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Merge remote-tracking branch 'refs/remotes/origin/master' into noisymime/master

This commit is contained in:
VitorBoss 2016-10-24 16:32:37 -02:00
parent a0db44f9ae dabbf872c2
commit 3c43bd6fca
8 changed files with 265 additions and 60 deletions
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5
auxiliaries.ino
View File

@ -35,8 +35,9 @@ void initialiseAuxPWM()
vvt_pin_port = portOutputRegister(digitalPinToPort(pinVVT_1));
vvt_pin_mask = digitalPinToBitMask(pinVVT_1);
boost_pwm_max_count = 1000000L / (16 * configPage3.boostFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. The x2 is there because the frequency is stored at half value (in a byte) to allow freqneucies up to 511Hz
vvt_pwm_max_count = 1000000L / (16 * configPage3.vvtFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle
//(16 * configPage3.boostFreq * 2) = (configPage3.boostFreq * 16 * 2) = (configPage3.boostFreq * 32) = (configPage3.boostFreq << 5)
boost_pwm_max_count = 1000000L / (configPage3.boostFreq << 5); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. The x2 is there because the frequency is stored at half value (in a byte) to allow freqneucies up to 511Hz
vvt_pwm_max_count = 1000000L / (configPage3.vvtFreq << 5); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle
//TIMSK1 |= (1 << OCIE1A); //Turn on the A compare unit (ie turn on the interrupt) //Shouldn't be needed with closed loop as its turned on below
TIMSK1 |= (1 << OCIE1B); //Turn on the B compare unit (ie turn on the interrupt)

