[riot-notifications] [RIOT-OS/RIOT] Wrong I2C address for ATECC (cryptoauthlib) (#14001)

Peter Kietzmann notifications at github.com
Mon May 4 15:11:22 CEST 2020

>  I only get some kind of response with I2C_SPEED_FAST. I2C_SPEED_NORMAL results in no response at all.

This is [expected](https://github.com/RIOT-OS/RIOT/blob/master/pkg/cryptoauthlib/doc.txt#L57). #13412 will improve this.

> When you look in the physical result on the I2C bus, it results in 0xC1 and the crypto IC is not sending an ACK.

This is just an interpretation of the tool. We have 7-bit addressing in place and the 8th bit indicates read/write (read=1 in this case).

Did you try the I2C address scanner?

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