Implement platform_setBacklightLevel for linux

openrtx/src/ui/ui.c

@@ -385,6 +385,7 @@ layout_t _ui_calculateLayout()
 
 void ui_init()
 {
+    last_event_tick = getTick();
     redraw_needed = true;
     layout = _ui_calculateLayout();
     layout_ready = true;

platform/targets/linux/emulator/sdl_engine.c

@@ -32,6 +32,8 @@ SDL_Texture  *displayTexture;
 
 /* Custom SDL Event to request a screenshot */
 Uint32 SDL_Screenshot_Event;
+/* Custom SDL Event to change backlight */
+Uint32 SDL_Backlight_Event;
 
 /*
  *  Mutex protected variables
@@ -338,6 +340,11 @@ void sdl_task()
                 screenshot_display(filename);
                 free(ev.user.data1);
             }
+            else if (ev.type == SDL_Backlight_Event)
+            {
+                set_brightness(*((uint8_t*)ev.user.data1));
+                free(ev.user.data1);
+            }
         }
 
         // we update the window only if there is a something ready to render
@@ -353,7 +360,6 @@ void sdl_task()
             }
 
             chan_send(&fb_sync, pixels);
-            set_brightness(state.settings.brightness);
             chan_recv(&fb_sync, NULL);
 
             SDL_UnlockTexture(displayTexture);
@@ -376,8 +382,9 @@ void init_sdl()
         exit(1);
     }
 
-    // Register an SDL custom event type to handle screenshot requests
+    // Register SDL custom events to handle screenshot requests and backlight
-    SDL_Screenshot_Event = SDL_RegisterEvents(1);
+    SDL_Screenshot_Event = SDL_RegisterEvents(2);
+    SDL_Backlight_Event = SDL_Screenshot_Event+1;
 
     chan_init(&fb_sync);
 

platform/targets/linux/platform.c

@@ -22,6 +22,9 @@
 #include "emulator.h"
 #include <SDL2/SDL.h>
 
+/* Custom SDL Event to adjust backlight */
+extern Uint32 SDL_Backlight_Event;
+
 hwInfo_t hwInfo;
 
 void platform_init()
@@ -51,7 +54,14 @@ void platform_terminate()
 
 void platform_setBacklightLevel(uint8_t level)
 {
-    (void) level;
+    SDL_Event e;
+    SDL_zero(e);
+    e.type = SDL_Backlight_Event;
+    e.user.data1 = malloc(sizeof(uint8_t));
+    uint8_t *data = (uint8_t *)e.user.data1;
+    *data = level;
+
+    SDL_PushEvent(&e);
 }
 
 // Simulate a fully charged lithium battery