Merge pull request #79 from ramboerik/fix-stm32f4-too-long-first-pulse

Fix first pulse being too long as the pulse's interval wasn't loaded …

src/timer/stm32/TimerField.h

@@ -72,8 +72,7 @@ TimerField::TimerField(TeensyStep::TF_Handler *_handler) :
 void TimerField::stepTimerStart()
 {
   stepTimer.resume();
-  // force reload of all timer's registers here saves 1.2ms in startup time
-  // https://github.com/stm32duino/wiki/wiki/HardwareTimer-library
+  // Force update on the step timer registers as it might be slow(>50ms sometimes) to start otherwise.
   stepTimer.refresh();
   stepTimerRunning = true;
 }
@@ -109,6 +108,9 @@ void TimerField::setStepFrequency(unsigned f)
 
 bool TimerField::begin()
 {
+  stepTimer.setPreloadEnable(false);
+  accTimer.setPreloadEnable(false);
+  pulseTimer.setPreloadEnable(false);
   return true;
 }