pin set issue when direction as output pin

[kirt]

hi

I need to set a pin high when i make a connection to the device .so i set to output direction in main.c file.i have include gpio.h and nrf_delay.h file in main file

 nrf_gpio_pin_dir_set(29,NRF_GPIO_PIN_DIR_OUTPUT); //red led

nrf_delay_ms(100);

then i set the pin in ble_evt_handler as

case BLE_GAP_EVT_DISCONNECTED:
nrf_gpio_pin_clear(29);
SEGGER_RTT_printf(0,"Disconnected\n");

break;

case BLE_GAP_EVT_CONNECTED:
nrf_gpio_pin_set(29);
SEGGER_RTT_printf(0,"Connected..\n");
err_code = bsp_indication_set(BSP_INDICATE_CONNECTED);
APP_ERROR_CHECK(err_code);
m_conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
break;

though i have set pin ,this pin gets cleared when i connect device using nRF connect (i.e exactly reverse action happens).i have checked that assiging pin as output sets high on this pin 

where could be the problem?

[RK]

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. 

[kirt]

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

[RK]

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. 

[kirt]

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

[Håkon Alseth]

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

[kirt]

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 

[Håkon Alseth]

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