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First 100% float free version - Requires further testing.

This commit is contained in:
Josh Stewart 2013-07-03 20:56:33 +10:00
parent 89aa44990a
commit 930b5ade61
1 changed files with 9 additions and 1 deletions
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10
utils.h
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@ -24,7 +24,15 @@ injOpen: Injector open time. The time the injector take to open in uS
*/ */
int PW(int REQ_FUEL, int VE, int MAP, int GammaE, int injOpen) int PW(int REQ_FUEL, int VE, int MAP, int GammaE, int injOpen)
{ {
return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(GammaE/100.0) + injOpen); //Standard float version of the calculation
//return (REQ_FUEL * (float)(VE/100.0) * (float)(MAP/100.0) * (float)(GammaE/100.0) + injOpen);
//100% float free version, does sacrifice a little bit of accuracy. Accuracy loss is in the order of 0.1ms (100uS)
int iVE = (VE << 7) / 100;
int iMAP = (MAP << 7) / 100;
int iGammaE = (GammaE << 7) / 100;
int pulsewidth = (REQ_FUEL * iVE * iMAP * iGammaE) >> 21;
return (pulsewidth + injOpen);
} }
/* Determine the Gamma Enrichment number. Forumla borrowed from MS2 manual... may be skipped/simplified for arduino! /* Determine the Gamma Enrichment number. Forumla borrowed from MS2 manual... may be skipped/simplified for arduino!