I2C1 has decided to stop working?

[NicRoberts]

NUCLEO WB55

For an unknown reason I2C1 has just stopped working. The BLE & UART are working but the boards (I've tested on 2 identical boards) are no longer talking to the sensors via I2C.

When I scope them up the traces for SCL & SDA are both flat lines (yes I checked the scope is working properly).

Frustratingly, this all worked before xmas.

Anyone any clue what could cause this?

[Andrew Neil]

Some more details of your setup would help:

How to write your question to maximize your chances to find a solution

 

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@NicRoberts wrote:

Frustratingly, this all worked before xmas.

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So what have you changed between then & now ?

 

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@NicRoberts wrote:

SCL & SDA are both flat lines

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High or low?

Can you toggle them just as plain GPIOs

[NicRoberts]

Found it just now, a short across SDA & SCL seems to have blown I2C1, I2C3 and everything else is working fine.