HamShield/examples/AX25Receive/AX25Receive.ino

#include <HamShield.h>

#define PWM_PIN 3
#define RESET_PIN A3
#define SWITCH_PIN 2

HamShield radio;
DDS dds;

void setup() {
  // NOTE: if not using PWM out, it should be held low to avoid tx noise
  pinMode(PWM_PIN, OUTPUT);
  digitalWrite(PWM_PIN, LOW);
  
  // prep the switch
  pinMode(SWITCH_PIN, INPUT_PULLUP);
  
  // set up the reset control pin
  pinMode(RESET_PIN, OUTPUT);
  // turn on radio
  digitalWrite(RESET_PIN, HIGH);
  
  Serial.begin(9600);

  Serial.println(F("Radio test connection"));
  Serial.println(radio.testConnection(), DEC);
  Serial.println(F("Initialize"));
  delay(100);
  radio.initialize();
  radio.frequency(145010);
  radio.setSQOff();
  I2Cdev::writeWord(A1846S_DEV_ADDR_SENLOW, 0x44, 0b11111111);
  Serial.println(F("Frequency"));
  delay(100);
  Serial.print(F("Squelch(H/L): "));
  Serial.print(radio.getSQHiThresh());
  Serial.print(F(" / "));
  Serial.println(radio.getSQLoThresh());
  radio.setModeReceive();
  Serial.print(F("RX? "));
  Serial.println(radio.getRX());
  Serial.println(F("DDS Start"));
  delay(100);
  dds.start();
  Serial.println(F("AFSK start"));
  delay(100);
  radio.afsk.start(&dds);
  Serial.println(F("Starting..."));
  delay(100);
  dds.setAmplitude(255);
}

uint32_t last = 0;
void loop() {
   if(radio.afsk.decoder.read() || radio.afsk.rxPacketCount()) {
      // A true return means something was put onto the packet FIFO
      // If we actually have data packets in the buffer, process them all now
      while(radio.afsk.rxPacketCount()) {
        AFSK::Packet *packet = radio.afsk.getRXPacket();
        Serial.print(F("Packet: "));
        if(packet) {
          packet->printPacket(&Serial);
          AFSK::PacketBuffer::freePacket(packet);
        }
      }
    }
}

//TODO: d2 is the switch input, so remove this
ISR(ADC_vect) {
  static uint8_t tcnt = 0;
  TIFR1 = _BV(ICF1); // Clear the timer flag
  //PORTD |= _BV(2); // Diagnostic pin (D2)
  //dds.clockTick();
  radio.afsk.timer();
  //PORTD &= ~(_BV(2)); // Pin D2 off again
}