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dey-examples/apix-i2c-example/README.md

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Digi APIX I2C Sample Application

Sample application to access and manage I2C slaves using the Digi APIX library.

The application writes a page of an external EEPROM memory with random data and then reads the data back to validate it (tested with 24FC1026).

The I2C connections for the sample depend on the running platform:

  • CCIMX6 SBC: I2C connector of the board.
    • VCC: Pin 3
    • GND: Pin 6
    • I2C-3 SDA: Pin 2
    • I2C-3 SCL: Pin 1
  • CCIMX6Plus SBC: I2C connector of the board.
    • VCC: Pin 3
    • GND: Pin 6
    • I2C-3 SDA: Pin 2
    • I2C-3 SCL: Pin 1
  • CCIMX6UL SBC Express: Expansion connector of the board.
    • VCC: Pin 1
    • GND: Pin 6
    • I2C-1 SDA: Pin 3
    • I2C-1 SCL: Pin 5
  • CCIMX6UL SBC Pro: I2C connector of the board.
    • VCC: Pin 3
    • GND: Pin 6
    • I2C-2 SDA: Pin 2
    • I2C-2 SCL: Pin 1

Running the application

Once the binary is in the target, launch the application:

# ./apix-i2c-example
Example application using libdigiapix I2C support

Usage: apix-i2c-example <i2c-bus> <i2c-address> <address-size> <page-size> <page-index>

<i2c-bus>       I2C bus index to use or alias
<i2c-address>   Address of the I2C EEPROM memory
<address-size>  Number of EEPROM memory address bytes
<page-size>     EEPROM memory page size in bytes
<page-index>    EEPROM memory page index to use

Aliases for I2C can be configured in the library config file

If no arguments are provided, the example will use the default values:

  • For the interfaces, default values are configured in "/etc/libdigiapix.conf"
  • Specific application default values are defined in the main file.

Compiling the application

This example can be compiled using a Digi Embedded Yocto based toolchain. Make sure to source the corresponding toolchain of the platform you are using, e.g:

$> . <DEY-toolchain-path>/environment-setup-cortexa7hf-vfp-neon-dey-linux-gnueabi
$> make

More information about Digi Embedded Yocto.

License

Copyright 2017, Digi International Inc.

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.