2 FreeRTOS V8.2.0rc1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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13 >>! NOTE: The modification to the GPL is included to allow you to !<<
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14 >>! distribute a combined work that includes FreeRTOS without being !<<
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15 >>! obliged to provide the source code for proprietary components !<<
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16 >>! outside of the FreeRTOS kernel. !<<
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18 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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19 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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20 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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21 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * Having a problem? Start by reading the FAQ "My application does *
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28 * not run, what could be wrong?". Have you defined configASSERT()? *
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30 * http://www.FreeRTOS.org/FAQHelp.html *
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32 ***************************************************************************
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34 ***************************************************************************
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36 * FreeRTOS provides completely free yet professionally developed, *
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37 * robust, strictly quality controlled, supported, and cross *
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38 * platform software that is more than just the market leader, it *
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39 * is the industry's de facto standard. *
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41 * Help yourself get started quickly while simultaneously helping *
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42 * to support the FreeRTOS project by purchasing a FreeRTOS *
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43 * tutorial book, reference manual, or both: *
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44 * http://www.FreeRTOS.org/Documentation *
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46 ***************************************************************************
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48 ***************************************************************************
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50 * Investing in training allows your team to be as productive as *
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51 * possible as early as possible, lowering your overall development *
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52 * cost, and enabling you to bring a more robust product to market *
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53 * earlier than would otherwise be possible. Richard Barry is both *
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54 * the architect and key author of FreeRTOS, and so also the world's *
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55 * leading authority on what is the world's most popular real time *
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56 * kernel for deeply embedded MCU designs. Obtaining your training *
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57 * from Richard ensures your team will gain directly from his in-depth *
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58 * product knowledge and years of usage experience. Contact Real Time *
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59 * Engineers Ltd to enquire about the FreeRTOS Masterclass, presented *
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60 * by Richard Barry: http://www.FreeRTOS.org/contact
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62 ***************************************************************************
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64 ***************************************************************************
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66 * You are receiving this top quality software for free. Please play *
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67 * fair and reciprocate by reporting any suspected issues and *
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68 * participating in the community forum: *
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69 * http://www.FreeRTOS.org/support *
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73 ***************************************************************************
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75 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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76 license and Real Time Engineers Ltd. contact details.
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78 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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79 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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80 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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82 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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83 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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85 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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86 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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87 licenses offer ticketed support, indemnification and commercial middleware.
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89 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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90 engineered and independently SIL3 certified version for use in safety and
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91 mission critical applications that require provable dependability.
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97 INTERRUPT DRIVEN SERIAL PORT DRIVER.
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101 /******************************************************************************
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102 *** NOTE: COM0 == USART1, COM1 == USART2
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103 ******************************************************************************/
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106 /* Scheduler includes. */
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107 #include "FreeRTOS.h"
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110 #include "semphr.h"
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112 /* Library includes. */
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113 #include "stm32f10x_lib.h"
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115 /* Driver includes. */
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116 #include "STM32_USART.h"
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117 /*-----------------------------------------------------------*/
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119 /* The number of COM ports that can be controlled at the same time. */
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120 #define serNUM_COM_PORTS ( 2 )
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122 /* Queues are used to hold characters that are waiting to be transmitted. This
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123 constant sets the maximum number of characters that can be contained in such a
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124 queue at any one time. */
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125 #define serTX_QUEUE_LEN ( 100 )
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127 /* Queues are used to hold characters that have been received but not yet
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128 processed. This constant sets the maximum number of characters that can be
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129 contained in such a queue. */
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130 #define serRX_QUEUE_LEN ( 100 )
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132 /* The maximum amount of time that calls to lSerialPutString() should wait for
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133 there to be space to post each character to the queue of characters waiting
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134 transmission. NOTE! This is the time to wait per character - not the time to
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135 wait for the entire string. */
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136 #define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_PERIOD_MS )
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138 /*-----------------------------------------------------------*/
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140 /* References to the USART peripheral addresses themselves. */
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141 static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
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143 /* Queues used to hold characters waiting to be transmitted - one queue per port. */
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144 static QueueHandle_t xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
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146 /* Queues holding received characters - one queue per port. */
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147 static QueueHandle_t xRxedChars[ serNUM_COM_PORTS ] = { 0 };
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149 /*-----------------------------------------------------------*/
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151 /* UART interrupt handlers, as named in the vector table. */
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152 void USART1_IRQHandler( void );
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153 void USART2_IRQHandler( void );
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155 /*-----------------------------------------------------------*/
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158 * See header file for parameter descriptions.
