Inter-Integrated Circuit (I2C) is a synchronous, serial hardware bus communication protocol used for intra-board (short distance) communication i.e. between two components on a circuit board. It is a 2-wire bus. It is also used in EEPROMs for example to read and write data.
The current implementation is dependent on the pyi2cflash package which in turn is dependent on pyftdi package. Note that there will be some extra info printed on the console, when the plugin executes, which comes from the pyi2cflash package and is not part of the plugin code. To interface your PC with the I2C EEPROM chip, you need a hardware connector or bridge. You can use any FTDI based device, that provides an I2C interface. We have created a multi-protocol connector called EXPLIoT Nano which is available at our online store. Although, the framework should work with any pyftdi compatible FTDI device.
The scan will be performed over the available address space of the I2C bus to detect connected units.
ef> run i2c.generic.scan -h
Environmental sensors are often connected to the I2C bus and used in a large scale in the IoT and home automation eco-system. To get a feeling how the test works, a BMP280 breakout board is wired to a Expliot-NANO.
+---------+ +-----------------+ | | VCC +--------+ 3V3 | | | BMP280 | | | | | GND +--------+ GND | Expliot-NANO | | | | | | | SCL +--------+ SCL | | | | | | | | SDA +-----+--+ SDA | | +---------+ | | | +--+ SDA | | +-----------------+
For further details check the pin layout.
ef> run i2c.generic.scan [...] [*] Scanning for I2C devices... [+] Address found: 0x76 [+] Done. Found 1 and not found 120 [+] Test i2c.generic.scan Passed
This test is reading data from an EEPROM. Currently the following chips are supported:
ef> run i2c.generic.readeeprom -h
i2c.generic.readeeprom as the same details apply for writing.
ef> run i2c.generic.writeeeprom -h