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Henrik Ekblad
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/*
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Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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//2014 - TMRh20 - Updated along with Optimized RF24 Library fork
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*/
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/**
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* Example for Getting Started with nRF24L01+ radios.
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*
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* This is an example of how to use the RF24 class to communicate on a basic level. Write this sketch to two
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* different nodes. Put one of the nodes into 'transmit' mode by connecting with the serial monitor and
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* sending a 'T'. The ping node sends the current time to the pong node, which responds by sending the value
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* back. The ping node can then see how long the whole cycle took.
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* Note: For a more efficient call-response scenario see the GettingStarted_CallResponse.ino example.
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* Note: When switching between sketches, the radio may need to be powered down to clear settings that are not "un-set" otherwise
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*/
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#include <SPI.h>
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#include "nRF24L01.h"
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#include "RF24.h"
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#include "printf.h"
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// Hardware configuration: Set up nRF24L01 radio on SPI bus plus pins 9 & 10
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RF24 radio(7,8);
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const uint64_t addresses[2] = { 0xABCDABCD71LL, 0x544d52687CLL }; // Radio pipe addresses for the 2 nodes to communicate.
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// Set up roles to simplify testing
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boolean role; // The main role variable, holds the current role identifier
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boolean role_ping_out = 1, role_pong_back = 0; // The two different roles.
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void setup() {
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Serial.begin(57600);
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printf_begin();
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printf("\n\rRF24/examples/GettingStarted/\n\r");
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printf("*** PRESS 'T' to begin transmitting to the other node\n\r");
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// Setup and configure rf radio
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radio.begin(); // Start up the radio
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radio.setAutoAck(1); // Ensure autoACK is enabled
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radio.setRetries(15,15); // Max delay between retries & number of retries
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radio.openWritingPipe(addresses[1]); // Open a writing pipe on pipe 0, with address 1
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radio.openReadingPipe(1,addresses[0]); // Open a reading pipe on pipe 1, with address 0
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radio.startListening(); // Start listening
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radio.printDetails(); // Dump the configuration of the rf unit for debugging
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}
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void loop(void){
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/****************** Ping Out Role ***************************/
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if (role == role_ping_out) {
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radio.stopListening(); // First, stop listening so we can talk.
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printf("Now sending \n\r");
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unsigned long time = micros(); // Take the time, and send it. This will block until complete
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if (!radio.write( &time, sizeof(unsigned long) )){ printf("failed.\n\r"); }
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radio.startListening(); // Now, continue listening
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unsigned long started_waiting_at = micros(); // Set up a timeout period, get the current microseconds
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boolean timeout = false; // Set up a variable to indicate if a response was received or not
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while ( ! radio.available() ){ // While nothing is received
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if (micros() - started_waiting_at > 200000 ){ // If waited longer than 200ms, indicate timeout and exit while loop
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timeout = true;
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break;
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}
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}
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if ( timeout ){ // Describe the results
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printf("Failed, response timed out.\n\r");
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}else{
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unsigned long got_time; // Grab the response, compare, and send to debugging spew
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radio.read( &got_time, sizeof(unsigned long) );
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// Spew it
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printf("Sent %lu, Got response %lu, round-trip delay: %lu microseconds\n\r",time,got_time,micros()-got_time);
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}
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// Try again 1s later
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delay(1000);
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}
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/****************** Pong Back Role ***************************/
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if ( role == role_pong_back )
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{
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if( radio.available()){
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unsigned long got_time; // Variable for the received timestamp
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while (radio.available()) { // While there is data ready
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radio.read( &got_time, sizeof(unsigned long) ); // Get the payload
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}
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radio.stopListening(); // First, stop listening so we can talk
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radio.write( &got_time, sizeof(unsigned long) ); // Send the final one back.
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radio.startListening(); // Now, resume listening so we catch the next packets.
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printf("Sent response %lu \n\r", got_time);
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}
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}
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/****************** Change Roles via Serial Commands ***************************/
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if ( Serial.available() )
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{
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char c = toupper(Serial.read());
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if ( c == 'T' && role == role_pong_back )
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{
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printf("*** CHANGING TO TRANSMIT ROLE -- PRESS 'R' TO SWITCH BACK\n\r");
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role = role_ping_out; // Become the primary transmitter (ping out)
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radio.openWritingPipe(addresses[0]);
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radio.openReadingPipe(1,addresses[1]);
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}
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else if ( c == 'R' && role == role_ping_out )
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{
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printf("*** CHANGING TO RECEIVE ROLE -- PRESS 'T' TO SWITCH BACK\n\r");
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role = role_pong_back; // Become the primary receiver (pong back)
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radio.openWritingPipe(addresses[1]);
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radio.openReadingPipe(1,addresses[0]);
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}
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}
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}
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@@ -0,0 +1,37 @@
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/*
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Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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version 2 as published by the Free Software Foundation.
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*/
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/**
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* @file printf.h
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*
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* Setup necessary to direct stdout to the Arduino Serial library, which
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* enables 'printf'
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*/
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#ifndef __PRINTF_H__
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#define __PRINTF_H__
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#ifdef ARDUINO
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int serial_putc( char c, FILE * )
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{
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Serial.write( c );
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return c;
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}
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void printf_begin(void)
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{
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fdevopen( &serial_putc, 0 );
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}
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#else
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#error This example is only for use on Arduino.
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#endif // ARDUINO
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#endif // __PRINTF_H__
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