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Topic: NRF24L01 Transceiver Module - HELP! (Read 1 time) previous topic - next topic

uobstudent

Feb 22, 2015, 03:05 am Last Edit: Feb 22, 2015, 03:10 am by uobstudent
Ive got two transciever modules connected to two different NANO boards and I cant get the maniac bug getting started script to run. Ive verfified voltages on the modules. I've checked the connections and as far as I can guess they're correct. I'm not sure if the library is installed correctly as if i change the "something.h" to <something.h> but despite numerous downloads and re installs of this library and other RF24 libraries I cant get it to function. Ideally I'm looking to use a different library eventually to enable connection to Raspberry Pi, but for now this should be enough to test my connections between arduino boards.


This is the code:
Code: [Select]
/*
 Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 version 2 as published by the Free Software Foundation.
 */

/**
 * Example for Getting Started with nRF24L01+ radios.
 *
 * This is an example of how to use the RF24 class.  Write this sketch to two
 * different nodes.  Put one of the nodes into 'transmit' mode by connecting
 * with the serial monitor and sending a 'T'.  The ping node sends the current
 * time to the pong node, which responds by sending the value back.  The ping
 * node can then see how long the whole cycle took.
 */

#include <SPI.h>
#include "nRF24L01.h"
#include "RF24.h"
#include "printf.h"

//
// Hardware configuration
//

// Set up nRF24L01 radio on SPI bus plus pins 9 & 10

RF24 radio(9,10);

//
// Topology
//

// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xF0F0F0F0E1LL, 0xF0F0F0F0D2LL };

//
// Role management
//
// Set up role.  This sketch uses the same software for all the nodes
// in this system.  Doing so greatly simplifies testing. 
//

// The various roles supported by this sketch
typedef enum { role_ping_out = 1, role_pong_back } role_e;

// The debug-friendly names of those roles
const char* role_friendly_name[] = { "invalid", "Ping out", "Pong back"};

// The role of the current running sketch
role_e role = role_pong_back;

void setup(void)
{
  //
  // Print preamble
  //

  Serial.begin(57600);
  printf_begin();
  printf("\n\rRF24/examples/GettingStarted/\n\r");
  printf("ROLE: %s\n\r",role_friendly_name[role]);
  printf("*** PRESS 'T' to begin transmitting to the other node\n\r");

  //
  // Setup and configure rf radio
  //

  radio.begin();

  // optionally, increase the delay between retries & # of retries
  radio.setRetries(15,15);

  // optionally, reduce the payload size.  seems to
  // improve reliability
  //radio.setPayloadSize(8);

  //
  // Open pipes to other nodes for communication
  //

  // This simple sketch opens two pipes for these two nodes to communicate
  // back and forth.
  // Open 'our' pipe for writing
  // Open the 'other' pipe for reading, in position #1 (we can have up to 5 pipes open for reading)

  //if ( role == role_ping_out )
  {
    //radio.openWritingPipe(pipes[0]);
    radio.openReadingPipe(1,pipes[1]);
  }
  //else
  {
    //radio.openWritingPipe(pipes[1]);
    //radio.openReadingPipe(1,pipes[0]);
  }

  //
  // Start listening
  //

  radio.startListening();

  //
  // Dump the configuration of the rf unit for debugging
  //

  radio.printDetails();
}

void loop(void)
{
  //
  // Ping out role.  Repeatedly send the current time
  //

  if (role == role_ping_out)
  {
    // First, stop listening so we can talk.
    radio.stopListening();

    // Take the time, and send it.  This will block until complete
    unsigned long time = millis();
    printf("Now sending %lu...",time);
    bool ok = radio.write( &time, sizeof(unsigned long) );
   
    if (ok)
      printf("ok...");
    else
      printf("failed.\n\r");

    // Now, continue listening
    radio.startListening();

    // Wait here until we get a response, or timeout (250ms)
    unsigned long started_waiting_at = millis();
    bool timeout = false;
    while ( ! radio.available() && ! timeout )
      if (millis() - started_waiting_at > 200 )
        timeout = true;

