Initial display support.

app/src/display.c

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2020 Peter Johanson
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <init.h>
+#include <device.h>
+#include <devicetree.h>
+
+#include <logging/log.h>
+LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
+
+#include <drivers/display.h>
+#include <lvgl.h>
+
+#define ZMK_DISPLAY_NAME CONFIG_LVGL_DISPLAY_DEV_NAME
+
+static struct device *display;
+
+static lv_obj_t *screen;
+
+int zmk_display_init()
+{
+    lv_obj_t *hello_world_label;
+    lv_obj_t *count_label;
+
+    LOG_DBG("");
+
+    display = device_get_binding(ZMK_DISPLAY_NAME);
+    if (display == NULL) {
+        LOG_ERR("Failed to find display device");
+        return -EINVAL;
+    }
+
+    screen = lv_obj_create(NULL, NULL);
+    lv_scr_load(screen);
+
+    hello_world_label = lv_label_create(lv_scr_act(), NULL);
+    lv_label_set_text(hello_world_label, "ZMK v0.1.0");
+    lv_obj_align(hello_world_label, NULL, LV_ALIGN_CENTER, 0, 0);
+    count_label = lv_label_create(lv_scr_act(), NULL);
+    lv_label_set_text(count_label, CONFIG_ZMK_KEYBOARD_NAME);
+    lv_obj_align(count_label, NULL, LV_ALIGN_IN_BOTTOM_MID, 0, 0);
+    lv_task_handler();
+    display_blanking_off(display);
+
+    return 0;
+}
+
+void zmk_display_task_handler()
+{
+    lv_tick_inc(10);
+    lv_task_handler();
+    k_sleep(K_MSEC(10));
+}

app/src/main.c

@@ -14,7 +14,7 @@ LOG_MODULE_REGISTER(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 #include <zmk/matrix.h>
 #include <zmk/kscan.h>
-#include <zmk/endpoints.h>
+#include <zmk/display.h>
 
 #define ZMK_KSCAN_DEV DT_LABEL(ZMK_MATRIX_NODE_ID)
 
@@ -26,4 +26,12 @@ void main(void)
 	{
 		return;
 	}
+
+#ifdef CONFIG_ZMK_DISPLAY
+	zmk_display_init();
+
+	while (1) {
+		zmk_display_task_handler();
+	}
+#endif /* CONFIG_ZMK_DISPLAY */
 }