#I2C

I2C is a common 2 wire bus where a master talk to a slave using the slave's address. The available implementation is for I2C Master only, allowing the chip to talk to I2C slaves, such as displays and accelerometers.

Hardware I2C

MicroPython implementation on SITCore internally uses Software I2C but compatibility is provides the hardware class.

from machine import I2C, Pin
i2c = I2C(1, freq=100000) # Uses I2C1
i2c.scan() # show what slaves are available

i2c.readfrom(0x3a, 4)   # read 4 bytes from slave device with address 0x3a
i2c.writeto(0x3a, '12') # write '12' to slave device with address 0x3a

buf = bytearray(10)     # create a buffer with 10 bytes
i2c.writeto(0x3a, buf)  # write the given buffer to the slave

Note

i2c.scan() returns addresses 0x8 to 0x77 only.

Software I2C

Software I2C can work with any pin.

from machine import Pin, SoftI2C
i2c = SoftI2C(scl=Pin("PB8"), sda=Pin("PB9"))

Table of Contents

Hardware I2C

Note

Software I2C