nrf_esb_tx_success not called in receive mode

[Lodge]

Hello, I have looked at several posts on here, including- https://devzone.nordicsemi.com/question/3769/nrf51822-to-nrf24l01/

And followed the code, but I am trying to do the same thing, but in receive mode. However, nothing is sent back to the transmitter (an NRF24LE01+) which I set pipe 0 address to default of 0xE7, 0xE7, 0xE7, 0xE7, 0xE7, 0xE7. The code is here-

    byte pipe0Address[5] = {0xE7, 0xE7, 0xE7, 0xE7, 0xE7};	
    byte temp[5] = {0xBD, 0xB0, 0x35, 0x97, 0x82};
    byte nrfRxData[32];
       
    void EsbInitialize(void)
    {
    	nrf_esb_set_xosc_ctl(NRF_ESB_XOSC_CTL_AUTO); // Set auto handling for oscillator
    	nrf_esb_init(NRF_ESB_MODE_PRX); // Set receive mode
    	nrf_esb_set_output_power(NRF_ESB_OUTPUT_POWER_4_DBM); // Set output power to maximum 4db
    	nrf_esb_set_base_address_length(NRF_ESB_BASE_ADDRESS_LENGTH_4B); // Set address length
    	nrf_esb_set_enabled_prx_pipes(0x0003); // Enable receive pipes
    	nrf_esb_enable_dyn_ack(); // Enable dynamic acknowledge
    	nrf_esb_set_crc_length(NRF_ESB_CRC_LENGTH_2_BYTE); // Set 16 bit crc 
    	nrf_esb_set_datarate(NRF_ESB_DATARATE_2_MBPS); // Set data rate
    	nrf_esb_set_retransmit_delay(250); // Set retransmit delay to 250us
    	nrf_esb_set_max_number_of_tx_attempts(15); // Set retry limit to 15
    	nrf_esb_set_base_address_0(0xE7E7E7E7); // Set pipe 0 address
    	nrf_esb_set_address_prefix_byte(0, 0xE7); // Set pipe 0 prefix byte
    	nrf_esb_set_channel(40); // Set rf channel to 40
    	nrf_esb_add_packet_to_tx_fifo(0, temp, 5, NRF_ESB_PACKET_USE_ACK); // Add data to return data to transmtter
    	nrf_esb_add_packet_to_tx_fifo(0, temp, 5, NRF_ESB_PACKET_USE_ACK);
    	nrf_esb_enable(); // Enable chip
    }

void nrf_esb_rx_data_ready(uint pipe, int rssi)
{
	nrf_esb_fetch_packet_from_rx_fifo(pipe, nrfRxData, &length);
	nrf_esb_flush_rx_fifo(pipe);
}

void nrf_esb_tx_success(uint tx_pipe, int rssi) 
{
	nrf_esb_add_packet_to_tx_fifo(0, temp, 5, NRF_ESB_PACKET_USE_ACK);
}

void nrf_esb_tx_failed(uint tx_pipe) 
{
}

void nrf_esb_disabled(void) 
{
}

I hit a breakpoint on the nrf_esb_rx_data_ready function whenever I transmit a packet, but the function nrf_esb_tx_success never gets called and no data is ever received by the transmitter. Can anyone help?

Many Thanks.

[Lodge]

Hello Asbjørn,

On further investigation, I have noticed:

I set the transmitter address to 0xE7, 0xE7, 0xE7, 0xE7, 0xE7.

On the rx side I use-

nrf_esb_set_address_prefix_byte(0, 0xE7);

nrf_esb_set_base_address_0(0xE7E7E7E7);

and I do NOT call nrf_esb_enable_dyn_ack(), then I receive the tx data in nrf_esb_rx_data_ready()

and call nrf_esb_add_packet_to_tx_fifo which does successfully send data to the tx.

This is the only way I can get it to operate properly.

However, if I DO call nrf_esb_enable_dyn_ack(), I do receive the tx data, and a call to nrf_esb_add_packet_to_tx_fifo() returns true, but the transmitter does not receive any ack data.

Also, if I change the address to anything other than 0xE7, 0xE7, 0xE7, 0xE7, 0xE7, it does not matter whether I call nrf_esb_enable_dyn_ack() or not, I receive the tx data, a call to nrf_esb_add_packet_to_tx_fifo() returns true, but no data is received by the transmitter.