2 FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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66 INTERRUPT DRIVEN SERIAL PORT DRIVER.
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70 /******************************************************************************
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71 *** NOTE: COM0 == USART1, COM1 == USART2
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72 ******************************************************************************/
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75 /* Scheduler includes. */
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76 #include "FreeRTOS.h"
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81 /* Library includes. */
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82 #include "stm32f10x_lib.h"
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84 /* Driver includes. */
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85 #include "STM32_USART.h"
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86 /*-----------------------------------------------------------*/
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88 /* The number of COM ports that can be controlled at the same time. */
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89 #define serNUM_COM_PORTS ( 2 )
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91 /* Queues are used to hold characters that are waiting to be transmitted. This
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92 constant sets the maximum number of characters that can be contained in such a
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93 queue at any one time. */
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94 #define serTX_QUEUE_LEN ( 100 )
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96 /* Queues are used to hold characters that have been received but not yet
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97 processed. This constant sets the maximum number of characters that can be
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98 contained in such a queue. */
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99 #define serRX_QUEUE_LEN ( 100 )
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101 /* The maximum amount of time that calls to lSerialPutString() should wait for
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102 there to be space to post each character to the queue of characters waiting
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103 transmission. NOTE! This is the time to wait per character - not the time to
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104 wait for the entire string. */
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105 #define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_RATE_MS )
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107 /*-----------------------------------------------------------*/
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109 /* References to the USART peripheral addresses themselves. */
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110 static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
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112 /* Queues used to hold characters waiting to be transmitted - one queue per port. */
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113 static xQueueHandle xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
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115 /* Queues holding received characters - one queue per port. */
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116 static xQueueHandle xRxedChars[ serNUM_COM_PORTS ] = { 0 };
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118 /*-----------------------------------------------------------*/
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120 /* UART interrupt handlers, as named in the vector table. */
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121 void USART1_IRQHandler( void );
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122 void USART2_IRQHandler( void );
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124 /*-----------------------------------------------------------*/
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127 * See header file for parameter descriptions.
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129 long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
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131 long lReturn = pdFAIL;
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132 USART_InitTypeDef USART_InitStructure;
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133 NVIC_InitTypeDef NVIC_InitStructure;
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134 GPIO_InitTypeDef GPIO_InitStructure;
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136 if( ulPort < serNUM_COM_PORTS )
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138 /* The common (not port dependent) part of the initialisation. */
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139 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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140 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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141 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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142 USART_InitStructure.USART_Parity = USART_Parity_No;
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143 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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144 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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145 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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146 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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147 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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150 /* Init the buffer structures with the buffer for the COM port being
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151 initialised, and perform any non-common initialisation necessary. This
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152 does not check to see if the COM port has already been initialised. */
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155 /* Create the queue of chars that are waiting to be sent to COM0. */
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156 xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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158 /* Create the queue used to hold characters received from COM0. */
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159 xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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161 /* Enable COM0 clock - the ST libraries start numbering from UART1. */
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162 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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164 /* Configure USART1 Rx (PA10) as input floating */
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165 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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166 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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167 GPIO_Init( GPIOA, &GPIO_InitStructure );
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169 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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170 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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171 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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172 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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173 GPIO_Init( GPIOA, &GPIO_InitStructure );
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175 USART_Init( USART1, &USART_InitStructure );
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176 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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178 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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179 NVIC_Init( &NVIC_InitStructure );
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181 USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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182 USART_Cmd( USART1, ENABLE );
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184 /* Everything is ok. */
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187 else if( ulPort == 1 )
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189 /* Create the queue of chars that are waiting to be sent to COM1. */
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190 xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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192 /* Create the queue used to hold characters received from COM0. */
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193 xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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195 /* Enable COM0 clock - the ST libraries start numbering from 1. */
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196 RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
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198 /* Configure USART2 Rx (PA3) as input floating */
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199 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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200 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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201 GPIO_Init( GPIOA, &GPIO_InitStructure );
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203 /* Configure USART2 Tx (PA2) as alternate function push-pull */
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204 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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205 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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206 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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207 GPIO_Init( GPIOA, &GPIO_InitStructure );
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209 USART_Init( USART2, &USART_InitStructure );
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210 USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
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212 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
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213 NVIC_Init( &NVIC_InitStructure );
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215 USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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216 USART_Cmd( USART2, ENABLE );
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218 /* Everything is ok. */
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223 /* Nothing to do unless more than two ports are supported. */
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229 /*-----------------------------------------------------------*/
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231 signed long xSerialGetChar( long lPort, signed char *pcRxedChar, portTickType xBlockTime )
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233 long lReturn = pdFAIL;
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235 if( lPort < serNUM_COM_PORTS )
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237 if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
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245 /*-----------------------------------------------------------*/
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247 long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
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252 if( lPort < serNUM_COM_PORTS )
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256 for( ul = 0; ul < ulStringLength; ul++ )
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258 if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
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260 /* Cannot fit any more in the queue. Try turning the Tx on to
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261 clear some space. */
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262 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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263 vTaskDelay( serPUT_STRING_CHAR_DELAY );
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265 /* Go back and try again. */
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270 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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279 /*-----------------------------------------------------------*/
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281 signed long xSerialPutChar( long lPort, signed char cOutChar, portTickType xBlockTime )
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285 if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
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288 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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297 /*-----------------------------------------------------------*/
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299 void USART1_IRQHandler( void )
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301 long xHigherPriorityTaskWoken = pdFALSE;
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304 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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306 /* The interrupt was caused by the THR becoming empty. Are there any
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307 more characters to transmit? */
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308 if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
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310 /* A character was retrieved from the buffer so can be sent to the
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312 USART_SendData( USART1, cChar );
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316 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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320 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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322 cChar = USART_ReceiveData( USART1 );
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323 xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
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326 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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328 /*-----------------------------------------------------------*/
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330 void USART2_IRQHandler( void )
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