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/*
Copyright (C) 2011 James Coliz, Jr. <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 using Dynamic Payloads * * This is an example of how to use payloads of a varying (dynamic) size. */
#include <SPI.h>
#include "RF24.h"
//
// Hardware configuration
//
// Set up nRF24L01 radio on SPI bus plus pins 8 & 9
RF24 radio(8,9);
// Use multicast?
// sets the multicast behavior this unit in hardware. Connect to GND to use unicast
// Leave open (default) to use multicast.
const int multicast_pin = 6 ;
// sets the role of this unit in hardware. Connect to GND to be the 'pong' receiver
// Leave open to be the 'ping' transmitter
const int role_pin = 7; bool multicast = true ;
//
// Topology
//
// Radio pipe addresses for the 2 nodes to communicate.
const uint64_t pipes[2] = { 0xEEFAFDFDEELL, 0xEEFDFAF50DFLL };
//
// Role management
//
// Set up role. This sketch uses the same software for all the nodes
// in this system. Doing so greatly simplifies testing. The hardware itself specifies
// which node it is.
//
// This is done through the role_pin
//
// 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;
//
// Payload
//
const int min_payload_size = 1; const int max_payload_size = 32; const int payload_size_increments_by = 1; int next_payload_size = min_payload_size;
char receive_payload[max_payload_size+1]; // +1 to allow room for a terminating NULL char
void setup(void) { //
// Multicast
//
pinMode(multicast_pin, INPUT); digitalWrite(multicast_pin,HIGH); delay( 20 ) ;
// read multicast role, LOW for unicast
if( digitalRead( multicast_pin ) ) multicast = true ; else multicast = false ;
//
// Role
//
// set up the role pin
pinMode(role_pin, INPUT); digitalWrite(role_pin,HIGH); delay( 20 ); // Just to get a solid reading on the role pin
// read the address pin, establish our role
if ( digitalRead(role_pin) ) role = role_ping_out; else role = role_pong_back;
//
// Print preamble
//
Serial.begin(115200); Serial.println(F("RF24/examples/pingpair_multi_dyn/")); Serial.print(F("ROLE: ")); Serial.println(role_friendly_name[role]); Serial.print(F("MULTICAST: ")); Serial.println(multicast ? F("true (unreliable)") : F("false (reliable)")); //
// Setup and configure rf radio
//
radio.begin();
// enable dynamic payloads
radio.enableDynamicPayloads(); radio.setCRCLength( RF24_CRC_16 ) ;
// optionally, increase the delay between retries & # of retries
radio.setRetries( 15, 5 ) ; radio.setAutoAck( true ) ; //radio.setPALevel( RF24_PA_LOW ) ;
//
// 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.powerUp() ; 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) { // The payload will always be the same, what will change is how much of it we send.
static char send_payload[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ789012";
// First, stop listening so we can talk.
radio.stopListening();
// Take the time, and send it. This will block until complete
Serial.print(F("Now sending length ")); Serial.println(next_payload_size); radio.write( send_payload, next_payload_size, multicast );
// Now, continue listening
radio.startListening();
// Wait here until we get a response, or timeout
unsigned long started_waiting_at = millis(); bool timeout = false; while ( ! radio.available() && ! timeout ) if (millis() - started_waiting_at > 500 ) timeout = true;
// Describe the results
if ( timeout ) { Serial.println(F("Failed, response timed out.")); } else { // Grab the response, compare, and send to debugging spew
uint8_t len = radio.getDynamicPayloadSize(); radio.read( receive_payload, len );
// Put a zero at the end for easy printing
receive_payload[len] = 0;
// Spew it
Serial.print(F("Got response size=")); Serial.print(len); Serial.print(F(" value=")); Serial.println(receive_payload); } // Update size for next time.
next_payload_size += payload_size_increments_by; if ( next_payload_size > max_payload_size ) next_payload_size = min_payload_size;
// Try again 1s later
delay(250); }
//
// 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
uint8_t len; bool done = false; while (radio.available()) { // Fetch the payload, and see if this was the last one.
len = radio.getDynamicPayloadSize(); radio.read( receive_payload, len );
// Put a zero at the end for easy printing
receive_payload[len] = 0;
// Spew it
Serial.print(F("Got response size=")); Serial.print(len); Serial.print(F(" value=")); Serial.println(receive_payload); }
// First, stop listening so we can talk
radio.stopListening();
// Send the final one back.
radio.write( receive_payload, len, multicast ); Serial.println(F("Sent response."));
// Now, resume listening so we catch the next packets.
radio.startListening(); } } } // vim:cin:ai:sts=2 sw=2 ft=cpp
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