Work in progress
This project is a VGM (Video Game Music) player based on a ATmega644/1284 AVR mcu.
This project used two sounds chip from the Megadrive game console :
- The SN76489 PSG sound chip (for noise and square waves)
- The YM2612 FM sound chip (for complex sounds emulation, like piano)
For more detail on the hardware design please take a look at my blog (URL just below my github name).
Basic
- ATmega644 (64K flash, 4Ko RAM) or ATmega1284 (128K flash, 16Ko RAM) AVR mcu running at 16MHz
- FTDI basic module for Serial communication with host PC
- ICSP header for programmation
- 1x 23LC1024 SPI SRAM for VGM file storage
Human-computer interface
- 4x20 serial LCD from Sparkfun
- 3 leds (Yellow for RAM access, Red for "pause", Green for "playing")
- 3 buttons (disable/enable PSG sound chip, disable/enable FM sound chip, Play/Pause)
Audio
- 1x YM2612 FM sound chip (Yamaha)
- 1x SN76489 PSG sound chip (Texas Instrument)
- Analog front-end for mixing and speaker output
Dynamic clocking
- 2x LTC6903 (SPI version) for dynamic clocking of sound chips
For pins mapping please take a look at header file: "pinmap.h".
- XMODEM (with CRC-16) for VGM file transfert over the serial link
- VGM 1.61 (and earlier) for music playback
- GD3 1.0 for track informations (only english strings are used)
For more informations please see:
- http://www.smspower.org/uploads/Music/vgmspec161.txt
- http://www.smspower.org/uploads/Music/gd3spec100.txt
Fake YM2612 and SN76489 are common on ebay. To chek if your YM2612 or SN76489 are fake or not two test code are provided.
- One for the YM2612 who play the same note again and again infinitly.
- One for the SN76489 who play some notes on all channels sequencialy in an infinite loop.