automatic.c

this the firmware provided freely for the trf7960

/*
 * File contains functions for automatic ;
 * detection of tags - without a PC ;
 * connected. ;
 */
#include "automatic.h"
unsigned char	protocol;

/*
 =======================================================================================================================
 =======================================================================================================================
 */

unsigned char FindTags(unsigned char protocol)
{
	/*~~~~~~~~~~~~~~~~~~~~~~~~*/
	unsigned char	command[10];
	/*~~~~~~~~~~~~~~~~~~~~~~~~*/

	while(1)
	{
		if((protocol == 0x00) || (protocol == 0x01))
		{	/* ISO15693 */
			command[0] = ChipStateControl;	/* turn on RF driver */
			command[1] = 0x21;
			command[2] = ISOControl;		/* set register 0x01 for ISO15693 operation */
			command[3] = 0x02;
			WriteSingle(command, 4);
			delay_ms(5);
			flags = 0x06;
			command[0] = 0x00;
			InventoryRequest(command, 0);	/* send Inventory request */

			command[0] = ChipStateControl;	/* turn off RF driver */
			command[1] = 0x01;
			WriteSingle(command, 2);
			delay_ms(1);
			command[0] = IRQStatus;
			ReadSingle(command, 1);			/* clear any IRQs */
		}

		if((protocol == 0x00) || (protocol == 0x02))
		{	/* ISO14443A */
			command[0] = ChipStateControl;
			command[1] = 0x21;
			command[2] = ISOControl;		/* set register 0x01 for ISO14443A operation */
			command[3] = 0x08;
			WriteSingle(command, 4);
			delay_ms(5);
			AnticollisionSequenceA(0x00);	/* do a complete anticollision sequence as described */

			/* in ISO14443-3 standard for tyte A */
			command[0] = ChipStateControl;	/* turn off RF driver */
			command[1] = 0x01;
			WriteSingle(command, 2);
			delay_ms(1);
			command[0] = IRQStatus;
			ReadSingle(command, 1);			/* clear any IRQs */
		}

		if((protocol == 0x00) || (protocol == 0x03))
		{	/* ISO14443B */
			command[0] = ChipStateControl;
			command[1] = 0x21;
			command[2] = ISOControl;			/* set register 0x01 for ISO14443B operation */
			command[3] = 0x0C;
			WriteSingle(command, 4);
			delay_ms(5);
			AnticollisionSequenceB(0xB0, 0x04); /* do a complete anticollision sequence as described */

			/* in ISO14443-3 standard for tyte B */
			command[0] = ChipStateControl;		/* turn off RF driver */
			command[1] = 0x01;
			WriteSingle(command, 2);
			delay_ms(1);
			command[0] = IRQStatus;
			ReadSingle(command, 1);				/* clear any IRQs */
		}

		if((protocol == 0x00) || (protocol == 0x04))
		{	/* Tag-it */
			command[0] = ChipStateControl;
			command[1] = 0x21;
			command[2] = ISOControl;		/* set register 0x01 for TI Tag-it operation */
			command[3] = 0x13;
			WriteSingle(command, 4);
			delay_ms(5);
			flags = 0x00;
			command[0] = 0x00;
			TIInventoryRequest(command, 0); /* Send SID poll command as described in */

			/* Tag-it standard */
			command[0] = ChipStateControl;	/* turn off RF driver */
			command[1] = 0x01;
			WriteSingle(command, 2);
			delay_ms(1);
			command[0] = IRQStatus;
			ReadSingle(command, 1);			/* clear any IRQs */
		}
	}	/* while */
}		/* FindTags */


// === Modifications====================================================
// 11/01/06 Aarthi Removed variable RXdone and replaced with a while(1)
//                 loop since RXdone is no longer needed to check if SPI
//                 data is received (due to stack manipulation done in 
//                 ISR).
// =====================================================================