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

DDS.cpp

@@ -42,7 +42,8 @@ void DDS::start() {
   // clock as the DDS.
   TCCR1B = _BV(CS11) | _BV(WGM13) | _BV(WGM12);
   TCCR1A = 0;
-  ICR1 = ((F_CPU / 8) / refclk) - 1;
+  //ICR1 = ((F_CPU / 8) / refclk) - 1;
+  ICR1 = ((F_CPU / 8) / 9600) - 1;
 
   // Configure the ADC here to automatically run and be triggered off Timer1
   ADMUX = _BV(REFS0) | _BV(ADLAR) | 0; // Channel 0, shift result left (ADCH used)

DDS.h

@@ -42,7 +42,7 @@
 // This is how often we'll perform a phase advance, as well as ADC sampling
 // rate. The higher this value, the smoother the output wave will be, at the
 // expense of CPU time. It maxes out around 62000 (TBD)
-#define DDS_REFCLK_DEFAULT     38400
+#define DDS_REFCLK_DEFAULT     9600
 // As each Arduino crystal is a little different, this can be fine tuned to
 // provide more accurate frequencies. Adjustments in the range of hundreds
 // is a good start.
@@ -50,7 +50,7 @@
 
 #ifdef DDS_USE_ONLY_TIMER2
 // TODO: Figure out where this clock value is generated from
-#define DDS_REFCLK_DEFAULT     48800
+#define DDS_REFCLK_DEFAULT     (62500/4)
 #endif
 
 // When defined, use the 1024 element sine lookup table. This improves phase

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);
+}
+