/* | |
FreeRTOS.org V5.0.4 - Copyright (C) 2003-2008 Richard Barry. | |
This file is part of the FreeRTOS.org distribution. | |
FreeRTOS.org 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.org 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.org; 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.org, 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. | |
*************************************************************************** | |
*************************************************************************** | |
* * | |
* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, * | |
* and even write all or part of your application on your behalf. * | |
* See http://www.OpenRTOS.com for details of the services we provide to * | |
* expedite your project. * | |
* * | |
*************************************************************************** | |
*************************************************************************** | |
Please ensure to read the configuration and relevant port sections of the | |
online documentation. | |
http://www.FreeRTOS.org - Documentation, latest information, license and | |
contact details. | |
http://www.SafeRTOS.com - A version that is certified for use in safety | |
critical systems. | |
http://www.OpenRTOS.com - Commercial support, development, porting, | |
licensing and training services. | |
*/ | |
/* BASIC INTERRUPT DRIVEN SERIAL PORT DRIVER for port 1. | |
Note that this driver is written to test the RTOS port and is not intended | |
to represent an optimised solution. */ | |
/* Processor Expert generated includes. */ | |
#include "com0.h" | |
/* Scheduler include files. */ | |
#include "FreeRTOS.h" | |
#include "queue.h" | |
#include "task.h" | |
/* Demo application include files. */ | |
#include "serial.h" | |
/* The queues used to communicate between the task code and the interrupt | |
service routines. */ | |
static xQueueHandle xRxedChars; | |
static xQueueHandle xCharsForTx; | |
/* Interrupt identification bits. */ | |
#define serOVERRUN_INTERRUPT ( 0x08 ) | |
#define serRX_INTERRUPT ( 0x20 ) | |
#define serTX_INTERRUPT ( 0x80 ) | |
/*-----------------------------------------------------------*/ | |
/* | |
* Initialise port for interrupt driven communications. | |
*/ | |
xComPortHandle xSerialPortInitMinimal( unsigned portLONG ulWantedBaud, unsigned portBASE_TYPE uxQueueLength ) | |
{ | |
/* Hardware setup is performed by the Processor Expert generated code. | |
This function just creates the queues used to communicate between the | |
interrupt code and the task code - then sets the required baud rate. */ | |
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); | |
xCharsForTx = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) ); | |
COM0_SetBaudRateMode( ( portCHAR ) ulWantedBaud ); | |
return NULL; | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialGetChar( xComPortHandle pxPort, signed portCHAR *pcRxedChar, portTickType xBlockTime ) | |
{ | |
/* Get the next character from the buffer queue. Return false if no characters | |
are available, or arrive before xBlockTime expires. */ | |
if( xQueueReceive( xRxedChars, pcRxedChar, xBlockTime ) ) | |
{ | |
return pdTRUE; | |
} | |
else | |
{ | |
return pdFALSE; | |
} | |
} | |
/*-----------------------------------------------------------*/ | |
signed portBASE_TYPE xSerialPutChar( xComPortHandle pxPort, signed portCHAR cOutChar, portTickType xBlockTime ) | |
{ | |
/* Place the character in the queue of characters to be transmitted. */ | |
if( xQueueSend( xCharsForTx, &cOutChar, xBlockTime ) != pdPASS ) | |
{ | |
return pdFAIL; | |
} | |
/* Turn on the Tx interrupt so the ISR will remove the character from the | |
queue and send it. This does not need to be in a critical section as | |
if the interrupt has already removed the character the next interrupt | |
will simply turn off the Tx interrupt again. */ | |
SCI0CR2_SCTIE = 1;; | |
return pdPASS; | |
} | |
/*-----------------------------------------------------------*/ | |
void vSerialClose( xComPortHandle xPort ) | |
{ | |
/* Not supported. */ | |
( void ) xPort; | |
} | |
/*-----------------------------------------------------------*/ | |
/* | |
* Interrupt service routine for the serial port. Must be in non-banked | |
* memory. | |
*/ | |
#pragma CODE_SEG __NEAR_SEG NON_BANKED | |
__interrupt void vCOM0_ISR( void ) | |
{ | |
volatile unsigned portCHAR ucByte, ucStatus; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
/* What caused the interrupt? */ | |
ucStatus = SCI0SR1; | |
if( ucStatus & serOVERRUN_INTERRUPT ) | |
{ | |
/* The interrupt was caused by an overrun. Clear the error by reading | |
the data register. */ | |
ucByte = SCI0DRL; | |
} | |
if( ucStatus & serRX_INTERRUPT ) | |
{ | |
/* The interrupt was caused by a character being received. | |
Read the received byte. */ | |
ucByte = SCI0DRL; | |
/* Post the character onto the queue of received characters - noting | |
whether or not this wakes a task. */ | |
xQueueSendFromISR( xRxedChars, ( void * ) &ucByte, &xHigherPriorityTaskWoken ); | |
} | |
if( ( ucStatus & serTX_INTERRUPT ) && ( SCI0CR2_SCTIE ) ) | |
{ | |
/* The interrupt was caused by a character being transmitted. */ | |
if( xQueueReceiveFromISR( xCharsForTx, ( void * ) &ucByte, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
{ | |
/* Clear the SCRF bit. */ | |
SCI0DRL = ucByte; | |
} | |
else | |
{ | |
/* Disable transmit interrupt */ | |
SCI0CR2_SCTIE = 0; | |
} | |
} | |
if( xHigherPriorityTaskWoken ) | |
{ | |
portYIELD(); | |
} | |
} | |
#pragma CODE_SEG DEFAULT | |