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speeduino
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Fix occasional RPM flutter

This commit is contained in:
Josh Stewart 2014-12-24 10:25:40 +11:00
parent 81cfec3e2d
commit 7d7bd02922
1 changed files with 3 additions and 2 deletions
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speeduino.ino
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@ -214,7 +214,8 @@ void loop()
//Calculate the RPM based on the uS between the last 2 times tooth One was seen. //Calculate the RPM based on the uS between the last 2 times tooth One was seen.
previousLoopTime = currentLoopTime; previousLoopTime = currentLoopTime;
currentLoopTime = micros(); currentLoopTime = micros();
if ((currentLoopTime - toothLastToothTime) < 500000L) //Check how long ago the last tooth was seen compared to now. If it was more than half a second ago then the engine is probably stopped long timeToLastTooth = (currentLoopTime - toothLastToothTime);
if ( (timeToLastTooth < 500000L) || (toothLastToothTime > currentLoopTime) ) //Check how long ago the last tooth was seen compared to now. If it was more than half a second ago then the engine is probably stopped. toothLastToothTime can be greater than currentLoopTime if a pulse occurs between getting the lastest time and doing the comparison
{ {
noInterrupts(); noInterrupts();
unsigned long revolutionTime = (toothOneTime - toothOneMinusOneTime); //The time in uS that one revolution would take at current speed (The time tooth 1 was last seen, minus the time it was seen prior to that) unsigned long revolutionTime = (toothOneTime - toothOneMinusOneTime); //The time in uS that one revolution would take at current speed (The time tooth 1 was last seen, minus the time it was seen prior to that)
@ -261,7 +262,7 @@ void loop()
if (currentStatus.hasSync && (currentStatus.RPM > 0)) if (currentStatus.hasSync && (currentStatus.RPM > 0))
{ {
//If it is, check is we're running or cranking //If it is, check is we're running or cranking
if(currentStatus.RPM > (int)(configPage2.crankRPM * 100)) //Crank RPM stored in byte as RPM / 100 if(currentStatus.RPM > ((unsigned int)configPage2.crankRPM * 100)) //Crank RPM stored in byte as RPM / 100
{ //Sets the engine running bit, clears the engine cranking bit { //Sets the engine running bit, clears the engine cranking bit
BIT_SET(currentStatus.engine, BIT_ENGINE_RUN); BIT_SET(currentStatus.engine, BIT_ENGINE_RUN);
BIT_CLEAR(currentStatus.engine, BIT_ENGINE_CRANK); BIT_CLEAR(currentStatus.engine, BIT_ENGINE_CRANK);