This program is an attempt to create an I2S interface via a PIO state machine on a Raspberry Pi Pico and outputs a 2kHz sine wave on it with a sample rate of 44.1KhZ and on two channels (stereo).
Pins are as follows:
| I2S Signal | GPIO |
|---|---|
| DATA | 15 |
| BCLK | 13 |
| LRCK | 14 |
BCLK clock frequency should be 44.1 kHz × 16 × 2 = 1.4112 MHz.
- BCLK has a lot of jitter sue to the low value of the clock divisor.
- BCLK frequency is incorrect.
- Currently using a MAX98357A DAC, but the outputted frequency is only 1689 Hz instead of 2000 Hz.