eSOCFM-1 system board computer music machine can make different tones of sound by connecting a small speaker, and this article introduces the layout of system board GPIO, timer, interrupt and other hardware resources, as well as how to connect a speaker to the system board easily
The AN0002 is a music playback device designed to generate Nokia phone ringtones using a system board (csSOCFM‑1). The manual explains the underlying principles of sound generation, GPIO control, timer operation, and interrupt handling, and provides complete code examples for creating and playing musical notes.
Key sections cover the device purpose, the theory of sound (pitch, timbre, volume), detailed GPIO usage, timer configuration, interrupt service routines, and a full example program that loads note tables and plays songs via the Nokia ringtone output. This manual is written in Chinese.
| GPIO Pins | 16‑bit GPIO with 11 usable pins (GPIO0‑10) |
|---|
Use the command `SET TO10 HIGH` in the program to drive the IO10 pin high.
It is a music playback machine that generates Nokia phone ringtones by outputting square‑wave audio through the Nokia ringtone connector.