Why I cannot set some GPIO high or low?

[frank zhang]

I just get DK P10040, I am using SDK_11.0.0_89a8197/s132_nrf52_2.0.1_softdevice. I tried ble_app_uart, it works. But I find a problem, I cannot set P0.09/10/12/13 high or low, but other pins can be done.

And if I connect probe with P0.13, DK board will reset immediately.

Below is part of code.

//Init
nrf_gpio_range_cfg_output(8, 31); 

//Set gpio
static void nus_data_handler(ble_nus_t * p_nus, uint8_t * p_data, uint16_t length)
{
    uint32_t         err_code;
	uint32_t     i;
	uint8_t buffer[20];

switch(p_data[0])
{
case 'D':
	{
		uint8_t temp;
		temp = (p_data[1]-0x30)*10 +(p_data[2]-0x30);
		nrf_gpio_pin_clear(temp);// set low
	}
			break;

	case 'U':
	{
		uint8_t temp;
		temp = (p_data[1]-0x30)*10 +(p_data[2]-0x30);
			nrf_gpio_pin_set(temp);// set high
	}
			break;
				
	default:
		break;
}

Somebody can let me know what is the problem?

[Thangaraj]

Hi Pin9 and Pin 10 are NFC pins You need to disable NFC to use that as GPIO ..

Refer:-

devzone.nordicsemi.com/.../

[Ole Bauck]

You will also need to solder a 0 ohm resistor on R27 and R28 to connect P0.09 and P0.10 to the pin header, see schematic in the hardware files.