2 FreeRTOS.org V5.1.2 - Copyright (C) 2003-2009 Richard Barry.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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31 * This is a concise, step by step, 'hands on' guide that describes both *
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32 * general multitasking concepts and FreeRTOS specifics. It presents and *
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33 * explains numerous examples that are written using the FreeRTOS API. *
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34 * Full source code for all the examples is provided in an accompanying *
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37 ***************************************************************************
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38 ***************************************************************************
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40 Please ensure to read the configuration and relevant port sections of the
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41 online documentation.
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43 http://www.FreeRTOS.org - Documentation, latest information, license and
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46 http://www.SafeRTOS.com - A version that is certified for use in safety
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49 http://www.OpenRTOS.com - Commercial support, development, porting,
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50 licensing and training services.
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54 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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57 /* Scheduler includes. */
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58 #include "FreeRTOS.h"
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62 /* Library includes. */
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63 #include "stm32f10x_lib.h"
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65 /* Demo application includes. */
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67 /*-----------------------------------------------------------*/
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70 #define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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71 #define serNO_BLOCK ( ( portTickType ) 0 )
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72 #define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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74 /*-----------------------------------------------------------*/
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76 /* The queue used to hold received characters. */
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77 static xQueueHandle xRxedChars;
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78 static xQueueHandle xCharsForTx;
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80 /*-----------------------------------------------------------*/
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82 /* UART interrupt handler. */
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83 void vUARTInterruptHandler( void );
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85 /*-----------------------------------------------------------*/
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88 * See the serial2.h header file.
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90 xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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92 xComPortHandle xReturn;
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93 USART_InitTypeDef USART_InitStructure;
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94 NVIC_InitTypeDef NVIC_InitStructure;
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95 GPIO_InitTypeDef GPIO_InitStructure;
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97 /* Create the queues used to hold Rx/Tx characters. */
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98 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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99 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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101 /* If the queue/semaphore was created correctly then setup the serial port
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103 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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105 /* Enable USART1 clock */
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106 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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108 /* Configure USART1 Rx (PA10) as input floating */
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109 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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110 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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111 GPIO_Init( GPIOA, &GPIO_InitStructure );
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113 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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114 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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115 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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116 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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117 GPIO_Init( GPIOA, &GPIO_InitStructure );
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119 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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120 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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121 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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122 USART_InitStructure.USART_Parity = USART_Parity_No ;
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123 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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124 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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125 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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126 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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127 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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128 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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130 USART_Init( USART1, &USART_InitStructure );
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132 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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134 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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135 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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136 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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137 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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138 NVIC_Init( &NVIC_InitStructure );
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140 USART_Cmd( USART1, ENABLE );
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144 xReturn = ( xComPortHandle ) 0;
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147 /* This demo file only supports a single port but we have to return
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148 something to comply with the standard demo header file. */
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151 /*-----------------------------------------------------------*/
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153 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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155 /* The port handle is not required as this driver only supports one port. */
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158 /* Get the next character from the buffer. Return false if no characters
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159 are available, or arrive before xBlockTime expires. */
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160 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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169 /*-----------------------------------------------------------*/
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171 void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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173 signed portCHAR *pxNext;
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175 /* A couple of parameters that this port does not use. */
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176 ( void ) usStringLength;
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179 /* NOTE: This implementation does not handle the queue being full as no
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180 block time is used! */
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182 /* The port handle is not required as this driver only supports UART1. */
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185 /* Send each character in the string, one at a time. */
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186 pxNext = ( signed portCHAR * ) pcString;
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189 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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193 /*-----------------------------------------------------------*/
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195 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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197 signed portBASE_TYPE xReturn;
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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 vSerialClose( xComPortHandle xPort )
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215 /* Not supported as not required by the demo application. */
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217 /*-----------------------------------------------------------*/
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219 void vUARTInterruptHandler( void )
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221 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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224 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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226 /* The interrupt was caused by the THR becoming empty. Are there any
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227 more characters to transmit? */
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228 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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230 /* A character was retrieved from the queue so can be sent to the
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232 USART_SendData( USART1, cChar );
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236 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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240 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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242 cChar = USART_ReceiveData( USART1 );
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243 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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246 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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