256 Wavetable Sound Generator

256 : Wavetable Sound Generator

Design render
  • Author: Ryota Suzuki
  • Description: Small wavetable/PSG type sound generator with I2S output
  • GitHub repository
  • Clock: 50000000 Hz

How it works

This project is Small wave table/PSG type sound generator with I2S output. Major features are:

  • 4 channel sound generator
  • 4-bit x 32depth wave table (can be uses as 2 of 16depth wave table)
  • 8 selectable waveform (3x pulse,1x noise, 4x wave table)
  • 8-bit volume(only for PSG mode, wave table mode is 4-step volume)
  • 16-bit frequency
  • Sampling Frequency is 48828.125Hz (at 50MHz clock)
  • I2S output (16-bit mono)
  • SPI control interface

You can control this sound generator by SPI interface. SPI mode is mode 0 (CPOL=0, CPHA=0), and transaction length is 24-bit. first 8-bit is register address, and next 16-bit is data. Data is MSB first.

Addr Description Width
0x00-0x03 Frequency[0]-[3] 16bit
0x04-0x07 Volume[0]-[3] 8bit (lower 8bits are valid)
0x08-0x0b Waveform Select[0]-[3] 3bit (lower 3bits are valid)
0x20-0x3f WaveTable[0]-[31] 4bit (lower 4bits are valid)

How to test

Connect I2S output to I2S DAC, and control this sound generator by SPI interface. SPI input is connected to RP2040's SPI1 on TT05 breakout board.

External hardware

I2S DAC is required (I tested this design with FPGA and PCM5102A DAC)

IO

#InputOutputBidirectional
0SPI CS InputI2S Bit Clock
1SPI CLK InputI2S Word Select
2SPI MOSI InputI2S Data
3
4
5
6
7

Chip location

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