This project is Small wave table/PSG type sound generator with I2S output. Major features are:
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) |
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.
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | SPI CS Input | I2S Bit Clock | none |
| 1 | SPI CLK Input | I2S Word Select | none |
| 2 | SPI MOSI Input | I2S Data | none |
| 3 | none | none | none |
| 4 | none | none | none |
| 5 | none | none | none |
| 6 | none | none | none |
| 7 | none | none | none |