first commit

main/drivers/backlight/backlight.h

@@ -0,0 +1,22 @@
+#ifndef BACKLIGHT_H
+#define BACKLIGHT_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "esp_err.h"
+
+/*
+ * STC8H1K28 board controller (I2C 0x30) on the CrowPanel 7" Advance.
+ *
+ * It owns more than the backlight: its init sequence also drives the GT911
+ * reset line, so this must run before the touch controller will answer on
+ * the bus at all. Requires i2c_bus_init() first.
+ */
+esp_err_t backlight_init(void);
+
+/* 0 = off, 255 = full. The v1.3 wire protocol is inverted; that is handled
+ * internally so callers can use the intuitive direction. */
+esp_err_t backlight_set(uint8_t brightness);
+
+#endif