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Hi,
for the past few days i'm programming TRF7970A EVM with my own source code. I would like to read ISO15693 tag ID.
My problem is that TRF7970 keeps sending me interrupt on IRQ pin (13) with frequency around 2kHz and if i read value of IRQ status register i get (0xC6).
My TRF initial settings are:
Delay_ms(2);
SPI_SS_HIGH;
Delay_ms(4);
ENABLE;
Delay_ms(1);
SPI_send_command(SOFT_INIT);
SPI_send_command(IDLE);
Delay_ms(3);
SPI_send_command(RESET);
Delay_ms(2);
*spi.txbuf = 0x31; //Chip status control
*(spi.txbuf + 1) = 0x02; //Iso control
*(spi.txbuf + 2) = 0x00; //ISO mode Option 1
*(spi.txbuf + 3) = 0x00; //ISO mode Option 2
*(spi.txbuf + 4) = 0xC1; //TX timer
*(spi.txbuf + 5) = 0xBB; //TX timer low
*(spi.txbuf + 6) = 0x00; //TX Pulse length Control
*(spi.txbuf + 7) = 0x25; //RX No Response Wait time
*(spi.txbuf + 8) = 0x1F; //RX Wait time
*(spi.txbuf + 9) = 0x31; //Modulator control
*(spi.txbuf + 10) = 0x40; //RX special settings
*(spi.txbuf + 11) = 0x87; //Regulator control
SPI_write(12, CHIP_STATUS_CONTROL);
Delay_ms(1);
*spi.txbuf = 0x3F; //Enable no response interrupt
SPI_write(1, IRQ_MASK);
*spi.txbuf = 0x00;
SPI_write(1, NFC_TARGET_LEVEL );
And my commands for reading tag ID:
SPI_send_command(RESET);
SPI_send_command(TRANSMIT_CRC);
spi.txbuf[0] = 0x26;
spi.txbuf[1] = 0x01;
spi.txbuf[2] = 0x00;
FIFO_write(3);
Can you please give me some advice what i'm doing wrong
from a high level, you need to encompass the "write continuous" and "# of bytes to be sent" in your string
like this:
