nRF52840 configure P0.0 and P0.1 as GPIO

[Nhuan]

Hello,

I would like to use P0.0 and P0.1 as General GPIO for I2C in nRF52840.

I have run the twi_sensor example in SDK 17, it works well with ARDUINO_SCL_PIN and ARDUINO_SDA_PIN, but when I set 

.scl                = NRF_GPIO_PIN_MAP(0, 1),

.sda               = NRF_GPIO_PIN_MAP(0, 0),

the transmission isn't success.

May I ask how can I configure P0.0 and P0.1 as GPIO for TWI (I'm using nRF52840 DK)?

Thank you!

[Turbo J]

Bad idea, that is where the 32.768kHz crystal is connected to. Pretty sure that this component is populated on the DK.

Most examples enable this crystal and you cannot use pins with more than 1 peripherial at a time.

[Nhuan]

Cause I have a custom board and it doesn't not use the 32.768kHz crystal.

Do you think I can use those pins on my board for TWI?