This is a demo that uses the System Tick counter in the STM32F4

as a way of creating accurately timed delays. A simple 'msleep'
is implemented by watching the system clock to wait a certain
number of milleseconds before it returns. Its a bit more accurate
than a for loop, although it really shines when your running multiple
threads.

examples/stm32/f4/stm32f4-discovery/tick_blink/README

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+README
+------
+
+This example is the same as fancy_blink except that it uses the
+systick timer to generate time accurate delays. Shows how to set
+up the systick timer to create an interrupt every millisecond and
+how to write a delay routine (msleep) that can then delay for a
+specific number of milliseconds.