Phase 7: EC11 encoder, life counter views, WS2812B RMT + LEDC buzzer feedback, E2E UI state machine; document build/hardware notes

main/led_manager.h

@@ -0,0 +1,33 @@
+/*
+ * MTG RFID Companion - WS2812B Neopixel LED manager (RMT)
+ *
+ * Phase 7 Step 7.3: Single WS2812B driver on GPIO 27. LED holds the last
+ * transmitted color until it is overwritten.
+ */
+
+#pragma once
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Initialize RMT TX channel for the Neopixel.
+ */
+esp_err_t led_manager_init(void);
+
+/**
+ * @brief Set the LED color immediately (GRB order internally).
+ */
+esp_err_t led_manager_set_color(uint8_t r, uint8_t g, uint8_t b);
+
+/**
+ * @brief Turn the LED off.
+ */
+esp_err_t led_manager_off(void);
+
+#ifdef __cplusplus
+}
+#endif