[SAMR21 New Gameplay] 24. Usage of I2C

dcexpert

[SAMR21 New Gameplay] 24. Usage of I2C [Copy link]

 

In CircuitPython, I2C, SPI, UART and other functions are provided by the busio module, so you need to import busio before you can use them. Let's first look at the usage of I2C:

import busio
from board import *

i2c = busio.I2C(SCL, SDA)
i2c.try_lock()
i2c.scan()
i2c.unlock()

When using I2C, first define the i2c pins, then lock I2C before accessing the bus, and release the bus after use.

Note : Currently, the busio library of circuitpython does not support software I2C mode, and can only use specific GPIOs. On SAMR21, the default SCL=PA23, SDA=PA22, and other GPIOs can be specified, but there are certain restrictions.

This content is originally created by dcexpert , a user of EEWORLD forum. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source

dcexpert

When using I2C, it is important to be aware of the differences between CircuitPython and MicroPython so that you can use MicroPython drivers with CircuitPython and vice versa.