1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

NRF24L01 writing fail

Discussion in 'Programming/Internet' started by Mart, Oct 8, 2018.

  1. Mart

    Mart Guest

    My arduino uno with the NRF24L01 combination gives failed messages on writing.

    Using the basic example code 'getting started' literally copied from: http://tmrh20.github.io/RF24/GettingStarted_8ino-example.html, my serial monitor constantly writes 'failed' (See attached screenshot)

    The setup is for my Arduino uno as described in the table on http://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo#PP (Arduino pin for TMRh20 RF24 Library)

    The code:

    /*
    * Getting Started example sketch for nRF24L01+ radios
    * This is a very basic example of how to send data from one node to another
    * Updated: Dec 2014 by TMRh20
    */
    #include <SPI.h>
    #include "RF24.h"
    #include <printf.h>

    /****************** User Config ***************************/
    /*** Set this radio as radio number 0 or 1 ***/
    bool radioNumber = 1;
    /* Hardware configuration: Set up nRF24L01 radio on SPI bus plus pins 7 & 8 */
    RF24 radio(7,8);
    /**********************************************************/
    byte addresses[][6] = {"1Node","2Node"};
    // Used to control whether this node is sending or receiving
    bool role = 0;
    void setup() {
    Serial.begin(115200);
    printf_begin();
    Serial.println(F("RF24/examples/GettingStarted"));
    Serial.println(F("*** PRESS 'T' to begin transmitting to the other node"));

    radio.begin();
    // Set the PA Level low to prevent power supply related issues since this is a
    // getting_started sketch, and the likelihood of close proximity of the devices. RF24_PA_MAX is default.
    radio.setPALevel(RF24_PA_LOW);

    // Open a writing and reading pipe on each radio, with opposite addresses
    if(radioNumber){
    radio.openWritingPipe(addresses[1]);
    radio.openReadingPipe(1,addresses[0]);
    }else{
    radio.openWritingPipe(addresses[0]);
    radio.openReadingPipe(1,addresses[1]);
    }
    radio.printDetails();
    // Start the radio listening for data
    radio.startListening();
    }
    void loop() {


    /****************** Ping Out Role ***************************/
    if (role == 1) {

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


    Serial.println(F("Now sending"));
    unsigned long start_time = micros(); // Take the time, and send it. This will block until complete
    if (!radio.write( &start_time, sizeof(unsigned long) )){
    Serial.println(F("failed"));
    }

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

    unsigned long started_waiting_at = micros(); // Set up a timeout period, get the current microseconds
    boolean timeout = false; // Set up a variable to indicate if a response was received or not

    while ( ! radio.available() ){ // While nothing is received
    if (micros() - started_waiting_at > 200000 ){ // If waited longer than 200ms, indicate timeout and exit while loop
    timeout = true;
    break;
    }
    }

    if ( timeout ){ // Describe the results
    Serial.println(F("Failed, response timed out."));
    }else{
    unsigned long got_time; // Grab the response, compare, and send to debugging spew
    radio.read( &got_time, sizeof(unsigned long) );
    unsigned long end_time = micros();

    // Spew it
    Serial.print(F("Sent "));
    Serial.print(start_time);
    Serial.print(F(", Got response "));
    Serial.print(got_time);
    Serial.print(F(", Round-trip delay "));
    Serial.print(end_time-start_time);
    Serial.println(F(" microseconds"));
    }
    // Try again 1s later
    delay(1000);
    }
    /****************** Pong Back Role ***************************/
    if ( role == 0 )
    {
    unsigned long got_time;

    if( radio.available()){
    // Variable for the received timestamp
    while (radio.available()) { // While there is data ready
    radio.read( &got_time, sizeof(unsigned long) ); // Get the payload
    }

    radio.stopListening(); // First, stop listening so we can talk
    radio.write( &got_time, sizeof(unsigned long) ); // Send the final one back.
    radio.startListening(); // Now, resume listening so we catch the next packets.
    Serial.print(F("Sent response "));
    Serial.println(got_time);
    }
    }
    /****************** Change Roles via Serial Commands ***************************/
    if ( Serial.available() )
    {
    char c = toupper(Serial.read());
    if ( c == 'T' && role == 0 ){
    Serial.println(F("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK"));
    role = 1; // Become the primary transmitter (ping out)

    }else
    if ( c == 'R' && role == 1 ){
    Serial.println(F("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK"));
    role = 0; // Become the primary receiver (pong back)
    radio.startListening();

    }
    }
    } // Loop


    While my other arduino has the same setup only radioNumber = 0 on that one.

    The monitor output: [​IMG]

    My setup: [​IMG]

    EDIT: Ok so i managed to run printDetails() (thanks for the help on that one) This came up with:

    STATUS = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
    RX_ADDR_P0-1 = 0x65646f4e31 0x65646f4e32
    RX_ADDR_P2-5 = 0xc3 0xc4 0xc5 0xc6
    TX_ADDR = 0x65646f4e31
    RX_PW_P0-6 = 0x20 0x20 0x00 0x00 0x00 0x00
    EN_AA = 0x3f
    EN_RXADDR = 0x02
    RF_CH = 0x4c
    RF_SETUP = 0x03
    CONFIG = 0x0e
    DYNPD/FEATURE = 0x00 0x00
    Data Rate = 1MBPS
    Model = nRF24L01+
    CRC Length = 16 bits
    PA Power = PA_LOW


    on arduino one, and with the following on arduino 2 with radionumber = 1

    STATUS = 0x0e RX_DR=0 TX_DS=0 MAX_RT=0 RX_P_NO=7 TX_FULL=0
    RX_ADDR_P0-1 = 0x65646f4e32 0x65646f4e31
    RX_ADDR_P2-5 = 0xc3 0xc4 0xc5 0xc6
    TX_ADDR = 0x65646f4e32
    RX_PW_P0-6 = 0x20 0x20 0x00 0x00 0x00 0x00
    EN_AA = 0x3f
    EN_RXADDR = 0x02
    RF_CH = 0x4c
    RF_SETUP = 0x03
    CONFIG = 0x0e
    DYNPD/FEATURE = 0x00 0x00
    Data Rate = 1MBPS
    Model = nRF24L01+
    CRC Length = 16 bits
    PA Power = PA_LOW

    Login To add answer/comment
     

Share This Page