usStringLength;
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201 /* NOTE: This implementation does not handle the queue being full as no
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202 block time is used! */
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204 /* The port handle is not required as this driver only supports UART1. */
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207 /* Send each character in the string, one at a time. */
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208 pxNext = ( signed portCHAR * ) pcString;
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211 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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215 /*-----------------------------------------------------------*/
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217 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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219 signed portBASE_TYPE xReturn;
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221 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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224 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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233 /*-----------------------------------------------------------*/
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235 void vSerialClose( xComPortHandle xPort )
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237 /* Not supported as not required by the demo application. */
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239 /*-----------------------------------------------------------*/
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241 void vUARTInterruptHandler( void )
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243 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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246 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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248 /* The interrupt was caused by the THR becoming empty. Are there any
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249 more characters to transmit? */
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250 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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252 /* A character was retrieved from the queue so can be sent to the
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254 USART_SendData( USART1, cChar );
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258 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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262 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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264 cChar = USART_ReceiveData( USART1 );
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265 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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268 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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