ADC interrupt routine
Introducing ADC interrupt routine tor atmel devices
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VitorBoss
parent
0a6be57aa6
commit
0a1cadc504
40
sensors.h
40
sensors.h
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@ -14,6 +14,15 @@
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volatile byte flexCounter = 0;
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#define ANALOG_ISR //Comment this line to disable the ADC interrupt routine
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#if defined(ANALOG_ISR)
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#if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
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int AnChannel[7];
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#else
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int AnChannel[15];
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#endif
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#endif
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/*
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* Simple low pass IIR filter macro for the analog inputs
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* This is effectively implementing the smooth filter from http://playground.arduino.cc/Main/Smooth
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@ -27,4 +36,35 @@ void flexPulse();
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unsigned int tempReading;
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#if defined(ANALOG_ISR)
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//Analog ISR interrupt routine
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ISR(ADC_vect)
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{
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byte nChannel;
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int result = ADCL | (ADCH << 8);
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ADCSRA = 0x6E; // ADC disabled by clearing bit 7(ADEN)
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nChannel = ADMUX & 0x07;
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#if defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
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if (nChannel==7) { ADMUX = 0x40; }
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#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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if(ADCSRB & 0x08) { nChannel+=8; } //8 to 15
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if(nChannel==15)
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{
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ADMUX = 0x40; //channel 0
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ADCSRB = 0x00; //clear MUX5 bit
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}
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else if (nChannel==7) //channel 7
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{
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ADMUX = 0x40;
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ADCSRB = 0x08; //Set MUX5 bit
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}
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#endif
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else { ADMUX++; }
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AnChannel[nChannel] = result;
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ADCSRA = 0xEE; // ADC Interrupt Flag enabled
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}
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#endif
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#endif // SENSORS_H
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33
sensors.ino
33
sensors.ino
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@ -7,9 +7,12 @@ A full copy of the license may be found in the projects root directory
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void instanteneousMAPReading()
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{
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//Instantaneous MAP readings
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#if defined(ANALOG_ISR)
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tempReading = AnChannel[pinMAP-A0];
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#else
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tempReading = analogRead(pinMAP);
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tempReading = analogRead(pinMAP);
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#endif
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//Error checking
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if(tempReading >= VALID_MAP_MAX || tempReading <= VALID_MAP_MIN) { mapErrorCount += 1; }
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else { currentStatus.mapADC = tempReading; mapErrorCount = 0; }
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@ -34,8 +37,12 @@ void readMAP()
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if( (MAPcurRev == startRevolutions) || (MAPcurRev == startRevolutions+1) ) //2 revolutions are looked at for 4 stroke. 2 stroke not currently catered for.
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{
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#if defined(ANALOG_ISR)
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tempReading = AnChannel[pinMAP-A0];
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#else
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tempReading = analogRead(pinMAP);
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tempReading = analogRead(pinMAP);
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#endif
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//Error check
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if(tempReading < VALID_MAP_MAX && tempReading > VALID_MAP_MIN)
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@ -62,8 +69,12 @@ void readMAP()
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if( (MAPcurRev == startRevolutions) || (MAPcurRev == startRevolutions+1) ) //2 revolutions are looked at for 4 stroke. 2 stroke not currently catered for.
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{
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#if defined(ANALOG_ISR)
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tempReading = AnChannel[pinMAP-A0];
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#else
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tempReading = analogRead(pinMAP);
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tempReading = analogRead(pinMAP);
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#endif
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//Error check
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if(tempReading < VALID_MAP_MAX && tempReading > VALID_MAP_MIN)
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{
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@ -87,8 +98,12 @@ void readTPS()
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{
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currentStatus.TPSlast = currentStatus.TPS;
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currentStatus.TPSlast_time = currentStatus.TPS_time;
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#if defined(ANALOG_ISR)
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byte tempTPS = fastMap1023toX(AnChannel[pinTPS-A0], 255); //Get the current raw TPS ADC value and map it into a byte
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#else
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analogRead(pinTPS);
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byte tempTPS = fastMap1023toX(analogRead(pinTPS), 255); //Get the current raw TPS ADC value and map it into a byte
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#endif
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currentStatus.tpsADC = ADC_FILTER(tempTPS, ADCFILTER_TPS, currentStatus.tpsADC);
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//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).
