HamShield/examples/AFSK-PacketTester/AFSK-PacketTester.ino

/* Serial glue to send messages over APRS 
 *  
 *  To do: add message receive code
 *  
 */


#define DDS_REFCLK_DEFAULT 9600

#include <HamShield.h>
#include <Wire.h>
#include <avr/wdt.h> 

//TODO: move these into library
#define PWM_PIN 3
#define RESET_PIN A3
#define SWITCH_PIN 2


HamShield radio;
DDS dds;
String messagebuff = "";
String origin_call = "";
String destination_call = "";
String textmessage = "";
int msgptr = 0;

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 pwr to the radio
  digitalWrite(RESET_PIN, HIGH);
  
  Serial.begin(115200);
  Wire.begin();

  
  radio.initialize();
  radio.frequency(144390);
  radio.setRfPower(0);
  dds.start();
  radio.afsk.start(&dds);
  delay(100);
  Serial.println("HELLO");
}

String temp[1] = "";


void loop() {
  messagebuff = "KC7IBT,KC7IBT,:HAMSHIELD TEST";
  prepMessage();
  delay(10000);
}
    

void prepMessage() { 
   radio.setModeTransmit();
   delay(500);
   origin_call = messagebuff.substring(0,messagebuff.indexOf(','));                                          // get originating callsign
   destination_call = messagebuff.substring(messagebuff.indexOf(',')+1,messagebuff.indexOf(',',messagebuff.indexOf(',')+1)); // get the destination call
   textmessage = messagebuff.substring(messagebuff.indexOf(":")+1);
   
   Serial.print("From: "); Serial.print(origin_call); Serial.print(" To: "); Serial.println(destination_call); Serial.println("Text: "); Serial.println(textmessage);

    AFSK::Packet *packet = AFSK::PacketBuffer::makePacket(22 + 32);

    packet->start();
    packet->appendCallsign(origin_call.c_str(),0);
    packet->appendCallsign(destination_call.c_str(),15,true);   
    packet->appendFCS(0x03);
    packet->appendFCS(0xf0);
    packet->print(textmessage);
    packet->finish();
 
    
    bool ret = radio.afsk.putTXPacket(packet);

    if(radio.afsk.txReady()) {
      Serial.println(F("txReady"));
      radio.setModeTransmit();
      //delay(100);
      if(radio.afsk.txStart()) {
        Serial.println(F("txStart"));
      } else {
        radio.setModeReceive();
      }
    }
    // Wait 2 seconds before we send our beacon again.
    Serial.println("tick");
    // Wait up to 2.5 seconds to finish sending, and stop transmitter.
    // TODO: This is hackery.
    for(int i = 0; i < 500; i++) {
      if(radio.afsk.encoder.isDone())
         break;
      delay(50);
    }
    Serial.println("Done sending");
    delay(3000);
    radio.setModeReceive();
} 
 
 
ISR(TIMER2_OVF_vect) {
  TIFR2 = _BV(TOV2);
  static uint8_t tcnt = 0;
  if(++tcnt == 8) {
  digitalWrite(2, HIGH);
  dds.clockTick();
  digitalWrite(2, LOW);
    tcnt = 0;
  }
}

ISR(ADC_vect) {
  static uint8_t tcnt = 0;
  TIFR1 = _BV(ICF1); // Clear the timer flag
  PORTD |= _BV(2); // Diagnostic pin (D2)
  dds.clockTick();
  if(++tcnt == 1) {
    if(radio.afsk.encoder.isSending()) {
      radio.afsk.timer();
    }
    tcnt = 0;
  }
  PORTD &= ~(_BV(2)); // Pin D2 off again
}