Example code for read/writing user memory

this code was written for the TRF7970A BoosterPack, for the -G2xx LP...but you could use it i think since you have gotten this far on an -F5xx

see function called NFC_TYPE2_WRITE_BLOCK, in iso14443a.c file

and the attached presentation. 

code ==> 4011.TRF7970ABP_Project_10_24_2014.zip

presentation ==> 5824.NFC Forum Type 2 Tag Platform Operations with TRF7970A_02_18_2014.pdf

Thanks for the quick reply Josh.. I'll work on it and report back.

Hi Josh,

I think there is something wrong in the data dump into the UART host at the end of the NFC_TYPE2_WRITE_BLOCK function. Please correct me if I'm wrong.

We need the block that was written in to be displayed on the host terminal.
 Is that correct? In that case we would need to display 4 bytes buf[7] onwards.

BTW I was able to write to the tag. Thanks!

void NFC_TYPE2_WRITE_BLOCK(void) //test function on one block for now (01/27/2014, JDW)
{
	u08_t	i = 1, j = 0;
	u16_t	k;

	buf[0] = ISO_CONTROL;
	buf[1] = 0x88;							//to RX with CRC
	Trf7970WriteSingle(&buf[0], 2);

	buf[0] = SPECIAL_FUNCTION;			//to enable 4-bit RX
	buf[1] = 0x04;							//setting bit 2 in register 0x10
	Trf7970WriteSingle(&buf[0], 2);

	buf[0] = 0x8F;							//Reset FIFO
       buf[1] = 0x91;							//Send with CRC
       buf[2] = 0x3D;							//Write Continuous
       buf[3] = 0x00;							//upper and middle nibbles of # of bytes going to FIFO
       buf[4] = 0x60;							//lower nibble # and broken # of bytes going to FIFO (in this case 2 complete bytes are going to be transmitted)
	buf[5] = 0xA2;							//Write Command
	buf[6] = 0x03;							//Block # (called Bno) to write
	buf[7] = 0xE1;							// for Type 2 NDEF formatting, using on Page 3: E1:10:12:00 (Mifare Ultralight C) or E1:11:12:10 (Mifare Ultralight) THIS IS OTP BLOCK!
	buf[8] = 0x10;							//										Page 4: 01:03:A0:10
	buf[9] = 0x12;							//										Page 5:	44:03:00:FE (blocks 3, 4 & 5 required to be considered NDEF formatted and empty)
	buf[10] = 0x00;							//


    rxtx_state = 1;

    Trf7970RawWrite(&buf[0], 11);

    IRQ_CLR;								// PORT2 interrupt flag clear
	IRQ_ON;

	//ISO14443IRQWaitTimeout(5,50);

	i_reg = 0x01;
	irq_flag = 0x00;
	START_COUNTER;										//	Starting Timeout

	while(irq_flag == 0x00)
	{
	}													// wait for end of TX interrupt
	RESET_COUNTER;

	McuCounterSet();									// TimerA set
	COUNT_VALUE = COUNT_1ms * 20;
	START_COUNTER;										// start timer up mode

	irq_flag = 0x00;

	while(irq_flag == 0x00)
	{
	}													// wait for interrupt
	RESET_COUNTER;





	while(i_reg == 0x01)								// wait for RX complete
	{
		k++;

		if(k == 0xFFF0)
		{
			i_reg = 0x00;
			rx_error_flag = 0x00;

		}
	}

	if( i_reg == 0xFF)
		{		// if received block data in buffer
		if(stand_alone_flag == 1)
		{
			//found = 1;
			#ifdef ENABLE_HOST
			for(j = 0; j < 7; j++){
				UartSendCString("NFC Type2 Block ");
				//UartPutByte(ui8StartBlock++);
				UartSendCString(":  [");
				for(i = 1+(j*4); i < 5+(j*4); i++)
				{
					UartPutByte(buf[i]);		// send block data to host
				}
				UartPutChar(']');
				UartPutCrlf();
			}

			#endif
		}
	}

}