GPIO 24 voltage high low status

[Newbie]

Hello,

I am using sdk 12.2.2 and nrf52 customised board. Now my challenge is as follows.

When I am adding this in my code.

nrf_gpio_cfg_output(26);
nrf_gpio_pin_write(26, 1);

pinread1 = nrf_gpio_pin_out_read(26);
NRF_LOG_INFO("pinread status 26 %d \r\n", pinread1);

I am getting pinread1 status as 1 in logs but when I am manually checking the status of this pin with  multimeter I am getting 1.2V. My battery is providing 2.8V.

What can be the issue in this?

Thanks,

[Håkon Alseth]

Hi,

 

GPIO P0.26 is pin 38 on the mechanical package (QFN48) of the nRF52832. Are you sure you're checking the correct pin?

 

Best regards,

Håkon

[Newbie]

Yeah we am sure we are checking correct pin. We are using WLCSP Pakagae. But we are sure that we are checking correct pin.

Thanks,

[Newbie]

Hi,

I am not using this pin for anything else. I am simply calling log init function and then I am calling gpio functions. Also in scope the output waveform is flat 1.2V.

Thanks,

[mon2]

WLCSP packages are small. How good is your contract manufacturer? Can you inspect the WLCSP (xray) for any possible shorts?

[mon2]

If you output a low ("0"), does this port pin go low?

[Newbie]

Hi,

No, still this pin gives me 1.2 V .

Thanks,

[Newbie]

Hi ,

I am waiting for the solution to this challenge.

Thanks,

[hmolesworth]

You are using standard drive if using the defaults, like this:

__STATIC_INLINE void nrf_gpio_cfg_output(uint32_t pin_number)
{
    nrf_gpio_cfg(
        pin_number,
        NRF_GPIO_PIN_DIR_OUTPUT,
        NRF_GPIO_PIN_INPUT_DISCONNECT,
        NRF_GPIO_PIN_NOPULL,
        NRF_GPIO_PIN_S0S1,
        NRF_GPIO_PIN_NOSENSE);
}

As a test, give it some wellie; if the voltage doesn't increase something is clamping it perhaps

    nrf_gpio_cfg(LED_GREEN_PIN,           // 24 eg. LED_GREEN
                 NRF_GPIO_PIN_DIR_OUTPUT,
                 NRF_GPIO_PIN_INPUT_DISCONNECT,
                 NRF_GPIO_PIN_NOPULL,
                 NRF_GPIO_PIN_H1S0,       // Require High Drive high level
                 NRF_GPIO_PIN_NOSENSE);

You could also add NRF_GPIO_PIN_PULLUP; if that increases the voltage you may have lost the FET to 2.8V on that pin. As an aside, I use that pin on the same package without issue. Also nrf_gpio_pin_out_read() does not of course read the status of the actual hardware pin, just the output register bit which is supposed to drive the pin.