More work in progress on NEC port and demo.
Richard Barry
16 years ago
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/*
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FreeRTOS.org V5.1.1 - 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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***************************************************************************
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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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/* Standard includes. */
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#include <stdlib.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 serRX_DATA_PIN ( 0x01 )
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#define serTX_DATA_PIN ( 0x02 )
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#define serCLOCK_Fxx_DIV_8 0x03
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#define serUPWR ( 0x80 )
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#define serUTXE ( 0x40 )
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#define serURXE ( 0x20 )
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#define serUCL ( 0x02 )
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#define serLSB ( 0x10 )
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/* Misc. */
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#define serINVALID_QUEUE ( ( xQueueHandle ) 0 )
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#define serHANDLE ( ( xComPortHandle ) 1 )
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#define serNO_BLOCK ( ( portTickType ) 0 )
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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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void vSerialISR( void );
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static volatile unsigned long ulTxInProgress = pdFALSE;
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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 = serHANDLE;
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extern void ( vUART_ISR )( void );
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const unsigned portLONG ulFuclk = ( configCPU_CLOCK_HZ / 2 ) / 8UL;
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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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/* Set the UART0 Rx and Tx pins to their alternative function. */
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PMC3 |= ( serRX_DATA_PIN | serTX_DATA_PIN );
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PM3 &= ~( serTX_DATA_PIN );
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/* Setup clock for required baud. */
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UD0CTL1 = serCLOCK_Fxx_DIV_8;
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UD0CTL2 = ulFuclk / ( 2 * ulWantedBaud );
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/* Enable, n81. */
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UD0CTL0 = ( serUPWR | serUTXE | serURXE | serUCL | serLSB );
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UD0TIC = 0x07; /* UARTA0 transmit enable interrupt request signal clear, mask release, priority level 7 set */
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UD0RIC = 0x07; /* UARTA0 receive end interrupt request signal clear, mask release, priority level 7 set */
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ulTxInProgress = pdFALSE;
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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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portBASE_TYPE xReturn = pdPASS;
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portENTER_CRITICAL();
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{
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if( ulTxInProgress == pdFALSE )
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{
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UD0TX = cOutChar;
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ulTxInProgress = pdTRUE;
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}
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else
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{
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if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS )
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{
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xReturn = pdFAIL;
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}
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}
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}
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portEXIT_CRITICAL();
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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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//#pragma vector=INTUD0T_vector
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//extern __interrupt void vUARTTxISRWrapper( void );
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//#pragma required=vUARTTxISRWrapper
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void vUARTTxISRHandler( void )
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{
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char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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{
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UD0TX = cChar;
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}
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else
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{
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ulTxInProgress = pdFALSE;
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}
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}
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//#pragma vector=INTUD0R_vector
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//extern __interrupt void vUARTRxISRWrapper( void );
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//#pragma required=vUARTRxISRWrapper
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void vUARTRxISRHandler( void )
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{
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portCHAR cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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cChar = UD0RX;
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xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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}
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@ -0,0 +1,47 @@
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RSEG ICODE:CODE
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EXTERN vUARTRxISRHandler
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EXTERN vUARTTxISRHandler
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PUBLIC vUARTRxISRWrapper
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PUBLIC vUARTTxISRWrapper
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; Wrappers for the serial port interrupt service routines. These 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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vUARTRxISRWrapper:
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portSAVE_CONTEXT ; Save the context of the current task.
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jarl vUARTRxISRHandler, lp ; 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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vUARTTxISRWrapper:
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portSAVE_CONTEXT ; Save the context of the current task.
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jarl vUARTTxISRHandler, lp ; 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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COMMON INTVEC:CODE:ROOT(2)
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ORG 2c0H
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`??vUARTRxISRWrapper??INTVEC 2c0`:
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JR vUARTRxISRWrapper
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COMMON INTVEC:CODE:ROOT(2)
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ORG 2d0H
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`??vUARTTxISRWrapper??INTVEC 2d0`:
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JR vUARTTxISRWrapper
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END
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