From 4fb55520eaf3a3763313098462744dfaccdcfce2 Mon Sep 17 00:00:00 2001
From: Stephen Olesen <slepp@slepp.ca>
Date: Mon, 6 Jul 2015 11:40:50 -0600
Subject: [PATCH] First round of AX25 receiver.

---
 examples/AX25Receive/AX25Receive.ino | 79 ++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 examples/AX25Receive/AX25Receive.ino

diff --git a/examples/AX25Receive/AX25Receive.ino b/examples/AX25Receive/AX25Receive.ino
new file mode 100644
index 0000000..4f4efca
--- /dev/null
+++ b/examples/AX25Receive/AX25Receive.ino
@@ -0,0 +1,79 @@
+#define DDS_REFCLK_DEFAULT 9600
+
+#include <HamShield.h>
+#include <Wire.h>
+
+HamShield radio;
+DDS dds;
+
+void setup() {
+  Serial.begin(9600);
+  Wire.begin();
+  pinMode(2, OUTPUT);
+  pinMode(3, OUTPUT);
+  
+  Serial.println(F("Radio test connection"));
+  Serial.println(radio.testConnection(), DEC);
+  Serial.println(F("Initialize"));
+  delay(100);
+  radio.initialize();
+  Serial.println(F("Frequency"));
+  delay(100);
+//  radio.setVHF();
+//  radio.setRfPower(0);
+//  radio.setModeReceive();
+  radio.setVolume1(0xFF);
+  radio.setVolume2(0xFF);
+  radio.frequency(145050);
+  Serial.println(F("DDS Start"));
+  delay(100);
+  dds.start();
+  Serial.println(F("AFSK start"));
+  delay(100);
+  radio.afsk.start(&dds);
+  Serial.println(F("Starting..."));
+  pinMode(11, INPUT); // Bodge for now, as pin 3 is hotwired to pin 11
+  delay(100);
+  dds.setAmplitude(255);
+}
+
+uint32_t last = 0;
+void loop() {
+   if(radio.afsk.decoder.read() || radio.afsk.rxPacketCount()) {
+      // A true return means something was put onto the packet FIFO
+      Serial.println("Packet");
+      // If we actually have data packets in the buffer, process them all now
+      while(radio.afsk.rxPacketCount()) {
+        AFSK::Packet *packet = radio.afsk.getRXPacket();
+        if(packet) {
+          for(unsigned short i = 0; i < packet->len; ++i)
+            Serial.write((uint8_t)packet->getByte());
+          AFSK::PacketBuffer::freePacket(packet);
+        }
+      }
+    }
+    /*if(last < millis()) {
+      Serial.println(radio.readRSSI());
+      last = millis()+1000;
+    }*/
+}
+
+/*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();
+  radio.afsk.timer();
+  PORTD &= ~(_BV(2)); // Pin D2 off again
+}
+