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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_STR75x_GCC/] [serial/] [serialISR.c] - Blame information for rev 583

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1 577 jeremybenn
/*
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    FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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    ***************************************************************************
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    *                                                                         *
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    * If you are:                                                             *
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    *                                                                         *
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    *    + New to FreeRTOS,                                                   *
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    *    + Wanting to learn FreeRTOS or multitasking in general quickly       *
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    *    + Looking for basic training,                                        *
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    *    + Wanting to improve your FreeRTOS skills and productivity           *
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    *                                                                         *
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    * then take a look at the FreeRTOS books - available as PDF or paperback  *
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    *                                                                         *
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    *        "Using the FreeRTOS Real Time Kernel - a Practical Guide"        *
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    *                  http://www.FreeRTOS.org/Documentation                  *
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    *                                                                         *
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    * A pdf reference manual is also available.  Both are usually delivered   *
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    * to your inbox within 20 minutes to two hours when purchased between 8am *
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    * and 8pm GMT (although please allow up to 24 hours in case of            *
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    * exceptional circumstances).  Thank you for your support!                *
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    *                                                                         *
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    ***************************************************************************
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    This file is part of the FreeRTOS distribution.
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    FreeRTOS is free software; you can redistribute it and/or modify it under
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    the terms of the GNU General Public License (version 2) as published by the
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    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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    ***NOTE*** The exception to the GPL is included to allow you to distribute
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    a combined work that includes FreeRTOS without being obliged to provide the
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    source code for proprietary components outside of the FreeRTOS kernel.
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    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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    more details. You should have received a copy of the GNU General Public
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    License and the FreeRTOS license exception along with FreeRTOS; if not it
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    can be viewed here: http://www.freertos.org/a00114.html and also obtained
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    by writing to Richard Barry, contact details for whom are available on the
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    FreeRTOS WEB site.
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    1 tab == 4 spaces!
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    http://www.FreeRTOS.org - Documentation, latest information, license and
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    contact details.
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    http://www.SafeRTOS.com - A version that is certified for use in safety
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    critical systems.
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    http://www.OpenRTOS.com - Commercial support, development, porting,
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    licensing and training services.
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*/
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/*-----------------------------------------------------------
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 * Components that can be compiled to either ARM or THUMB mode are
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 * contained in serial.c  The ISR routines, which can only be compiled
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 * to ARM mode, are contained in this file.
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 *----------------------------------------------------------*/
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/* Library includes. */
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#include "75x_uart.h"
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/* Scheduler includes. */
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#include "FreeRTOS.h"
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#include "queue.h"
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static xQueueHandle xRxedChars;
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static xQueueHandle xCharsForTx;
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static portBASE_TYPE volatile *pxQueueEmpty;
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void vConfigureQueues( xQueueHandle xQForRx, xQueueHandle xQForTx, portBASE_TYPE volatile *pxEmptyFlag )
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{
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        xRxedChars = xQForRx;
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        xCharsForTx = xQForTx;
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        pxQueueEmpty = pxEmptyFlag;
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}
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/*-----------------------------------------------------------*/
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void vSerialISR( void )
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{
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signed char cChar;
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portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
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        do
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        {
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                if( UART0->MIS & UART_IT_Transmit )
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                {
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                        /* The interrupt was caused by the THR becoming empty.  Are there any
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                        more characters to transmit? */
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                        if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
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                        {
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                                /* A character was retrieved from the queue so can be sent to the
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                                THR now. */
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                                UART0->DR = cChar;
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                        }
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                        else
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                        {
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                                *pxQueueEmpty = pdTRUE;
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                        }
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                        UART_ClearITPendingBit( UART0, UART_IT_Transmit );
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                }
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                if( UART0->MIS & UART_IT_Receive )
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                {
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                        /* The interrupt was caused by a character being received.  Grab the
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                        character from the RHR and place it in the queue of received
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                        characters. */
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                        cChar = UART0->DR;
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                        xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
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                        UART_ClearITPendingBit( UART0, UART_IT_Receive );
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                }
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        } while( UART0->MIS );
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        /* If a task was woken by either a character being received or a character
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        being transmitted then we may need to switch to another task. */
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        portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
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}
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