44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#include "afskSampler.h"
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HdlcAfskRx* g_afskRx;
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HdlcAfskTx* g_afskTx;
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byte loopBackSample;
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AfskSampler::AfskSampler(int lowLevelSelectPin, HdlcAfskRx* afskRx, HdlcAfskTx* afskTx) {
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g_afskRx = afskRx;
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g_afskTx = afskTx;
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boolean lowLevelMode = false;
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if (lowLevelSelectPin > 0 ) {
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pinMode(lowLevelSelectPin, INPUT);
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lowLevelMode = digitalRead(lowLevelSelectPin) == HIGH;
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}
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ADCSRA = 0;
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ADCSRB = 0;
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ADMUX |= (0 & 0x07); // pin A0
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if (lowLevelMode) {
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ADMUX |= (1 << REFS1); // set internal reference voltage to 1.1V
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}
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ADMUX |= (1 << REFS0); // set reference voltage internal
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ADMUX |= (1 << ADLAR); // left align ADC value to 8 bits from ADCH register
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ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // 128 prescaler 9600 Hz
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ADCSRA |= (1 << ADATE); // enable auto trigger
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ADCSRA |= (1 << ADIE); // enable interrupts when measurement complete
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ADCSRA |= (1 << ADEN); // enable ADC
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ADCSRA |= (1 << ADSC); // start ADC measurements
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}
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ISR(ADC_vect) {
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if (g_afskTx->loopbackTest) {
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g_afskRx->decodeSample(loopBackSample);
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}
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else {
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g_afskRx->decodeSample(ADCH);
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}
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loopBackSample = g_afskTx->encodeSample();
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}
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