2 FreeRTOS V8.2.3 - 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 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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74 /* Scheduler includes. */
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75 #include "FreeRTOS.h"
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79 /* Library includes. */
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80 #include "stm32f10x_lib.h"
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82 /* Demo application includes. */
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84 /*-----------------------------------------------------------*/
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87 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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88 #define serNO_BLOCK ( ( TickType_t ) 0 )
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89 #define serTX_BLOCK_TIME ( 40 / portTICK_PERIOD_MS )
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91 /*-----------------------------------------------------------*/
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93 /* The queue used to hold received characters. */
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94 static QueueHandle_t xRxedChars;
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95 static QueueHandle_t xCharsForTx;
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97 /*-----------------------------------------------------------*/
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99 /* UART interrupt handler. */
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100 void vUARTInterruptHandler( void );
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102 /*-----------------------------------------------------------*/
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105 * See the serial2.h header file.
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107 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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109 xComPortHandle xReturn;
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110 USART_InitTypeDef USART_InitStructure;
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111 NVIC_InitTypeDef NVIC_InitStructure;
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112 GPIO_InitTypeDef GPIO_InitStructure;
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114 /* Create the queues used to hold Rx/Tx characters. */
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115 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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116 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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118 /* If the queue/semaphore was created correctly then setup the serial port
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120 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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122 /* Enable USART1 clock */
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123 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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125 /* Configure USART1 Rx (PA10) as input floating */
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126 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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127 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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128 GPIO_Init( GPIOA, &GPIO_InitStructure );
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130 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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131 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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132 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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133 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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134 GPIO_Init( GPIOA, &GPIO_InitStructure );
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136 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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137 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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138 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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139 USART_InitStructure.USART_Parity = USART_Parity_No ;
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140 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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141 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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142 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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143 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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144 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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145 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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147 USART_Init( USART1, &USART_InitStructure );
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149 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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151 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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152 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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153 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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154 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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155 NVIC_Init( &NVIC_InitStructure );
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157 USART_Cmd( USART1, ENABLE );
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161 xReturn = ( xComPortHandle ) 0;
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164 /* This demo file only supports a single port but we have to return
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165 something to comply with the standard demo header file. */
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168 /*-----------------------------------------------------------*/
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170 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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172 /* The port handle is not required as this driver only supports one port. */
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175 /* Get the next character from the buffer. Return false if no characters
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176 are available, or arrive before xBlockTime expires. */
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177 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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186 /*-----------------------------------------------------------*/
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188 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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190 signed char *pxNext;
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192 /* A couple of parameters that this port does not use. */
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193 ( void ) usStringLength;
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196 /* NOTE: This implementation does not handle the queue being full as no
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197 block time is used! */
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199 /* The port handle is not required as this driver only supports UART1. */
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202 /* Send each character in the string, one at a time. */
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203 pxNext = ( signed char * ) pcString;
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206 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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210 /*-----------------------------------------------------------*/
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212 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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214 signed portBASE_TYPE xReturn;
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216 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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219 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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228 /*-----------------------------------------------------------*/
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230 void vSerialClose( xComPortHandle xPort )
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232 /* Not supported as not required by the demo application. */
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234 /*-----------------------------------------------------------*/
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236 void vUARTInterruptHandler( void )
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238 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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241 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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243 /* The interrupt was caused by the THR becoming empty. Are there any
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244 more characters to transmit? */
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245 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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247 /* A character was retrieved from the queue so can be sent to the
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249 USART_SendData( USART1, cChar );
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253 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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257 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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259 cChar = USART_ReceiveData( USART1 );
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260 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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263 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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