217
digitalWriteFast.h Normal file
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@ -0,0 +1,217 @@
/*
Optimized digital functions for AVR microcontrollers
by Watterott electronic (www.watterott.com)
based on http://code.google.com/p/digitalwritefast
*/
#ifndef __digitalWriteFast_h_
#define __digitalWriteFast_h_ 1
#define ERROR_SEQUENCE 0b10101010 //digitalReadFast will return this value if pin number is not constant
// general macros/defines
#ifndef BIT_READ
# define BIT_READ(value, bit) ((value) & (1UL << (bit)))
#endif
#ifndef BIT_SET
# define BIT_SET(value, bit) ((value) |= (1UL << (bit)))
#endif
#ifndef BIT_CLEAR
# define BIT_CLEAR(value, bit) ((value) &= ~(1UL << (bit)))
#endif
#ifndef BIT_WRITE
# define BIT_WRITE(value, bit, bitvalue) (bitvalue ? BIT_SET(value, bit) : BIT_CLEAR(value, bit))
#endif
#ifndef SWAP
#define SWAP(x,y) do{ (x)=(x)^(y); (y)=(x)^(y); (x)=(x)^(y); }while(0)
#endif
// workarounds for ARM microcontrollers
#if (!defined(__AVR__) || defined(ARDUINO_ARCH_SAM))
#ifndef PROGMEM
# define PROGMEM
#endif
#ifndef PGM_P
# define PGM_P const char *
#endif
#ifndef PSTR
# define PSTR(str) (str)
#endif
#ifndef memcpy_P
# define memcpy_P(dest, src, num) memcpy((dest), (src), (num))
#endif
#ifndef strcpy_P
# define strcpy_P(dst, src) strcpy((dst), (src))
#endif
#ifndef strcat_P
# define strcat_P(dst, src) strcat((dst), (src))
#endif
#ifndef strcmp_P
# define strcmp_P(a, b) strcmp((a), (b))
#endif
#ifndef strcasecmp_P
# define strcasecmp_P(a, b) strcasecmp((a), (b))
#endif
#ifndef strncmp_P
# define strncmp_P(a, b, n) strncmp((a), (b), (n))
#endif
#ifndef strncasecmp_P
# define strncasecmp_P(a, b, n) strncasecmp((a), (b), (n))
#endif
#ifndef strstr_P
# define strstr_P(a, b) strstr((a), (b))
#endif
#ifndef strlen_P
# define strlen_P(a) strlen((a))
#endif
#ifndef sprintf_P
# define sprintf_P(s, f, ...) sprintf((s), (f), __VA_ARGS__)
#endif
#ifndef pgm_read_byte
# define pgm_read_byte(addr) (*(const unsigned char *)(addr))
#endif
#ifndef pgm_read_word
# define pgm_read_word(addr) (*(const unsigned short *)(addr))
#endif
#ifndef pgm_read_dword
# define pgm_read_dword(addr) (*(const unsigned long *)(addr))
#endif
#endif
// digital functions
// --- Arduino Mega ---
#if (defined(ARDUINO_AVR_MEGA) || \
defined(ARDUINO_AVR_MEGA1280) || \
defined(ARDUINO_AVR_MEGA2560) || \
defined(__AVR_ATmega1280__) || \
defined(__AVR_ATmega1281__) || \
defined(__AVR_ATmega2560__) || \
defined(__AVR_ATmega2561__))
#define UART_RX_PIN (0) //PE0
#define UART_TX_PIN (1) //PE1
#define I2C_SDA_PIN (20)
#define I2C_SCL_PIN (21)
#define SPI_HW_SS_PIN (53) //PB0
#define SPI_HW_MOSI_PIN (51) //PB2
#define SPI_HW_MISO_PIN (50) //PB3
#define SPI_HW_SCK_PIN (52) //PB1
#define __digitalPinToPortReg(P) \
(((P) >= 22 && (P) <= 29) ? &PORTA : \
((((P) >= 10 && (P) <= 13) || ((P) >= 50 && (P) <= 53)) ? &PORTB : \
(((P) >= 30 && (P) <= 37) ? &PORTC : \
((((P) >= 18 && (P) <= 21) || (P) == 38) ? &PORTD : \
((((P) >= 0 && (P) <= 3) || (P) == 5) ? &PORTE : \
(((P) >= 54 && (P) <= 61) ? &PORTF : \
((((P) >= 39 && (P) <= 41) || (P) == 4) ? &PORTG : \
((((P) >= 6 && (P) <= 9) || (P) == 16 || (P) == 17) ? &PORTH : \
(((P) == 14 || (P) == 15) ? &PORTJ : \
