nRF24L01+ Pipe2 to Pipe5 not working.

[Pradeep Chl]

In an RFID application, we have nrf24l01+ and SMT32F4xx on the Reader and nrf24lu1+ on the tag.

The Reader is acting as multiceiver currently.

Pipe 0 and Pipe 1 are working fine. We have problem with Pipe 2 to Pipe 5.

RF channel is 2 , payload is 10, 250Kbps data rate.

Following is the register dump on the Reader: RX_ADDR_P0 = e7 e7 e7 e7 e7, RX_ADDR_P1 = e1 e1 e1 e1 e0, RX_ADDR_P2 = d2, RX_ADDR_P3 = c3, RX_ADDR_P4 = b4, RX_ADDR_P5 = a5, CONFIG = b, EN_AA = 3f, EN_RXADDR = 3f, SETUP_AW = 3, SETUP_RETR = 4f, RF_CH = 2, RF_SETUP = 26, RX_PW_P0 = a, RX_PW_P1 = a, RX_PW_P2 = a, RX_PW_P3 = a, RX_PW_P4 = a, RX_PW_P5 = a.

Rgds, Pradeep

[Hung Bui]

Hi Pradeep,

I would need to see your code for configuration on both side receiver and transmitter. Have you tried to test with our nRFGO SDK's examples ?

[Pradeep Chl]

For the tag as transmitter, we have used nRFGO SDK's example. For Reader as receiver, please check below code.

Reader Code:

uint8_t rx1_address[5] = {0xE1, 0xE1, 0xE1, 0xE1, 0xE0};
uint8_t rx2_address[1] = { 0xD2 };
uint8_t rx3_address[1] = { 0xC3 };
uint8_t rx4_address[1] = { 0xB4 };
uint8_t rx5_address[1] = { 0xA5 };
volatile uint8_t IRQ1 = 0;

    void main()
 {
// init hardware pins 
    nrf24_init();

// Set the device addresses 
        nrf24_rx1_address(rx1_address);  // RX_ADDR_P1. E1E1E1E1E0
	nrf24_rx2_address(rx2_address);  // RX_ADDR_P2  		D2
	nrf24_rx3_address(rx3_address);  // RX_ADDR_P3  		C3
	nrf24_rx4_address(rx4_address);  // RX_ADDR_P4  		B4
	nrf24_rx5_address(rx5_address);  // RX_ADDR_P5  		A5

	// Channel #2 , payload length: 10 
        nrf24_config(2,10);

     while(1)
    {
         if(IRQ1 == 1)
		{
			 IRQ1 = 0; 

			 if(nrf24_dataReady())
				  {
					nrf24_getData(data_array);
					  APP_PRINTF(" Antenna 1 =  ");  
					  APP_PRINTF("%s",data_array);
					APP_PRINTF("\r\n");
				  }

               }
      }
}      

void nrf24_config(uint8_t channel, uint8_t pay_length)
{
    /* Use static payload length ... */
    payload_len = pay_length;

    // Set RF channel
    nrf24_configRegister(RF_CH,channel);

    // Set length of incoming payload 
       nrf24_configRegister(RX_PW_P0, payload_len); // Auto-ACK pipe ... added
	nrf24_configRegister(RX_PW_P1, payload_len); // Data payload pipe
    nrf24_configRegister(RX_PW_P2, payload_len); // Pipe used 
    nrf24_configRegister(RX_PW_P3, payload_len); // Pipe used 
    nrf24_configRegister(RX_PW_P4, payload_len); // Pipe used 
    nrf24_configRegister(RX_PW_P5, payload_len); // Pipe used 

    // 250 Kbps, TX gain: 0dbm
	 nrf24_configRegister(RF_SETUP, 0x26);
	
    // CRC enable, 1 byte CRC length
    nrf24_configRegister(CONFIG,nrf24_CONFIG);

	nrf24_configRegister(EN_AA,(1<<ENAA_P0)|(1<<ENAA_P1)|(1<<ENAA_P2)|(1<<ENAA_P3)|(1<<ENAA_P4)|(1<<ENAA_P5));  // added

	nrf24_configRegister(EN_RXADDR,(1<<ERX_P0)|(1<<ERX_P1)|(1<<ERX_P2)|(1<<ERX_P3)|(1<<ERX_P4)|(1<<ERX_P5)); // added

	
    // Auto retransmit delay: 1000 us and Up to 15 retransmit trials
    nrf24_configRegister(SETUP_RETR,(0x04<<ARD)|(0x0F<<ARC));

    // Dynamic length configurations: No dynamic length
    nrf24_configRegister(DYNPD,(0<<DPL_P0)|(0<<DPL_P1)|(0<<DPL_P2)|(0<<DPL_P3)|(0<<DPL_P4)|(0<<DPL_P5));

