WTime.h

/*
|| @author         Brett Hagman <bhagman@wiring.org.co>
|| @url            http://wiring.org.co/
|| @contribution   Hernando Barragan <b@wiring.org.co>
|| @contribution   Alexander Brevig <abrevig@wiring.org.co>
||
|| @description
|| | Time methods.
|| |
|| | Wiring Framework
|| | Common
|| | Global Methods
|| #
||
|| @example
|| | void setup()
|| | {
|| |   pinMode(WLED, OUTPUT);
|| | }
|| | 
|| | void loop()
|| | {
|| |   static boolean ledstate = LOW;
|| |   
|| |   every(1000)
|| |   {
|| |     digitalWrite(WLED, ledstate);
|| |     ledstate = !ledstate;
|| |   }
|| | }
|| | 
|| #
||
|| @license Please see cores/Common/License.txt.
||
|| @name Time Methods
|| @type Core Framework Header
|| @target Common (Target Independent)
*/

#ifndef WTIME_H
#define WTIME_H


// returns difference
//#define millisDiff(VAR) (millis() - VAR)

static inline uint32_t since(uint32_t lastTime)
{
  return millis() - lastTime;
}


static inline bool hasPassed(uint32_t lastTime, const uint32_t expiryTime)
{
  return ((millis() - lastTime) >= expiryTime);
}

//static inline void startAgain(uint32_t &lastTime)
//{
//  lastTime = millis();
//  return true;
//}

#define PPMASH(x,y) x ## y
#define PPCONCAT(x,y) PPMASH(x,y)

#define every(N) \
static uint32_t PPCONCAT(lastTime,__LINE__);\
for (; hasPassed(PPCONCAT(lastTime,__LINE__), N) && (PPCONCAT(lastTime,__LINE__) = millis(), true);)

#define forMillis(N) \
for (uint32_t start = millis(); millis() - start < N;)

#endif