gpio output voltage control

RE: gpio output voltage control

hmolesworth — Thu, 07 Jun 2018 15:12:44 GMT

Is the nRF52832 you are using on the nRF52 dev board by any chance? If so the SAM3U2 may be holding P0.06 which is connected as the Rx line (as Kenneth indicated). If this is a custom board you could try paralleling another high-drive pin, but as the Enable Pin only requires 1mA (which is a lot) I agree you should already be within specification. In the code above nrf_gpio_cfg_output(6); is now redundant of course

RE: gpio output voltage control

TTN — Thu, 07 Jun 2018 12:13:50 GMT

Hi, thanks for reply.

I have add the gpio_cfg in my project.

nrf_gpio_cfg_output(6);
nrf_gpio_cfg(6, // P0.6
NRF_GPIO_PIN_DIR_OUTPUT,
NRF_GPIO_PIN_INPUT_DISCONNECT,
NRF_GPIO_PIN_NOPULL,
NRF_GPIO_PIN_S0H1, // Require High Drive high level
NRF_GPIO_PIN_NOSENSE);
nrf_gpio_pin_set(6);

But the voltage value still at 1.94v , before or after the code been added.

I'm still curious why the Voh's min. value not VDD-0.4, when my input vdd is 2.8v.

RE: gpio output voltage control

hmolesworth — Tue, 05 Jun 2018 17:35:41 GMT

Try increasing the high level output drive current on that pin, assuming the pin is not already in use elsewhere:

   nrf_gpio_cfg(6,                       // P0.6
                NRF_GPIO_PIN_DIR_OUTPUT,
                NRF_GPIO_PIN_INPUT_DISCONNECT,
                NRF_GPIO_PIN_NOPULL,
                NRF_GPIO_PIN_S0H1,       // Require High Drive high level
                NRF_GPIO_PIN_NOSENSE);

RE: gpio output voltage control

Kenneth — Tue, 05 Jun 2018 12:59:12 GMT

The value you refer to state that is you can sink up to 3mA from the GPIO. Do you know the sink current from P0.06?

Is it possible that P0.06 is configured for other purpose in your project? For instance it typically may be used for debugging (UART) in the SDK projects.