sparkfun MicroMod ESP32 Hook-Up Manual page 8

AUDIO
The ESP32 Processor supports audio using the I S standard. The pins used are:
AUD_OUT - GPIO pin 17, pad 56 on the MicroMod, this is the digital audio output.
AUD_IN - GPIO pin 16, pad 54 on the MicroMod, this is the digital audio input.
AUD_LRCLK - GPIO pin 25, pad 52 on the MicroMod. Officially called "word select", and also known as
"frame sync".
AUD_BCLK - GPIO pin 26, pad 50 on the MicroMod. Offically called "continuous serial clock, and also
known as the "bit clock"
2
Note: The I S bus is shared with the secondary UART, secondary I C bus, and gernal purpose pins G1-G4.
SPI
The MicroMod standard supports two Serial Peripheral Interface (SPI) buses, but because of the limited GPIO pins
here, only the primary SPI bus is used. This primary SPI bus is dedicated to the following pins:
SCK - This is the clock pin, which is connected to GPIO 18, or MicroMod pad 57.
SDO - This is the serial data output of the ESP32, which is connected to GPIO 23, or MicroMod pad 59.
SDI - This is the serial data input of the ESP32, which is connected to GPIO 19, or MicroMod pad 61.
#CS - This is the chip select pin, which is connected to GPIO 5, or MicroMod pad 55.
Note: You may not recognize the COPI/CIPO labels for SPI pins. SparkFun is working to move away from
using MISO/MOSI to describe signals between the controller and the peripheral. Check out this page for
more on our reasoning behind this change.
ESP32 MicroMod Processor Pin Functionality
AUDIO UART
ESP32 Alternate Function
Pin
2
ESP32 PROCESSOR BOARD PINOUT TABLE
MICROMOD GENERAL PINOUT TABLE
MICROMOD GENERAL PIN DESCRIPTIONS
GPIO/BUS I C
Primary Bottom
Function
2
2
SDIO
Top Primary
Pin Pin Function
73 G5
71 G6
61 SPI_CIPO
59 SPI_COPI
SPI0 Dedicated
Alternate Function
RTC
RTC
ESP
Pin
32
33
19
23