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+--- Thread: Zephyr Backlight Examples for PineTime (/showthread.php?tid=18206)
Zephyr Backlight Examples for PineTime - lcj - 05-06-2023
This is a very junior question but I am just trying to get the backlight going using Zephyr, VS Code (with nRF Connect for VS Code Add-In), the PineTime DevKit0 board in Zephyr, and a PineTime DK.
I am trying to figure out how to do the backlight from the button example (which replaced the board specific example). I have not been able to get it working. It uses code like this:
Code:
static const struct gpio_dt_spec button = GPIO_DT_SPEC_GET_OR(SW0_NODE, gpios,
{0});
static struct gpio_callback button_cb_data;
/*
* The led0 devicetree alias is optional. If present, we'll use it
* to turn on the LED whenever the button is pressed.
*/
static struct gpio_dt_spec led = GPIO_DT_SPEC_GET_OR(DT_ALIAS(led0), gpios,
{0});
void button_pressed(const struct device *dev, struct gpio_callback *cb,
uint32_t pins)
{
printk("Button pressed at %" PRIu32 "\n", k_cycle_get_32());
}
void main(void)
{
int ret;
if (!device_is_ready(button.port)) {
printk("Error: button device %s is not ready\n",
button.port->name);
return;
}
ret = gpio_pin_configure_dt(&button, GPIO_INPUT);
if (ret != 0) {
printk("Error %d: failed to configure %s pin %d\n",
ret, button.port->name, button.pin);
return;
}
ret = gpio_pin_interrupt_configure_dt(&button,
GPIO_INT_EDGE_TO_ACTIVE);
if (ret != 0) {
printk("Error %d: failed to configure interrupt on %s pin %d\n",
ret, button.port->name, button.pin);
return;
}
...
}These other examples:
pinetime-zephyr/main.c at master · najnesnaj/pinetime-zephyr · GitHub
[/url][url=https://github.com/albsod/pinetime-hypnos/blob/master/app/hypnos/src/backlight.c]pinetime-hypnos/backlight.c at master · albsod/pinetime-hypnos · GitHub
pinetime/backlight.c at develop · ck-telecom/pinetime · GitHub
Use code which looks like this:
Code:
#if DT_NODE_HAS_STATUS(LED0_NODE, okay)
#define LED0 DT_GPIO_LABEL(LED0_NODE, gpios)
#define PIN DT_GPIO_PIN(LED0_NODE, gpios)
#define FLAGS DT_GPIO_FLAGS(LED0_NODE, gpios)
#endif
static void backlight_init(void)
{
const struct device *dev;
dev = device_get_binding(LED0);
/* If you have a backlight, set it up and turn it on here */
gpio_pin_configure(dev, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
gpio_pin_set(dev, PIN, 1);
}or this:
Code:
/* ********** ********** DEFINES ********** ********** ********** */
#define BACKLIGHT_PORT DT_GPIO_LABEL(DT_ALIAS(led1), gpios)
#define BACKLIGHT_1 DT_GPIO_PIN(DT_ALIAS(led0), gpios)
#define BACKLIGHT_2 DT_GPIO_PIN(DT_ALIAS(led1), gpios)
#define BACKLIGHT_3 DT_GPIO_PIN(DT_ALIAS(led2), gpios)
/* ********** ********** ********** ********** ********** */
/* ********** ********** VARIABLES AND STRUCTS ********** ********** */
static const struct device* backlight_dev;
static bool backlight_enabled = false;
/* ********** ********** ********** ********** ********** ********** */
/* ********** ********** FUNCTIONS ********** ********** */
void backlight_init()
{
backlight_dev = device_get_binding(BACKLIGHT_PORT);
gpio_pin_configure(backlight_dev, BACKLIGHT_1, GPIO_OUTPUT);
gpio_pin_configure(backlight_dev, BACKLIGHT_2, GPIO_OUTPUT);
gpio_pin_configure(backlight_dev, BACKLIGHT_3, GPIO_OUTPUT);
backlight_enable(true);
LOG_DBG("Backlight init: Done");
}I guess my questions is should I try to use the GPIO_DT_SPEC_GET_OR syntax or DT_GPIO_PIN, DT_GPIO_LABEL, and DT_GPIO_FLAGS.
I'm really new at this, as you can probably tell. I might be mixing things up. Trying to figure out the GPIO to turn on/off the backlight and it seems like this commonly/historically used device* structure and the gpio_dt_spec from the examples.