RE: Issue w/ nRF24L01 Tx

Håkon Alseth — Mon, 10 Mar 2014 10:28:58 GMT

Hi Bryan,

From the files that you've attached, I cannot see something that stands out. However, you are clearing the STATUS register with a constant. It is recommended that you read out the register and write back the read-content, to make sure you clear the correct bits.

Given that you need to reset the nRF to be able to change your payload (on the STM?), this indicates that there's something wrong in the handling when switching from RX->TX. Try avoiding high delays (ms-range and higher), and setup a pin-interrupt on the IRQ pin from the nRF.

Also, you can try to cut down the program, and verify that things work one step of the time. Start with a simple transmitter (no RX) on the STM side, and when you've verified that this works, add more functionality.

Best regards Håkon

RE: Issue w/ nRF24L01 Tx

Bryan — Thu, 06 Mar 2014 20:08:30 GMT

Here is the code being used on the Arduino side:


#include <SPI.h>
#include <Mirf.h>
#include <nRF24L01.h>
#include <MirfHardwareSpiDriver.h>

void setup(){
  Serial.begin(9600);
  Mirf.spi = &MirfHardwareSpi;
  Mirf.init();
  Mirf.setRADDR((byte *)"clie1");
  Mirf.payload = sizeof(unsigned long);  // 4 bytes
  Mirf.config();
  Serial.println("Beginning ... "); 
}

unsigned long data;

void loop(){ 
  while(!Mirf.dataReady());
  
  Mirf.getData((byte *) &data);
   
  Serial.println(data, HEX); 
}

(the Mirf library being used has been attached as well)

On the STM32 side I have the following:

#include "stm32f4_discovery.h"
#include <stdio.h>
#include "nRF24L01P.h"

#define ADR_WIDTH 5
#define RX_PLOAD_WIDTH 4
#define TX_PLOAD_WIDTH 4

unsigned char Tx_Buf[4] = {0xAA,0xAA,0xAA,0xAA};
unsigned char Tx_Buf2[4] = {0xBB,0xBB,0xBB,0xBB};

int state = 0;

int main (void) {
	nRF24L01_HW_Init();
	RX_Mode();
	Delay(10000);

	while (1) {
		
		if (i % 100000 == 0) {
		  state = !state;
		}
		
		if (state) {
	                nRF24L01_TxPacket(Tx_Buf);
		} else {
			nRF24L01_TxPacket(Tx_Buf2);
		}
		RX_Mode();
		Delay(1000);
		}
	}
}

void nRF24L01_TxPacket(unsigned char * tx_buf) {
        nRF24L01_CE_L();
	 	
	SPI_WR_Reg(WRITE_nRF_REG + NRFRegSTATUS, 0x30);
	nRF24L01_Delay_us(20);
	SPI_WR_Reg(WRITE_nRF_REG + CONFIG, 0x3A);
	nRF24L01_Delay_us(20);
	nRF24L01_SPI_NSS_L();  
	nRF24L01_SPI_Send_Byte(FLUSH_TX);
	nRF24L01_SPI_NSS_H();  
	nRF24L01_Delay_us(20);
	SPI_Write_Buf(WR_TX_PLOAD, tx_buf, TX_PLOAD_WIDTH);
	nRF24L01_Delay_us(20);
        
        nRF24L01_CE_H();
	nRF24L01_Delay_us(20);
        nRF24L01_CE_L();
}

void RX_Mode(void) {
        nRF24L01_CE_L();
	SPI_WR_Reg(WRITE_nRF_REG + CONFIG, 0x39);
	nRF24L01_Delay_us(20);
	
	SPI_WR_Reg(WRITE_nRF_REG + RF_CH,0x01);
	nRF24L01_Delay_us(20);
	SPI_WR_Reg(WRITE_nRF_REG + RX_PW_P0,4);
	nRF24L01_Delay_us(20);
	SPI_WR_Reg(WRITE_nRF_REG + RX_PW_P1,4);
	nRF24L01_Delay_us(20);
	SPI_WR_Reg(WRITE_nRF_REG + EN_RXADDR, 0x03);
	nRF24L01_Delay_us(20);
	SPI_Write_Buf(WRITE_nRF_REG + TX_ADDR, TX_ADDRESS, ADR_WIDTH);
	nRF24L01_Delay_us(20);
	SPI_Write_Buf(WRITE_nRF_REG + RX_ADDR_P0, TX_ADDRESS, ADR_WIDTH); 
	nRF24L01_Delay_us(20);
	SPI_Write_Buf(WRITE_nRF_REG + RX_ADDR_P1, RX_ADDRESS, ADR_WIDTH); 
	nRF24L01_Delay_us(20);
	
	SPI_WR_Reg(WRITE_nRF_REG + CONFIG, 0x33);
	nRF24L01_Delay_us(20);
        nRF24L01_CE_H();
	nRF24L01_Delay_us(2000);
}

I appreciate the help (and apologize the code is a bit sloppy)

Bryan

Mirf.zip

RE: Issue w/ nRF24L01 Tx

Håkon Alseth — Thu, 06 Mar 2014 11:32:16 GMT

Hi Bryan,

Can you post more detailed code on both sides? It's hard to tell what can be wrong here, as it may be a problem in the transmission or the reception.

Best regards Håkon