Cynopolis/FM-Generator
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Frequency Modulation now works

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This commit is contained in:
Quinn
2022-10-25 11:56:29 -05:00
parent 3b5766c438
commit d5a5b17770
1 changed files with 6 additions and 6 deletions
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12
src/main.cpp
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@@ -129,11 +129,11 @@ void setPWMFrequency(uint32_t frequency, uint32_t pwmPin) {
TC_SetRC(chTC, chNo, TC); TC_SetRC(chTC, chNo, TC);
TC_SetRA(chTC, chNo, 127*TC/255); TC_SetRA(chTC, chNo, 127*TC/255);
// read counter value // if the current reset value is less than the current counter value...
uint32_t ulValue = TC_GetCV(chTC, chNo); if(TC < TC_ReadCV(chTC, chNo)){
// counter overflowed, so reset it
// reset the counter TC_Start(chTC, chNo);
// TC_Start(chTC, chNo); }
} }
@@ -171,7 +171,7 @@ void loop() {
// Read the message signal and map it to a value from 90 to -90 us. // Read the message signal and map it to a value from 90 to -90 us.
// 90 microseconds corresponds to half of 22 kHz (an audio input signal). // 90 microseconds corresponds to half of 22 kHz (an audio input signal).
FM_factor = fastAnalogRead(ADC_CHANNEL_0); FM_factor = fastAnalogRead(ADC_CHANNEL_0);
FM_factor = map(FM_factor, 0, 4095, 1000, -1000); FM_factor = map(FM_factor, 0, 4095, 10000, -10000);
//modulate the carrier signal with the message signal by changing the reset value of the timer //modulate the carrier signal with the message signal by changing the reset value of the timer
// TC_SetRC(TC2, 0, 997 + FM_factor); // TC_SetRC(TC2, 0, 997 + FM_factor);
sig_frequency = 42000 + FM_factor; sig_frequency = 42000 + FM_factor;