(((P) >= 62 && (P) <= 69) ? &PORTK : &PORTL))))))))))
#define __digitalPinToDDRReg(P) \
(((P) >= 22 && (P) <= 29) ? &DDRA : \
((((P) >= 10 && (P) <= 13) || ((P) >= 50 && (P) <= 53)) ? &DDRB : \
(((P) >= 30 && (P) <= 37) ? &DDRC : \
((((P) >= 18 && (P) <= 21) || (P) == 38) ? &DDRD : \
((((P) >= 0 && (P) <= 3) || (P) == 5) ? &DDRE : \
(((P) >= 54 && (P) <= 61) ? &DDRF : \
((((P) >= 39 && (P) <= 41) || (P) == 4) ? &DDRG : \
((((P) >= 6 && (P) <= 9) || (P) == 16 || (P) == 17) ? &DDRH : \
(((P) == 14 || (P) == 15) ? &DDRJ : \
(((P) >= 62 && (P) <= 69) ? &DDRK : &DDRL))))))))))
#define __digitalPinToPINReg(P) \
(((P) >= 22 && (P) <= 29) ? &PINA : \
((((P) >= 10 && (P) <= 13) || ((P) >= 50 && (P) <= 53)) ? &PINB : \
(((P) >= 30 && (P) <= 37) ? &PINC : \
((((P) >= 18 && (P) <= 21) || (P) == 38) ? &PIND : \
((((P) >= 0 && (P) <= 3) || (P) == 5) ? &PINE : \
(((P) >= 54 && (P) <= 61) ? &PINF : \
((((P) >= 39 && (P) <= 41) || (P) == 4) ? &PING : \
((((P) >= 6 && (P) <= 9) || (P) == 16 || (P) == 17) ? &PINH : \
(((P) == 14 || (P) == 15) ? &PINJ : \
(((P) >= 62 && (P) <= 69) ? &PINK : &PINL))))))))))
#define __digitalPinToBit(P) \
(((P) >= 7 && (P) <= 9) ? (P) - 3 : \
(((P) >= 10 && (P) <= 13) ? (P) - 6 : \
(((P) >= 22 && (P) <= 29) ? (P) - 22 : \
(((P) >= 30 && (P) <= 37) ? 37 - (P) : \
(((P) >= 39 && (P) <= 41) ? 41 - (P) : \
(((P) >= 42 && (P) <= 49) ? 49 - (P) : \
(((P) >= 50 && (P) <= 53) ? 53 - (P) : \
(((P) >= 54 && (P) <= 61) ? (P) - 54 : \
(((P) >= 62 && (P) <= 69) ? (P) - 62 : \
(((P) == 0 || (P) == 15 || (P) == 17 || (P) == 21) ? 0 : \
(((P) == 1 || (P) == 14 || (P) == 16 || (P) == 20) ? 1 : \
(((P) == 19) ? 2 : \
(((P) == 5 || (P) == 6 || (P) == 18) ? 3 : \
(((P) == 2) ? 4 : \
(((P) == 3 || (P) == 4) ? 5 : 7)))))))))))))))
// --- Other ---
#else
#define SPI_HW_SS_PIN SS
#define SPI_HW_MOSI_PIN MOSI
#define SPI_HW_MISO_PIN MISO
#define SPI_HW_SCK_PIN SCK
#endif
//#endif //#ifndef digitalPinToPortReg
//ref: http://forum.arduino.cc/index.php?topic=140409.msg1054868#msg1054868
//void OutputsErrorIfCalled( void ) __attribute__ (( error( "Line: "__line__ "Variable used for digitalWriteFast") ));
void NonConstantUsed( void ) __attribute__ (( error("") ));
#ifndef digitalWriteFast
#if (defined(__AVR__) || defined(ARDUINO_ARCH_AVR))
#define digitalWriteFast(P, V) \
if (__builtin_constant_p(P) && __builtin_constant_p(V)) { \
BIT_WRITE(*__digitalPinToPortReg(P), __digitalPinToBit(P), (V)); \
} else { \
NonConstantUsed(); \
}
#else
#define digitalWriteFast digitalWrite
#endif
#endif
#ifndef pinModeFast
#if (defined(__AVR__) || defined(ARDUINO_ARCH_AVR))
#define pinModeFast(P, V) \
if (__builtin_constant_p(P) && __builtin_constant_p(V)) { \
BIT_WRITE(*__digitalPinToDDRReg(P), __digitalPinToBit(P), (V)); \
} else { \
NonConstantUsed(); \
}
#else
#define pinModeFast pinMode
#endif
#endif
#ifndef digitalReadFast
#if (defined(__AVR__) || defined(ARDUINO_ARCH_AVR))
#define digitalReadFast(P) ( (byte) __digitalReadFast((P)) )
#define __digitalReadFast(P ) \
(__builtin_constant_p(P) ) ? ( \
( BIT_READ(*__digitalPinToPINReg(P), __digitalPinToBit(P))) ) : \
ERROR_SEQUENCE
#else
#define digitalReadFast digitalRead
#endif
#endif
#endif //__digitalWriteFast_h_

