AN2577 datasheet(23/34 Pages) STMICROELECTRONICS

23 / 34 page

AN2577

eTPU software design

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First Period

StallTimer = StallPeriod at startpoint Time(activeEdge)

If ActiveEdge

Period = Time(ActiveEdge) - ToothTime

If timeout (StallTimer)

ToothTime = Time(ActiveEdge)

ToothCount += 1

TickRate = Period/TicksPerTooth

BlankTimer = Period * BlankingRatio

Testing_Possible_Gap

StallTimer = StallPeriod at startpoint Time(activeEdge)

If Period>GapRatio *

PeriodLast

PeriodLast = Period

If ActiveEdge

Period = Time(ActiveEdge) - ToothTime

If timeout (StallTimer)

ToothTime = Time(ActiveEdge)

ToothCount += 1

TickRate = Period/TicksPerTooth

BlankTimer = Period * BlankingRatio

Apparent_Gap

Period = PeriodLast

If ActiveEdge

TickRate = Period/TicksPerTooth

If timeout (StallTimer)

PossibleGapVerifying

StallTimer = StallPeriod at startpoint Time(activeEdge)

If Tooth_Period*Gap_

Ratio < PeriodLast

PeriodLast = Period

If Active Edge

Period = Time(ActiveEdge) - ToothTime

If timeout (StallTimer)

ToothTime = Time(ActiveEdge)

ToothCount += 1

TickRate = Period/TicksPerTooth

BlankTimer = Period * BlankingRatio

GapVerified

CrankStatus = HalfSync

If ActiveEdge

ToothCount = AngleSync/TicksPerTooth

If timeout (StallTimer)

Period = PeriodLast

TickRate = Period/TicksPerTooth

BlankTimer = Period * BlankingRatio

EngineAngle = AngleSync

Table 1.

Angle clock system state (continued)

Reference

name

Action

Exit

condition

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