124 lines
3.0 KiB
C++
124 lines
3.0 KiB
C++
/* Hamshield
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* Example: QPSK63Transmit
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* This is a simple example to demonstrate HamShield QPSK63
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* transmit functionality.
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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. After uploading
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* this program to your adruino, tune a QPSK63 receiver and
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* wait to receive the message "Why hello there, friend.
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* Nice to meet you. Welcome to QPSK63. 73, VE6SLP sk"
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*/
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#include <HamShield.h>
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#include "varicode.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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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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digitalWrite(RESET_PIN, LOW);
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Serial.begin(9600);
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// put your setup code here, to run once:
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dds.setReferenceClock(32000);
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dds.start();
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dds.setFrequency(1000);
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dds.on();
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}
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volatile bool sent = true;
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volatile uint16_t bitsToSend = 0;
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volatile uint8_t zeroCount = 0;
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void sendChar(uint8_t c) {
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uint16_t bits = varicode[c];
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while((bits&0x8000)==0) {
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bits<<=1;
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}
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while(!sent) {} //delay(32);
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cli();
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sent = false;
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bitsToSend = bits;
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sei();
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while(!sent) {} //delay(32);
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//PORTD &= ~_BV(2); // Diagnostic pin (D2)
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}
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char *string = "Why hello there, friend. Nice to meet you. Welcome to PSK31. 73, VE6SLP sk\r\n";
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void loop() {
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int i;
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// put your main code here, to run repeatedly:
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//for(i = 0; i<5; i++)
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// sendChar(0);
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// return;
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for(i = 0; i < strlen(string); i++) {
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sendChar(string[i]);
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//Serial.println(string[i]);
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}
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}
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const uint8_t amplitudeShape[41] = {
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255, 241, 228, 215, 203, 191, 181, 171, 161, 152, 143, 135, 128, 121, 114, 107, 101, 96, 90, 85, 80, 76, 72, 68, 64, 60, 57, 54, 51, 48, 45, 42, 40, 38, 36, 34, 32, 30, 28, 27, 25
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};
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// This will trigger at 8kHz
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const uint16_t qpskConvolution[32] = {
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180, 90, -90, 0, -90, 0, 180, 90,
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0, -90, 90, 180, 90, 180, 0, -90,
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90, 180, 0, -90, 0, -90, 90, 180,
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-90, 0, 180, 90, 180, 90, -90, 0
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};
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uint8_t last5Bits = 0b00000;
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ISR(ADC_vect) {
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static uint8_t outer = 0;
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static uint8_t tcnt = 0;
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TIFR1 |= _BV(ICF1);
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// Wave shaping
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// TODO: Improve how this would perform.
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if(tcnt < 81)
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dds.setAmplitude(amplitudeShape[(81-tcnt)/2]);
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if(tcnt > (255-81))
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dds.setAmplitude(amplitudeShape[(tcnt-174)/2]);
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dds.clockTick();
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if(outer++ == 1) {
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outer = 0;
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} else {
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return;
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}
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if(tcnt++ == 0) { // Next bit
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last5Bits <<= 1;
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if(!sent) {
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if((bitsToSend & 0x8000) == 0) {
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zeroCount++;
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} else {
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zeroCount = 0;
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last5Bits |= 1;
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}
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dds.changePhaseDeg(qpskConvolution[last5Bits&31]);
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bitsToSend<<=1;
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if(zeroCount == 2) {
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sent = true;
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}
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} else {
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// Idle on zeroes
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dds.changePhaseDeg(qpskConvolution[last5Bits&31]);
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}
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}
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}
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