Add button counter test on GPIO22 with SoftSPI touch and LVGL.

Each press increments on-screen count; touch Reset clears. Flashable firmware/cyd package.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/button.cpp

@@ -0,0 +1,55 @@
+#include "button.h"
+#include "pins.h"
+
+#include <Arduino.h>
+
+static uint32_t g_count = 0;
+static bool g_stable_down = false;
+static bool g_last_raw = false;
+static uint32_t g_last_change_ms = 0;
+static constexpr uint32_t DEBOUNCE_MS = 40;
+
+void button_init() {
+  pinMode(BTN_PIN, INPUT_PULLUP);
+  g_count = 0;
+  g_stable_down = false;
+  g_last_raw = (digitalRead(BTN_PIN) == LOW);
+  g_last_change_ms = millis();
+  Serial.printf("Button GPIO%d INPUT_PULLUP (press=LOW)\n", BTN_PIN);
+}
+
+bool button_poll_press() {
+  const bool raw_down = (digitalRead(BTN_PIN) == LOW);
+  const uint32_t now = millis();
+
+  if (raw_down != g_last_raw) {
+    g_last_raw = raw_down;
+    g_last_change_ms = now;
+  }
+
+  if ((now - g_last_change_ms) < DEBOUNCE_MS) {
+    return false;
+  }
+
+  if (raw_down == g_stable_down) {
+    return false;
+  }
+
+  g_stable_down = raw_down;
+  if (!g_stable_down) {
+    return false; // 只计按下边沿
+  }
+
+  g_count++;
+  Serial.printf("Button press count=%lu\n", (unsigned long)g_count);
+  return true;
+}
+
+uint32_t button_count() { return g_count; }
+
+void button_reset_count() {
+  g_count = 0;
+  Serial.println("Button count reset");
+}
+
+bool button_is_down() { return g_stable_down; }