    // Describe the results
    if ( timeout )
    {
      printf("Failed, response timed out.\n\r");
    }
    else
    {
      // Grab the response, compare, and send to debugging spew
      unsigned long got_time;
      radio.read( &got_time, sizeof(unsigned long) );

      // Spew it
      printf("Got response %lu, round-trip delay: %lu\n\r",got_time,millis()-got_time);
    }

    // Try again 1s later
    delay(1000);
  }

  //
  // Pong back role.  Receive each packet, dump it out, and send it back
  //

  if ( role == role_pong_back )
  {
    // if there is data ready
    if ( radio.available() )
    {
      // Dump the payloads until we've gotten everything
      unsigned long got_time;
      bool done = false;
      while (!done)
      {
        // Fetch the payload, and see if this was the last one.
        done = radio.read( &got_time, sizeof(unsigned long) );

        // Spew it
        printf("Got payload %lu...",got_time);

// Delay just a little bit to let the other unit
// make the transition to receiver
delay(20);
      }

      // First, stop listening so we can talk
      radio.stopListening();

      // Send the final one back.
      radio.write( &got_time, sizeof(unsigned long) );
      printf("Sent response.\n\r");

      // Now, resume listening so we catch the next packets.
      radio.startListening();
    }
  }

  //
  // Change roles
  //

  if ( Serial.available() )
  {
    char c = toupper(Serial.read());
    if ( c == 'T' && role == role_pong_back )
    {
      printf("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK\n\r");

      // Become the primary transmitter (ping out)
      role = role_ping_out;
      radio.openWritingPipe(pipes[0]);
      radio.openReadingPipe(1,pipes[1]);
    }
    else if ( c == 'R' && role == role_ping_out )
    {
      printf("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK\n\r");
     
      // Become the primary receiver (pong back)
      role = role_pong_back;
      radio.openWritingPipe(pipes[1]);
      radio.openReadingPipe(1,pipes[0]);
    }
  }
}
// vim:cin:ai:sts=2 sw=2 ft=cpp


This is what the serial monitor returns:
ù×Ö°MÖ…
ø…Á…Á…ÁÅÁÒÃ…Á…Ò…
ù…ÒM-°B²B²Â°ßÖ…
ù…ÒÒÁBÂÒÁÅÁ…Ò…Á…
øM-â°âÖâÖ×Ö…éë2Æü°B²DÂÒÁÒÁÒÃÒÃBÂB²]Ö…
øM-×ÖB²Â°B²TÂÒÁÒÁÒÁÒÁBÂB²]Ö…
øM-°B²Â°B²ÒÃåÁ…Hÿ…Hÿ…HÿÒÁBÂB²×Ö…
øMÖ°×Ö°BºTÂÅAÇÿ"3ùÅÁ…FiÿÒÁöÅÁ…Hÿ…
ø…
ø…Ò…
ùâÖ°]Ö…
ø…Hÿ…Hÿ…HÿÅÁÅÁ…ÒM-ßÖ]Ö°B²DÂDÂBÂBÂBºBºB²]Ö…
øMÖ°×Ö°BºTÂÒÁÒÁTÂB²âÖ…
ù…ÒÒAÇÿcÿDÂBBÿ6ÆüB²Â°M-…ÒÅÁÒÃBºBÂÒÁÒÃåÁ…Ò…
ù×Ö]Ö]Ö…
ø…ÁÒÃBºÂ°B²BÂB²DÂåÁ…Hÿ…
øÅÁÒÃBºBºBºBºB²BÂÒÁÅÁBÂBÂÒÁÅÁÒÃBºÂ°M-…BkÿÅÿ…ÒÅAGÿBºBºBºBºTÂB°B²TÂÒÁ…ÒÒÁBºÂ°]Ö…
øÅÁÒÃÅÁ…Ò…

nightsd01

Are you sure you changed the baud rate on the serial monitor to 57600? By default I believe it's at 9600.

uobstudent

#2
Feb 22, 2015, 03:36 pm Last Edit: Feb 22, 2015, 07:44 pm by uobstudent
I've managed to get them to display on the monitor but they wont communicate, they always give  a timeout error.
Any ideas why?

This is their configs in the serial monitor.



Should the RX and TX addresses be the same? The same code was uploaded on both.

uobstudent


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