Porting nRF24LE1 RF code to NRF51822 Radio

[Scott]

My application currently uses 2 nRF24LE1 for communication. I am porting over one side to the nRF51822. My first step is just trying to send out packets from the nRF51822 to the nRF24LE1. Using the code below, the nRF24LE1 receives only the 4th packet after being power cycled. It doesn't receive any other packet. Note that my application can't use ACK. Any suggestions on what to fix?

UPDATED 9/24/15:

I still can't get reliable communications from the nRF51822->nRF24LE1. I only get the 4th packet sent. After that I don't receive anything until I power-cycle the nRF24LE1. I have been trying different settings but I have been unable to locate the magic combination. Any suggestions?

Note: I do have communications from the nRF24LE1->nRF51822.

nRF51822 transmitter:

nrf_esb_init(NRF_ESB_MODE_PTX); nrf_esb_set_base_address_0(0xA7A7A7A7); nrf_esb_set_base_address_1(0xA7A7A7A7); nrf_esb_set_address_prefix_byte(0, 0xA7); nrf_esb_set_address_prefix_byte(1, 0xA8); nrf_esb_set_address_prefix_byte(2, 0xA9); nrf_esb_set_address_prefix_byte(3, 0xAA); nrf_esb_set_address_prefix_byte(4, 0xAB); nrf_esb_set_address_prefix_byte(5, 0xAC); nrf_esb_set_address_prefix_byte(6, 0xAD); nrf_esb_set_address_prefix_byte(7, 0xAE); nrf_esb_set_datarate(NRF_ESB_DATARATE_1_MBPS); nrf_esb_set_crc_length(NRF_ESB_CRC_OFF); nrf_esb_set_output_power(NRF_ESB_OUTPUT_POWER_0_DBM); nrf_esb_set_base_address_length(NRF_ESB_BASE_ADDRESS_LENGTH_4B); nrf_esb_set_xosc_ctl(NRF_ESB_XOSC_CTL_AUTO); nrf_esb_enable_dyn_ack(); nrf_esb_set_channel(50);

while(true) { // Add packet into TX queue nrf_esb_add_packet_to_tx_fifo(0, mRxBuffer, NRF_ESB_CONST_MAX_PAYLOAD_LENGTH, NRF_ESB_PACKET_NO_ACK); nrf_esb_enable(); nrf_delay_ms(1000); }

nRF24LE1 receiver: uint8_t address[5] = {0xA7, 0xA7, 0xA7, 0xA7, 0xA7}; uint8_t address2[5] = {0xA8, 0xA7, 0xA7, 0xA7, 0xA7};

// Configure radio as primary Reciever (PRX) hal_nrf_set_operation_mode(HAL_NRF_PRX); hal_nrf_set_datarate( HAL_NRF_1MBPS ); hal_nrf_set_output_power( HAL_NRF_0DBM ); hal_nrf_set_auto_retr( 0, 250 ); // turn off the automatic retransmission.

// Set payload width to nRF_PAYLOAD_SIZE bytes // hal_nrf_set_rx_payload_width((int)HAL_NRF_PIPE0, NRF_PAYLOAD_SIZE);

hal_nrf_set_rf_channel( 50 ); hal_nrf_set_address(HAL_NRF_TX, address2); hal_nrf_set_address( HAL_NRF_PIPE0, address ); hal_nrf_setup_dynamic_payload(0xFF); hal_nrf_enable_dynamic_payload(true); hal_nrf_enable_dynamic_ack(true); hal_nrf_enable_ack_payload(false); hal_nrf_set_crc_mode(HAL_NRF_CRC_OFF); hal_nrf_open_pipe(HAL_NRF_PIPE0,false);

// Power up radio hal_nrf_set_power_mode(HAL_NRF_PWR_UP);

while(true) // spin forever { CE_HIGH(); if( !hal_nrf_rx_fifo_empty() ) { hal_nrf_read_rx_payload( rx_payload ); hal_uart_putchar('X'); for (loop=0; loop<32; loop++) { hal_uart_putchar(rx_payload[loop]); } } }

[Hung Bui]

Hi Scott,

Please let me know you are testing with "\nRF_Examples\8.1.0\peripheral\radio" example or with "\examples\proprietary_rf\esb\esb_ptx_prx" ? I'm seeing you are using ESB library but you are setting the radio manually, this is not correct.

Note that if you want two device talk to each other, the TX address on the transmitter should match with the RX address on the receiver.

In the example \examples\proprietary_rf\esb\esb_ptx_prx, we have provided the setup you should use on the nRF24LE1 to test, please have a look at the nrf_esb_constants.h file.

[Hung Bui]

Hi Scott,

I am not quite sure I understand. Which receiver's address are you using ? As far as I can see you are using mReceiveAddress for Pipe0 on your receiver, which is { 0xE7, 0xE7, 0xE7, 0xE7, 0xE8 } but you are trying to send to address { 0xA7, 0xA7, 0xA7, 0xA7, 0xA8 }; from your transmitter. Aren't they should be the same ?

If you want to send data to address { 0xE7, 0xE7, 0xE7, 0xE7, 0xE8 } on the nRF24L, on the nRF51 you should configure as follow:

nrf_esb_set_address_prefix_byte(0, 0xE7);
nrf_esb_set_base_address_0(0xE8E7E7E7);

Dynamic payload, ack payload should be set correctly, as mentioned here in known issues section.

[Scott]

Thank you for clarifying the address conversion - that was helpful.

My earlier post was a bit confusing. I updated the code to the most recent version.