after set GPIO pin as active low exception fatal error occurred in debugging mode

RE: after set GPIO pin as active low exception fatal error occurred in debugging mode

Håkon Alseth — Tue, 07 May 2024 07:53:38 GMT

Happy to help out, Tina.

Hope you have a wonderful day!

Kind regards,

Håkon

RE: after set GPIO pin as active low exception fatal error occurred in debugging mode

yithwe — Tue, 07 May 2024 07:32:48 GMT

Hi Hakon

Thanks for your reply.

Best Regards

Tina

RE: after set GPIO pin as active low exception fatal error occurred in debugging mode

Håkon Alseth — Tue, 07 May 2024 07:17:50 GMT

Hi,

Those are defines that define the polarity of the GPIO in DT.

They are not defined as you'd think:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.5.99-ncs1-1/include/zephyr/dt-bindings/gpio/gpio.h#L26

Use bitwise '0' or '1' instead.

Kind regards,

Håkon

RE: after set GPIO pin as active low exception fatal error occurred in debugging mode

yithwe — Tue, 07 May 2024 03:39:54 GMT

Hi Hakon

It's OK, but what is difference between set as zero or GPIO_ACTIVE_LOW, I test for setting GPIO_ACTIVE_LOW, it's can't really pull pin to low.

Best Regards

Tina

RE: after set GPIO pin as active low exception fatal error occurred in debugging mode

Håkon Alseth — Mon, 06 May 2024 12:49:27 GMT

Hi,

Looks like there's a couple of steps missing, for instance the configuration.

Here's what I used:

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

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

const struct gpio_dt_spec output_gpio = GPIO_DT_SPEC_GET(DT_NODELABEL(custom_device), out_gpios);
const struct gpio_dt_spec input_gpio = GPIO_DT_SPEC_GET(DT_NODELABEL(custom_device), in_gpios);

int main(void)
{
	printf("Hello World! %s\n", CONFIG_BOARD);
	if (!device_is_ready(output_gpio.port))
	{
		printk("Output GPIOs not ready\n");
		return;
	}
	if (gpio_pin_configure_dt(&output_gpio, GPIO_OUTPUT) != 0) {
		printk("Output configure failed\n");
	}

	printk("Output pin %d\n", output_gpio.pin);
	printk("Input pin %d\n", input_gpio.pin);
	while (1) {
		gpio_pin_set(output_gpio.port, output_gpio.pin, 0);
		k_msleep(3000);
		gpio_pin_set(output_gpio.port, output_gpio.pin, 1);
		k_msleep(3000);
	}


	return 0;
}

Could you try this and see if that works better?

Kind regards,

Håkon