adding HandyTalkie example

examples/HandyTalkie/HandyTalkie.ino

@@ -0,0 +1,132 @@
+// Hamshield 
+
+// Arduino Wire library is required if I2Cdev I2CDEV_ARDUINO_WIRE implementation
+// is used in I2Cdev.h
+#include "Wire.h"
+
+#include <HamShield.h>
+
+// create object for radio
+HamShield radio;
+
+#define LED_PIN 13
+#define RSSI_REPORT_RATE_MS 5000
+
+//TODO: move these into library
+#define PWM_PIN 3
+#define RESET_PIN A3
+#define SWITCH_PIN 2
+
+bool blinkState = false;
+bool currently_tx;
+
+uint32_t freq;
+
+unsigned long rssi_timeout;
+
+void setup() {
+  // 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);
+  digitalWrite(RESET_PIN, LOW);
+  
+  
+  // initialize serial communication
+  Serial.begin(115200);
+  Serial.println("press the swich to begin...");
+  
+  while (digitalRead(SWITCH_PIN));
+  
+  // let the AU ot of reset
+  digitalWrite(RESET_PIN, HIGH);
+  
+  Serial.println("beginning radio setup");
+  
+  // join I2C bus (I2Cdev library doesn't do this automatically)
+   Wire.begin();
+
+  // verify connection
+  Serial.println("Testing device connections...");
+  Serial.println(radio.testConnection() ? "RDA radio connection successful" : "RDA radio connection failed");
+
+  // initialize device
+  Serial.println("Initializing I2C devices...");
+  radio.initialize(); // initializes automatically for UHF 12.5kHz channel
+
+  Serial.println("setting default Radio configuration");
+  radio.dangerMode();
+
+  // set frequency
+  Serial.println("changing frequency");
+  
+  radio.setSQOff();
+  freq = 450000;
+  radio.frequency(freq);
+  
+  // set to receive
+  
+  radio.setModeReceive();
+  currently_tx = false;
+  Serial.print("config register is: ");
+  Serial.println(radio.readCtlReg());
+  Serial.println(radio.readRSSI());
+  
+/*
+  // set to transmit
+  radio.setModeTransmit();
+  // maybe set PA bias voltage
+  Serial.println("configured for transmit");
+  radio.setTxSourceMic();
+  
+  
+  */  
+  radio.setRfPower(0);
+    
+  // configure Arduino LED for
+  pinMode(LED_PIN, OUTPUT);
+  rssi_timeout = 0;
+
+}
+
+void loop() {  
+  if (!digitalRead(SWITCH_PIN))
+  {
+    if (!currently_tx) 
+    {
+      currently_tx = true;
+      
+      // set to transmit
+      radio.setModeTransmit();
+      Serial.println("Tx");
+      //radio.setTxSourceMic();
+      //radio.setRfPower(1);
+    }
+  } else if (currently_tx) {
+    radio.setModeReceive();
+    currently_tx = false;
+    Serial.println("Rx");
+  }
+  
+  
+  if (Serial.available()) {
+    Serial.setTimeout(40);
+    freq = Serial.parseInt();
+    Serial.flush();
+    radio.frequency(freq);
+    Serial.print("set frequency: ");
+    Serial.println(freq);
+  }
+  
+  if (!currently_tx && (millis() - rssi_timeout) > RSSI_REPORT_RATE_MS)
+  {
+    Serial.println(radio.readRSSI());
+    rssi_timeout = millis();
+  }
+}
+