I2C problems

[Babarskas]

I am using example code TWI_sensor. It is the same code i just switch ports and added couple of lines that would power up my sensor. After running it i can't even clk going through the line consistently, i watching it on scope. Sometimes it runs, but the next time if i stop debugging and start program again i don't see clk.

[Kenneth]

I do not really have any good suggestion than to go back to the default example. Sometimes a sensor require some time to power up, so maybe you need to add some time from powering the sensor before you try to use i2c.

Best regards,
Kenneth

[Babarskas]

Sorry for not replaying sooner, i was a bit under the weather. I am using P0.20 and P0.22 there is no anomalies with these pins? I haven't seen but maybe i missed them.

[Kenneth]

Assuming this is the nRF52840-DK I can see from below the nRF52840-DK that those pins are by default used for the qpsi memory chip, so you may need to cut wires and solder pads if you want to use those in specific. Flip the board and you should see what I mean from the table that is shown there.

Best regards,
Kenneth

[Babarskas]

Sorry i haven't mention. It's a custom board. But maybe these pins are used by something in sdk_config.h file?

[Kenneth]

Could be, but this you check out my suggestion:

I do not really have any good suggestion than to go back to the default example. Sometimes a sensor require some time to power up, so maybe you need to add some time from powering the sensor before you try to use i2c.

[Babarskas]

I just got my nRF52 DK so i will try on it on exect pins from example. Thank you for your time.