New Morse TX app (#2948)

* morse tx
* global button repeat function improvement

firmware/baseband/proc_morsetx.hpp

@@ -0,0 +1,33 @@
+#ifndef __PROC_MORSETX_H__
+#define __PROC_MORSETX_H__
+
+#include "baseband_processor.hpp"
+#include "baseband_thread.hpp"
+#include "portapack_shared_memory.hpp"
+#include "audio_output.hpp"
+#include "audio_dma.hpp"
+
+#define AUDIO_OUTPUT_BUFFER_SIZE 32
+#define AUDIO_SAMPLING_RATE 24000
+
+class MorseTXProcessor : public BasebandProcessor {
+   public:
+    void execute(const buffer_c8_t& buffer) override;
+    void on_message(const Message* const msg) override;
+
+   private:
+    bool configured{false};
+    bool key_down{false};  // currently the virtual key is pressed or not.
+
+    int8_t sample{0}, re{0}, im{0};
+    uint8_t modulation{0};   // 0=AM, 1=FM, 2=DSB, 3=USB, 4=LSB
+    uint32_t tone_delta{0};  // shifting value by tone
+    uint32_t fm_delta{};
+    uint32_t tone_phase{0};
+    uint32_t tone{0};                       // audio tone frequeny
+    int32_t phase{0}, sphase{0}, delta{0};  // sample generation.
+
+    BasebandThread baseband_thread{1536000, this, baseband::Direction::Transmit};
+};
+
+#endif