Demo/PC/ParTest/ParTest.c

/*
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	This file is part of the FreeRTOS.org distribution.

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	with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59 
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.

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	combined work that includes FreeRTOS.org without being obliged to provide
	the source code for any proprietary components.  See the licensing section
	of http://www.FreeRTOS.org for full details.


	***************************************************************************
	*                                                                         *
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	*                                                                         *
	* This is a concise, step by step, 'hands on' guide that describes both   *
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	* explains numerous examples that are written using the FreeRTOS API.     *
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	Please ensure to read the configuration and relevant port sections of the
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*/

/*
Changes from V1.01:

	+ Types used updated.
	+ Add vParTestToggleLED();


Changes from V2.0.0

	+ Use scheduler suspends in place of critical sections.
*/

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

#define partstALL_OUTPUTS_OFF			( ( unsigned portCHAR ) 0x00 )
#define partstMAX_OUTPUT_LED			( ( unsigned portCHAR ) 7 )

/*lint -e956 File scope parameters okay here. */
static unsigned portSHORT usPortAddress = partstDEFAULT_PORT_ADDRESS;
static volatile unsigned portCHAR ucCurrentOutputValue = partstALL_OUTPUTS_OFF;
/*lint +e956 */


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

void vParTestInitialise( void )
{
	ucCurrentOutputValue = partstALL_OUTPUTS_OFF;

	portOUTPUT_BYTE( usPortAddress, ( unsigned ) partstALL_OUTPUTS_OFF );
}
/*-----------------------------------------------------------*/

void vParTestSetLED( unsigned portBASE_TYPE uxLED, 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;
		}

		portOUTPUT_BYTE( usPortAddress, ( unsigned ) 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;
			}

			portOUTPUT_BYTE( usPortAddress, ( unsigned ) ucCurrentOutputValue );
		}
		xTaskResumeAll();			
	}
}