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First version under SVN is V4.0.1

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Richard Barry 2006-05-02 09:39:15 +00:00
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Demo/Cygnal/serial/serial.c Normal file
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/*
FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FreeRTOS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
See http://www.FreeRTOS.org for documentation, latest information, license
and contact details. Please ensure to read the configuration and relevant
port sections of the online documentation.
***************************************************************************
*/
/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER FOR DEMO PURPOSES */
#include <stdlib.h>
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
#include "serial.h"
/* Constants required to setup the serial control register. */
#define ser8_BIT_MODE ( ( unsigned portCHAR ) 0x40 )
#define serRX_ENABLE ( ( unsigned portCHAR ) 0x10 )
/* Constants to setup the timer used to generate the baud rate. */
#define serCLOCK_DIV_48 ( ( unsigned portCHAR ) 0x03 )
#define serUSE_PRESCALED_CLOCK ( ( unsigned portCHAR ) 0x10 )
#define ser8BIT_WITH_RELOAD ( ( unsigned portCHAR ) 0x20 )
#define serSMOD ( ( unsigned portCHAR ) 0x10 )
static xQueueHandle xRxedChars;
static xQueueHandle xCharsForTx;
data static unsigned portBASE_TYPE uxTxEmpty;
/*-----------------------------------------------------------*/
xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength )
{
unsigned portLONG ulReloadValue;
const portFLOAT fBaudConst = ( portFLOAT ) configCPU_CLOCK_HZ * ( portFLOAT ) 2.0;
unsigned portCHAR ucOriginalSFRPage;
portENTER_CRITICAL();
{
ucOriginalSFRPage = SFRPAGE;
SFRPAGE = 0;
uxTxEmpty = pdTRUE;
/* Create the queues used by the com test task. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( portCHAR ) );
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( portCHAR ) );
/* Calculate the baud rate to use timer 1. */
ulReloadValue = ( unsigned portLONG ) ( ( ( portFLOAT ) 256 - ( fBaudConst / ( portFLOAT ) ( 32 * ulWantedBaud ) ) ) + ( portFLOAT ) 0.5 );
/* Set timer one for desired mode of operation. */
TMOD &= 0x08;
TMOD |= ser8BIT_WITH_RELOAD;
SSTA0 |= serSMOD;
/* Set the reload and start values for the time. */
TL1 = ( unsigned portCHAR ) ulReloadValue;
TH1 = ( unsigned portCHAR ) ulReloadValue;
/* Setup the control register for standard n, 8, 1 - variable baud rate. */
SCON = ser8_BIT_MODE | serRX_ENABLE;
/* Enable the serial port interrupts */
ES = 1;
/* Start the timer. */
TR1 = 1;
SFRPAGE = ucOriginalSFRPage;
}
portEXIT_CRITICAL();
/* Unlike some ports, this serial code does not allow for more than one
com port. We therefore don't return a pointer to a port structure and can
instead just return NULL. */
return NULL;
}
/*-----------------------------------------------------------*/
void vSerialISR( void ) interrupt 4
{
portCHAR cChar;
portBASE_TYPE xTaskWokenByRx = pdFALSE, xTaskWokenByTx = pdFALSE;
/* 8051 port interrupt routines MUST be placed within a critical section
if taskYIELD() is used within the ISR! */
portENTER_CRITICAL();
{
if( RI )
{
/* Get the character and post it on the queue of Rxed characters.
If the post causes a task to wake force a context switch as the woken task
may have a higher priority than the task we have interrupted. */
cChar = SBUF;
RI = 0;
if( xQueueSendFromISR( xRxedChars, &cChar, pdFALSE ) )
{
xTaskWokenByRx = ( portBASE_TYPE ) pdTRUE;
}
}
if( TI )
{
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xTaskWokenByTx ) == ( portBASE_TYPE ) pdTRUE )
{
/* Send the next character queued for Tx. */
SBUF = cChar;
}
else
{
/* Queue empty, nothing to send. */
uxTxEmpty = pdTRUE;
}
TI = 0;
}
if( xTaskWokenByRx || xTaskWokenByTx )
{
portYIELD();
}
}
portEXIT_CRITICAL();
}
/*-----------------------------------------------------------*/
portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime )
{
/* There is only one port supported. */
( void ) pxPort;
/* Get the next character from the buffer. Return false if no characters
are available, or arrive before xBlockTime expires. */
if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) )
{
return ( portBASE_TYPE ) pdTRUE;
}
else
{
return ( portBASE_TYPE ) pdFALSE;
}
}
/*-----------------------------------------------------------*/
portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime )
{
portBASE_TYPE xReturn;
/* There is only one port supported. */
( void ) pxPort;
portENTER_CRITICAL();
{
if( uxTxEmpty == pdTRUE )
{
SBUF = cOutChar;
uxTxEmpty = pdFALSE;
xReturn = ( portBASE_TYPE ) pdTRUE;
}
else
{
xReturn = xQueueSend( xCharsForTx, &cOutChar, xBlockTime );
if( xReturn == ( portBASE_TYPE ) pdFALSE )
{
xReturn = ( portBASE_TYPE ) pdTRUE;
}
}
}
portEXIT_CRITICAL();
return xReturn;
}
/*-----------------------------------------------------------*/
void vSerialClose( xComPortHandle xPort )
{
/* Not implemented in this port. */
( void ) xPort;
}
/*-----------------------------------------------------------*/