wiring.c

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#include <Arduino.h>
 
static const int Ms = 1000;
 
// returns uptime in milliseconds. It is defined in terms
// of microseconds to handle all the hard stuff in one place.
unsigned long millis(void)
{
    return micros() / Ms;
}
 
// returns uptime in microseconds. Uses the CNT register and
// tracks rollover.
unsigned long micros(void)
{
 
// Time  = CNT / (CLKFREQ / Ms)
// cycles / (cycles / sec) 
}
 
void delay(unsigned long Time)
{
  // Guard against zero or negative wait times which locks the processor.
  Time = max(1, Time);
 
  waitcnt( (Time * (CLKFREQ / Ms)) + CNT );
}
 
void delayMicroseconds(uint16_t Time)
{
  // Guard against zero or negative wait times which locks the processor.
  Time = max(1, Time);
 
  waitcnt( microsecondsToClockCycles(Time) + CNT );
}