Problem Configuring P0.09 pin as SCL TWI

RE: Problem Configuring P0.09 pin as SCL TWI

Muhammad Nabeel — Tue, 21 May 2019 13:45:52 GMT

Thanks

RE: Problem Configuring P0.09 pin as SCL TWI

Simonr — Tue, 21 May 2019 13:36:01 GMT

Hi Muhammad

Yes you can, although it will be easier just using another pin for the SCL pin.

To set P0.09 as a regular GPIO, do as the user guide says and cut SB23, then configure P0.09 as a regular GPIO in your software.

If you need the UART you could always revert these changes, as this would be easiest. You can also connect another pin to the side of SB23 that is connected to the interface MCU and configure that pin as the TXD pin if you want a permanent change.

Best regards,

Simon

RE: Problem Configuring P0.09 pin as SCL TWI

Muhammad Nabeel — Tue, 21 May 2019 13:20:35 GMT

Can I change the uart pin?

RE: Problem Configuring P0.09 pin as SCL TWI

Simonr — Tue, 21 May 2019 11:59:02 GMT

Hi Muhammad

This is because pin 0.09 is by default used by the UART connected to the interface MCU. Please see chapter 5.2 Virtual COM port in the nRF51DK user guide for more info. The easiest solution would be to use another pin for this functionality to keep the Virtual COM port function as well.

Best regards,

Simon