feat(button): 添加按键模块及初始化按键去皮功能

inc/button.h

@@ -0,0 +1,7 @@
+#pragma once
+
+/**
+ * @brief 初始化按键模块：Button1 按下触发去皮 + LED1 闪烁反馈。
+ * @return 0 成功，负 errno 失败。
+ */
+int button_init(void);

src/button.c

@@ -0,0 +1,75 @@
+#include "button.h"
+#include "sensor.h"
+
+#include <zephyr/drivers/gpio.h>
+#include <zephyr/kernel.h>
+#include <zephyr/logging/log.h>
+
+LOG_MODULE_REGISTER(button, LOG_LEVEL_INF);
+
+/* DK Button1 = sw0, LED1 = led0 */
+static const struct gpio_dt_spec btn1 = GPIO_DT_SPEC_GET(DT_ALIAS(sw0), gpios);
+static const struct gpio_dt_spec led1 = GPIO_DT_SPEC_GET(DT_ALIAS(led0), gpios);
+
+static struct gpio_callback btn_cb_data;
+static struct k_work_delayable led_off_work;
+
+#define LED_FLASH_MS    200
+#define LED_BLINK_COUNT 3
+
+static struct k_work tare_work;
+static volatile int blink_remaining;
+
+static void led_off_handler(struct k_work *work) {
+    if (blink_remaining <= 0) return;
+
+    blink_remaining--;
+    /* 奇数次：点亮；偶数次：熄灭 */
+    gpio_pin_set_dt(&led1, blink_remaining & 1);
+    if (blink_remaining > 0) {
+        k_work_schedule(&led_off_work, K_MSEC(LED_FLASH_MS));
+    }
+}
+
+static void tare_work_handler(struct k_work *work) {
+    LOG_INF("Button1 pressed → tare");
+    sensor_perform_tare();
+
+    /* LED1 闪烁 3 次：亮-灭-亮-灭-亮-灭 = 6 个状态翻转 */
+    blink_remaining = LED_BLINK_COUNT * 2;
+    gpio_pin_set_dt(&led1, 1);
+    k_work_schedule(&led_off_work, K_MSEC(LED_FLASH_MS));
+}
+
+static void btn1_isr(const struct device *dev, struct gpio_callback *cb, uint32_t pins) {
+    k_work_submit(&tare_work);
+}
+
+int button_init(void) {
+    if (!gpio_is_ready_dt(&btn1) || !gpio_is_ready_dt(&led1)) {
+        LOG_ERR("GPIO device not ready");
+        return -ENODEV;
+    }
+
+    int err;
+
+    err = gpio_pin_configure_dt(&btn1, GPIO_INPUT);
+    if (err) return err;
+
+    err = gpio_pin_interrupt_configure_dt(&btn1, GPIO_INT_EDGE_TO_ACTIVE);
+    if (err) return err;
+
+    err = gpio_pin_configure_dt(&led1, GPIO_OUTPUT_INACTIVE);
+    if (err) return err;
+
+    gpio_init_callback(&btn_cb_data, btn1_isr, BIT(btn1.pin));
+
+    err = gpio_add_callback(btn1.port, &btn_cb_data);
+    if (err) return err;
+
+    k_work_init(&tare_work, tare_work_handler);
+    k_work_init_delayable(&led_off_work, led_off_handler);
+
+    LOG_INF("Button1 → tare + LED1 flash initialized");
+    return 0;
+}

src/main.c

@@ -8,6 +8,7 @@
  */
 
 #include "ble_transport.h"
+#include "button.h"
 #include "sensor.h"
 
 #include <zephyr/kernel.h>
@@ -22,7 +23,15 @@ int main(void) {
     ble_transport_init();
     ble_transport_adv_start();
 
-    if (sensor_init()) return 0;
+    if (button_init()) {
+        LOG_ERR("Failed to initialize buttons");
+        return -1;
+    }
+
+    if (sensor_init()) {
+        LOG_ERR("Failed to initialize sensor");
+        return -1;
+    }
 
     k_sleep(K_FOREVER);