RE: I want to use P0.09 and P0.10 of nRF52832 as PIN of GPIO(TWI).

Tatsuya-JP — Thu, 04 Mar 2021 23:53:15 GMT

Dear Einar

thank you for the advice.

solved the problem.

RE: I want to use P0.09 and P0.10 of nRF52832 as PIN of GPIO(TWI).

Einar Thorsrud — Tue, 02 Mar 2021 14:38:23 GMT

Hi,

The MDK code will automatically configure the NFC pins as normal GPIO pins when CONFIG_NFCT_PINS_AS_GPIOS is defined for your project. How you do this depends on the toolchain.

For instance if using SES, do like this:

If using make, add this in your Makefile where you set other CFLAGS:

CFLAGS += -DCONFIG_NFCT_PINS_AS_GPIOS

Note that the NFC pins have a quite high capacitance also when used as GPIOs so they are not the best chaise for high frequency usage. Perhaps that could be the issue here? Or what do you mean by communication being unstable? How does the TWI lines look on an oscilloscope? And which frequency do you use?