STM32 and NRF send & receive

Question

This is my send and receive code in STM32 (blue board). But i can't send and receive data . why? I did use Enrf24.h . Enrf24 link: https://github.com/spirilis/Enrf24 send code is:

#include <SPI.h>
#include <Enrf24.h>
#include <nRF24L01.h>
#include <string.h>
#define ce_nrf PB12
#define csn_nrf PB13
#define irq_nrf PA0
Enrf24 radio(ce_nrf, csn_nrf, irq_nrf);  // P2.0=CE, P2.1=CSN, P2.2=IRQ
const uint8_t txaddr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0x01 };
void setup() {
  Serial.begin(9600);
  SPI.begin();
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  radio.begin();  // Defaults 1Mbps, channel 0, max TX power
  radio.setTXaddress((void*)txaddr);
}

void loop() {
  Serial.print("Sending packet: ");
  radio.print("OONN");
  radio.flush();  // Force transmit (don't wait for any more data)
  delay(1000);
  Serial.print("Sending packet: ");
  radio.print("OOFF");
  radio.flush();
  delay(1000);
}

receive code is:

#include <SPI.h>
#include <Enrf24.h>
#include <nRF24L01.h>
#define ce_nrf PB12
#define csn_nrf PB13
#define irq_nrf PA0
Enrf24 radio(ce_nrf, csn_nrf, irq_nrf);  // P2.0=CE, P2.1=CSN, P2.2=IRQ
const uint8_t rxaddr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0x01 };
const char *str_on = "ON";
const char *str_off = "OFF";
void dump_radio_status_to_serialport(uint8_t);
void setup() {
  Serial.begin(9600);
  SPI.begin();
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  radio.begin();  // Defaults 1Mbps, channel 0, max TX power
  radio.setRXaddress((void*)rxaddr);
  radio.enableRX();  // Start listening
}

void loop() {
  char inbuf[33];
  while (!radio.available(true));
  if (radio.read(inbuf)) {
    Serial.print("Received packet: ");
    Serial.println(inbuf);
  }
}

this image can help :

Thanks, i can't send and receive data . why? please see my image — m-tech
– m-tech, Commented Nov 8, 2018 at 12:02

Majenko · Accepted Answer · 2018-11-17 23:54:47Z

0

You did not say which library you are using, but based on the #includes, I am assuming http://maniacbug.github.io/RF24

This line in your receiver code:

  while (!radio.available(true));

does not make sense. You are passing true to the radio.available() function, but the function does not care about a parameter.

You probably mean something like:

while (!radio.available());

When you pass in a variable, you are calling a variant of the function that expects a pipe number to be given, and true is defined as 1. Your transmitter, however, is not sending on pipe number 1.

edited Nov 17, 2018 at 23:54

Majenko

106k5 gold badges82 silver badges139 bronze badges

answered Nov 8, 2018 at 13:48

jose can u c

6,9742 gold badges17 silver badges27 bronze badges

I use this library link . in exmaple folder you can see some example i did use Enrf24

m-tech
– m-tech

2018-11-08 14:34:43 +00:00
Commented Nov 8, 2018 at 14:34

Add a comment |

m-tech · Accepted Answer · 2018-11-08 15:26:48Z

0

First of all, remove

while (!radio.available(true));

after that use

PA_5 ----> SCK
PA_6 ----> MISO
PA_7 ----> MOSI

it will work correctly.

answered Nov 8, 2018 at 15:26

m-tech

1033 bronze badges

Add a comment |

m-tech · Accepted Answer · 2018-11-16 09:37:19Z

It is better answer for some reseans in Enrf library you can not send data with write untill txbuf_len==0

size_t Enrf24::write(uint8_t c) {
if (txbuf_len == 32) { flush(); // Blocking OTA TX } txbuf[txbuf_len] = c; txbuf_len++; return 1; }

dont use purge then

txbuf_len = 0

this is for read dat

#include <SPI.h>
#include <Enrf24.h>
#include <nRF24L01.h>
#define ce_nrf PB12
#define csn_nrf PB13
#define irq_nrf PA0
Enrf24 radio(ce_nrf, csn_nrf, irq_nrf);  // P2.0=CE, P2.1=CSN, P2.2=IRQ
const uint8_t rxaddr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0x01 };
const char *str_on = "ON";
const char *str_off = "OFF";
void dump_radio_status_to_serialport(uint8_t);
void setup() {
  Serial.begin(9600);
  SPI.begin();
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  radio.begin();  // Defaults 1Mbps, channel 0, max TX power
  radio.setRXaddress((void*)rxaddr);
  radio.enableRX();  // Start listening
 // radio.autoAck(false);
}

void loop() {
  char inbuf[35];
  if (radio.read(inbuf))
  {
    Serial.print("Received packet: ");
    Serial.println(inbuf);
  } 
}

this is write for write data:

#include <SPI.h>
#include <Enrf24.h>
#include <nRF24L01.h>
#include <string.h>
#define ce_nrf PB12
#define csn_nrf PB13
#define irq_nrf PA0
Enrf24 radio(ce_nrf, csn_nrf, irq_nrf);  // P2.0=CE, P2.1=CSN, P2.2=IRQ
const uint8_t txaddr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0x01 };
void setup() {
  Serial.begin(9600);
  SPI.begin();
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(MSBFIRST);
  radio.begin();  // Defaults 1Mbps, channel 0, max TX power
  radio.setTXaddress((void*)txaddr);
}
int i=0;
void loop() {
  i++;
  Serial.print("Sending packet: ");
  Serial.println(i);
  radio.print("1234567890123456789012--------->");
  //radio.purge();
  delay(100);
}

what is in principle the difference between the code in question an code in answer? only the removed while (available)? — Juraj
– Juraj ♦, Commented Nov 16, 2018 at 15:03

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