/* | |
FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd. | |
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 (version 2) as published by the | |
Free Software Foundation and modified by the FreeRTOS exception. | |
**NOTE** The exception to the GPL is included to allow you to distribute a | |
combined work that includes FreeRTOS without being obliged to provide the | |
source code for proprietary components outside of the FreeRTOS kernel. | |
Alternative commercial license and support terms are also available upon | |
request. See the licensing section of http://www.FreeRTOS.org for full | |
license details. | |
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. | |
*************************************************************************** | |
* * | |
* Looking for a quick start? Then check out the FreeRTOS eBook! * | |
* See http://www.FreeRTOS.org/Documentation for details * | |
* * | |
*************************************************************************** | |
1 tab == 4 spaces! | |
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. | |
*/ | |
/*----------------------------------------------------------- | |
* Components that can be compiled to either ARM or THUMB mode are | |
* contained in serial.c The ISR routines, which can only be compiled | |
* to ARM mode, are contained in this file. | |
*----------------------------------------------------------*/ | |
/* Library includes. */ | |
#include "75x_uart.h" | |
/* Scheduler includes. */ | |
#include "FreeRTOS.h" | |
#include "queue.h" | |
static xQueueHandle xRxedChars; | |
static xQueueHandle xCharsForTx; | |
static portBASE_TYPE volatile *pxQueueEmpty; | |
void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, portBASE_TYPE volatile *pxEmptyFlag ) | |
{ | |
xRxedChars = xQForRx; | |
xCharsForTx = xQForTx; | |
pxQueueEmpty = pxEmptyFlag; | |
} | |
/*-----------------------------------------------------------*/ | |
void vSerialISR( void ) | |
{ | |
signed portCHAR cChar; | |
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE; | |
do | |
{ | |
if( UART0->MIS & UART_IT_Transmit ) | |
{ | |
/* The interrupt was caused by the THR becoming empty. Are there any | |
more characters to transmit? */ | |
if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE ) | |
{ | |
/* A character was retrieved from the queue so can be sent to the | |
THR now. */ | |
UART0->DR = cChar; | |
} | |
else | |
{ | |
*pxQueueEmpty = pdTRUE; | |
} | |
UART_ClearITPendingBit( UART0, UART_IT_Transmit ); | |
} | |
if( UART0->MIS & UART_IT_Receive ) | |
{ | |
/* The interrupt was caused by a character being received. Grab the | |
character from the RHR and place it in the queue of received | |
characters. */ | |
cChar = UART0->DR; | |
xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken ); | |
UART_ClearITPendingBit( UART0, UART_IT_Receive ); | |
} | |
} while( UART0->MIS ); | |
/* If a task was woken by either a character being received or a character | |
being transmitted then we may need to switch to another task. */ | |
portEND_SWITCHING_ISR( xHigherPriorityTaskWoken ); | |
} | |