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Firmware/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

Firmware/include/music.h

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+#ifndef MUSIC_H_
+#define MUSIC_H_
+
+typedef struct  
+{
+	uint16_t tone;
+	uint16_t duration;
+} MUSIC_Note;
+
+#define MUSIC_END { 0, 0 }
+#define MUSIC_IS_END(_note_)  (!((_note_).tone) && !((_note_).duration))
+
+#define MUSIC_A4 440
+#define MUSIC_B4 494
+#define MUSIC_C4 262
+#define MUSIC_D4 293
+#define MUSIC_E4 330
+#define MUSIC_F4 349
+#define MUSIC_G4 392
+
+#define MUSIC_A5 880
+#define MUSIC_B5 988
+#define MUSIC_C5 523
+#define MUSIC_D5 587
+#define MUSIC_E5 659
+#define MUSIC_F5 698
+#define MUSIC_G5 784
+
+#define MUSIC_1 1000
+#define MUSIC_2 (MUSIC_1/2)
+#define MUSIC_4 (MUSIC_1/4)
+#define MUSIC_8 (MUSIC_1/8)
+#define MUSIC_16 (MUSIC_1/16)
+#define MUSIC_32 (MUSIC_1/32)
+
+	
+typedef const MUSIC_Note* MUSIC_Track;
+extern const MUSIC_Note MUSIC_Tetris[];
+
+void Music_PlayTrack (MUSIC_Track track);
+
+
+#endif /* MUSIC_H_ */