Slow time-to-enable GPIO using Connect SDK on nRF52832

RE: Slow time-to-enable GPIO using Connect SDK on nRF52832

Jared — Thu, 11 Aug 2022 06:55:01 GMT

Great,

Keep me updated!

regards

Jared

RE: Slow time-to-enable GPIO using Connect SDK on nRF52832

Anthony W — Wed, 10 Aug 2022 18:09:28 GMT

Thank you, this looks promising. I haven't had a chance to try this yet since the J-Link OB interface seems to have gotten corrupted on the dev board, but once I fix this I'll try it and let you know if it worked.

RE: Slow time-to-enable GPIO using Connect SDK on nRF52832

Jared — Mon, 01 Aug 2022 10:20:10 GMT

Hi,

Could you try to use the SYS_INIT function as in this example? That would set the GPIO much earlier during boot. You might have to write directly to the GPIO register instead of using the driver as it might not be available at that stage. Here is documentation for the function. I think this method would reduce the delay considerably.

regards
Jared

RE: Slow time-to-enable GPIO using Connect SDK on nRF52832

Anthony W — Fri, 29 Jul 2022 17:37:08 GMT

I define it in an overlay:

/ {
    gpiocustom {
        compatible = "gpio-keys";
        gpiocus0: gpiocus_0 {
            gpios = <&gpio0 27 (GPIO_ACTIVE_HIGH | GPIO_PULL_DOWN)>;
            label = "Custom gpio 28";
        };
    };
    aliases {
        gpiocus0 = &gpiocus0;
    };
};

I'm using the u-blox BMD-350 module embedded in the BMD-35-EVK development board (ubx_bmd300eval_nrf52832 spec). Power (1.8V) is applied directly to the module via the external power header.

Source file is pretty simple. It enables the GPIO and blinks an LED.

#include <zephyr.h>
#include <drivers/gpio.h>

#define SLEEP_TIME_MS   1000

#define LED0_NODE DT_ALIAS(led0)
#define EN_1V8_NODE DT_ALIAS(gpiocus0)

static const struct gpio_dt_spec led = GPIO_DT_SPEC_GET(LED0_NODE, gpios);
static const struct gpio_dt_spec en_1v8 = GPIO_DT_SPEC_GET(EN_1V8_NODE, gpios);

void main(void)
{
	int ret;

	if (!device_is_ready(led.port)) return;
	if (!device_is_ready(en_1v8.port)) return;

	if (gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE) < 0) return;
	if (gpio_pin_configure_dt(&en_1v8, GPIO_OUTPUT_ACTIVE) < 0) return;

	while (true) {
		ret = gpio_pin_toggle_dt(&led);
		if (ret < 0) {
			return;
		}
		k_msleep(SLEEP_TIME_MS);
	}
}

RE: Slow time-to-enable GPIO using Connect SDK on nRF52832

Jared — Fri, 29 Jul 2022 11:23:07 GMT

Hi,

Can you specify where you are setting the GPIO? In main()?

regards
Jared