Morse rx further development (#2959)

* filters OK, radio configurations set

* all modes are working, noise still needs work, especially in FM. A baseband enum is also needed

* audio and decoding fixed, clipping and the baseband enum are still missing

firmware/baseband/proc_morse.hpp

@@ -60,13 +60,22 @@ class MorseProcessor : public BasebandProcessor {
     dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0{};
     dsp::decimate::FIRC16xR16x32Decim8 decim_1{};
     dsp::decimate::FIRAndDecimateComplex channel_filter{};
+    dsp::demodulate::AM demod_AM{};
     dsp::demodulate::FM demod_cw_fm{};
     dsp::demodulate::SSB demod_ssb{};
     AudioOutput audio_output{};
 
     bool configured{false};
 
-    uint8_t modulation{0};  // 0=CW/FM, 1=USB, 2=LSB
+    enum class ModulationMode : uint8_t {
+        AM = 0,
+        FM = 1,
+        DSB = 2,
+        USB = 3,
+        LSB = 4
+    };
+
+    ModulationMode modulation = ModulationMode::AM;
     int32_t user_squelch_level{0};
     bool squelch_is_open{true};
     int32_t squelch_hold{0};
@@ -79,7 +88,6 @@ class MorseProcessor : public BasebandProcessor {
     float meas_freq_accumulator{0.0f};
     uint32_t meas_freq_count{0};
     uint32_t ui_update_timer{0};
-
     float current_freq{700.0f};
 
     // --- Decoding variables (Goertzel) ---
@@ -92,6 +100,9 @@ class MorseProcessor : public BasebandProcessor {
     int64_t noise_floor{5000};
     int32_t startup_delay{20};
 
+    float dc_average = 0.0f;  // DC level tracking
+    int32_t dc_average_int = 0;
+
     MorseRXDataMessage message{};
     MorseRXfreqMessage freq_message{};
 };