    // Start listening
    nrf24_powerUpRx();
}
       

/* Set the RX address */
void nrf24_rx1_address(uint8_t * adr) 
{
    nrf24_ce_digitalWrite(LOW);
    nrf24_writeRegister(RX_ADDR_P1,adr,5);
    nrf24_ce_digitalWrite(HIGH);
}

/* Set the RX address */
void nrf24_rx2_address(uint8_t * adr) 
{
    nrf24_ce_digitalWrite(LOW);
    nrf24_writeRegister(RX_ADDR_P2,adr,1);
    nrf24_ce_digitalWrite(HIGH);
}

/* Set the RX address */
void nrf24_rx3_address(uint8_t * adr) 
{
    nrf24_ce_digitalWrite(LOW);
    nrf24_writeRegister(RX_ADDR_P3,adr,1);
    nrf24_ce_digitalWrite(HIGH);
}

/* Set the RX address */
void nrf24_rx4_address(uint8_t * adr) 
{
    nrf24_ce_digitalWrite(LOW);
    nrf24_writeRegister(RX_ADDR_P4,adr,1);
    nrf24_ce_digitalWrite(HIGH);
}

/* Set the RX address */
void nrf24_rx5_address(uint8_t * adr) 
{
    nrf24_ce_digitalWrite(LOW);
    nrf24_writeRegister(RX_ADDR_P5,adr,1);
    nrf24_ce_digitalWrite(HIGH);
}
/* Checks if data is available for reading */
/* Returns 1 if data is ready ... */
uint8_t nrf24_dataReady() 
{
    // See note in getData() function - just checking RX_DR isn't good enough
    uint8_t status = nrf24_getStatus();

    // We can short circuit on RX_DR, but if it's not set, we still need
    // to check the FIFO for any pending packets
    if ( status & (1 << RX_DR) ) 
    {
        return 1;
    }

    return !nrf24_rxFifoEmpty();;
}

/* Reads payload bytes into data array */
void nrf24_getData(uint8_t* data) 
{
    /* Pull down chip select */
    nrf24_csn_digitalWrite(LOW);                               

    /* Send cmd to read rx payload */
    SPI1_send( R_RX_PAYLOAD );
    
    /* Read payload */
    nrf24_transferSync(data,data,payload_len);
    
    /* Pull up chip select */
    nrf24_csn_digitalWrite(HIGH);

    /* Reset status register */
    nrf24_configRegister(STATUS,(1<<RX_DR));   
}

Tag code (Transmitter):

#ifdef MCU_NRF24LE1
#include "nrf24le1.h"
#include "hal_clk.h"
#endif

#ifdef MCU_NRF24LU1P
#include "nrf24lu1p.h"
#endif

#include <stdint.h>
#include <stdbool.h>
#include "cpu.h"
#include "hal_nrf.h"
#include "hal_uart.h"
#include "hal_delay.h"
#include "cklf.h"  
#include <string.h>

#ifndef MCU_NRF24LU1P
#include "hal_clk.h" //lint !e322 !e7 "include file not found"
#endif


// Global variables
static bool volatile radio_busy;
static bool volatile radio_transmit;

	uint8_t TX_addr[5] = {0xE1,0xE1,0xE1,0xE1,0xD2}; // for Tag 1
	
	uint8_t payload[10] = {'6','1','2','0','0','0','0','0','9','7'};    //payload for testing 1234567899  Tag 2
	//uint8_t payload[10] = {'1','2','3','4','4','4','4','4','5','6'};    //payload for testing 1234444456 Tag 1

		
uint16_t Buzzer_loop=0,Checkout=0;
uint8_t Fstate=0;
	
void main(void)
{	
	CLKCTL=0x80;     // system clock 16 Mhz

	
// Buzzer Configurations	
	
	P0DIR &= ~(1 << 4);  // P0.4 Buzzer as output(TP-10)
	P0 &= ~(1 << 4);     // P0.4 set LOW(Buzzer Off)
	
	
	
  #ifdef MCU_NRF24LE1
  while(hal_clk_get_16m_source() != HAL_CLK_XOSC16M)
  {
    // Wait until 16 MHz crystal oscillator is running
  }
  #endif

  #ifdef MCU_NRF24LU1P
  // Enable radio SPI
  RFCTL = 0x10U;
  #endif


  // Enable the radio clock
  RFCKEN = 1U;

  // Enable RF interrupt
  RF = 1U;

  // Enable global interrupt
  EA = 1U;

	hal_nrf_set_output_power(HAL_NRF_0DBM);    	// output power 0DBM

	hal_nrf_set_operation_mode(HAL_NRF_PTX);   		// Transmit mode
	
	hal_nrf_set_address_width(HAL_NRF_AW_5BYTES);  // Address width 5 bytes

	hal_nrf_set_address(HAL_NRF_TX,TX_addr);     	// set TX address E1
	hal_nrf_set_address(HAL_NRF_PIPE0,TX_addr);  	// set TX pipe0 E1 for Acknowledgement 

	hal_nrf_write_reg(SETUP_RETR,0x01);            	// 1 max-retransmits

	hal_nrf_set_rf_channel(2);                   	//channel 2
	
	hal_nrf_set_datarate(HAL_NRF_1MBPS);      		//data rate 1mbps
	//hal_nrf_set_datarate(HAL_NRF_250KBPS);          // data rate 250kbps
	
