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I2C

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Alexander Hiam edited this page Apr 17, 2015 · 2 revisions

This library allows you to communicate with I2C devices. The BeagleBone Black (BBB) has two exposed I2C buses.

####I2C1 :

  • SCL : P9_17
  • SDA : P9_18

####I2C2 :

  • SCL : P9_19
  • SDA : P9_20

The 2 I2C buses are accessed through the pre-initialized objects I2C1 and I2C2.

##API

####I2Cn.open(use_10bit_address=False): Initialize the I2C bus interface. If the optional argument use_10bit_address=True the bus will use 10-bit slave addresses instead of 7-bit addresses.

####I2Cn.close(use_10bit_address=False): Closes the I2C bus interface.

####I2Cn.read(slave_addr, n_bytes): Reads n_bytes words from the I2C slave device with the given address and returns them as a list.

####I2Cn.readTransaction(slave_addr, tx_byte, n_bytes) Writes tx_byte then immediately reads n_bytes words from the I2C slave device with the given address and returns them as a list.

####I2Cn.write(slave_addr, [bytes]) Writes the given list of bytes to the I2C slave device with the given address. Only integers in the range [0,255] are valid.

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