Set error state if no delay or already expired

[cmsis-freertos] / Demo / PIC18_WizC / serial / isrSerialRx.c

/*
 * FreeRTOS Kernel V10.1.1
 * Copyright (C) 2018 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * http://www.FreeRTOS.org
 * http://aws.amazon.com/freertos
 *
 * 1 tab == 4 spaces!
 */

/*
Changes from V3.0.0
        + ISRcode pulled inline to reduce stack-usage.

        + Added functionality to only call vTaskSwitchContext() once
          when handling multiple interruptsources in a single interruptcall.

        + Filename changed to a .c extension to allow stepping through code
          using F7.

Changes from V3.0.1
*/

#ifndef _FREERTOS_SERIAL_ISRSERIALRX_C
#define _FREERTOS_SERIAL_ISRSERIALRX_C

#define serCONTINUOUS_RX                ( 1 )
#define serCLEAR_OVERRUN                ( 0 )

{
        /*
         * Was the interrupt a byte being received?
         */
        if( bRCIF && bRCIE)
        {
                /*
                 * Queue to interface between comms API and interrupt routine.
                */
                extern QueueHandle_t xRxedChars;
                
                /*
                 * Because we are not allowed to use local variables here,
                 * PRODL is (ab)used as temporary storage.  This is allowed
                 * because this SFR will be restored before exiting the ISR.
                 */
                extern char                     cChar;
                extern portBASE_TYPE xHigherPriorityTaskWoken;
                #pragma locate cChar    &PRODL

                /*
                 * If there was a framing error, just get and ignore
                 * the character
                 */
                if( bFERR )
                {
                        cChar = RCREG;
                }
                else
                {
                        /*
                         * Get the character and post it on the queue of Rxed
                         * characters. If the post causes a task to wake ask
                         * for a context switch as the woken task may have a
                         * higher priority than the task we have interrupted.
                         */
                        cChar = RCREG;

                        /*
                         * Clear any overrun errors.
                         */
                        if( bOERR )
                        {
                                bCREN = serCLEAR_OVERRUN;
                                bCREN = serCONTINUOUS_RX;       
                        }

                        xHigherPriorityTaskWoken = pdFALSE;
                        xQueueSendFromISR( xRxedChars, ( const void * ) &cChar, &xHigherPriorityTaskWoken );

                        if( xHigherPriorityTaskWoken )
                        {
                                uxSwitchRequested = pdTRUE;
                        }
                }
        }
}

#endif  /* _FREERTOS_SERIAL_ISRSERIALRX_C */