2 FreeRTOS V6.0.5 - Copyright (C) 2010 Real Time Engineers Ltd.
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4 ***************************************************************************
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23 ***************************************************************************
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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 exception to the GPL is included to allow you to distribute
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31 a combined work that includes FreeRTOS without being obliged to provide the
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32 source code for proprietary components outside of the FreeRTOS kernel.
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33 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 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 http://www.FreeRTOS.org - Documentation, latest information, license and
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51 licensing and training services.
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55 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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58 /* Scheduler includes. */
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59 #include "FreeRTOS.h"
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63 /* Library includes. */
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64 #include "stm32f10x_lib.h"
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66 /* Demo application includes. */
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68 /*-----------------------------------------------------------*/
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71 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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72 #define serNO_BLOCK ( ( portTickType ) 0 )
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73 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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75 /*-----------------------------------------------------------*/
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77 /* The queue used to hold received characters. */
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78 static xQueueHandle xRxedChars;
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79 static xQueueHandle xCharsForTx;
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81 /*-----------------------------------------------------------*/
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83 /* UART interrupt handler. */
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84 void vUARTInterruptHandler( void );
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86 /*-----------------------------------------------------------*/
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89 * See the serial2.h header file.
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91 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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93 xComPortHandle xReturn;
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94 USART_InitTypeDef USART_InitStructure;
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95 NVIC_InitTypeDef NVIC_InitStructure;
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96 GPIO_InitTypeDef GPIO_InitStructure;
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98 /* Create the queues used to hold Rx/Tx characters. */
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99 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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100 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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102 /* If the queue/semaphore was created correctly then setup the serial port
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104 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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106 /* Enable USART1 clock */
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107 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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109 /* Configure USART1 Rx (PA10) as input floating */
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110 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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111 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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112 GPIO_Init( GPIOA, &GPIO_InitStructure );
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114 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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115 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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116 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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117 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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118 GPIO_Init( GPIOA, &GPIO_InitStructure );
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120 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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121 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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122 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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123 USART_InitStructure.USART_Parity = USART_Parity_No;
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124 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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125 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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127 USART_Init( USART1, &USART_InitStructure );
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129 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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131 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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132 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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133 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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134 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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135 NVIC_Init( &NVIC_InitStructure );
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137 USART_Cmd( USART1, ENABLE );
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141 xReturn = ( xComPortHandle ) 0;
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144 /* This demo file only supports a single port but we have to return
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145 something to comply with the standard demo header file. */
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148 /*-----------------------------------------------------------*/
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150 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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152 /* The port handle is not required as this driver only supports one port. */
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155 /* Get the next character from the buffer. Return false if no characters
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156 are available, or arrive before xBlockTime expires. */
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157 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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166 /*-----------------------------------------------------------*/
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168 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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170 signed portCHAR *pxNext;
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172 /* A couple of parameters that this port does not use. */
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173 ( void ) usStringLength;
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176 /* NOTE: This implementation does not handle the queue being full as no
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177 block time is used! */
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179 /* The port handle is not required as this driver only supports UART1. */
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182 /* Send each character in the string, one at a time. */
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183 pxNext = ( signed portCHAR * ) pcString;
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186 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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190 /*-----------------------------------------------------------*/
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192 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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194 signed portBASE_TYPE xReturn;
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196 /* Just to remove the compiler warning. */
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199 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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202 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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211 /*-----------------------------------------------------------*/
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213 void vUARTInterruptHandler( void )
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215 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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218 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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220 /* The interrupt was caused by the THR becoming empty. Are there any
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221 more characters to transmit? */
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222 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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224 /* A character was retrieved from the queue so can be sent to the
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226 USART_SendData( USART1, cChar );
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230 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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234 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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236 cChar = USART_ReceiveData( USART1 );
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237 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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240 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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