Didn't work for me with i2cset -y -a 2 0x00 0x06

Is there a hint how to apply general reset with i2c-tools?

Thanks a lot

All three devices have the same address 0x29. so differentiate slave device address need different i2c address. How to set Slave Device Address in BeagleBone Black.

I recently bought another BeagleBone Black Rev C from Mouser and it was manufactured by GHI. I plugged it into an existing system and installed the SD memory from a functioning system into it and could not see any activity on the I2C bus, nothing. I Swapped it with the BBB originally in the system and that BBB worked fine. I swapped again and the new one still would not communicate over the I2C bus. I tried the new one on two other systems with the same results. I contacted GHI and the sent a replacement. It doesn't work either. Everything on these two new BBB Rev C works fine except this bus.

Since the memory os POP right on top the processor I can't tell it the processor is the same between the old BBB and the new BBB. I suspect that TI may have rev'ed the silicon and this bus is no longer available on these pins.

Any one have any idea what is going on here.

thanks,
john

PRU's are definitly what caught my attention when selecting the beaglebone for their realtime capabilities and potential of using processor heavy tasks with linux to control the PRUSS is really promising. I hope it gets clearer as to how one could tap into the PRUSS as it does not seem to be similar to programming an AVR microcontroller at all.

For changing speeds, you have to update the I2C device tree overlay of the BBB. I have written articles about device tree overlays here.

For real-time communication, you can use the BBB's PRU (programmable real-time unit) which is like a separate microcontroller. Using it isn't easy though and I haven't tried using it with I2C. Maybe I'll write about that in the future.

Thanks for that Roland, I was not aware of that possibility and will start experimenting with it immediately.
How would you set the clock frequency with those commands? Since the slave would only operate at either 400kHz or 1Mhz. I assume real-time communication is not possible with this method on the BBB?

Hi Yasir,

You can always use shell scripts to run bash commands like i2cget, i2cset, etc. I assume you are not familiar with this so let me share a bit.

A typical script contains these:

#!/bin/bash

command1
sudo command2
command3
sudo command4

this is normally a .sh file that you can make executable using

chmod +x script.sh

to run it:

./script.sh

you can also use conditional statements, loops, etc in shell scripts. I would recommend this site: https://www.shellscript.sh/

Hi Roland,

It still seems confusing as to how one can write a program to write to an I2C slave device and control. Command line is great but writing a script that could be run and looped is something that I am still looking into. Any advice?

Glad to hear you were able to solve it Mahmoud. I hope you solve the other problem as well.