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i2c.scan() # scan for slaves on the bus, returning
# a list of valid addresses
i2c.readfrom_mem( 0x42 , 2 , 3 ) # read 3 bytes from memory of slave 0x42,
# starting at address 2 in the slave
i2c.writeto_mem( 0x42 , 2 , 'abc' ) # write 'abc' (3 bytes) to memory of slave 0x42
# starting at address 2 in the slave, timeout afte
r 1 second
Quick Usage Example
from machine import I2C
# configure the I2C bus
i2c = I2C( 0 , I2C.MASTER, baudrate= 100000 )
i2c.scan() # returns list of slave addresses
i2c.writeto( 0x42 , 'hello' ) # send 5 bytes to slave with address 0x42
i2c.readfrom( 0x42 , 5 ) # receive 5 bytes from slave
i2c.readfrom_mem( 0x42 , 0x10 , 2 ) # read 2 bytes from slave 0x42, slave memory 0x10
i2c.writeto_mem( 0x42 , 0x10 , 'xy' ) # write 2 bytes to slave 0x42, slave memory 0x10
Constructors
class machine.I2C(bus, ...)
Construct an I2C object on the given
bus
.
bus
can only be
0, 1, 2
. If the
bus
is not
given, the default one will be selected (
0
). Buses
0
and
1
use the ESP32 I2C hardware
peripheral while bus
2
is implemented with a bit-banged software driver.
General Methods
i2c.init(mode, * , baudrate=100000, pins=(SDA, SCL))
Initialise the I2C bus with the given parameters:
mode
must be I2C.MASTER
baudrate
is the SCL clock rate
pins is an optional tuple with the pins to assign to the I2C bus. The default I2C pins are
P9
(SDA) and
P10
(SCL)
i2c.scan()
Scan all I2C addresses between
0x08
and
0x77
inclusive and return a list of those that
respond. A device responds if it pulls the SDA line low after its address (including a read bit)
is sent on the bus.
5.2.1.3 I2C
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