2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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68 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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71 /* Scheduler includes. */
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72 #include "FreeRTOS.h"
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76 /* Library includes. */
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77 #include "stm32f10x_lib.h"
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79 /* Demo application includes. */
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81 /*-----------------------------------------------------------*/
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84 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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85 #define serNO_BLOCK ( ( portTickType ) 0 )
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86 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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88 /*-----------------------------------------------------------*/
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90 /* The queue used to hold received characters. */
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91 static xQueueHandle xRxedChars;
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92 static xQueueHandle xCharsForTx;
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94 /*-----------------------------------------------------------*/
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96 /* UART interrupt handler. */
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97 void vUARTInterruptHandler( void );
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99 /*-----------------------------------------------------------*/
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102 * See the serial2.h header file.
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104 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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106 xComPortHandle xReturn;
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107 USART_InitTypeDef USART_InitStructure;
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108 NVIC_InitTypeDef NVIC_InitStructure;
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109 GPIO_InitTypeDef GPIO_InitStructure;
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111 /* Create the queues used to hold Rx/Tx characters. */
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112 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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113 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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115 /* If the queue/semaphore was created correctly then setup the serial port
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117 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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119 /* Enable USART1 clock */
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120 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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122 /* Configure USART1 Rx (PA10) as input floating */
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123 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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124 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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125 GPIO_Init( GPIOA, &GPIO_InitStructure );
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127 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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128 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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129 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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130 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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131 GPIO_Init( GPIOA, &GPIO_InitStructure );
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133 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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134 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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135 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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136 USART_InitStructure.USART_Parity = USART_Parity_No ;
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137 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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138 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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139 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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140 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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141 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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142 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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144 USART_Init( USART1, &USART_InitStructure );
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146 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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148 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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149 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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150 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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151 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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152 NVIC_Init( &NVIC_InitStructure );
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154 USART_Cmd( USART1, ENABLE );
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158 xReturn = ( xComPortHandle ) 0;
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161 /* This demo file only supports a single port but we have to return
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162 something to comply with the standard demo header file. */
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165 /*-----------------------------------------------------------*/
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167 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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169 /* The port handle is not required as this driver only supports one port. */
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172 /* Get the next character from the buffer. Return false if no characters
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173 are available, or arrive before xBlockTime expires. */
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174 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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183 /*-----------------------------------------------------------*/
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185 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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187 signed portCHAR *pxNext;
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189 /* A couple of parameters that this port does not use. */
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190 ( void ) usStringLength;
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193 /* NOTE: This implementation does not handle the queue being full as no
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194 block time is used! */
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196 /* The port handle is not required as this driver only supports UART1. */
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199 /* Send each character in the string, one at a time. */
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200 pxNext = ( signed portCHAR * ) pcString;
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203 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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207 /*-----------------------------------------------------------*/
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209 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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211 signed portBASE_TYPE xReturn;
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213 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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216 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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225 /*-----------------------------------------------------------*/
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227 void vSerialClose( xComPortHandle xPort )
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229 /* Not supported as not required by the demo application. */
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231 /*-----------------------------------------------------------*/
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233 void vUARTInterruptHandler( void )
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235 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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238 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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240 /* The interrupt was caused by the THR becoming empty. Are there any
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241 more characters to transmit? */
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242 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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244 /* A character was retrieved from the queue so can be sent to the
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246 USART_SendData( USART1, cChar );
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250 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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254 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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256 cChar = USART_ReceiveData( USART1 );
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257 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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260 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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