2 FreeRTOS V7.5.2 - 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 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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69 /* Scheduler includes. */
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70 #include "FreeRTOS.h"
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74 /* Library includes. */
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75 #include "stm32f10x_lib.h"
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77 /* Demo application includes. */
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79 /*-----------------------------------------------------------*/
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82 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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83 #define serNO_BLOCK ( ( portTickType ) 0 )
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84 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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86 /*-----------------------------------------------------------*/
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88 /* The queue used to hold received characters. */
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89 static xQueueHandle xRxedChars;
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90 static xQueueHandle xCharsForTx;
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92 /*-----------------------------------------------------------*/
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94 /* UART interrupt handler. */
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95 void vUARTInterruptHandler( void );
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97 /*-----------------------------------------------------------*/
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100 * See the serial2.h header file.
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102 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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104 xComPortHandle xReturn;
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105 USART_InitTypeDef USART_InitStructure;
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106 NVIC_InitTypeDef NVIC_InitStructure;
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107 GPIO_InitTypeDef GPIO_InitStructure;
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109 /* Create the queues used to hold Rx/Tx characters. */
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110 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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111 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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113 /* If the queue/semaphore was created correctly then setup the serial port
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115 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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117 /* Enable USART1 clock */
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118 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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120 /* Configure USART1 Rx (PA10) as input floating */
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121 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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122 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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123 GPIO_Init( GPIOA, &GPIO_InitStructure );
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125 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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126 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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127 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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128 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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129 GPIO_Init( GPIOA, &GPIO_InitStructure );
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131 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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132 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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133 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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134 USART_InitStructure.USART_Parity = USART_Parity_No ;
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135 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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136 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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137 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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138 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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139 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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140 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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142 USART_Init( USART1, &USART_InitStructure );
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144 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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146 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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147 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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148 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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149 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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150 NVIC_Init( &NVIC_InitStructure );
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152 USART_Cmd( USART1, ENABLE );
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156 xReturn = ( xComPortHandle ) 0;
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159 /* This demo file only supports a single port but we have to return
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160 something to comply with the standard demo header file. */
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163 /*-----------------------------------------------------------*/
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165 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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167 /* The port handle is not required as this driver only supports one port. */
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170 /* Get the next character from the buffer. Return false if no characters
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171 are available, or arrive before xBlockTime expires. */
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172 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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181 /*-----------------------------------------------------------*/
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183 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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185 signed portCHAR *pxNext;
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187 /* A couple of parameters that this port does not use. */
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188 ( void ) usStringLength;
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191 /* NOTE: This implementation does not handle the queue being full as no
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192 block time is used! */
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194 /* The port handle is not required as this driver only supports UART1. */
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197 /* Send each character in the string, one at a time. */
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198 pxNext = ( signed portCHAR * ) pcString;
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201 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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205 /*-----------------------------------------------------------*/
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207 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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209 signed portBASE_TYPE xReturn;
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211 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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214 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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223 /*-----------------------------------------------------------*/
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225 void vSerialClose( xComPortHandle xPort )
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227 /* Not supported as not required by the demo application. */
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229 /*-----------------------------------------------------------*/
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231 void vUARTInterruptHandler( void )
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233 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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236 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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238 /* The interrupt was caused by the THR becoming empty. Are there any
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239 more characters to transmit? */
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240 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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242 /* A character was retrieved from the queue so can be sent to the
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244 USART_SendData( USART1, cChar );
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248 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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252 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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254 cChar = USART_ReceiveData( USART1 );
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255 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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258 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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