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FreeRTOS V5.4.2 - 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 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 for details *
* *
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Please ensure to read the configuration and relevant port sections of the
online documentation. - Documentation, latest information, license and
contact details. - A version that is certified for use in safety
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* 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;
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;
*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 );