4
globals.h
View File

@ -147,7 +147,7 @@ struct statuses {
unsigned int PW; //In uS
volatile byte runSecs; //Counter of seconds since cranking commenced (overflows at 255 obviously)
volatile byte secl; //Continous
volatile unsigned int loopsPerSecond;
volatile int loopsPerSecond;
boolean launchingSoft; //True when in launch control soft limit mode
boolean launchingHard; //True when in launch control hard limit mode
int freeRAM;
@ -421,7 +421,7 @@ byte pinIAT; //IAT sensor pin
byte pinCLT; //CLS sensor pin
byte pinO2; //O2 Sensor pin
byte pinO2_2; //second O2 pin
byte pinBat; //O2 Sensor pin
byte pinBat; //Battery voltage pin
byte pinDisplayReset; // OLED reset pin
byte pinTachOut; //Tacho output
byte pinFuelPump; //Fuel pump on/off

5
idle.ino
View File

@ -52,7 +52,8 @@ void initialiseIdle()
idle_pin_mask = digitalPinToBitMask(pinIdle1);
idle2_pin_port = portOutputRegister(digitalPinToPort(pinIdle2));
idle2_pin_mask = digitalPinToBitMask(pinIdle2);
idle_pwm_max_count = 1000000L / (16 * configPage3.idleFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. Note that the frequency is divided by 2 coming from TS to allow for up to 512hz
//(16 * configPage3.idleFreq * 2) = (configPage3.idleFreq * 16 * 2) = (configPage3.idleFreq * 32) = (configPage3.idleFreq << 5)
idle_pwm_max_count = 1000000L / (configPage3.idleFreq << 5); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. Note that the frequency is divided by 2 coming from TS to allow for up to 512hz
enableIdle();
break;
@ -72,7 +73,7 @@ void initialiseIdle()
idle_pin_mask = digitalPinToBitMask(pinIdle1);
idle2_pin_port = portOutputRegister(digitalPinToPort(pinIdle2));
idle2_pin_mask = digitalPinToBitMask(pinIdle2);
idle_pwm_max_count = 1000000L / (16 * configPage3.idleFreq * 2); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. Note that the frequency is divided by 2 coming from TS to allow for up to 512hz
idle_pwm_max_count = 1000000L / (configPage3.idleFreq << 5); //Converts the frequency in Hz to the number of ticks (at 16uS) it takes to complete 1 cycle. Note that the frequency is divided by 2 coming from TS to allow for up to 512hz
idlePID.SetOutputLimits(0, idle_pwm_max_count);
idlePID.SetTunings(configPage3.idleKP, configPage3.idleKI, configPage3.idleKD);
idlePID.SetMode(AUTOMATIC); //Turn PID on

4
math.h
View File

@ -10,7 +10,9 @@ int fastMap(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//This is a dedicated function that specifically handles the case of mapping 0-1023 values into a 0 to X range
//This is a common case because it means converting from a standard 10-bit analog input to a byte or 10-bit analog into 0-511 (Eg the temperature readings)
int fastMap1023toX(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//int fastMap1023toX(unsigned long x, int in_min, int in_max, int out_min, int out_max)
//removed ununsed variables, in_min and out_min is aways 0, in_max is aways 1023
int fastMap1023toX(unsigned long x, int out_max)
{
return (x * out_max) >> 10;
}

