pin set issue when direction as output pin

RE: pin set issue when direction as output pin

Håkon Alseth — Wed, 18 Apr 2018 14:51:21 GMT

This is how you've setup the connection to the LED on your hardware, so; yes, it is correct.

RE: pin set issue when direction as output pin

kirt — Wed, 18 Apr 2018 14:00:00 GMT

am doing wrong/right?

when i give gpio pin direction as output LED light up

when pin is set led turns off

when pin is cleared turns on

RE: pin set issue when direction as output pin

Håkon Alseth — Wed, 18 Apr 2018 13:47:54 GMT

By setting the GPIO direction to OUTPUT, the reset (default) value will be low (ie: logical zero -> GND), and thus the LED will light up, as you're sinking current through the GPIO.

Cheers,

Håkon

RE: pin set issue when direction as output pin

kirt — Wed, 18 Apr 2018 09:39:49 GMT

just by giving only direction as output this LED becomes ON.I didnot set or clear

RE: pin set issue when direction as output pin

RK — Wed, 18 Apr 2018 06:18:05 GMT

so there you go - with that wiring the LED will come ON when the pin is LOW and goes OFF when the pin is HIGH. So there's nothing wrong here.

RE: pin set issue when direction as output pin

kirt — Wed, 18 Apr 2018 06:14:14 GMT

i am using RGB led,amoung these i am using pin 29 to which red LED connected

RE: pin set issue when direction as output pin

RK — Sun, 15 Apr 2018 01:23:35 GMT

and how is the LED wired?

RE: pin set issue when direction as output pin

kirt — Sat, 14 Apr 2018 08:20:21 GMT

i am checking LED status when i provide logic high n logic low.

By writting only this nrf_gpio_pin_dir_set(29,NRF_GPIO_PIN_DIR_OUTPUT);

pin no.29 gets set LED connected to pin 29

RE: pin set issue when direction as output pin

RK — Sat, 14 Apr 2018 08:15:28 GMT

What are you using to measure the pin being high or low? I see the word "LED" in the code, if you're using one of the Nordic boards, their LEDs come ON when the pin is low and go OFF when it's high.