Compute Module • Re: CAM1 not working on a custom board with a CM4

i2c-10 would normally be on GPIOs 44&45.
Prove your wiring by attaching an oscilloscope to those 2 GPIOs, and using "pinctrl set 44,45 op dh", and "pinctrl set 44,45 op dl" to set it high and low respectively.

If proved, then after an "i2cdetect -y 10" I would expect "pinctrl get 44,45" to return SDA and SCL (I've not got a Pi4 booted to give the exact text).

The oscilloscope has some waves on 44 and 45 but changing high to low doesn't change anything.
i2cdetect -y 10 returns all --.

Code:

44: op -- pn | lo // SDA0/GPIO44 = output45: op -- pn | lo // SCL0/GPIO45 = output

and

Code:

44: op -- pn | hi // SDA0/GPIO44 = output45: op -- pn | hi // SCL0/GPIO45 = output

Statistics: Posted by 6by9 — Wed Nov 27, 2024 11:58 am