2 FreeRTOS V6.1.0 - 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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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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62 #include "comtest2.h"
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64 /* Library includes. */
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65 #include "stm32l152_eval.h"
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67 /* Demo application includes. */
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69 /*-----------------------------------------------------------*/
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72 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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73 #define serNO_BLOCK ( ( portTickType ) 0 )
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74 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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76 /*-----------------------------------------------------------*/
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78 /* The queue used to hold received characters. */
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79 static xQueueHandle xRxedChars;
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80 static xQueueHandle xCharsForTx;
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82 /*-----------------------------------------------------------*/
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85 * See the serial2.h header file.
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87 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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89 USART_InitTypeDef USART_InitStructure;
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90 xComPortHandle xReturn;
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91 NVIC_InitTypeDef NVIC_InitStructure;
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93 /* Create the queues used to hold Rx/Tx characters. */
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94 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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95 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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97 /* If the queue/semaphore was created correctly then setup the serial port
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99 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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101 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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102 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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103 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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104 USART_InitStructure.USART_Parity = USART_Parity_No;
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105 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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106 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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108 /* The Eval board COM2 is being used, which in reality is the STM32
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110 STM_EVAL_COMInit( COM2, &USART_InitStructure );
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112 NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
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113 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY;
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114 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /* Not used as 4 bits are used for the pre-emption priority. */;
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115 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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116 NVIC_Init( &NVIC_InitStructure );
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117 USART_ITConfig( USART3, USART_IT_RXNE, ENABLE );
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121 xReturn = ( xComPortHandle ) 0;
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124 /* This demo file only supports a single port but we have to return
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125 something to comply with the standard demo header file. */
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128 /*-----------------------------------------------------------*/
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130 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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132 /* The port handle is not required as this driver only supports one port. */
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135 /* Get the next character from the buffer. Return false if no characters
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136 are available, or arrive before xBlockTime expires. */
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137 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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146 /*-----------------------------------------------------------*/
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148 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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150 signed portCHAR *pxNext;
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152 /* A couple of parameters that this port does not use. */
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153 ( void ) usStringLength;
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156 /* NOTE: This implementation does not handle the queue being full as no
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157 block time is used! */
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159 /* The port handle is not required as this driver only supports UART1. */
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162 /* Send each character in the string, one at a time. */
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163 pxNext = ( signed portCHAR * ) pcString;
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166 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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170 /*-----------------------------------------------------------*/
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172 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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174 signed portBASE_TYPE xReturn;
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176 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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179 USART_ITConfig( USART3, USART_IT_TXE, ENABLE );
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188 /*-----------------------------------------------------------*/
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190 void vSerialClose( xComPortHandle xPort )
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192 /* Not supported as not required by the demo application. */
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194 /*-----------------------------------------------------------*/
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196 void USART3_IRQHandler( void )
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198 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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201 if( USART_GetITStatus( USART3, USART_IT_TXE ) == SET )
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203 /* The interrupt was caused by the THR becoming empty. Are there any
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204 more characters to transmit? */
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205 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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207 /* A character was retrieved from the queue so can be sent to the
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209 USART_SendData( USART3, cChar );
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213 USART_ITConfig( USART3, USART_IT_TXE, DISABLE );
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217 if( USART_GetITStatus( USART3, USART_IT_RXNE ) == SET )
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219 cChar = USART_ReceiveData( USART3 );
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220 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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223 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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