flipperzero-firmware/applications/lfrfid/helpers/osc_fsk.h

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#pragma once
#include <stdint.h>
/**
* This code tries to fit the periods into a given number of cycles (phases) by taking cycles from the next cycle of periods.
*/
class OscFSK {
public:
/**
* Get next period
* @param bit bit value
* @param period return period
* @return bool whether to advance to the next bit
*/
bool next(bool bit, uint16_t* period);
/**
* FSK ocillator constructor
*
* @param freq_low bit 0 freq
* @param freq_hi bit 1 freq
* @param osc_phase_max max oscillator phase
*/
OscFSK(uint16_t freq_low, uint16_t freq_hi, uint16_t osc_phase_max);
private:
const uint16_t freq[2];
const uint16_t osc_phase_max;
int32_t osc_phase_current;
};