2 FreeRTOS V8.2.2 - Copyright (C) 2015 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 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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71 INTERRUPT DRIVEN SERIAL PORT DRIVER.
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75 /******************************************************************************
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76 *** NOTE: COM0 == USART1, COM1 == USART2
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77 ******************************************************************************/
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80 /* Scheduler includes. */
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81 #include "FreeRTOS.h"
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86 /* Library includes. */
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87 #include "stm32f10x_lib.h"
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89 /* Driver includes. */
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90 #include "STM32_USART.h"
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91 /*-----------------------------------------------------------*/
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93 /* The number of COM ports that can be controlled at the same time. */
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94 #define serNUM_COM_PORTS ( 2 )
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96 /* Queues are used to hold characters that are waiting to be transmitted. This
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97 constant sets the maximum number of characters that can be contained in such a
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98 queue at any one time. */
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99 #define serTX_QUEUE_LEN ( 100 )
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101 /* Queues are used to hold characters that have been received but not yet
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102 processed. This constant sets the maximum number of characters that can be
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103 contained in such a queue. */
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104 #define serRX_QUEUE_LEN ( 100 )
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106 /* The maximum amount of time that calls to lSerialPutString() should wait for
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107 there to be space to post each character to the queue of characters waiting
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108 transmission. NOTE! This is the time to wait per character - not the time to
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109 wait for the entire string. */
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110 #define serPUT_STRING_CHAR_DELAY ( 5 / portTICK_PERIOD_MS )
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112 /*-----------------------------------------------------------*/
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114 /* References to the USART peripheral addresses themselves. */
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115 static USART_TypeDef * const xUARTS[ serNUM_COM_PORTS ] = { ( ( USART_TypeDef * ) USART1_BASE ), ( ( USART_TypeDef * ) USART2_BASE ) };
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117 /* Queues used to hold characters waiting to be transmitted - one queue per port. */
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118 static QueueHandle_t xCharsForTx[ serNUM_COM_PORTS ] = { 0 };
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120 /* Queues holding received characters - one queue per port. */
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121 static QueueHandle_t xRxedChars[ serNUM_COM_PORTS ] = { 0 };
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123 /*-----------------------------------------------------------*/
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125 /* UART interrupt handlers, as named in the vector table. */
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126 void USART1_IRQHandler( void );
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127 void USART2_IRQHandler( void );
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129 /*-----------------------------------------------------------*/
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132 * See header file for parameter descriptions.
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134 long lCOMPortInit( unsigned long ulPort, unsigned long ulWantedBaud )
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136 long lReturn = pdFAIL;
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137 USART_InitTypeDef USART_InitStructure;
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138 NVIC_InitTypeDef NVIC_InitStructure;
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139 GPIO_InitTypeDef GPIO_InitStructure;
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141 if( ulPort < serNUM_COM_PORTS )
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143 /* The common (not port dependent) part of the initialisation. */
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144 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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145 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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146 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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147 USART_InitStructure.USART_Parity = USART_Parity_No;
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148 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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149 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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150 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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151 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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152 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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155 /* Init the buffer structures with the buffer for the COM port being
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156 initialised, and perform any non-common initialisation necessary. This
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157 does not check to see if the COM port has already been initialised. */
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160 /* Create the queue of chars that are waiting to be sent to COM0. */
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161 xCharsForTx[ 0 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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163 /* Create the queue used to hold characters received from COM0. */
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164 xRxedChars[ 0 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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166 /* Enable COM0 clock - the ST libraries start numbering from UART1. */
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167 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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169 /* Configure USART1 Rx (PA10) as input floating */
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170 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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171 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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172 GPIO_Init( GPIOA, &GPIO_InitStructure );
