nrf51822 GPIO PIN_CNF

[wiz_yoo]

Hello.

I don't know difference of GPIO's input/output direction setting. There is two register for gpio setting.

• DIRSET : Dir set register
• PIN_CNF[n] : Configuration of GPIO pins

If i change direction of GPIO, DIRSET and PIN_CNF are all needs to change?

Best and regards. Thank you.

[Sigurd]

Hi,

You can use both DIRSET and PIN_CNF[n] to configure the direction of a GPIO pin. You don’t have to use both to set the direction, if you use PIN_CNF[n] the DIR registers will be updated, and if you use DIRSET the PIN_CNF[n] will be updated. With PIN_CNF[n] you will be able to configure one individual pin at the time. With DIR, DIRSET and DIRCLEAR you can change the direction of multiple pins at the time.

I recommend to use the GPIO driver functions to configure the GPIO pins.