first commit

main/drivers/i2c_bus.h

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+#ifndef I2C_BUS_H
+#define I2C_BUS_H
+
+#include "driver/i2c_master.h"
+#include "esp_err.h"
+
+/*
+ * Shared I2C bus. On the CrowPanel Advance both the STC8H1K28 board
+ * controller (0x30) and the GT911 touch controller (0x5D) live on it, so a
+ * single owner avoids two drivers trying to install the same port.
+ */
+esp_err_t i2c_bus_init(void);
+
+i2c_master_bus_handle_t i2c_bus_get(void);
+
+/* Logs every responding address. Diagnostics for bring-up. */
+void i2c_bus_scan(const char *tag);
+
+#endif