NRF52810 Unable to get GPIO output on P0.15.

RE: NRF52810 Unable to get GPIO output on P0.15.

snoopy20 — Mon, 21 Sep 2020 15:09:37 GMT

I've threw everything at it. I'm 100% sure the pin has reflow soldered correctly and I have a trace on the line which suggests it's driven low. I'm not using any of the SDK functionality so the only pin management code I have is -

#define CFG_PIN_SHUTDOWN_AWAKE 15
#define pinDisconnectInputBuffer GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos

NRF_GPIO->PIN_CNF[CFG_PIN_SHUTDOWN_AWAKE] = pinDisconnectInputBuffer | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
NRF_GPIO->OUTSET = 1 << CFG_PIN_SHUTDOWN_AWAKE;

I've also tried swapping the chip.

The only thing I can think off is it's used by default or by debugging by default in some way.

Preprocessor defs are

NRF_LOG_ENABLED=1

DEBUG

DEBUG_NRF

INITIALIZE_USER_SECTIONS

FLOAT_ABI_SOFT

NO_VTOR_CONFIG

NRF52810_XXAA

NRF_SD_BLE_API_VERSION=7

S112

SOFTDEVICE_PRESENT

APP_TIMER_V2

APP_TIMER_V2_RTC1_ENABLED

FLASH_APPSETTINGS_START=0x00027000

FLASH_APPSETTINGS_END=0x00028000

FLASH_BOOTLOADERSETTINGS_START=0x0002F000

RE: NRF52810 Unable to get GPIO output on P0.15.

snoopy20 — Wed, 16 Sep 2020 22:28:09 GMT

I'm not using the SDK and I use the same approach as yourself, plus it works for other pins. It's a strange one, but I've reflowed a second chip with the same outcome. It's as if there's a peripheral using it by default, something that I haven't specifically set. I will remove the chip tomorrow and inspect the board pin, it's all I can think off.

RE: NRF52810 Unable to get GPIO output on P0.15.

Edvin — Wed, 16 Sep 2020 12:53:40 GMT

Hello Andrew,

What are the parameters:

CFG_PIN_SHUTDOWN_AWAKE, pinDisconnectInputBuffer?

Does your implementation work on other pins? Or is it only pin 15 it doesn't work on?

What errata do you refer to?

Are you sure the pin isn't used by anything else? It is by default the pin for button 3. Do you call

I have a project that I use to test small things like these. This worked for me:

custom_pin_test()
{
    NRF_GPIO->PIN_CNF[15] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
    NRF_GPIO->PIN_CNF[17] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
    NRF_GPIO->OUTSET = (1 << 15) | (1 << 17);
}

If you want to test this in an application, you can test this main.c file in the ble_app_uart example from SDK17.0.0:

devzone.nordicsemi.com/.../main.c

NB: If you want to run examples from the SDK on an actual nRF52811, please remember to remove the preprocessor definition: DEVELOP_IN_NRF52832

The example file will toggle the pins 17 and 15 every 1s. It is done in the callback: my_timeout_handler() near the top of the main.c file.

Also note that I commented out buttons_leds_init() in main(), because these will use the pins for the LEDs and buttons by default. If this is not commented out, none of the pins will work as intended.

BR,

Edvin