HamShield/examples/AFSK_SerialMessenger/AFSK_SerialMessenger.ino

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/* Hamshield
* Example: AFSK Serial Messenger
* Serial glue to send messages over APRS. You will need a
* seperate AFSK receiver to test the output of this example.
* Connect the HamShield to your Arduino. Screw the antenna
* into the HamShield RF jack. After uploading this program
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* to your Arduino, open the Serial Monitor to monitor. Type
* a message under 254 characters into the bar at the top of
* the monitor. Click the "Send" button. Check for output on
* AFSK receiver.
* NOTE: add message receive code
*/
#include <HamShield.h>
#include <DDS.h>
#include <packet.h>
#include <avr/wdt.h>
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#define PWM_PIN 3
#define RESET_PIN A3
#define SWITCH_PIN 2
HamShield radio;
DDS dds;
AFSK afsk;
String messagebuff = "";
String origin_call = "";
String destination_call = "";
String textmessage = "";
int msgptr = 0;
void setup() {
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// 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 the radio
digitalWrite(RESET_PIN, HIGH);
Serial.begin(9600);
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radio.initialize();
radio.frequency(145570);
radio.setRfPower(0);
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radio.setVolume1(0xFF);
radio.setVolume2(0xFF);
radio.setSQHiThresh(-100);
radio.setSQLoThresh(-100);
radio.setSQOn();
dds.start();
afsk.start(&dds);
delay(100);
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radio.setModeReceive();
Serial.println("HELLO");
}
void loop() {
if(Serial.available()) {
char temp = (char)Serial.read();
if(temp == '`') {
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//Serial.println(messagebuff);
prepMessage();
msgptr = 0;
Serial.print("!!");
}
else {
messagebuff += temp;
msgptr++;
}
}
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if(msgptr > 254) { messagebuff = ""; Serial.print("X!"); }
if(afsk.decoder.read() || 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(afsk.rxPacketCount()) {
AFSK::Packet *packet = afsk.getRXPacket();
Serial.print(F("Packet: "));
if(packet) {
packet->printPacket(&Serial);
AFSK::PacketBuffer::freePacket(packet);
}
}
}
}
void prepMessage() {
radio.setModeTransmit();
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delay(1000);
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);
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// 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 = afsk.putTXPacket(packet);
if(afsk.txReady()) {
Serial.println(F("txReady"));
radio.setModeTransmit();
//delay(100);
if(afsk.txStart()) {
Serial.println(F("txStart"));
} else {
radio.setModeReceive();
}
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}
// 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(afsk.encoder.isDone())
break;
delay(50);
}
Serial.println("Done sending");
radio.setModeReceive();
}
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ISR(TIMER2_OVF_vect) {
TIFR2 = _BV(TOV2);
static uint8_t tcnt = 0;
if(++tcnt == 8) {
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dds.clockTick();
tcnt = 0;
}
}
ISR(ADC_vect) {
static uint8_t tcnt = 0;
TIFR1 = _BV(ICF1); // Clear the timer flag
dds.clockTick();
if(++tcnt == 1) {
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afsk.timer();
tcnt = 0;
}
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}