Welcome to i2ccom rev.0.1 by Kadir Mueller in 2017.

 i2ccom gives you access to I2C-devices over USB. All you need is an AVR with
serial access to it -- for example an Arduino board. By connecting some
terminal program to it, you can issue simple commands to control the hardware
I2C-bus of your controller.
 I'm using i2ccom mainly for debugging I2C-busses. It's just for connecting
some I2C-bus anywhere in our home to an Arduino Nano-board which in turn has
its console port plugged into some Laptop's USB-port.
 i2ccom has an hardcoded default baudrate (9600); you may change it in the
Makefile. You may also want to change the default chip address (0x50), the
MCU (atmega328p) and the clock rate (16MHz, 16000000).

Available commands:
  ls                LiSt addresses with devices.
  cd I2C-ADDR       Change current Device to ADDRess.
  start             Issue a start-condition to current device.
  stop              Issue a stop-condition to the bus.
  rd8 ADDR (COUNT)  ReaD COUNT bytes at 8bit-ADDRess from current device.
  rd16 ADDR (COUNT) ReaD COUNT bytes at 16bit-ADDRess from current device.
  rd                ReaD a Byte from current device without issuing start/stop.
  wr8 ADDR BYTE...  WRite at least one BYTE at 8bit-ADDRess of current device.
  wr16 ADDR BYTE... WRite at least one BYTE at 16bit-ADDRess of current device.
  wr BYTE           WRite BYTE to current device without issuing start/stop.
  hex               Switch output to HEX.
  dec               Switch output to DEC.
  lic               Show license.
  help              This help.

Examples:
i2c:0x50# 
This is the default prompt, showing that everything should be issued to address
0x50.

i2c:0x50# ls
0x2a 0x50 0x68 
Your controller responds to 'ls' with three addresses of currently connected
devices.

i2c:0x50# cd 0x68
You're changing the current address to 0x68. I2ccom would show you an error if
there's nobody listening.

i2c:0x68# rd8 0 8
>0x00 54 23 00 08 00 00 00 00 
Starting from address 0, read 8 bytes and show them.

i2c:0x68# cd 0x50
i2c:0x50# wr16 0 0xde 0xad 0xbe 0xef
Change current address to 0x50 and write the 4-byte-sequence 0xde 0xad 0xbe 0xef
starting at address 0.


 i2ccom uses the TWI-Master library by Peter Fleury. I've used twimaster.c
and i2cmaster.h.

 Please see http://www.theflatnet.de/i2ccom/ for license and more information.