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BlockSlice - Slice manager (aka state machine)

 
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mbradley



Joined: 11 Jul 2009
Posts: 118
Location: California, USA

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BlockSlice - Slice manager (aka state machine)
PostPosted: Sun Jun 14, 2015 3:21 pm     Reply with quote

Hello everyone,

I have posted in a little while, but I wanted to share a recent lib I created.

Its a way to have only a part of your function execute every time your function is called. The parts (slices) in your function will execute in order.

For me, I had some background math that needed to be done, that was rather long. I noticed I had a bunch of free time while doing output pulses, and input captures, so I decided I would execute parts of the code in these areas, and it started to look really ugly.

So now, when ever I know I have free cycles, I make a call to my function, and I know it won't hang up because only a portion of it runs at a time.


Here is the code, I hope you enjoy it.

--mike

blockslice.h
Code:

/*


Example usage:
#include "blockslice.h"


#define LED_GREEN    PIN_B5
#define LED_YELLOW   PIN_B4
#define LED_RED      PIN_B3

mDefineBlockSlice(2); // number of block slices to define

void procStatus(void)
{
   mBlockSliceStart(0); // this is used to track which state machine
   mBlockSlice() { output_high(LED_YELLOW); }
   mBlockSlice() { output_low(LED_YELLOW); }
   mBlockSliceEnd();
}

void procLights(void)
{
   mBlockSliceStart(1); // this is used to track which state machine
   mBlockSlice() { output_high(LED_GREEN); }
   mBlockSlice() { output_low(LED_GREEN); }
   mBlockSlice() { output_high(LED_RED); }
   mBlockSlice() { output_low(LED_RED); }
   mBlockSliceEnd();
}


void main()
{
   output_high(LED_GREEN);

   // initialize the state machines
   mBlockSliceIni(0);
   mBlockSliceIni(1);

   while(TRUE)
     {
     procStatus();
     procLights();
     delay_ms(500);
     }
 
}


*/



// yes, I know there is no ';' at the end of this line, its on purpose, see translate below
#define mDefineBlockSlice(cnt) unsigned int8 __bsActive = 0; unsigned int8 __bsNdx[cnt], __bsState[cnt]
/*
   mDefineBlockSlice(1);
   
   translates to:
   
   unsigned int8 __bsActive = 0; unsigned int8 __bsNdx[1], __bsState[1];
*/

#define mBlockSliceIni(ndx)   __bsState[ndx] = 0;

#define mBlockSliceStart(ndx) __bsActive = ndx; __bsNdx[ndx] = 255;
/*
   mBlockSliceStart(0);
   
   translates to:
   
   __bsActive = 0; __bsNdx[0] = 255;
*/


#define mBlockSlice()  __bsNdx[__bsActive]++; if ( __bsState[__bsActive] == __bsNdx[__bsActive] )
/*
   mBlockSlice()
     {
     output_high(LED_ERR);
     delay_ms(500);
     }
   
   translates to:
   
   __bsNdx[__bsActive]++; if ( __bsState[__bsActive] == __bsNdx[__bsActive]) )   
     {
     output_high(LED_ERR);
     delay_ms(500);
     }
*/


#define mBlockSliceEnd() __bsState[__bsActive]++; if ( __bsState[__bsActive] > __bsNdx[__bsActive] ) { __bsState[__bsActive] = 0; }
/*
   mBlockSliceEnd();
   
   translates to:
   
   __bsState[__bsActive]++; if ( __bsState[__bsActive] > __bsNdx[__bsActive] ) { __bsState[__bsActive] = 0; }
*/



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Michael Bradley
www.mculabs.com
Open Drivers and Projects
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