[riot-notifications] [RIOT-OS/RIOT] shell: Add command i2c_scan (#11240)

Marian Buschsieweke notifications at github.com
Sat Mar 23 08:37:28 CET 2019

> One thing to note would be maybe we should only test the available devices (0x0E to 0x77).

Hmm, this would only save little time, the whole scan is done in less than a second when clock is at "normal speed". But for every new I2C driver this tool would need to be checked and potentially updated to also include the new address. And maybe the user does want to scan for not yet supported devices?

> I remember some issue not being able to reset the nack flag without write byte command on the cc2538 but I just tested and it works pretty well.

I also noticed some surprising things when I used `i2c_read_bytes()` with a length of zero. I had to at least read one byte of data for the tool to work on STM32F3.

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