AVR Freaks

//>>> The latest version of this code can be found at https://github.com/jcw/ !!

// Demo of a sketch which sends and receives packets
// 2010-05-17  http://opensource.org/licenses/mit-license.php
// $Id: pingPong.pde 7763 2011-12-11 01:28:16Z jcw $

// with thanks to Peter G for creating a test sketch and pointing out the issue
// see http://news.jeelabs.org/2010/05/20/a-subtle-rf12-detail/

#include 
#include 

Port leds (1);
MilliTimer sendTimer;
char payload[] = "Hello";
byte needToSend;

static void sendLed (byte on) {
    leds.mode(OUTPUT);
    leds.digiWrite(on);
}

static void receiveLed (byte on) {
    leds.mode2(OUTPUT);
    leds.digiWrite2(!on); // inverse, because LED is tied to VCC
}

void setup () {
    Serial.begin(9600);
    Serial.println(9600);
    Serial.println("Send and Receive...");
    rf12_initialize(2, RF12_433MHZ, 33);
}

void loop () {
    if (rf12_recvDone() && rf12_crc == 0) {
        //receiveLed(1);
        Serial.print("OK ");
        for (byte i = 0; i < rf12_len; ++i)
            Serial.print(rf12_data[i]);
        Serial.println();
        delay(100); // otherwise led blinking isn't visible
        //receiveLed(0);
    }
    
    if (sendTimer.poll(2000))
        needToSend = 1;

    if (needToSend && rf12_canSend()) {
        needToSend = 0;
        
        //sendLed(1);
        rf12_sendStart(0, payload, sizeof payload);
        delay(100); // otherwise led blinking isn't visible
        //sendLed(0);
    }
}