Slice - Slice Manager, aka State Machine.

    1 // slice manager
    2 // execute slices of a pie
    3 
    4 // in this example, one 1 slice of my_large_task gets executed every loop
    5 
    6 // define some macros for use as a state machine
    7 #define mDefinePie unsigned int8
    8 #define mSliceManager(slice,n)  slice++; if (slice > n) { slice = 1; } switch (slice)
    9 #define mOrderSlice(sid,fn)     case sid: { fn; break; }
   10 #define mPieIni(slice)          slice = 0;
   11 
   12 
   13 
   14 // example code:
   15 
   16 mDefinePie myPie;
   17 
   18 
   19 void slice_ledOn(void) {
   20   mPwrLed_on();
   21 }
   22 
   23 void slice_ledOff(void) {
   24   mPwrLed_off();
   25 }
   26 
   27 
   28 void my_large_task(void)
   29 {
   30   // manage 2 slices of the pie
   31   mSliceManager(myPie,2)
   32     {
   33     // define the order of the slices, (constant, function)
   34     mOrderSlice(1,slice_ledOn());
   35     mOrderSlice(2,slice_ledOff());
   36     }
   37 
   38 }
   39 
   40 
   41 void main(void)
   42 {
   43   mPieIni(myPie);
   44 
   45   while(1)
   46     {
   47     my_large_task();
   48     }
   49 }