MaixPy Using I2C

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For MaixCAM, due to the tight pin resource constraints, the I2C pins overlap with the WiFi module (SDIO1), so you can only use either WiFi or hardware I2C, but not both.

Therefore, it is recommended to use IO emulation for I2C.

Note: Requires MaixPy image and firmware > 4.1.2 (not included)

IO Emulation I2C

To emulate I2C, you only need to use the GPIO functionality for the pins. On MaixCAM, the emulated I2C is fixed to pins A15 (SCL) and A27 (SDA), with the i2c number being 5. To use it, simply:

from maix import i2c, pinmap

# pinmap.set_pin_function("A15", "GPIOA23")
# pinmap.set_pin_function("A27", "GPIOA24")

bus1 = i2c.I2C(5, i2c.Mode.MASTER)
slaves = bus1.scan()
print("find slaves:", slaves)

More API visit i2c API doc

Hardware I2C

As mentioned above, for MaixCAM, hardware I2C and WiFi are mutually exclusive. If you must use hardware I2C, you need to disable WiFi and use the pinmap module to set the pin functions to I2C, then use the maix.i2c module to operate.

TODO: Provide a method to disable WiFi (requires disabling the WiFi driver in the system, which is relatively complex)

Hardware I2C and its correspond pin see:

from maix import i2c, pinmap

pinmap.set_pin_function("P18", "I2C1_SCL")
pinmap.set_pin_function("P21", "I2C1_SDA")

bus1 = i2c.I2C(1, i2c.Mode.MASTER)
slaves = bus1.scan()
print("find slaves:", slaves)

UART

PWM