2 FreeRTOS V8.1.0 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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67 BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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70 /* Scheduler includes. */
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71 #include "FreeRTOS.h"
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75 /* Library includes. */
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76 #include "stm32f10x_lib.h"
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78 /* Demo application includes. */
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80 /*-----------------------------------------------------------*/
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83 #define serINVALID_QUEUE ( ( QueueHandle_t ) 0 )
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84 #define serNO_BLOCK ( ( TickType_t ) 0 )
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85 #define serTX_BLOCK_TIME ( 40 / portTICK_PERIOD_MS )
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87 /*-----------------------------------------------------------*/
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89 /* The queue used to hold received characters. */
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90 static QueueHandle_t xRxedChars;
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91 static QueueHandle_t xCharsForTx;
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93 /*-----------------------------------------------------------*/
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95 /* UART interrupt handler. */
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96 void vUARTInterruptHandler( void );
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98 /*-----------------------------------------------------------*/
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101 * See the serial2.h header file.
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103 xComPortHandle xSerialPortInitMinimal( unsigned long ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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105 xComPortHandle xReturn;
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106 USART_InitTypeDef USART_InitStructure;
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107 NVIC_InitTypeDef NVIC_InitStructure;
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108 GPIO_InitTypeDef GPIO_InitStructure;
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110 /* Create the queues used to hold Rx/Tx characters. */
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111 xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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112 xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed char ) );
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114 /* If the queue/semaphore was created correctly then setup the serial port
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116 if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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118 /* Enable USART1 clock */
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119 RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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121 /* Configure USART1 Rx (PA10) as input floating */
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122 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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123 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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124 GPIO_Init( GPIOA, &GPIO_InitStructure );
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126 /* Configure USART1 Tx (PA9) as alternate function push-pull */
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127 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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128 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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129 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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130 GPIO_Init( GPIOA, &GPIO_InitStructure );
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132 USART_InitStructure.USART_BaudRate = ulWantedBaud;
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133 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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134 USART_InitStructure.USART_StopBits = USART_StopBits_1;
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135 USART_InitStructure.USART_Parity = USART_Parity_No ;
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136 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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137 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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138 USART_InitStructure.USART_Clock = USART_Clock_Disable;
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139 USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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140 USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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141 USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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143 USART_Init( USART1, &USART_InitStructure );
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145 USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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147 NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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148 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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149 NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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150 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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151 NVIC_Init( &NVIC_InitStructure );
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153 USART_Cmd( USART1, ENABLE );
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157 xReturn = ( xComPortHandle ) 0;
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160 /* This demo file only supports a single port but we have to return
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161 something to comply with the standard demo header file. */
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164 /*-----------------------------------------------------------*/
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166 signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed char *pcRxedChar, TickType_t xBlockTime )
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168 /* The port handle is not required as this driver only supports one port. */
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171 /* Get the next character from the buffer. Return false if no characters
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172 are available, or arrive before xBlockTime expires. */
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173 if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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182 /*-----------------------------------------------------------*/
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184 void vSerialPutString( xComPortHandle pxPort, const signed char * const pcString, unsigned short usStringLength )
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186 signed char *pxNext;
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188 /* A couple of parameters that this port does not use. */
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189 ( void ) usStringLength;
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192 /* NOTE: This implementation does not handle the queue being full as no
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193 block time is used! */
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195 /* The port handle is not required as this driver only supports UART1. */
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198 /* Send each character in the string, one at a time. */
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199 pxNext = ( signed char * ) pcString;
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202 xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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206 /*-----------------------------------------------------------*/
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208 signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed char cOutChar, TickType_t xBlockTime )
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210 signed portBASE_TYPE xReturn;
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212 if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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215 USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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224 /*-----------------------------------------------------------*/
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226 void vSerialClose( xComPortHandle xPort )
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228 /* Not supported as not required by the demo application. */
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230 /*-----------------------------------------------------------*/
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232 void vUARTInterruptHandler( void )
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234 portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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237 if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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239 /* The interrupt was caused by the THR becoming empty. Are there any
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240 more characters to transmit? */
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241 if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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243 /* A character was retrieved from the queue so can be sent to the
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245 USART_SendData( USART1, cChar );
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249 USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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253 if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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255 cChar = USART_ReceiveData( USART1 );
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256 xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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259 portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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