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2 mjames 1 
// this file defines various constants
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#if !defined __INC_PLX_H
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#define      __INC_PLX_H
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typedef enum {
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        PLX_Start = 0x80,
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    PLX_Stop  = 0x40,
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} PLX_Header;
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static const char * PLX_Obs_Names []= {
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  "AFR","EGT","FluidTemp","Vac","Boost","AIT","RPM","Speed","TPS",
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        "Load","FluidPressure","Timing","MAP","MAF","ShortFuel",
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        "LongFuel","NBO2", "Fuel","Volts","Knock","Duty","CHT"
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} ;
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enum PLX_Observations
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{
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  PLX_AFR =   0,      //Wideband Air/Fuel
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  PLX_EGT =   1,      //EGT
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  PLX_FluidTemp =2, //Fluid Temp
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  PLX_Vac =   3,      //Vac
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  PLX_Boost = 4,   //Boost
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  PLX_AIT =   5, //AIT
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  PLX_RPM =   6,
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  PLX_Speed = 7, //Speed
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  PLX_TPS =   8, //TPS
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  PLX_Load =  9 , //Engine Load
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  PLX_FluidPressure = 10, //Fluid Pressure
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  PLX_Timing = 11, //Engine timing
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  PLX_MAP =   12, //MAP
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  PLX_MAF =   13, //MAF
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  PLX_ShortFuel = 14, //Short term fuel trim
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  PLX_LongFuel =15, //Long term fuel trim
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  PLX_NBO2 =  16, //Narrowband O2 sensor@@@@@@@
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  PLX_Fuel =  17, //Fuel level
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  PLX_Volts = 18, //Volts
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  PLX_Knock = 19, //Knock
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  PLX_Duty  = 20, //Duty cycle
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  PLX_X_CHT = 21, // Extended observations for aircooled engine
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  PLX_MAX_OBS
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};
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enum PLX_AFR_Units
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{
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                        AFR_Lambda,
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                    AFR_Gasoline,
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                        AFR_Diesel,
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                        AFR_Methanol,
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                        AFR_Ethanol,
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                        AFR_LPG,
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                        AFR_CNG
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};
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enum PLX_TEMP_Units
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{
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         TEMP_Celsius,
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     TEMP_Fahrenheit
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};
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enum PLX_PRESSURE_Units
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{
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        PRESSURE_PSI_Fuel,
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        PRESSURE_KGCM2_Fuel,
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        PRESSURE_Bar_Fuel,
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        PRESSURE_PSI_Oil,
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        PRESSURE_KGCM2_Oil,
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        PRESSURE_Bar_Oil
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};
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enum PLX_MAP_Units
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{
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        PRESSURE_kPa,
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        PRESSURE_InHg
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};
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extern double ConveriMFDRaw2Data(int sensor, int units, int raw);
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#pragma pack(push,1)
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typedef struct
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{
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        char AddrH;
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        char AddrL;
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        char Instance;
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        char ReadingH;
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        char ReadingL;
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} PLX_SensorInfo;
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#pragma pack(pop)
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static inline int ConvPLX(char H, char L)
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{
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        return ((H & 0x3F)<<6) | (L & 0x3F);
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}
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#endif