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FreeRTOS V8.0.1 - Copyright (C) 2014 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 !<<
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>>! outside of the FreeRTOS kernel. !<<
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. Full license text is available from the following
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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, a DOS
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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 QueueHandle_t xRxedChars;
static QueueHandle_t xCharsForTx;
static portBASE_TYPE volatile *pxQueueEmpty;
void vConfigureQueues( QueueHandle_t xQForRx, QueueHandle_t 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 );