Example for AFSK sending (AX25 format) added. DDS updated to a slower clock rate again.

examples/AFSK-Send/AFSK-Send.ino

@@ -0,0 +1,73 @@
+#include <HamShield.h>
+#include <Wire.h>
+
+HamShield radio;
+DDS dds;
+
+void setup() {
+  Serial.begin(9600);
+  // put your setup code here, to run once:
+  pinMode(2, OUTPUT);
+  pinMode(10, OUTPUT);
+  pinMode(3, OUTPUT);
+  pinMode(11, OUTPUT);
+  digitalWrite(2, LOW);
+  digitalWrite(10, LOW);
+
+  dds.start();
+  radio.afsk.start(&dds);
+  Serial.println("Starting...");
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+    AFSK::Packet *packet = AFSK::PacketBuffer::makePacket(22 + 32);
+    packet->start();
+    packet->appendFCS('V'<<1);
+    packet->appendFCS('E'<<1);
+    packet->appendFCS('6'<<1);
+    packet->appendFCS('S'<<1);
+    packet->appendFCS('L'<<1);
+    packet->appendFCS('P'<<1);
+    packet->appendFCS(0b11100000);
+    packet->appendFCS('V'<<1);
+    packet->appendFCS('A'<<1);
+    packet->appendFCS('6'<<1);
+    packet->appendFCS('G'<<1);
+    packet->appendFCS('A'<<1);
+    packet->appendFCS(' '<<1);
+    packet->appendFCS(0b01100001 | (15 & 0xf) << 1);
+    packet->appendFCS(0x03);
+    packet->appendFCS(0xf0);
+    packet->print("Hello ");
+    packet->println(millis());
+    packet->finish();
+    
+    bool ret = radio.afsk.putTXPacket(packet);
+    if(radio.afsk.txReady())
+      if(radio.afsk.txStart()) {
+        Serial.println("PTT here.");
+      }
+    // Wait 2 seconds before we send our beacon again.
+    Serial.println("tick");
+    delay(2000);
+}
+
+/*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) {
+  TIFR1 = _BV(ICF1); // Clear the timer flag
+  digitalWrite(2, HIGH);
+  dds.clockTick();
+  radio.afsk.timer();
+  digitalWrite(2, LOW);
+}
+