I am testing the functionality of NRF24L01+ and for my purposes I have configured it as PTX, No Auto ACK.
I am able to communicate with the chip just fine and able to configure all the registers (confirmed with a logic analyzer).
However when I try to send data, the IRQ pin never goes low.
below is the configuration I used for NRF24L01+
_delay_ms(1000); //allow radio to stabilize after power on
uint8_t val[5];
val[0]=0x00; //disable AA(auto acknowledgements)
RADIO_READWRITE(W, EN_AA, val, 1);
val[0]=0x01; //number of enabled pipes. enable only daya pipe0
RADIO_READWRITE(W, EN_RXADDR, val, 1);
val[0]=0x03; //ADDRESS width setup. 5 bytes
RADIO_READWRITE(W, SETUP_AW, val, 1);
val[0]=0x01; //RF channel setup. 2401 Mhz
RADIO_READWRITE(W, RF_CH, val, 1);
val[0] = 0x07; //RF setup. 0DB max power. 1 mbps max range
RADIO_READWRITE(W, RF_SETUP, val, 1);
val[0] = 0x12; //Tx RF_ADDRESS setup. address of the PRX device
val[1] = 0x12;
val[2] = 0x12;
val[3] = 0x12;
val[4] = 0x12;
RADIO_READWRITE(W, TX_ADDR, val, 5);
val[0]=0x01; //payload width setup. 1 bytes
RADIO_READWRITE(W, RX_PW_P0, val, 1);
val[0]=0x0E; // Config register. PTX + POWER UP + 2BYTE CRC
RADIO_READWRITE(W, CONFIG, val, 1);
_delay_ms(100); //give radio time to reach STANDBY mode (CE=low);
Any idea why the IRQ pin is not going low?
UPDATE:
I checked using polling as well (bit 5 on STATUS register) using the command
while((RADIO_GETSTATUS()&(1<<5))==0){}
PORTB |= (1<<PB0);
and the LED does not light up. So it seems that the packets are not being transmitted. Could my configuration to the NRF24L01+ be wrong?
On probing with logic analyzer,I get this
after the toggle on CE line to TX the payload, I am continuously polling the status register (0x07) and continuously getting 0x0E