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160 long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
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162 long lReturn = pdFAIL;
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163 USART_InitTypeDef USART_InitStructure;
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164 NVIC_InitTypeDef NVIC_InitStructure;
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165 GPIO_InitTypeDef GPIO_InitStructure;
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167 if( ulPort < serNUM_COM_PORTS )
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169 /* The common (not port dependent) part of the initialisation. */
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170 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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171 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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172 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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173 USART_InitStructure.USART_Parity = USART_Parity_No;
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174 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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175 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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176 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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177 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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178 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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181 /* Init the buffer structures with the buffer for the COM port being
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182 initialised, and perform any non-common initialisation necessary. This
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183 does not check to see if the COM port has already been initialised. */
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186 /* Create the queue of chars that are waiting to be sent to COM0. */
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187 xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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189 /* Create the queue used to hold characters received from COM0. */
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190 xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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192 /* Enable COM0 clock - the ST libraries start numbering from UART1. */
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193 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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195 /* Configure USART1 Rx (PA10) as input floating */
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196 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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197 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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198 GPIO_Init( GPIOA, &GPIO_InitStructure );
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200 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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201 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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202 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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203 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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204 GPIO_Init( GPIOA, &GPIO_InitStructure );
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206 USART_Init( USART1, &USART_InitStructure );
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207 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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209 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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210 NVIC_Init( &NVIC_InitStructure );
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212 USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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213 USART_Cmd( USART1, ENABLE );
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215 /* Everything is ok. */
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218 else if( ulPort == 1 )
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220 /* Create the queue of chars that are waiting to be sent to COM1. */
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221 xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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223 /* Create the queue used to hold characters received from COM0. */
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224 xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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226 /* Enable COM0 clock - the ST libraries start numbering from 1. */
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227 RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
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229 /* Configure USART2 Rx (PA3) as input floating */
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230 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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231 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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232 GPIO_Init( GPIOA, &GPIO_InitStructure );
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234 /* Configure USART2 Tx (PA2) as alternate function push-pull */
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235 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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236 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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237 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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238 GPIO_Init( GPIOA, &GPIO_InitStructure );
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240 USART_Init( USART2, &USART_InitStructure );
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241 USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
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243 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
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244 NVIC_Init( &NVIC_InitStructure );
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246 USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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247 USART_Cmd( USART2, ENABLE );
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249 /* Everything is ok. */
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254 /* Nothing to do unless more than two ports are supported. */
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260 /*-----------------------------------------------------------*/
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262 signed long xSerialGetChar( long lPort, signed char *pcRxedChar, TickType_t xBlockTime )
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264 long lReturn = pdFAIL;
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266 if( lPort < serNUM_COM_PORTS )
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268 if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
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276 /*-----------------------------------------------------------*/
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278 long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
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283 if( lPort < serNUM_COM_PORTS )
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287 for( ul = 0; ul < ulStringLength; ul++ )
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289 if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
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291 /* Cannot fit any more in the queue. Try turning the Tx on to
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292 clear some space. */
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293 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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294 vTaskDelay( serPUT_STRING_CHAR_DELAY );
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296 /* Go back and try again. */
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301 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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310 /*-----------------------------------------------------------*/
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312 signed long xSerialPutChar( long lPort, signed char cOutChar, TickType_t xBlockTime )
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316 if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
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319 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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328 /*-----------------------------------------------------------*/
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330 void USART1_IRQHandler( void )
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332 long xHigherPriorityTaskWoken = pdFALSE;
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335 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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337 /* The interrupt was caused by the THR becoming empty. Are there any
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338 more characters to transmit? */
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339 if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
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341 /* A character was retrieved from the buffer so can be sent to the
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343 USART_SendData( USART1, cChar );
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347 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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351 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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353 cChar = USART_ReceiveData( USART1 );
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354 xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
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357 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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359 /*-----------------------------------------------------------*/
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361 void USART2_IRQHandler( void )
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