micro:bit nrf51822 can not set GPIO:30 to TWI0.PSELSDAhttps://devzone.nordicsemi.com/f/nordic-q-a/29948/micro-bit-nrf51822-can-not-set-gpio-30-to-twi0-pselsdaHello Nordic Devzone, I have problems with twi/i2c init code on a Micro:bit, nrf51822. The accelerometer is a Freescale MMA8652FC. I use Segger Embedded Studio for ARM V3_34 64-bit. The accelerometer works fine with codes from makecode.microbiten-USTelligent Community 13Tue, 30 Jan 2018 08:13:18 GMTRE: micro:bit nrf51822 can not set GPIO:30 to TWI0.PSELSDAhttps://devzone.nordicsemi.com/thread/119108?ContentTypeID=1Tue, 30 Jan 2018 08:13:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1c8f7fb6-5e17-42b0-bf7a-e3c078c30bf1dmarschal<p>Thank you so much for your help! It worked (-:</p><div style="clear:both;"></div>RE: micro:bit nrf51822 can not set GPIO:30 to TWI0.PSELSDAhttps://devzone.nordicsemi.com/thread/119107?ContentTypeID=1Mon, 29 Jan 2018 12:37:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4928d4ae-4b1e-493d-be10-60a380e91486J&#248;rgen Holmefjord<p>You should write the <strong>pin number</strong> to the PSELSCL/PSELSDA registers, not the GPIO mask. The register take values 0 to 31, as described in the documentation.</p><div style="clear:both;"></div>