127 lines
2.9 KiB
Arduino
127 lines
2.9 KiB
Arduino
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/* Serial glue to send messages over APRS
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*
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* To do: add message receive code
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*
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*/
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#define DDS_REFCLK_DEFAULT 9600
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#include <HamShield.h>
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#include <Wire.h>
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#include <avr/wdt.h>
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HamShield radio;
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DDS dds;
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String messagebuff = "";
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String origin_call = "";
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String destination_call = "";
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String textmessage = "";
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int msgptr = 0;
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void setup() {
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Serial.begin(115200);
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Wire.begin();
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pinMode(2, OUTPUT);
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pinMode(3, OUTPUT);
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radio.initialize();
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radio.frequency(145570);
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radio.setRfPower(15);
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dds.start();
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radio.afsk.start(&dds);
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pinMode(11, INPUT); // Bodge for now, as pin 3 is hotwired to pin 11
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delay(100);
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Serial.println("HELLO");
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}
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String temp[1] = "";
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void loop() {
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if(Serial.available()) {
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char temp = (char)Serial.read();
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if(temp == '`') {
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prepMessage(); msgptr = 0; Serial.print("!!"); }
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else {
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messagebuff += temp;
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msgptr++;
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}
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}
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if(msgptr > 254) { messagebuff = ""; Serial.print("X!"); }
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}
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void prepMessage() {
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radio.setModeTransmit();
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delay(500);
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origin_call = messagebuff.substring(0,messagebuff.indexOf(',')); // get originating callsign
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destination_call = messagebuff.substring(messagebuff.indexOf(',')+1,
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messagebuff.indexOf(',',messagebuff.indexOf(',')+1)); // get the destination call
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textmessage = messagebuff.substring(messagebuff.indexOf(":"));
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AFSK::Packet *packet = AFSK::PacketBuffer::makePacket(22 + 32);
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packet->start();
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packet->appendCallsign(origin_call.c_str(),0);
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packet->appendCallsign(destination_call.c_str(),15,true);
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packet->appendFCS(0x03);
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packet->appendFCS(0xf0);
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packet->print(textmessage);
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packet->finish();
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textmessage = "";
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bool ret = radio.afsk.putTXPacket(packet);
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if(radio.afsk.txReady()) {
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Serial.println(F("txReady"));
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radio.setModeTransmit();
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//delay(100);
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if(radio.afsk.txStart()) {
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Serial.println(F("txStart"));
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} else {
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radio.setModeReceive();
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}
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}
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// Wait 2 seconds before we send our beacon again.
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Serial.println("tick");
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// Wait up to 2.5 seconds to finish sending, and stop transmitter.
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// TODO: This is hackery.
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for(int i = 0; i < 500; i++) {
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if(radio.afsk.encoder.isDone())
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break;
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delay(50);
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}
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Serial.println("Done sending");
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delay(3000);
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radio.setModeReceive();
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}
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ISR(TIMER2_OVF_vect) {
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TIFR2 = _BV(TOV2);
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static uint8_t tcnt = 0;
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if(++tcnt == 8) {
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digitalWrite(2, HIGH);
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dds.clockTick();
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digitalWrite(2, LOW);
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tcnt = 0;
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}
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}
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ISR(ADC_vect) {
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static uint8_t tcnt = 0;
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TIFR1 = _BV(ICF1); // Clear the timer flag
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PORTD |= _BV(2); // Diagnostic pin (D2)
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dds.clockTick();
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if(++tcnt == 1) {
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if(radio.afsk.encoder.isSending()) {
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radio.afsk.timer();
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}
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tcnt = 0;
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}
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PORTD &= ~(_BV(2)); // Pin D2 off again
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}
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