| /* |
| * Copyright (c) 2016 Open-RnD Sp. z o.o. |
| * Copyright (c) 2020 Nordic Semiconductor ASA |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/zephyr.h> |
| #include <zephyr/device.h> |
| #include <zephyr/drivers/gpio.h> |
| #include <zephyr/sys/util.h> |
| #include <zephyr/sys/printk.h> |
| #include <inttypes.h> |
| |
| #define SLEEP_TIME_MS 1 |
| |
| /* |
| * Get button configuration from the devicetree sw0 alias. This is mandatory. |
| */ |
| #define SW0_NODE DT_ALIAS(sw0) |
| #if !DT_NODE_HAS_STATUS(SW0_NODE, okay) |
| #error "Unsupported board: sw0 devicetree alias is not defined" |
| #endif |
| 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; |
| } |
| |
| gpio_init_callback(&button_cb_data, button_pressed, BIT(button.pin)); |
| gpio_add_callback(button.port, &button_cb_data); |
| printk("Set up button at %s pin %d\n", button.port->name, button.pin); |
| |
| if (led.port && !device_is_ready(led.port)) { |
| printk("Error %d: LED device %s is not ready; ignoring it\n", |
| ret, led.port->name); |
| led.port = NULL; |
| } |
| if (led.port) { |
| ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT); |
| if (ret != 0) { |
| printk("Error %d: failed to configure LED device %s pin %d\n", |
| ret, led.port->name, led.pin); |
| led.port = NULL; |
| } else { |
| printk("Set up LED at %s pin %d\n", led.port->name, led.pin); |
| } |
| } |
| |
| printk("Press the button\n"); |
| if (led.port) { |
| while (1) { |
| /* If we have an LED, match its state to the button's. */ |
| int val = gpio_pin_get_dt(&button); |
| |
| if (val >= 0) { |
| gpio_pin_set_dt(&led, val); |
| } |
| k_msleep(SLEEP_TIME_MS); |
| } |
| } |
| } |