Hello TI Team,
I am trying to establish a P2P communication between to TRF7970A devices. My first step is to implement a passive Target device with 424 kbps and use an TRF7970A Boosterpack in initator mode (see picture TI_NFC_TOOL_INITATOR.PNG)
According to your “P2P SNEP Operation Overview” I should receive an ATR_REQ command after sending the SENF_RES.
But I only receiving some protocol errors IrqStatus(0x0C, val == 0x50) and after that the procedure is repeating with a sensf request (see putty output, picture UART_OUTPUT.PNG). Could you please tell what I miss here?
My target implantation is based on your implementation I found here:
After receiving a valid SENSF_REQ command from the initator I switch the Target device frequency to 424 kbs and send the sensf response:
bool Trf7970a::nfcfProcessReceivedRequest(uint8_t* dataReceived, uint8_t size){
uint8_t commandLength = dataReceived[0];
uint8_t command = dataReceived[1];
// Handle only SENSF_REQ_CMD for now
if(command==SENSF_REQ && commandLength == 0x06 && size==0x06){
if(dataReceived[2]==0xff && dataReceived[3]==0xff){
// NRF_LOG_INFO("Send sensf res")
//switch Baudrate
writeRegister(ISO_CONTROL, 0x23);
// Register 09h. Modulator Control Register - ASK (10 %)
writeRegister(MODULATOR_SYS_CLK_CONTROL, 0x00);
sendSensF_Res();
return true;
}else{
return false;
}
}else{
return false;
}
}
void Trf7970a::sendSensF_Res(){
uint8_t ui8NFC_F_Packet[18];
//
// Length
//
ui8NFC_F_Packet[0] = 0x12;
//
// Command
//
ui8NFC_F_Packet[1] = SENSF_RES;
ui8NFC_F_Packet[2] = 0x01; // NFCID
ui8NFC_F_Packet[3] = 0xFE; // NFCID
ui8NFC_F_Packet[4] = 0x88; // NFCID
ui8NFC_F_Packet[5] = 0x77; // NFCID
ui8NFC_F_Packet[6] = 0x66; // NFCID
ui8NFC_F_Packet[7] = 0x55; // NFCID
ui8NFC_F_Packet[8] = 0x44; // NFCID
ui8NFC_F_Packet[9] = 0x33; // NFCID
ui8NFC_F_Packet[10] = 0xC0; // PAD0
ui8NFC_F_Packet[11] = 0xC1; // PAD0
ui8NFC_F_Packet[12] = 0xC2; // PAD1
ui8NFC_F_Packet[13] = 0xC3; // PAD1
ui8NFC_F_Packet[14] = 0xC4; // PAD1
ui8NFC_F_Packet[15] = 0xC5; // MRTI
ui8NFC_F_Packet[16] = 0xC6; // MRTI
ui8NFC_F_Packet[17] = 0xC7; // MRTI
Delay::ms(2250);
writeFifo(ui8NFC_F_Packet,CRC_BIT_ENABLE, sizeof(ui8NFC_F_Packet));
}
void Trf7970a::writeFifo(uint8_t* data, uint8_t size){
//Read register periodically
uint8_t writeFifo = WRITE|CONTINUOUS_ON|FIFO_IO_REGISTER;
uint8_t data2Write[size+1] = {writeFifo};
memcpy(&(data2Write[1]), data, size);
transmitt(&writeFifo, sizeof(writeFifo), nullptr, 0);
}