	// Power up radio
  hal_nrf_set_power_mode(HAL_NRF_PWR_UP);
	
  Fstate=1;
  radio_transmit = false;
		
	
	TICKDV = 0x03;
	WUIRQ = 1;  

  EA = 1U;
	
// cklf_rtc_init(0x00 , 0x3E80);  //RTC init 2 sec
 cklf_rtc_init(0x00 , 0x1F40);  //RTC init 1 sec
// cklf_rtc_init(0x00 , 0x9C40);  //RTC init 5 sec
 //P0 |= (1 << 5);      // P0.4 set High
  for(;;)
  {
		
   
	hal_nrf_set_power_mode(HAL_NRF_PWR_UP);
		
    // Write payload to radio TX FIFO
    hal_nrf_write_tx_payload(payload, 10U);
	
		
    // Toggle radio CE signal to start transmission
    CE_PULSE();

    radio_busy = true;
				
    // Wait for radio operation to finish
    while (radio_busy)
					{
						
					}
				
	 hal_nrf_set_power_mode(HAL_NRF_PWR_DOWN);		
					
		if(radio_transmit)
		{
			Checkout=0;
      radio_transmit = false;
			 if(Fstate==1)        // Buzzer Loop 2 seconds
			   {
							for(Buzzer_loop=0;Buzzer_loop<10000;Buzzer_loop++)
									{
										delay_us(100);
										P0 |= (1 << 4);      // P0.4 set High
										delay_us(100);
										P0 &= ~(1 << 4);     // P0.4 set LOW
									}
					Fstate++;	 
				}
    }
		
		else
		{
        Checkout++;
			  //delay_ms(2);
				if(Checkout >= 10)
					{
						Checkout=0;
						Fstate=1;
					}			
		}
		
		WUF = 0;          //clear interupts
		cpu_pwr_down();   //power MCU	


  }
}

// Radio interrupt
NRF_ISR()
{
  uint8_t irq_flags;

  // Read and clear IRQ flags from radio
  irq_flags = hal_nrf_get_clear_irq_flags();

  switch(irq_flags)
  {
		 
			// Transmission success
			case (1 << (uint8_t)HAL_NRF_TX_DS):
			radio_busy = false;
			radio_transmit = true;
      // Data has been sent
      break;
			// Transmission failed (maximum re-transmits)
			case (1 << (uint8_t)HAL_NRF_MAX_RT):
      // When a MAX_RT interrupt occurs the TX payload will not be removed from the TX FIFO.
      // If the packet is to be discarded this must be done manually by flushing the TX FIFO.
      // Alternatively, CE_PULSE() can be called re-starting transmission of the payload.
      // (Will only be possible after the radio irq flags are cleared)
      // hal_uart_putstring("Data write failed: ");
			hal_nrf_flush_tx();
      radio_busy = false;
      break;
			default:
      break;
  }
}

// Wake up interupt
WU_ISR()
{

}

[Hung Bui]

@Pradeep: Next time please edit your question or add comment instead of using Answer section. I haven't seen you configure the RX_ADDR_P0 in the code. It should be configured. I suspect there could be a mismatch on the order of byte (byte endianness).

You can try to test by using RX_ADDR_P1 = {0xE1, 0xE1, 0xE1, 0xE1, 0xE1}; RX_ADDR_P2 = 0xD2

and then try both: TX_addr[5] = {0xE1,0xE1,0xE1,0xE1,0xD2}; and TX_addr[5] = {0xD2,0xE1,0xE1,0xE1,0xE1};

respectively, to see if it's the case.

I don't know how you write the register with nrf24_writeRegister() but I would suggest to use hal_nrf_write_multibyte_reg() function in hal_nrf.c . Or better could you use hal_nrf_set_address() as in the example ? I suggest to test first with both side from the code from the example to make sure it works before moving to your code.

[Pradeep Chl]

Thanks for the reply. I will edit the question next time. Yes, we tried with TX_ADDR[5] = { 0xE1, 0xE1, 0xE1, 0xE1, 0xD2} and also with TX_ADDR[5] = {0xD2,0xE1,0xE1,0xE1,0xE1} on the Transmitter or Tag.

The RX_ADDR_P2 is still not receiving data from the tag.

[Hung Bui]

Have you tried: RX_ADDR_P1 = {0xE1, 0xE1, 0xE1, 0xE1, 0xE1}; ?