Feather ESP32-S2 I2C Setup
The Feather ESP32-S2 only has one I2C port, also known as board.I2C(), that is on pins SDA and SCL and shared with the STEMMA QT connector.
It does have a built in battery monitor that is listening on address 0x0B, so that address cannot be used by other devices.
The Feather ESP32-S2 also has a power 'switch' on the I2C port connected to GPIO 7 . On Rev B of the PCB, you have to set the pin LOW to turn on the I2C power and pullups. On Rev C of the PCB, you have to set the pin HIGH. This is a little confusing but to make it simple we have a bit of code that will activate the power port by setting the control pin (GPIO 7) to an OUTPUT and the opposite of the 'rest state' before accessing the I2C port
This code snippet shows ENABLING the I2C power and pullups, it works on both rev B and rev C
import time import digitalio import board i2c_power = digitalio.DigitalInOut(board.I2C_POWER) i2c_power.switch_to_input() time.sleep(0.01) # wait for default value to settle rest_level = i2c_power.value i2c_power.switch_to_output(value=(not rest_level))
This code snippet shows DISABLING the I2C power and pullups, it works on both rev B and rev C
import time import digitalio import board i2c_power = digitalio.DigitalInOut(board.I2C_POWER) i2c_power.switch_to_input()
