NRF52 ESB RX-TX

[Amigo]

how to change RX and TX operations ? i wrote next code:

#include "nrf_esb.h"
#include <stdbool.h>
#include <stdint.h>
#include "sdk_common.h"
#include "nrf.h"
#include "nrf_esb_error_codes.h"
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "nrf_error.h"
#include "nrf_log.h"
#include "boards.h"
#include "nrf_log.h"

#define RX 0 
#define TX 1 

uint8_t RX_MODE_FLAG = 0;
uint8_t TX_MODE_FLAG = 0;

const uint8_t leds_list[LEDS_NUMBER] = LEDS_LIST;
uint8_t led_nr;

nrf_esb_payload_t 				rx_payload;
nrf_esb_payload_t        	tx_payload = NRF_ESB_CREATE_PAYLOAD(0, 0xC1, 0x00, 0x05);

void nrf_esb_error_handler(uint32_t err_code, uint32_t line)
{
    NRF_LOG_PRINTF("App failed at line %d with error code: 0x%08x\r\n",
                   line, err_code);
#if DEBUG 
    while(true);
#else
    NVIC_SystemReset();
#endif
}

#define APP_ERROR_CHECK(err_code) if(err_code) nrf_esb_error_handler(err_code, __LINE__);

void nrf_esb_event_handler(nrf_esb_evt_t const * p_event)
{
    switch (p_event->evt_id)
    {
        case NRF_ESB_EVENT_TX_SUCCESS:
            NRF_LOG("TX SUCCESS EVENT\r\n");
				    // Toggle one of the LEDs.
						nrf_gpio_pin_toggle(LED_2);
            break;
        case NRF_ESB_EVENT_TX_FAILED:
            NRF_LOG("TX FAILED EVENT\r\n");
						nrf_gpio_pin_toggle(LED_3);
						nrf_esb_flush_tx();
            break;
        case NRF_ESB_EVENT_RX_RECEIVED:
            NRF_LOG("RX RECEIVED EVENT\r\n");
            if (nrf_esb_read_rx_payload(&rx_payload) == NRF_SUCCESS)
            {
							// Set LEDs identical to the ones on the PTX.
							nrf_gpio_pin_toggle(LED_4);
            }
						nrf_esb_flush_rx();
						TX_MODE_FLAG = 1;
            break;
    }
		//NRF_GPIO->OUTCLR = 0xFUL << 12;
    //NRF_GPIO->OUTSET = (p_event->tx_attempts & 0x0F) << 12;
}

void clocks_start( void )
{
    NRF_CLOCK->EVENTS_HFCLKSTARTED = 0;
    NRF_CLOCK->TASKS_HFCLKSTART = 1;
    while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0);
}

void gpio_init( void )
{
    LEDS_CONFIGURE(LEDS_MASK);
}

uint32_t esb_init( uint8_t state )
{
    uint32_t err_code;
    uint8_t base_addr_0[4] = {0xE7, 0xE7, 0xE7, 0xE7};
    uint8_t base_addr_1[4] = {0xC2, 0xC2, 0xC2, 0xC2};
    uint8_t addr_prefix[8] = {0xE7, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8 };
			
    nrf_esb_config_t nrf_esb_config         = NRF_ESB_DEFAULT_CONFIG;
    nrf_esb_config.payload_length           = 32;
		nrf_esb_config.retransmit_delay         = 1000;
		nrf_esb_config.retransmit_count					= 2;
    nrf_esb_config.protocol                 = NRF_ESB_PROTOCOL_ESB;
    nrf_esb_config.bitrate                  = NRF_ESB_BITRATE_2MBPS;
		switch(state){
			case RX:
						nrf_esb_config.mode                     = NRF_ESB_MODE_PRX;
			break;
			case TX:
						nrf_esb_config.mode                     = NRF_ESB_MODE_PTX;
			break;	
		}
    nrf_esb_config.event_handler            = nrf_esb_event_handler;
		nrf_esb_config.crc											= NRF_ESB_CRC_16BIT;	
    nrf_esb_config.selective_auto_ack       = true;
		
		err_code = nrf_esb_set_rf_channel(14);
		VERIFY_SUCCESS(err_code);
		
    err_code = nrf_esb_init(&nrf_esb_config);
    VERIFY_SUCCESS(err_code);

    err_code = nrf_esb_set_base_address_0(base_addr_0);
    VERIFY_SUCCESS(err_code);

    err_code = nrf_esb_set_base_address_1(base_addr_1);
    VERIFY_SUCCESS(err_code);

    err_code = nrf_esb_set_prefixes(addr_prefix, 8);
    VERIFY_SUCCESS(err_code);

    return err_code;
}

int main(void)
{
    uint32_t err_code;

    gpio_init();

    err_code = NRF_LOG_INIT();
    APP_ERROR_CHECK(err_code);

    clocks_start();

    err_code = esb_init(RX);
    APP_ERROR_CHECK(err_code);

