i2c troubleshooting

[ahito89]

Hello,
I've used your code to power my dactyl keyboard and it works fine on serial, but I just couldn't get it to work on i2c. Is there anyway to troubleshoot that?
Thanks and great job on the fork.

[ahtn]

Are you using the code from the master branch? The i2c code from the c44 branch is broken.

Here's a split-test-i2c.hex you can use to check if your wiring is right. Make sure to flash it to both halves.

• Check the TX LED (next to pins 14,16) on the promicro which has the USB cable plugged in. It will light up when it cannot detect an I2C connection.
• Check your wiring and the pull-up resistors for i2c.

[ahito89]

Hello,
I've flashed both halves with the provided hex files and the TX LED lights up, checked the wiring, but I could not figure out what's wrong. It works on the serial connection though. Isn't the serial connection enough for a split keyboard? What's the advantage of using i2c?

[ahtn]

In theory it's faster, but you should not be able to notice this in practice.

You don't really need to use i2c, unless you:

• want to do a 3+ way split keyboard
• want to send lots of data between the halves (e.g. per key LED matrix control information.)

[ahito89]

I see, well for a dactyl keyboard serial will suffice. Thanks for your help :)