flipperzero-firmware/lib/toolbox/manchester-encoder.c

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#include "manchester-encoder.h"
#include <stdio.h>
void manchester_encoder_reset(ManchesterEncoderState* state) {
state->step = 0;
}
bool manchester_encoder_advance(
ManchesterEncoderState* state,
const bool curr_bit,
ManchesterEncoderResult* result) {
bool advance = false;
switch(state->step) {
case 0:
state->prev_bit = curr_bit;
if(state->prev_bit) {
*result = ManchesterEncoderResultShortLow;
} else {
*result = ManchesterEncoderResultShortHigh;
}
state->step = 1;
advance = true;
break;
case 1:
*result = (state->prev_bit << 1) + curr_bit;
if(curr_bit == state->prev_bit) {
state->step = 2;
} else {
state->prev_bit = curr_bit;
advance = true;
}
break;
case 2:
if(curr_bit) {
*result = ManchesterEncoderResultShortLow;
} else {
*result = ManchesterEncoderResultShortHigh;
}
state->prev_bit = curr_bit;
state->step = 1;
advance = true;
break;
default:
printf("DO CRASH HERE\r\n");
// furi_crash
break;
}
return advance;
}
ManchesterEncoderResult manchester_encoder_finish(ManchesterEncoderState* state) {
state->step = 0;
return (state->prev_bit << 1) + state->prev_bit;
}