====== delay ======

''void delay (u32 interval)''
|interval : Number of milliseconds to pause  | 
 
Pauses execution for interval milliseconds. Please be aware that the accuracy of this function may vary and
should not be used in situations where precise timing is needed. 

<code c>
#include "moacon500.h"
void cmain(void)
{
 portInit(2,0); //Initialize ports 20~27 for output
 while(1) //Run forever
 {
   portOut(20,1); //Set port 20 High
   delay(100); //Wait for 100ms

   portOut(20,0); //Set port 20 Low
   delay(100); //Wait for 100ms
 }
}
</code>

To wait for times less than 1ms, or to achieve a higher precision, a "spin-wait" function can be used. The
CPU will spin in a loop for a specified number of iterations.

<code c>
void spinWait(volatile u32 countdown) // The `volatile` is important here.
{
  for (;countdown > 0; countdown--);  // Loop until countdown reaches 0
  { }
}
</code>

Each iteration will consume a very small amount of time, so this method can be used to simulate a very
short delay, or a delay with higher precision.



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