setBrightness safe handling + return

src/demo/NodeTest.h

@@ -19,8 +19,7 @@ public:
 
   void setup() override {
     config.read();
-    display.setup();
-    display.setBrightness(6);
+    display.setup(10);
     display.clear();
     display.printf(1, 1, LEFT, Blue, "Test");
     display.drawLine(0, 7, 32, 0, 1, Red);

src/patrix/display/Display.h

@@ -58,9 +58,9 @@ public:
 
   // basic ----------------------------------------------------------------------------------------
 
-  void setup() {
+  void setup(const int brightness) {
     leds.begin();
-    leds.setBrightness(10);
+    setBrightness(brightness);
     clear();
   }
 
@@ -78,11 +78,13 @@ public:
     }
   }
 
-  void setBrightness(const uint8_t brightness) {
+  uint8_t setBrightness(int brightness) {
+    brightness = max(0, min(brightness, 255));
     if (leds.getBrightness() != brightness) {
       leds.setBrightness(brightness);
       dirty = true;
     }
+    return brightness;
   }
 
   uint8_t getBrightness() const {
@@ -176,8 +178,7 @@ public:
       } else if (align == CENTER) {
         x = x - w / 2;
       }
-    } else {
-    }
+    } else {}
   }
 
   void measure(const char *message, int& w, int& h) {