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wiki/fw/api/API-Display.md

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+All display operations based on [u8g2](https://github.com/olikraus/u8g2) library.
+
+API available as struct, contains u8g2 functions, instance and fonts:
+
+```C
+typedef struct {
+    ValueManager* display; /// ValueManager<u8g2_t*>
+    void (*u8g2_SetFont)(u8g2_t *u8g2, const uint8_t  *font);
+    void (*u8g2_SetDrawColor)(u8g2_t *u8g2, uint8_t color);
+    void (*u8g2_SetFontMode)(u8g2_t *u8g2, uint8_t is_transparent);
+    u8g2_uint_t (*u8g2_DrawStr)(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, const char *str);
+
+    Fonts fonts;
+} Display;
+
+typedef struct {
+    const uint8_t* u8g2_font_6x10_mf;
+} Fonts;
+```
+
+First of all you can open display API instance by calling `open_display`
+
+```C
+/// Get display instance and API
+inline Display* open_display(const char* name) {
+    return (Display*)furi_open(name);
+}
+```
+
+Default display name is `/dev/display`.
+
+For draw something to display you can get display instance pointer by calling `take_display`, do something and commit your changes by calling `commit_display`:
+
+```C
+/// return pointer in case off success, NULL otherwise
+inline u8g2_t* take_display(Display* api, uint32_t timeout) {
+    return (u8g2_t*)take_mutex(api->display->value, timeout);
+}
+
+inline void commit_display(Display* api, u8g2_t* display) {
+    commit_valuemanager(api->display, display);
+}
+```
+
+## Usage example
+
+```C
+void u8g2_example(void* p) {
+    Display* display_api = open_display("/dev/display");
+    if(display_api == NULL) return; // display not available, critical error
+
+    u8g2_t* display = take_display(display_api);
+    if(display != NULL) {
+        display_api->u8g2_SetFont(display, display_api->fonts.u8g2_font_6x10_mf);
+        display_api->u8g2_SetDrawColor(display, 1);
+        display_api->u8g2_SetFontMode(display, 1);
+        display_api->u8g2_DrawStr(display, 2, 12, "hello world!");
+    }
+    commit_display(display_api, display);
+}
+```