Added tetra rx ext app (#3257)

firmware/common/dsp_fir_taps.hpp

@@ -2070,4 +2070,20 @@ static constexpr fir_taps_complex<63> taps_1k5_LSB_channel = {
     }},
 };
 
+// TETRA 25kHz filters
+// IFIR wideband pre-filter: fs=3072000, pass=90000, decim=8, fout=384000
+constexpr fir_taps_real<24> taps_25k0_tetra_decim_0 = {
+    .low_frequency_normalized = -90000.0f / 3072000.0f,
+    .high_frequency_normalized = 90000.0f / 3072000.0f,
+    .transition_normalized = 160000.0f / 3072000.0f,
+    .taps = {{55, 122, 244, 424, 666, 965, 1308, 1669, 2019, 2321, 2544, 2663, 2663, 2544, 2321, 2019, 1669, 1308, 965, 666, 424, 244, 122, 55}},
+};
+// IFIR channel filter: fs=384000, pass=15000, decim=8, fout=48000
+constexpr fir_taps_real<32> taps_25k0_tetra_decim_1 = {
+    .low_frequency_normalized = -15000.0f / 384000.0f,
+    .high_frequency_normalized = 15000.0f / 384000.0f,
+    .transition_normalized = 25000.0f / 384000.0f,
+    .taps = {{2, -18, -60, -124, -198, -259, -267, -177, 53, 448, 1003, 1677, 2398, 3068, 3585, 3868, 3868, 3585, 3068, 2398, 1677, 1003, 448, 53, -177, -267, -259, -198, -124, -60, -18, 2}},
+};
+
 #endif /*__DSP_FIR_TAPS_H__*/

firmware/common/message.hpp

@@ -168,6 +168,8 @@ class Message {
         HunterConfig = 110,
         HunterTrigger = 111,
         HunterStop = 112,
+        TetraBsch = 113,
+        TetraDnb = 114,
         MAX
     };
 
@@ -2009,4 +2011,46 @@ class HunterStopMessage : public Message {
         : Message{ID::HunterStop} {}
 };
 
+struct TetraBurstMessage : public Message {
+    constexpr TetraBurstMessage(
+        const uint8_t* bits,
+        bool inv,
+        uint8_t err)
+        : Message(Message::ID::TetraBsch),
+          inverted(inv),
+          sync_errors(err),
+          payload{} {
+        for (size_t i = 0; i < 63; i++)
+            payload[i] = bits[i];
+    }
+
+    bool inverted;
+    uint8_t sync_errors;
+
+    // 500 bit
+    std::array<uint8_t, 63> payload;
+};
+
+struct TetraDnbMessage : public Message {
+    constexpr TetraDnbMessage(
+        const uint8_t* bits,
+        bool inv,
+        uint8_t err,
+        bool p_train)
+        : Message(Message::ID::TetraDnb),
+          inverted(inv),
+          train_errors(err),
+          is_p_train(p_train),
+          payload{} {
+        for (size_t i = 0; i < 54; i++)
+            payload[i] = bits[i];
+    }
+
+    bool inverted;
+    uint8_t train_errors;
+    bool is_p_train;
+
+    // 432 TCH type-5 bits: 216 bits before the training sequence + 216 bits after.
+    std::array<uint8_t, 54> payload;
+};
 #endif /*__MESSAGE_H__*/

firmware/common/spi_image.hpp

@@ -134,6 +134,7 @@ constexpr image_tag_t image_tag_vor_rx{'P', 'V', 'R', 'X'};
 constexpr image_tag_t image_tag_rttyrx{'P', 'R', 'T', 'R'};
 constexpr image_tag_t image_tag_rttytx{'P', 'R', 'T', 'T'};
 constexpr image_tag_t image_tag_tonedetect{'P', 'T', 'N', 'E'};
+constexpr image_tag_t image_tag_tetrarx{'P', 'T', 'E', 'T'};
 
 constexpr image_tag_t image_tag_noop{'P', 'N', 'O', 'P'};