I generated an overlay file with the following info:
// To get started, press Ctrl+Space to bring up the completion menu and view the available nodes.
// You can also use the buttons in the sidebar to perform actions on nodes.
// Actions currently available include:
// * Enabling / disabling the node
// * Adding the bus to a bus
// * Removing the node
// * Connecting ADC channels
// For more help, browse the DeviceTree documentation at https://docs.zephyrproject.org/latest/guides/dts/index.html
// You can also visit the nRF DeviceTree extension documentation at https://docs.nordicsemi.com/bundle/nrf-connect-vscode/page/guides/ncs_configure_app.html#devicetree-support-in-the-extension
&gpio0 {
status = "okay";
};
&gpiote {
status = "okay";
};
/ {
leds {
compatible = "gpio-leds";
yellow_led: led {
label = "led";
gpios = <&gpio0 6 0>;
};
};
};
and there is my main.c file:
// have some useful utility functions provided by zeyphr kernal.
#include <zephyr/kernel.h>
// include the GPIO driver
#include <zephyr/drivers/gpio.h>
// get the gpio pin properties from the .overlay file
static struct gpio_dt_spec led = GPIO_DT_SPEC_GET(DT_NODELABEL(yellow_led), gpios);
int main(void)
{
// check if the pin is ready to use (the function returns 0 if everything is ok)
if(!gpio_is_ready_dt(&led))
{
// end the program
return 0;
}
// check if the pin is configured successfully (the function returns 0 if everything is ok)
if(gpio_pin_configure_dt(&led, GPIO_OUTPUT_INACTIVE) < 0)
{
// end the program
return 0;
}
// loop infinitely
while(1)
{
// toggle the led and check if it was toggled successfully
if(gpio_pin_toggle_dt(&led) < 0)
{
return 0;
}
// sleep for 1 second
k_msleep(1000);
}
return 0;
}
However, when I tried to debug my code to understand what was wrong, I got the following value of the led variable at the start of the main:
$1 = {port = 0x395f <notify_monitors+40>, pin = 0 '\000', dt_flags = 0}
which is incorrect because the pin value should be 6 not 0.
