77 lines
1.7 KiB
C++
77 lines
1.7 KiB
C++
/* Hamshield
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* Example: DDS
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* This is a simple example to show how to transmit arbitrary
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* tones. In this case, the sketh alternates between 1200Hz
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* and 2200Hz at 1s intervals.
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* Connect the HamShield to your Arduino. Screw the antenna
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* into the HamShield RF jack. Connect the Arduino to wall
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* power and then to your computer via USB. Upload this program
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* to your Arduino. To test, set a HandyTalkie to 438MHz. You
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* should hear two alternating tones.
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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 <DDS.h>
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#define PWM_PIN 3
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#define RESET_PIN A3
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#define SWITCH_PIN 2
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#define DDS_USE_ONLY_TIMER2 true
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#define TIMER2_PHASE_ADVANCE 24
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HamShield radio;
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DDS dds;
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void setup() {
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// NOTE: if not using PWM out, it should be held low to avoid tx noise
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pinMode(PWM_PIN, OUTPUT);
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digitalWrite(PWM_PIN, LOW);
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// prep the switch
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pinMode(SWITCH_PIN, INPUT_PULLUP);
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// set up the reset control pin
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pinMode(RESET_PIN, OUTPUT);
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// turn on radio
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digitalWrite(RESET_PIN, HIGH);
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radio.initialize();
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radio.setRfPower(0);
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radio.frequency(438000);
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radio.setModeTransmit();
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dds.start();
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dds.startPhaseAccumulator(DDS_USE_ONLY_TIMER2);
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dds.playWait(600, 3000);
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dds.on();
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//dds.setAmplitude(31);
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}
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void loop() {
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dds.setFrequency(2200);
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delay(1000);
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dds.setFrequency(1200);
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delay(1000);
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}
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#if DDS_USE_ONLY_TIMER2
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ISR(TIMER2_OVF_vect) {
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static unsigned char tcnt = 0;
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if(++tcnt == TIMER2_PHASE_ADVANCE) {
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tcnt = 0;
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dds.clockTick();
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}
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}
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#else // Use the ADC timer instead
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ISR(ADC_vect) {
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static unsigned char tcnt = 0;
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TIFR1 = _BV(ICF1); // Clear the timer flag
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if(++tcnt == 4) {
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tcnt = 0;
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}
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dds.clockTick();
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}
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#endif
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