TWI SCL and SDA pins 7 and 6 not working on NRF52

[Sri_guy]

Hello,

I built a simple I2C application for the LMP91000 and I was successfully able to configure it to read the status register.

However, I tested to see if I could use pin 6 and 7 for SCL and SDA respectively. However, when I did, nothing happened. When I tested it on other GPIO pins it worked well.

I then saw that P0.06 and P0.07 is used for TXD and CTS respectively from the guide on the back on the NRF52. Is there any way to go around this?

Thanks.

[Cooper]

Hi

I have the same problem. The twi pin assignment like yours. The only difference is I use pure nrf52832, not development kit. P0.7->SCL, P0.6->SDA, and the setting not working.

But when I switch pin assignment, P0.7->SDA, P0.6->SCL. And it works!!

And I also try (P0.8->SCL, P0.6->SDA) & (P0.7->SCL, P0.5->SDA), the twi function not working too.

I guess it is a defect on nrf52832. Can any body confirm this issue?

[RK]

of course it's not a defect on the nrf52832, all the pins work perfectly for TWI and other functions. So you have a bug in your code or a hardware issue outside the chip.

[Electronics111]

Clearly it IS a defect, I have the exact same problem with default (example twi) code, why else would it work with the pins one way round but not the other?!!

[bjorn-spockeli]

@electronics111: There are no known issues with P0.06 and P0.07 regarding TWI.

[Electronics111]

Now resolved due to delving deep into the documentation and config options. If you have this problem, try turning off NRF_LOG_BACKEND_SERIAL_USES_UART in the sdk_config.h. For some reason this causes this weird issue where it works backwards but not the other way.