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251 lines
8.4 KiB
C
251 lines
8.4 KiB
C
/*
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FreeRTOS.org V5.0.3 - Copyright (C) 2003-2008 Richard Barry.
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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***************************************************************************
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* *
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* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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* and even write all or part of your application on your behalf. *
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* See http://www.OpenRTOS.com for details of the services we provide to *
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* expedite your project. *
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* *
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***************************************************************************
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***************************************************************************
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR UART0.
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*/
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "queue.h"
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#include "semphr.h"
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/* Library includes. */
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#include "stm32f10x_lib.h"
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/* Demo application includes. */
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#include "serial.h"
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/*-----------------------------------------------------------*/
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/* Misc defines. */
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#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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#define serNO_BLOCK ( ( portTickType ) 0 )
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#define serTX_BLOCK_TIME ( 40 / portTICK_RATE_MS )
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/*-----------------------------------------------------------*/
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/* The queue used to hold received characters. */
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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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/*-----------------------------------------------------------*/
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/* UART interrupt handler. */
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void vUARTInterruptHandler( void );
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/*-----------------------------------------------------------*/
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/*
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* See the serial2.h header file.
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*/
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xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
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{
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xComPortHandle xReturn;
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USART_InitTypeDef USART_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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GPIO_InitTypeDef GPIO_InitStructure;
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/* Create the queues used to hold Rx/Tx characters. */
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xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
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/* If the queue/semaphore was created correctly then setup the serial port
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hardware. */
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if( ( xRxedChars != serINVALID_QUEUE ) && ( xCharsForTx != serINVALID_QUEUE ) )
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{
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/* Enable USART1 clock */
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RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE );
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/* Configure USART1 Rx (PA10) as input floating */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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/* Configure USART1 Tx (PA9) as alternate function push-pull */
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_Init( GPIOA, &GPIO_InitStructure );
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USART_InitStructure.USART_BaudRate = ulWantedBaud;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_Parity = USART_Parity_No ;
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USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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USART_InitStructure.USART_Clock = USART_Clock_Disable;
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USART_InitStructure.USART_CPOL = USART_CPOL_Low;
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USART_InitStructure.USART_CPHA = USART_CPHA_2Edge;
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USART_InitStructure.USART_LastBit = USART_LastBit_Disable;
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USART_Init( USART1, &USART_InitStructure );
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USART_ITConfig( USART1, USART_IT_RXNE, ENABLE );
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_KERNEL_INTERRUPT_PRIORITY;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init( &NVIC_InitStructure );
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USART_Cmd( USART1, ENABLE );
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}
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else
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{
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xReturn = ( xComPortHandle ) 0;
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}
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/* This demo file only supports a single port but we have to return
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something to comply with the standard demo header file. */
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
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{
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/* The port handle is not required as this driver only supports one port. */
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( void ) pxPort;
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/* Get the next character from the buffer. Return false if no characters
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are available, or arrive before xBlockTime expires. */
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if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
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{
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return pdTRUE;
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}
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else
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{
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return pdFALSE;
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}
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}
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/*-----------------------------------------------------------*/
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void vSerialPutString( xComPortHandle pxPort, const signed portCHAR * const pcString, unsigned portSHORT usStringLength )
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{
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signed portCHAR *pxNext;
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/* A couple of parameters that this port does not use. */
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( void ) usStringLength;
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( void ) pxPort;
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/* NOTE: This implementation does not handle the queue being full as no
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block time is used! */
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/* The port handle is not required as this driver only supports UART1. */
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( void ) pxPort;
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/* Send each character in the string, one at a time. */
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pxNext = ( signed portCHAR * ) pcString;
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while( *pxNext )
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{
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xSerialPutChar( pxPort, *pxNext, serNO_BLOCK );
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pxNext++;
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}
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}
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/*-----------------------------------------------------------*/
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signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
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{
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signed portBASE_TYPE xReturn;
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) == pdPASS )
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{
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xReturn = pdPASS;
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USART_ITConfig( USART1, USART_IT_TXE, ENABLE );
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}
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else
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{
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xReturn = pdFAIL;
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}
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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void vSerialClose( xComPortHandle xPort )
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{
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/* Not supported as not required by the demo application. */
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}
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/*-----------------------------------------------------------*/
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void vUARTInterruptHandler( void )
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{
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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portCHAR cChar;
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if( USART_GetITStatus( USART1, USART_IT_TXE ) == SET )
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{
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/* The interrupt was caused by the THR becoming empty. Are there any
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more characters to transmit? */
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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/* A character was retrieved from the queue so can be sent to the
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THR now. */
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USART_SendData( USART1, cChar );
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}
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else
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{
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USART_ITConfig( USART1, USART_IT_TXE, DISABLE );
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}
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}
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if( USART_GetITStatus( USART1, USART_IT_RXNE ) == SET )
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{
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cChar = USART_ReceiveData( USART1 );
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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