Lpc2000

While I have yet to implement this on the LPC ARMs the following
is an approach I have been using with success for years.

At system startup setup a timer counter to increment at a rate
that will cause it to rollover at a convenient period (1-15 mSec).
Also initialize a 32 bit variable 'sysTICs' to 0.

In the rollover interrupt routine, increment sysTICs.

For delays of the rollover interval use routines like:

uint32_t getSysTICs(void)

  return sysTICs;


uint32_t getElapsedTICs(uint32_t startTICs)

  return (sysTICs - startTICs);


void pause(uint32_t pauseTICs)

  uint32_t startTime = getSysTICs();

  while (getElapsedTICs(startTICs) < pauseTICs)
    /* do something else */ ;


For short delays, you can replace sysTICs with the current value
of the Timer Counter Register.

uint32_t delay(uint32_t delay)

  uint32_t start = TC;

  while ((TC - start) < delay)
    /* do almost nothing else */ ;


Hope this helps.

-Bill Knight
R O SoftWare