FreeRTOS-Kernel/Demo/AVR_ATMega323_WinAVR/ParTest/ParTest.c

/*
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	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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*/

/* 
Changes from V2.0.0

	+ Use scheduler suspends in place of critical sections.

Changes from V2.6.0

	+ Replaced the inb() and outb() functions with direct memory
	  access.  This allows the port to be built with the 20050414 build of
	  WinAVR.
*/

#include "FreeRTOS.h"
#include "task.h"
#include "partest.h"

/*-----------------------------------------------------------
 * Simple parallel port IO routines.
 *-----------------------------------------------------------*/

#define partstALL_BITS_OUTPUT			( ( unsigned portCHAR ) 0xff )
#define partstALL_OUTPUTS_OFF			( ( unsigned portCHAR ) 0xff )
#define partstMAX_OUTPUT_LED			( ( unsigned portCHAR ) 7 )

static volatile unsigned portCHAR ucCurrentOutputValue = partstALL_OUTPUTS_OFF; /*lint !e956 File scope parameters okay here. */

/*-----------------------------------------------------------*/

void vParTestInitialise( void )
{
	ucCurrentOutputValue = partstALL_OUTPUTS_OFF;

	/* Set port B direction to outputs.  Start with all output off. */
	DDRB = partstALL_BITS_OUTPUT;
	PORTB = ucCurrentOutputValue;
}
/*-----------------------------------------------------------*/

void vParTestSetLED( unsigned portBASE_TYPE uxLED, signed portBASE_TYPE xValue )
{
unsigned portCHAR ucBit = ( unsigned portCHAR ) 1;

	if( uxLED <= partstMAX_OUTPUT_LED )
	{
		ucBit <<= uxLED;
	}	

	vTaskSuspendAll();
	{
		if( xValue == pdTRUE )
		{
			ucBit ^= ( unsigned portCHAR ) 0xff;
			ucCurrentOutputValue &= ucBit;
		}
		else
		{
			ucCurrentOutputValue |= ucBit;
		}

		PORTB = ucCurrentOutputValue;
	}
	xTaskResumeAll();
}
/*-----------------------------------------------------------*/

void vParTestToggleLED( unsigned portBASE_TYPE uxLED )
{
unsigned portCHAR ucBit;

	if( uxLED <= partstMAX_OUTPUT_LED )
	{
		ucBit = ( ( unsigned portCHAR ) 1 ) << uxLED;

		vTaskSuspendAll();
		{
			if( ucCurrentOutputValue & ucBit )
			{
				ucCurrentOutputValue &= ~ucBit;
			}
			else
			{
				ucCurrentOutputValue |= ucBit;
			}

			PORTB = ucCurrentOutputValue;
		}
		xTaskResumeAll();			
	}
}