18
sensors.ino
View File

@ -4,7 +4,7 @@ Copyright (C) Josh Stewart
A full copy of the license may be found in the projects root directory
*/
unsigned int tempReading;
int tempReading;
void instanteneousMAPReading()
{
@ -16,7 +16,7 @@ void instanteneousMAPReading()
if(tempReading >= VALID_MAP_MAX || tempReading <= VALID_MAP_MIN) { mapErrorCount += 1; }
else { currentStatus.mapADC = tempReading; mapErrorCount = 0; }
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, 0, 1023, configPage1.mapMin, configPage1.mapMax); //Get the current MAP value
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, configPage1.mapMax); //Get the current MAP value
}
void readMAP()
@ -51,7 +51,7 @@ void readMAP()
{
//Reaching here means that the last cylce has completed and the MAP value should be calculated
currentStatus.mapADC = ldiv(MAPrunningValue, MAPcount).quot;
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, 0, 1023, configPage1.mapMin, configPage1.mapMax); //Get the current MAP value
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, configPage1.mapMax); //Get the current MAP value
MAPcurRev = startRevolutions; //Reset the current rev count
MAPrunningValue = 0;
MAPcount = 0;
@ -77,7 +77,7 @@ void readMAP()
{
//Reaching here means that the last cylce has completed and the MAP value should be calculated
currentStatus.mapADC = MAPrunningValue;
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, 0, 1023, configPage1.mapMin, configPage1.mapMax); //Get the current MAP value
currentStatus.MAP = fastMap1023toX(currentStatus.mapADC, configPage1.mapMax); //Get the current MAP value
MAPcurRev = startRevolutions; //Reset the current rev count
MAPrunningValue = 1023; //Reset the latest value so the next reading will always be lower
}
@ -90,7 +90,7 @@ void readTPS()
currentStatus.TPSlast = currentStatus.TPS;
currentStatus.TPSlast_time = currentStatus.TPS_time;
analogRead(pinTPS);
byte tempTPS = fastMap1023toX(analogRead(pinTPS), 0, 1023, 0, 255); //Get the current raw TPS ADC value and map it into a byte
byte tempTPS = fastMap1023toX(analogRead(pinTPS), 255); //Get the current raw TPS ADC value and map it into a byte
currentStatus.tpsADC = ADC_FILTER(tempTPS, ADCFILTER_TPS, currentStatus.tpsADC);
//Check that the ADC values fall within the min and max ranges (Should always be the case, but noise can cause these to fluctuate outside the defined range).
byte tempADC = currentStatus.tpsADC; //The tempADC value is used in order to allow TunerStudio to recover and redo the TPS calibration if this somehow gets corrupted
@ -103,7 +103,7 @@ void readTPS()
void readCLT()
{
tempReading = analogRead(pinCLT);
tempReading = fastMap1023toX(analogRead(pinCLT), 0, 1023, 0, 511); //Get the current raw CLT value
tempReading = fastMap1023toX(analogRead(pinCLT), 511); //Get the current raw CLT value
currentStatus.cltADC = ADC_FILTER(tempReading, ADCFILTER_CLT, currentStatus.cltADC);
currentStatus.coolant = cltCalibrationTable[currentStatus.cltADC] - CALIBRATION_TEMPERATURE_OFFSET; //Temperature calibration values are stored as positive bytes. We subtract 40 from them to allow for negative temperatures
}
@ -111,7 +111,7 @@ void readCLT()
void readIAT()
{
tempReading = analogRead(pinIAT);
tempReading = fastMap1023toX(analogRead(pinIAT), 0, 1023, 0, 511); //Get the current raw IAT value
tempReading = fastMap1023toX(analogRead(pinIAT), 511); //Get the current raw IAT value
currentStatus.iatADC = ADC_FILTER(tempReading, ADCFILTER_IAT, currentStatus.iatADC);
currentStatus.IAT = iatCalibrationTable[currentStatus.iatADC] - CALIBRATION_TEMPERATURE_OFFSET;
}
@ -119,7 +119,7 @@ void readIAT()
void readO2()
{
tempReading = analogRead(pinO2);
tempReading = fastMap1023toX(analogRead(pinO2), 0, 1023, 0, 511); //Get the current O2 value.
tempReading = fastMap1023toX(analogRead(pinO2), 511); //Get the current O2 value.
currentStatus.O2ADC = ADC_FILTER(tempReading, ADCFILTER_O2, currentStatus.O2ADC);
currentStatus.O2 = o2CalibrationTable[currentStatus.O2ADC];
}
@ -133,7 +133,7 @@ void readO2()
void readBat()
{
tempReading = analogRead(pinBat);
tempReading = fastMap1023toX(analogRead(pinBat), 0, 1023, 0, 245); //Get the current raw Battery value. Permissible values are from 0v to 24.5v (245)
tempReading = fastMap1023toX(analogRead(pinBat), 245); //Get the current raw Battery value. Permissible values are from 0v to 24.5v (245)
currentStatus.battery10 = ADC_FILTER(tempReading, ADCFILTER_BAT, currentStatus.battery10);
}

