NRF52810 Softdevice S112, GPIO P14 OUTSET failure after SD enabled

[snoopy20]

I think I may have found errata. Using the combination in the title I can enable output, verified at the pin using OUTSET. Once the softdevice is enabled the same command fails to set the pin. You can see this in the screenshot where I've moved it below the SD command that induces the error.

I haven't tested other pins as it's difficult to do on a pre-production board. 

I've scoured the web and can't find anything about this pin being blocked, indeed SD is not supposed to touch GPIO at all. 


 

[Jared]

Hi,

Exactly what error do you get? I tried reproducing this but wasn't able to see any errors. Also, what SDK and Softdevice version are you using? 

regards

Jared

[snoopy20]

I don't see any errors, but there's no output on the pin when attempting to set after enabling SD.

Versions - SD7.2, SDK 16

[Jared]

Hi there,

Are you using a custom board or a development kit? If the former, is there any external pullups or pulldowns connected to the pin? The correct way of setting a pin:

nrf_gpio_cfg_output(pin);
nrf_gpio_pin_set(pin);

regards

Jared 

[snoopy20]

Hi, no pull-ups/downs.

I am using direct commands not sdk. These are the two relevant sets.

  NRF_GPIO->PIN_CNF[CFG_PIN_SYSTEM_ACTIVE] = pinDisconnectInputBuffer | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos) | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos);
  
  NRF_GPIO->OUTSET = 1 << CFG_PIN_SYSTEM_ACTIVE;

I'm using a custom pre-production board but that's not relevant.

[Jared]

Hi,

I tried this and it worked fine after enabling the BLE stack:

    NRF_GPIO->PIN_CNF[14] = (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos)
                               | (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
                               | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
                               | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
                               | (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos);



  NRF_GPIO->OUTSET = 1 << 14;

Are you measuring physically on the pad of the pin? What voltage do you measure? Is there anything else connected to the pin?

regards

Jared