TRF7960: TRF7960

Hi,

I started working on a board that include the TRF7960 and a PIC MCU.

I have an old code to read a tag uid that is working well and I try to modify it to read multiple tags.

My reg init:

uint8 RFID_INIT_REG[31] = {	0x21,0x02,0x00,0x00,0xC1,0xBB,0x00,0x0F,0x02,0x21,0x40,0x87,0x00,0x3E,0x00,0x40,
                        	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
void rfid_init(){
	int i;
	TRISDbits.TRISD2  = 0; // RFID EN pin set to output
	TRISDbits.TRISD8  = 1; // RFID IRQ pin set to input
	TRISBbits.TRISB2  = 0; // RFID SS pin set to output	

	IFS0bits.SPI1IF = 0;                     /* Clear IF bit */
    //IPC2bits.SPI1IP = (config &0x0007);    /* Assign interrupt priority */
    IEC0bits.SPI1IE = 1;					 /* Interrupt Enable bit */
	RF_PWR_EN = 1; // enable RFID
	spi_init();

	for(i=0;i<31;i++)
		rfid_setReg(i, RFID_INIT_REG[i]);

	RFID_output(TRUE);
}

Then, i try to read multiple tags like so:

void read_TAGID(uint8* tagData){
	int i,j,k,slot;
	uint8 retMsg[50];
	uint8 cmdData[8] ={ 0x8f, 0x91, 0x3d, 0x00, 0x30, 0x06, 0x01, 0x00 };
	RF_SS = 0; // clear SS
	for(k=0;k<8;k++)
		rfid_sendByte(cmdData[k]);
	RF_SS = 1; // set SS
	uint8 status = rfid_getReg(0x0C);
	sprintf(retMsg, "Got from 0x0c: %02X", status);
	SendMsg(READ_TAG_ID ,retMsg, strlen(retMsg));
	sprintf(retMsg, "Got from 0x1c: %02X", rfid_getReg(0x1C));
	SendMsg(READ_TAG_ID ,retMsg, strlen(retMsg));

	for (i=0;i<5500;i++) j=1; //delay
	rfid_sendByte(0x0F);	
	rfid_sendByte(0x17);
	for(slot=0;slot<16;slot++){
		for (i=0;i<5500;i++) j=1; //delay
		rfid_getReg(0x1F);
		rfid_getReg(0x1F);
		for(k=0;k<8;k++)
			tagData[k] = rfid_getReg(0x1F);
		sprintf(retMsg, "%02X %02X %02X %02X %02X %02X %02X %02X", 
							tagData[7], tagData[6], tagData[5], tagData[4], tagData[3], tagData[2], tagData[1], tagData[0]);
		SendMsg(READ_TAG_ID ,retMsg, strlen(retMsg));
		rfid_sendByte(0x0F);	
		rfid_sendByte(0x16);
		rfid_sendByte(0x17);	
		rfid_sendByte(0x14);
}

I'm searching google endlessly in order to it and I found articles and datasheets but don't understand the mechanism.

Please help me with a code,example or pointers.

Thanks,

Ofer.