Your Accel() function take at least 25.5 seconds to execute (255 times through the loop with a 100 millisecond delay each time). When it is done control will return to your loop() function.
Your Accel() function take at least 25.5 seconds to execute (255 times through the loop with a 100 millisecond delay each time). When it is done control will return to your loop() function.