Revert nextFrame() back to the original version

A change made to nextFrame(), from the Arduboy library, caused it to not work
correctly. The original version works as designed.

Also:
- Changed longs to unsigned longs for better type matching.
- Removed the frameRate variable. It was being set but never used.
- Added a missing return value to the write() function.
- Changed a int8_t to uint8_t in function lcdCommandMode() to address a
  compiler warning.
- Rearranged the specification of the font[] array to address a compiler
  warning.

library.json

@@ -7,7 +7,7 @@
         "type": "git",
         "url": "https://github.com/MLXXXp/Arduboy2.git"
     },
-    "version": "2.0.2",
+    "version": "2.0.3",
     "exclude": "extras",
     "frameworks": "arduino",
     "platforms": "atmelavr"

library.properties

@@ -1,5 +1,5 @@
 name=Arduboy2
-version=2.0.2
+version=2.0.3
 author=Chris J. Martinez, Kevin Bates, Josh Goebel, Scott Allen, Ross O. Shoger
 maintainer=Scott Allen saydisp-git@yahoo.ca
 sentence=An alternative library for use with the Arduboy game system.

src/Arduboy2.cpp

@@ -112,7 +112,6 @@ void Arduboy2Base::bootLogo()
 
 void Arduboy2Base::setFrameRate(uint8_t rate)
 {
-  frameRate = rate;
   eachFrameMillis = 1000 / rate;
 }
 
@@ -123,7 +122,7 @@ bool Arduboy2Base::everyXFrames(uint8_t frames)
 
 bool Arduboy2Base::nextFrame()
 {
-  long now = millis();
+  unsigned long now = millis();
   uint8_t remaining;
 
   // post render
@@ -144,26 +143,8 @@ bool Arduboy2Base::nextFrame()
   }
 
   // pre-render
-
-  // next frame should start from last frame start + frame duration
-  nextFrameStart = lastFrameStart + eachFrameMillis;
-  // If we're running CPU at 100%+ (too slow to complete each loop within
-  // the frame duration) then it's possible that we get "behind"... Say we
-  // took 5ms too long, resulting in nextFrameStart being 5ms in the PAST.
-  // In that case we simply schedule the next frame to start immediately.
-  //
-  // If we were to let the nextFrameStart slide further and further into
-  // the past AND eventually the CPU usage dropped then frame management
-  // would try to "catch up" (by speeding up the game) to make up for all
-  // that lost time.  That would not be good.  We allow frames to take too
-  // long (what choice do we have?), but we do not allow super-fast frames
-  // to make up for slow frames in the past.
-  if (nextFrameStart < now) {
-    nextFrameStart = now;
-  }
-
+  nextFrameStart = now + eachFrameMillis;
   lastFrameStart = now;
-
   post_render = true;
   return post_render;
 }
@@ -783,6 +764,7 @@ size_t Arduboy2::write(uint8_t c)
       write('\n');
     }
   }
+  return 1;
 }
 
 void Arduboy2::drawChar

src/Arduboy2.h

@@ -222,11 +222,10 @@ protected:
   static uint8_t sBuffer[(HEIGHT*WIDTH)/8];
 
   // For frame funcions
-  uint8_t frameRate;
   uint16_t frameCount;
   uint8_t eachFrameMillis;
-  long lastFrameStart;
-  long nextFrameStart;
+  unsigned long lastFrameStart;
+  unsigned long nextFrameStart;
   bool post_render;
   uint8_t lastFrameDurationMs;
 };

src/ArduboyCore.cpp

@@ -169,7 +169,7 @@ void ArduboyCore::bootOLED()
   LCDCommandMode();
   // run our customized boot-up command sequence against the
   // OLED to initialize it properly for Arduboy
-  for (int8_t i=0; i < sizeof(lcdBootProgram); i++) {
+  for (uint8_t i = 0; i < sizeof(lcdBootProgram); i++) {
     SPI.transfer(pgm_read_byte(lcdBootProgram + i));
   }
   LCDDataMode();

src/glcdfont.c

@@ -5,7 +5,7 @@
 #define FONT5X7_H
 
 // standard ascii 5x7 font
-const static unsigned char  font[] PROGMEM =
+static const unsigned char font[] PROGMEM =
 {
     0x00, 0x00, 0x00, 0x00, 0x00,
     0x3E, 0x5B, 0x4F, 0x5B, 0x3E,