Subversion Repositories openrisc

/*

    FreeRTOS V6.1.1 - Copyright (C) 2011 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 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.

    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: http://www.freertos.org/a00114.html and also obtained

    by writing to Richard Barry, contact details for whom are available on the

    FreeRTOS WEB site.

    1 tab == 4 spaces!

    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.

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    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 char 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 );

}