void write_emul_tag_uid(const uint8_t* tag_uid_buffer)
{
uint8_t data_buf[11];
int i;
data_buf[0] = NFCID;
for(i = 1; i < 11; i++) {
data_buf[i] = tag_uid_buffer[i-1];
}
Trf797xWriteCont(data_buf, 11);
}
//-------------------------------------------------------
//This is the main NFC send function that has to follow
//the RFAnticollisionAvoidance function - in active mode.
//-------------------------------------------------------
u08_t
NfcSend(u08_t *pbuf)
{
u08_t length, k = 0;
IRQ_OFF;
Trf797xReset();
nfc_state = *pbuf; //nfc_state global variable is the main transmit counter
length = *pbuf;
if(length > FIFO_LEN)
{
length = FIFO_LEN;
}
//kputchar('S');
//Put_byte(length);
//kputchar('S');
*(pbuf - 5) = 0x8f;
*(pbuf - 4) = 0x91; //buffer setup for FIFO writing
*(pbuf - 3) = 0x3d;
*(pbuf - 2) = (char)(nfc_state >> 4);
*(pbuf - 1) = (char)(nfc_state << 4);
//RAWwrite(command, 5, 1, 0); //send the request using RAW writing
Trf797xRawWrite((pbuf - 5), (length + 5));
IRQ_ON;
/*
*(pbuf - 1) = 0x1F;
WriteCont(pbuf - 1, length + 1); //send the request using RAW writing
//Write FIFO_LEN bytes the first time you write to FIFO */
nfc_state = nfc_state - FIFO_LEN;
i_reg = 0x01;
pbuf += length;
irq_flag = 0x00;
while(nfc_state > 0)
{
McuCounterSet(); //TimerA set
COUNT_VALUE = 0xf000; //74ms
START_COUNTER; //start timer up mode
while(irq_flag == 0x00)
{
}
if(irq_flag == 0x03) // Timer Event
{
buf[0] = 0x00;
buf[1] = 0x01;
Trf797xWriteSingle(buf, 2);
Trf797xResetIrqStatus();
return 0;
}
if(nfc_state > FIFO_MORE) //the number of unsent bytes is in the NFCstate global
{
length = FIFO_MORE + 1; //count variable has to be 10 : 9 bytes for FIFO and 1 address
}
else if(nfc_state < 1)
{
break; //return from interrupt if all bytes have been sent to FIFO
}
else
{
length = nfc_state + 1; //all data has been sent out
}//if
*(pbuf - 1) = FIFO; //writes FIFO_MORE or less bytes to FIFO for transmitting
Trf797xWriteCont(pbuf - 1, length);
nfc_state = nfc_state - FIFO_MORE;//write FIFO_MORE bytes to FIFO
pbuf += FIFO_MORE;
}//while
i_reg = 0x01;
while(i_reg != 0x00 && k < 2){ //end of TX recieved
k++;
McuCounterSet(); //TimerA set
COUNT_VALUE = 0xf000; //74ms
START_COUNTER; //start timer up mode
irq_flag = 0x00;
while(irq_flag == 0x00)
{
}
}
Trf797xResetIrqStatus();
//kputchar('=');
//kputchar('=');
return 1;
}//NFCSend