Keyboard gpio init code , pins set as output but pull up/down resistor disable.

RE: Keyboard gpio init code , pins set as output but pull up/down resistor disable.

Kenneth — Thu, 14 Jun 2018 09:07:22 GMT

If you look at for instance the configuration register for the first GPIO:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/gpio.html?cp=2_1_0_19_2_9#register.PIN_CNF-0

If you set DRIVE fields to S0S1, then it's a normal push-pull, if you for instance set S0D1, then it will be open drain (you may enable internal pull or use external).

RE: Keyboard gpio init code , pins set as output but pull up/down resistor disable.

Ralph — Thu, 14 Jun 2018 00:37:45 GMT

If I enable the pull-up/down resistor, it would become open-drain?

Thanks!

RE: Keyboard gpio init code , pins set as output but pull up/down resistor disable.

Kenneth — Wed, 13 Jun 2018 15:48:54 GMT

Both are possible through configuration, but in this case push-pull.

RE: Keyboard gpio init code , pins set as output but pull up/down resistor disable.

Ralph — Wed, 13 Jun 2018 11:16:20 GMT

Hi, Kenneth

What method nrf52832 using to set low or high?

push-pull or open-drain?

Thanks

RE: Keyboard gpio init code , pins set as output but pull up/down resistor disable.

Kenneth — Wed, 13 Jun 2018 11:11:13 GMT

All GPIO's can be set logic low (GND) or high (VDD), with or without pull up/down resistors:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/gpio.html?cp=2_1_0_19#concept_zyt_tcb_lr