    NRF_LOG("Enhanced ShockBurst Receiver Example running.\r\n");
	
	  err_code = nrf_esb_start_rx();
    APP_ERROR_CHECK(err_code);
    while (true)
    {
			
			if(TX_MODE_FLAG)
			{
				//err_code = nrf_esb_stop_rx();
				err_code = esb_init(TX);
				
			  tx_payload.length = 32;
				tx_payload.pipe = 0;
				tx_payload.noack = true;
				tx_payload.data[1]++;
				
				err_code = nrf_esb_start_tx();
        if (nrf_esb_write_payload(&tx_payload) == NRF_SUCCESS)
        {
						nrf_gpio_pin_toggle(LED_1);	
				}	
				
				TX_MODE_FLAG = 0;
				err_code = esb_init(RX);
				err_code = nrf_esb_start_rx();
			}
        __WFE();
    }
}

Recieve is working nice. But there is TX error event. And after 4th time tx stopted.

[Jørgen Kvalvaag]

TX error means that the packet was not ACKed by the receiver. If you don't have a receiver/RX set up you will get TX failed event for every payload you send.

[Amigo]

My 2nd device is nrf24l01 was set up with auto ack with retransmition (1000 us up to 2 times). It works well with nrf52 only in TX mode or in Rx mode separatly. but i need nrf52 to start to works in rx mode. By request nrf52 has to answer on request, that means nrf52 runs in tx mode. then it turns back in RX mode.

[Hung Bui]

@Amigo: Please describe your set-up more clearly. When you switch nRF52 with RX and TX mode, which device will act as peer device ? How would they sync ?

[Amigo]

@Hung Bui:

i'm using NRF24l01 with stm32 as server. nrf52-dk board with some sensors as a client. Server send to a client (clients) request packet (any user protocol). Client (nrf52) cheks an itsef's address, command and execute required functions. Then client sends data back to master (NRF24L01). Server uses ADDRESS_P0[] = {0xE7, 0xE7, 0xE7, 0xE7, 0xE7}; pipe. Client may use one of other pipes adresses.

NRF24 configuration: 2Mbps, auto ACK, 2byte CRC

void Radio_Config(void) 
{
  Radio_Write_Reg(STATUS, NOP);
  Radio_Write_Reg(CONFIG, 0x00);
  
  NRF_CSN_LO();
  SPI_rw(FLUSH_RX);
  NRF_CSN_HI();

  NRF_CSN_LO();
  SPI_rw(FLUSH_TX);
  NRF_CSN_HI();
  
  //RF settings 0 dBm, 2 Mbps, LNA Set up
  Radio_Write_Reg(RF_SETUP, 0x0F);
  //Channel settings - #4 0 to 125  
  Radio_Write_Reg(RF_CH, NRF_CHANNEL);
  //ACK settings - with ACK
  Radio_Write_Reg(EN_AA, 0xFF);
  //1000 us retransmission up to 2 times
  Radio_Write_Reg(SETUP_RETR, 0x50);

 //32 byte fifo
  Radio_Write_Reg(RX_PW_P0, NRF_BUFF_SIZE);
  Radio_Write_Reg(RX_PW_P1, NRF_BUFF_SIZE);
  
  //for RX_MODE
  //enable Pipe0, Pipe1
  Radio_Write_Reg(EN_RXADDR, 0x03);
  
  Radio_WrRXAddr(RX_ADDR_P0, ADDRESS_P0, 5);
  Radio_WrRXAddr(RX_ADDR_P1, ADDRESS_P1, 5);
  Radio_WrRXAddr(RX_ADDR_P2, ADDRESS_P2, 5);
  Radio_WrRXAddr(RX_ADDR_P3, ADDRESS_P3, 5);
  Radio_WrRXAddr(RX_ADDR_P4, ADDRESS_P4, 5);
  Radio_WrRXAddr(RX_ADDR_P5, ADDRESS_P5, 5);
  
//for TX_MODE		
  //Radio_WrTXAddr(ADDRESS_P0, 5);
  Radio_WrTXAddr(ADDRESS_P1, 5);
}

[Hung Bui]

@Amigo : Please edit your question and add your explanation or code in. What you wrote here is not an answer for your question. You can either comment or edit question to add information. please remove this answer after you have done.