Add BUG_1750_BROKEN workaround

src/common/src/Core/fsm.c

@@ -1,7 +1,7 @@
/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Matthias P. Braendli, Maximilien Cuony
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
@@ -31,6 +31,12 @@
#include "GPIO/temperature.h"
#include "GPIO/analog.h"

/* Set this flag to 1 to disable the usage of the 1750 signal in the FSM.
 * This is used because the external 1750Hz detector is broken, and we temporarily
 * want to run the repeater in open-through-carrier mode.
 */
#define BUG_1750_BROKEN 1

static struct fsm_input_signals_t fsm_in;
static struct fsm_output_signals_t fsm_out;

@@ -212,9 +218,15 @@ void fsm_update() {
                short_beacon_counter_s++;
            }

#if defined(BUG_1750_BROKEN)
            if (fsm_in.sq) {
                next_state = FSM_OPEN1;
            }
#else
            if (fsm_in.tone_1750 | (fsm_in.sq && sstv_state == SSTV_FSM_ON)) {
                next_state = FSM_OPEN1;
            }
#endif
            else if (balise_state == BALISE_FSM_PENDING) {
                short_beacon_counter_s = 0;
                next_state = select_grande_balise();
@@ -230,9 +242,15 @@ void fsm_update() {
            /* Do not enable TX_ON here, otherwise we could get stuck transmitting
             * forever if SQ never goes low.
             */
#if defined(BUG_1750_BROKEN)
            if (!fsm_in.sq) {
                next_state = FSM_OPEN2;
            }
#else
            if (!fsm_in.sq && !fsm_in.tone_1750) {
                next_state = FSM_OPEN2;
            }
#endif
            break;

        case FSM_OPEN2: