Demo/PIC18_WizC/serial/isrSerialRx.c

/*
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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.
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*/

/*
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 xQueueHandle 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 */