Add OLED and button diagnostics

src/local_ui_hw_test.h

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-3.0-only */
+/* Phase 7A local display and button electrical diagnostics. */
+
+#pragma once
+
+#include "esp_err.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Configure the shared I2C bus and active-low button inputs without probing. */
+esp_err_t local_ui_hw_test_init(void);
+
+/* Handle argv beginning with either "display" or "buttons". */
+int local_ui_hw_test_execute(int argc, char **argv);
+
+/* Append the Phase 7A command forms to the existing debug-group usage. */
+void local_ui_hw_test_print_usage(void);
+
+#ifdef __cplusplus
+}
+#endif