ESP32 Fast Sampling experiments

Forked from

This project only modifies and uses the i2s_sampling scripts from the original repo.

i2s_sampling

This project handles both analogue devices (such as the MAX4466 and the MAX9814) and I2S devices (such as the SPH0645 and INMP441). This project demonstrates how to use the I2S peripheral for high-speed sampling using DMA to transfer samples directly to RAM. We can read these samples from the internal ADC or from the I2S peripheral directly.

The current set of pin assignment in the code are:

ADC

Function	GPIO Pin	Notes
Analogue input	GPIO35	ADC_UNIT_1, ADC1_CHANNEL_7

I2S

Function	GPIO Pin	Notes
bck_io_num	GPIO_NUM_32	I2S - Serial clock
ws_io_num	GPIO_NUM_25	I2S - LRCLK - left right clock
data_in_num	GPIO_NUM_33	I2S - Serial data