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174 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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175 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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176 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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177 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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178 GPIO_Init( GPIOA, &GPIO_InitStructure );
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180 USART_Init( USART1, &USART_InitStructure );
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181 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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183 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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184 NVIC_Init( &NVIC_InitStructure );
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186 USART_DMACmd( USART1, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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187 USART_Cmd( USART1, ENABLE );
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189 /* Everything is ok. */
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192 else if( ulPort == 1 )
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194 /* Create the queue of chars that are waiting to be sent to COM1. */
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195 xCharsForTx[ 1 ] = xQueueCreate( serTX_QUEUE_LEN, sizeof( char ) );
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197 /* Create the queue used to hold characters received from COM0. */
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198 xRxedChars[ 1 ] = xQueueCreate( serRX_QUEUE_LEN, sizeof( char ) );
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200 /* Enable COM0 clock - the ST libraries start numbering from 1. */
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201 RCC_APB2PeriphClockCmd( RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA, ENABLE );
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203 /* Configure USART2 Rx (PA3) as input floating */
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204 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
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205 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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206 GPIO_Init( GPIOA, &GPIO_InitStructure );
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208 /* Configure USART2 Tx (PA2) as alternate function push-pull */
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209 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
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210 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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211 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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212 GPIO_Init( GPIOA, &GPIO_InitStructure );
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214 USART_Init( USART2, &USART_InitStructure );
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215 USART_ITConfig( USART2, USART_IT_RXNE, ENABLE );
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217 NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQChannel;
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218 NVIC_Init( &NVIC_InitStructure );
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220 USART_DMACmd( USART2, ( USART_DMAReq_Tx | USART_DMAReq_Rx ), ENABLE );
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221 USART_Cmd( USART2, ENABLE );
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223 /* Everything is ok. */
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228 /* Nothing to do unless more than two ports are supported. */
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234 /*-----------------------------------------------------------*/
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236 signed long xSerialGetChar( long lPort, signed char *pcRxedChar, TickType_t xBlockTime )
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238 long lReturn = pdFAIL;
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240 if( lPort < serNUM_COM_PORTS )
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242 if( xQueueReceive( xRxedChars[ lPort ], pcRxedChar, xBlockTime ) == pdPASS )
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250 /*-----------------------------------------------------------*/
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252 long lSerialPutString( long lPort, const char * const pcString, unsigned long ulStringLength )
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257 if( lPort < serNUM_COM_PORTS )
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261 for( ul = 0; ul < ulStringLength; ul++ )
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263 if( xQueueSend( xCharsForTx[ lPort ], &( pcString[ ul ] ), serPUT_STRING_CHAR_DELAY ) != pdPASS )
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265 /* Cannot fit any more in the queue. Try turning the Tx on to
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266 clear some space. */
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267 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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268 vTaskDelay( serPUT_STRING_CHAR_DELAY );
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270 /* Go back and try again. */
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275 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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284 /*-----------------------------------------------------------*/
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286 signed long xSerialPutChar( long lPort, signed char cOutChar, TickType_t xBlockTime )
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290 if( xQueueSend( xCharsForTx[ lPort ], &cOutChar, xBlockTime ) == pdPASS )
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293 USART_ITConfig( xUARTS[ lPort ], USART_IT_TXE, ENABLE );
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302 /*-----------------------------------------------------------*/
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304 void USART1_IRQHandler( void )
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306 long xHigherPriorityTaskWoken = pdFALSE;
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309 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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311 /* The interrupt was caused by the THR becoming empty. Are there any
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312 more characters to transmit? */
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313 if( xQueueReceiveFromISR( xCharsForTx[ 0 ], &cChar, &xHigherPriorityTaskWoken ) )
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315 /* A character was retrieved from the buffer so can be sent to the
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317 USART_SendData( USART1, cChar );
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321 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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325 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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327 cChar = USART_ReceiveData( USART1 );
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328 xQueueSendFromISR( xRxedChars[ 0 ], &cChar, &xHigherPriorityTaskWoken );
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331 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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333 /*-----------------------------------------------------------*/
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335 void USART2_IRQHandler( void )
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