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Richard Barry
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252
20080212/Demo/ARM7_STR71x_IAR/serial/serial.c
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20080212/Demo/ARM7_STR71x_IAR/serial/serial.c
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/*
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FreeRTOS.org V4.7.1 - Copyright (C) 2003-2008 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org 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.org 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.org; 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.org, 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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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 +++
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Documentation, latest information, license and contact details.
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+++ http://www.SafeRTOS.com +++
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A version that is certified for use in safety critical systems.
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+++ http://www.OpenRTOS.com +++
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Commercial support, development, porting, licensing and training services.
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***************************************************************************
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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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/* Library includes. */
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#include "uart.h"
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#include "gpio.h"
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#include "eic.h"
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "queue.h"
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/* Demo application includes. */
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#include "serial.h"
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#define UART0_Rx_Pin ( 0x0001<< 8 )
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#define UART0_Tx_Pin ( 0x0001<< 9 )
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#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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#define serNO_BLOCK ( ( portTickType ) 0 )
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/* Macros to turn on and off the Tx empty interrupt. */
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#define serINTERRUPT_ON() UART0->IER |= UART_TxHalfEmpty
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#define serINTERRUPT_OFF() UART0->IER &= ~UART_TxHalfEmpty
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/*-----------------------------------------------------------*/
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/* Queues used to hold received characters, and characters waiting to be
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transmitted. */
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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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/*-----------------------------------------------------------*/
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/* Interrupt entry point written in the assembler file serialISR.s79. */
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extern void vSerialISREntry( void );
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/* The interrupt service routine - called from the assembly entry point. */
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__arm void vSerialISR( 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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/* Create the queues used to hold Rx and 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 queues were 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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portENTER_CRITICAL();
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{
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/* Setup the UART port pins. */
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GPIO_Config( GPIO0, UART0_Tx_Pin, GPIO_AF_PP );
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GPIO_Config( GPIO0, UART0_Rx_Pin, GPIO_IN_TRI_CMOS );
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/* Configure the UART. */
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UART_OnOffConfig( UART0, ENABLE );
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UART_FifoConfig( UART0, DISABLE );
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UART_FifoReset( UART0, UART_RxFIFO );
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UART_FifoReset( UART0, UART_TxFIFO );
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UART_LoopBackConfig(UART0, DISABLE );
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UART_Config( UART0, ulWantedBaud, UART_NO_PARITY, UART_1_StopBits, UARTM_8D );
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UART_RxConfig( UART0, ENABLE );
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/* Configure the IEC for the UART interrupts. */
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EIC_IRQChannelPriorityConfig( UART0_IRQChannel, 1 );
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EIC_IRQChannelConfig( UART0_IRQChannel, ENABLE );
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EIC_IRQConfig( ENABLE );
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UART_ItConfig( UART0, UART_RxBufFull, ENABLE );
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}
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portEXIT_CRITICAL();
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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 UART0. */
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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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/* Place the character in the queue of characters to be transmitted. */
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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return pdFAIL;
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}
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/* Turn on the Tx interrupt so the ISR will remove the character from the
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queue and send it. This does not need to be in a critical section as
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if the interrupt has already removed the character the next interrupt
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will simply turn off the Tx interrupt again. */
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serINTERRUPT_ON();
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return pdPASS;
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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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/* Serial port ISR. This can cause a context switch so is not defined as a
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standard ISR using the __irq keyword. Instead a wrapper function is defined
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within serialISR.s79 which in turn calls this function. See the port
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documentation on the FreeRTOS.org website for more information. */
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__arm void vSerialISR( void )
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{
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unsigned portSHORT usStatus;
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signed portCHAR cChar;
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portBASE_TYPE xTaskWokenByTx = pdFALSE, xTaskWokenByPost = pdFALSE;
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/* What caused the interrupt? */
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usStatus = UART_FlagStatus( UART0 );
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if( usStatus & UART_TxHalfEmpty )
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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, &xTaskWokenByTx ) == 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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UART0->TxBUFR = cChar;
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}
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else
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{
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/* Queue empty, nothing to send so turn off the Tx interrupt. */
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serINTERRUPT_OFF();
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}
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}
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if( usStatus & UART_RxBufFull )
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{
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/* The interrupt was caused by a character being received. Grab the
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character from the RHR and place it in the queue of received
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characters. */
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cChar = UART0->RxBUFR;
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xTaskWokenByPost = xQueueSendFromISR( xRxedChars, &cChar, xTaskWokenByPost );
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}
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/* If a task was woken by either a character being received or a character
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being transmitted then we may need to switch to another task. */
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portEND_SWITCHING_ISR( ( xTaskWokenByPost || xTaskWokenByTx ) );
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/* End the interrupt in the EIC. */
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portCLEAR_EIC();
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}
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24
20080212/Demo/ARM7_STR71x_IAR/serial/serialISR.s79
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24
20080212/Demo/ARM7_STR71x_IAR/serial/serialISR.s79
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RSEG ICODE:CODE
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CODE32
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EXTERN vSerialISR
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PUBLIC vSerialISREntry
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; Wrapper for the serial port interrupt service routine. This can cause a
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; context switch so requires an assembly wrapper.
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; Defines the portSAVE_CONTEXT and portRESTORE_CONTEXT macros.
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#include "ISR_Support.h"
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vSerialISREntry:
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portSAVE_CONTEXT ; Save the context of the current task.
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bl vSerialISR ; Call the ISR routine.
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portRESTORE_CONTEXT ; Restore the context of the current task -
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; which may be different to the task that
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; was interrupted.
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END
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