32
speeduino.ino
View File

@ -96,6 +96,7 @@ unsigned long previousLoopTime; //The time the previous loop started (uS)
unsigned long MAPrunningValue; //Used for tracking either the total of all MAP readings in this cycle (Event average) or the lowest value detected in this cycle (event minimum)
unsigned int MAPcount; //Number of samples taken in the current MAP cycle
byte MAPcurRev = 0; //Tracks which revolution we're sampling on
int LastBaro; //Used for ignore correction if powered on a ruuning engine
int CRANK_ANGLE_MAX = 720;
int CRANK_ANGLE_MAX_IGN = 360, CRANK_ANGLE_MAX_INJ = 360; // The number of crank degrees that the system track over. 360 for wasted / timed batch and 720 for sequential
@ -201,25 +202,33 @@ void setup()
//Need to check early on whether the coil charging is inverted. If this is not set straight away it can cause an unwanted spark at bootup
if(configPage2.IgInv == 1) { coilHIGH = LOW, coilLOW = HIGH; }
else { coilHIGH = HIGH, coilLOW = LOW; }
digitalWrite(pinCoil1, coilLOW);
digitalWrite(pinCoil2, coilLOW);
digitalWrite(pinCoil3, coilLOW);
digitalWrite(pinCoil4, coilLOW);
digitalWrite(pinCoil5, coilLOW);
endCoil1Charge();
endCoil2Charge();
endCoil3Charge();
endCoil4Charge();
endCoil5Charge();
//Similar for injectors, make sure they're turned off
digitalWrite(pinInjector1, LOW);
digitalWrite(pinInjector2, LOW);
digitalWrite(pinInjector3, LOW);
digitalWrite(pinInjector4, LOW);
digitalWrite(pinInjector5, LOW);
closeInjector1();
closeInjector2();
closeInjector3();
closeInjector4();
closeInjector5();
//Set the tacho output default state
digitalWrite(pinTachOut, HIGH);
//Lookup the current MAP reading for barometric pressure
readMAP();
currentStatus.baro = currentStatus.MAP;
/*
* The highest sea-level pressure on Earth occurs in Siberia, where the Siberian High often attains a sea-level pressure above 105 kPa;
* with record highs close to 108.5 kPa.
* The lowest measurable sea-level pressure is found at the centers of tropical cyclones and tornadoes, with a record low of 87 kPa;
*/
if ((currentStatus.MAP >= 87) && (currentStatus.MAP <= 108)) //Check if engine isn't running
LastBaro = currentStatus.baro = currentStatus.MAP;
else
currentStatus.baro = LastBaro; //last baro correction
//Perform all initialisations
initialiseSchedulers();
@ -1473,3 +1482,4 @@ void endCoil2and4Charge() { digitalWrite(pinCoil2, coilLOW); digitalWrite(pinCoi
void nullCallback() { return; }

40
table.ino
View File

@ -9,7 +9,6 @@ Because the size of the table is dynamic, this functino is required to reallocat
Note that this may clear some of the existing values of the table
*/
#include "table.h"
#include "globals.h"
void table2D_setSize(struct table2D* targetTable, byte newSize)
{
@ -213,8 +212,6 @@ int table2D_getValue(struct table2D *fromTable, int X)
}
//This function pulls a value from a 3D table given a target for X and Y coordinates.
//It performs a 2D linear interpolation as descibred in: http://www.megamanual.com/v22manual/ve_tuner.pdf
int get3DTableValue(struct table3D *fromTable, int Y, int X)
@ -358,50 +355,27 @@ int get3DTableValue(struct table3D *fromTable, int Y, int X)
int B = fromTable->values[yMin][xMax];
int C = fromTable->values[yMax][xMin];
int D = fromTable->values[yMax][xMax];
//Create some normalised position values
//These are essentially percentages (between 0 and 1) of where the desired value falls between the nearest bins on each axis
// Float version
/*
float p, q;
if (xMaxValue == xMinValue)
{ p = (float)(X-xMinValue); }
else { p = ((float)(X - xMinValue)) / (float)(xMaxValue - xMinValue); }
if (yMaxValue == yMinValue)
{ q = (float)(Y - yMinValue); }
else { q = 1- (((float)(Y - yMaxValue)) / (float)(yMinValue - yMaxValue)); }
float m = (1.0-p) * (1.0-q);
float n = p * (1-q);
float o = (1-p) * q;
float r = p * q;
return ( (A * m) + (B * n) + (C * o) + (D * r) );
*/
// Non-Float version:
//Initial check incase the values were hit straight on
long p;
if (xMaxValue == xMinValue)
{ p = ((long)(X - xMinValue) << 8); } //This only occurs if the requested X value was equal to one of the X axis bins
else
{
p = ((long)(X - xMinValue) << 8); //This only occurs if the requested X value was equal to one of the X axis bins
else
p = ((long)(X - xMinValue) << 8) / (xMaxValue - xMinValue); //This is the standard case
}
long q;
if (yMaxValue == yMinValue)
{ q = ((long)(Y - yMinValue) << 8); }
q = ((long)(Y - yMinValue) << 8);
else
{
q = 256 - (((long)(Y - yMaxValue) << 8) / (yMinValue - yMaxValue));
}
q = 256 - (((long)(Y - yMaxValue) << 8) / (yMinValue - yMaxValue));
int m = ((256-p) * (256-q)) >> 8;
int n = (p * (256-q)) >> 8;
int o = ((256-p) * q) >> 8;
int r = (p * q) >> 8;
return ( (A * m) + (B * n) + (C * o) + (D * r) ) >> 8;
}
}