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/*
FreeRTOS.org V5.1.1 - 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 UART0.
This file contains all the serial port components that must be compiled
to ARM mode. The components that can be compiled to either ARM or THUMB
mode are contained in serial.c.
*/
/* Standard includes. */
#include <stdlib.h>
/* Scheduler includes. */
#include "FreeRTOS.h"
#include "queue.h"
#include "task.h"
/* Demo application includes. */
#include "serial.h"
/*-----------------------------------------------------------*/
/* Constant to access the VIC. */
#define serCLEAR_VIC_INTERRUPT ( ( unsigned portLONG ) 0 )
/* Constants to determine the ISR source. */
#define serSOURCE_THRE ( ( unsigned portCHAR ) 0x02 )
#define serSOURCE_RX_TIMEOUT ( ( unsigned portCHAR ) 0x0c )
#define serSOURCE_ERROR ( ( unsigned portCHAR ) 0x06 )
#define serSOURCE_RX ( ( unsigned portCHAR ) 0x04 )
#define serINTERRUPT_SOURCE_MASK ( ( unsigned portCHAR ) 0x0f )
/* Queues used to hold received characters, and characters waiting to be
transmitted. */
static xQueueHandle xRxedChars;
static xQueueHandle xCharsForTx;
static volatile portLONG lTHREEmpty;
/*-----------------------------------------------------------*/
/*
* The queues are created in serialISR.c as they are used from the ISR.
* Obtain references to the queues and THRE Empty flag.
*/
void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars, xQueueHandle *pxCharsForTx, portLONG volatile **pplTHREEmptyFlag );
/* UART0 interrupt service routine entry point. */
void vUART_ISR_Wrapper( void ) __attribute__ ((naked));
/* UART0 interrupt service routine handler. */
void vUART_ISR_Handler( void );
/*-----------------------------------------------------------*/
void vSerialISRCreateQueues( unsigned portBASE_TYPE uxQueueLength, xQueueHandle *pxRxedChars,
xQueueHandle *pxCharsForTx, portLONG volatile **pplTHREEmptyFlag )
{
/* Create the queues used to hold Rx and Tx characters. */
xRxedChars = xQueueCreate( uxQueueLength, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
xCharsForTx = xQueueCreate( uxQueueLength + 1, ( unsigned portBASE_TYPE ) sizeof( signed portCHAR ) );
/* Pass back a reference to the queues so the serial API file can
post/receive characters. */
*pxRxedChars = xRxedChars;
*pxCharsForTx = xCharsForTx;
/* Initialise the THRE empty flag - and pass back a reference. */
lTHREEmpty = ( portLONG ) pdTRUE;
*pplTHREEmptyFlag = &lTHREEmpty;
}
/*-----------------------------------------------------------*/
void vUART_ISR_Wrapper( void )
{
/* Save the context of the interrupted task. */
portSAVE_CONTEXT();
/* Call the handler. This must be a separate function from the wrapper
to ensure the correct stack frame is set up. */
vUART_ISR_Handler();
/* Restore the context of whichever task is going to run next. */
portRESTORE_CONTEXT();
}
/*-----------------------------------------------------------*/
void vUART_ISR_Handler( void )
{
signed portCHAR cChar;
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
/* What caused the interrupt? */
switch( UART0_IIR & serINTERRUPT_SOURCE_MASK )
{
case serSOURCE_ERROR : /* Not handling this, but clear the interrupt. */
cChar = UART0_LSR;
break;
case serSOURCE_THRE : /* The THRE is empty. If there is another
character in the Tx queue, send it now. */
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
{
UART0_THR = cChar;
}
else
{
/* There are no further characters
queued to send so we can indicate
that the THRE is available. */
lTHREEmpty = pdTRUE;
}
break;
case serSOURCE_RX_TIMEOUT :
case serSOURCE_RX : /* A character was received. Place it in
the queue of received characters. */
cChar = UART0_RBR;
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
break;
default : /* There is nothing to do, leave the ISR. */
break;
}
if( xHigherPriorityTaskWoken )
{
portYIELD_FROM_ISR();
}
/* Clear the ISR in the VIC. */
VICVectAddr = serCLEAR_VIC_INTERRUPT;
}
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