The font is now fixed width.

HUGE performance improvement of the display driver.

src/DisplayApp/DisplayApp.cpp

@@ -4,6 +4,7 @@
 #include <libraries/log/nrf_log.h>
 #include <boards.h>
 #include <nrf_font.h>
+#include <hal/nrf_rtc.h>
 #include "Components/Gfx/Gfx.h"
 
 using namespace Pinetime::Applications;
@@ -21,6 +22,9 @@ void DisplayApp::Process(void *instance) {
 
   while (1) {
     NRF_LOG_INFO("BlinkApp task running!");
+
+    app->Refresh();
+
     vTaskDelay(1000);
   }
 }
@@ -48,17 +52,57 @@ void DisplayApp::InitHw() {
   gfx->ClearScreen();
 
   uint8_t x = 7;
-  gfx->DrawChar(&largeFont , '0', &x, 78, 0x0);
+  gfx->DrawChar(&largeFont , '0', &x, 78, 0xffff);
 
   x = 61;
-  gfx->DrawChar(&largeFont, '1', &x, 78, 0x0);
+  gfx->DrawChar(&largeFont, '0', &x, 78, 0xffff);
 
-  x = 115;
-  gfx->DrawChar(&largeFont, ':', &x, 78, 0x0);
+  x = 94;
+  gfx->DrawChar(&largeFont, ':', &x, 78, 0xffff);
 
   x = 127;
-  gfx->DrawChar(&largeFont, '2', &x, 78, 0x0);
+  gfx->DrawChar(&largeFont, '0', &x, 78, 0xffff);
 
   x = 181;
-  gfx->DrawChar(&largeFont, '3', &x, 78, 0x0);
+  gfx->DrawChar(&largeFont, '0', &x, 78, 0xffff);
+}
+
+void DisplayApp::Refresh() {
+  uint32_t systick_counter = nrf_rtc_counter_get(portNRF_RTC_REG);
+  auto raw = systick_counter / 1000;
+
+  // TODO make this better!
+  minutes = raw / 60;
+  seconds = raw - (minutes*60);
+
+  char secondChar[3];
+  sprintf(secondChar, "%02d", seconds);
+
+  char minutesChar[3];
+  sprintf(minutesChar, "%02d", minutes);
+
+  uint8_t x = 7;
+  if(minutesChar[0] != currentChar[0]) {
+    gfx->DrawChar(&largeFont, minutesChar[0], &x, 78, 0xffff);
+    currentChar[0] = minutesChar[0];
+  }
+
+  x = 61;
+  if(minutesChar[1] != currentChar[1]) {
+    gfx->DrawChar(&largeFont, minutesChar[1], &x, 78, 0xffff);
+    currentChar[1] = minutesChar[1];
+  }
+
+  x = 127;
+  if(secondChar[0] != currentChar[2]) {
+    gfx->DrawChar(&largeFont, secondChar[0], &x, 78, 0xffff);
+    currentChar[2] = secondChar[0];
+  }
+
+  x = 181;
+  if(secondChar[1] != currentChar[3]) {
+    gfx->DrawChar(&largeFont, secondChar[1], &x, 78, 0xffff);
+    currentChar[3] = secondChar[1];
+  }
+
 }

src/DisplayApp/DisplayApp.h

@@ -22,6 +22,12 @@ namespace Pinetime {
         std::unique_ptr<Drivers::St7789> lcd;
         std::unique_ptr<Components::Gfx> gfx;
         const FONT_INFO largeFont {lCD_70ptFontInfo.height, lCD_70ptFontInfo.startChar, lCD_70ptFontInfo.endChar, lCD_70ptFontInfo.spacePixels, lCD_70ptFontInfo.charInfo, lCD_70ptFontInfo.data};
+        void Refresh();
+
+        uint8_t seconds = 0;
+        uint8_t minutes = 0;
+        uint8_t hours = 0;
+        char currentChar[4];
     };
   }
 }