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esp32: Add support for hardware I2C.

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This commit is contained in:
Damien George
2019-07-10 13:43:52 +10:00
parent 3967dd68e8
commit a29334761d
4 changed files with 192 additions and 3 deletions
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14
docs/esp32/quickref.rst
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@@ -303,14 +303,22 @@ Hardware SPI has the same methods as Software SPI above::
I2C bus
-------
The I2C driver is implemented in software and works on all pins,
and is accessed via the :ref:`machine.I2C <machine.I2C>` class::
The I2C driver has both software and hardware implementations, and the two
hardware peripherals have identifiers 0 and 1. Any available output-capable
pins can be used for SCL and SDA. The driver is accessed via the
:ref:`machine.I2C <machine.I2C>` class::
from machine import Pin, I2C
# construct an I2C bus
# construct a software I2C bus
i2c = I2C(scl=Pin(5), sda=Pin(4), freq=100000)
# construct a hardware I2C bus
i2c = I2C(0)
i2c = I2C(1, scl=Pin(5), sda=Pin(4), freq=400000)
i2c.scan() # scan for slave devices
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