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FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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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 modification 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
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
and the FreeRTOS license exception along with FreeRTOS; if not it can be
viewed here: and also obtained by
writing to Real Time Engineers Ltd., contact details for whom are available
on the FreeRTOS WEB site.
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* Having a problem? Start by reading the FAQ "My application does *
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*************************************************************************** - Documentation, books, training, latest versions,
license and Real Time Engineers Ltd. contact details. - A selection of FreeRTOS ecosystem products,
including FreeRTOS+Trace - an indispensable productivity tool, and our new
fully thread aware and reentrant UDP/IP stack. - Real Time Engineers ltd license FreeRTOS to High
Integrity Systems, who sell the code with commercial support,
indemnification and middleware, under the OpenRTOS brand. - High Integrity Systems also provide a safety
engineered and independently SIL3 certified version for use in safety and
mission critical applications that require provable dependability.
* 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 char 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 );