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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
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@ -100,24 +115,36 @@ void readTPS()
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void readCLT()
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{
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#if defined(ANALOG_ISR)
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tempReading = fastMap1023toX(AnChannel[pinCLT-A0], 511); //Get the current raw CLT value
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#else
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tempReading = analogRead(pinCLT);
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tempReading = fastMap1023toX(analogRead(pinCLT), 511); //Get the current raw CLT value
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#endif
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currentStatus.cltADC = ADC_FILTER(tempReading, ADCFILTER_CLT, currentStatus.cltADC);
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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
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}
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void readIAT()
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{
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#if defined(ANALOG_ISR)
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tempReading = fastMap1023toX(AnChannel[pinIAT-A0], 511); //Get the current raw IAT value
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#else
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tempReading = analogRead(pinIAT);
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tempReading = fastMap1023toX(analogRead(pinIAT), 511); //Get the current raw IAT value
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#endif
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currentStatus.iatADC = ADC_FILTER(tempReading, ADCFILTER_IAT, currentStatus.iatADC);
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currentStatus.IAT = iatCalibrationTable[currentStatus.iatADC] - CALIBRATION_TEMPERATURE_OFFSET;
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}
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void readO2()
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{
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#if defined(ANALOG_ISR)
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tempReading = fastMap1023toX(AnChannel[pinO2-A0], 511); //Get the current O2 value.
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#else
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tempReading = analogRead(pinO2);
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tempReading = fastMap1023toX(analogRead(pinO2), 511); //Get the current O2 value.
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#endif
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currentStatus.O2ADC = ADC_FILTER(tempReading, ADCFILTER_O2, currentStatus.O2ADC);
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currentStatus.O2 = o2CalibrationTable[currentStatus.O2ADC];
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}
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@ -130,8 +157,12 @@ void readO2()
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void readBat()
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{
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#if defined(ANALOG_ISR)
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tempReading = fastMap1023toX(AnChannel[pinBat-A0], 245); //Get the current raw Battery value. Permissible values are from 0v to 24.5v (245)
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#else
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tempReading = analogRead(pinBat);
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tempReading = fastMap1023toX(analogRead(pinBat), 245); //Get the current raw Battery value. Permissible values are from 0v to 24.5v (245)
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#endif
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currentStatus.battery10 = ADC_FILTER(tempReading, ADCFILTER_BAT, currentStatus.battery10);
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}
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@ -485,7 +485,15 @@ void setup()
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currentLoopTime = micros();
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega2561__) //AVR chips use the ISR for this
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega2561__) //AVR chips use the ISR for this
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#if defined(ANALOG_ISR) //ADC interrupt routine
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//This sets the ADC (Analog to Digitial Converter) to run at 250KHz, greatly reducing analog read times (MAP/TPS)
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//the code on ISR run each conversion every 25 ADC clock, conversion run about 100KHz effectively
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//making a 6250 conversions/s on 16 channels and 12500 on 8 channels devices.
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ADCSRB = 0x00; //ADC Auto Trigger Source is in Free Running mode
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ADMUX = 0x40; //Select AREF as reference, ADC Left Adjust Result, Starting at channel 0
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ADCSRA = 0xEE; // ADC Interrupt Flag enabled and prescaler selected to 250KHz
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#else
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//This sets the ADC (Analog to Digitial Converter) to run at 1Mhz, greatly reducing analog read times (MAP/TPS)
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//1Mhz is the fastest speed permitted by the CPU without affecting accuracy
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//Please see chapter 11 of 'Practical Arduino' (http://books.google.com.au/books?id=HsTxON1L6D4C&printsec=frontcover#v=onepage&q&f=false) for more details
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@ -496,6 +504,7 @@ void setup()
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cbi(ADCSRA,ADPS0);
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#endif
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#endif
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#endif
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mainLoopCount = 0;
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@ -1450,6 +1459,37 @@ void loop()
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//************************************************************************************************
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//Interrupts
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#if defined(ANALOG_H)
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//Analog ISR interrupt routine
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ISR(ADC_vect)
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{
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byte nChannel;
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int result = ADCL | (ADCH << 8);
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ADCSRA = 0x6E; // ADC Auto Trigger disabled by clearing bit 7(ADEN)
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nChannel = ADMUX & 0x07;
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#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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if(ADCSRB & 0x08) { nChannel+=8; } //8 to 15
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if(nChannel==15)
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{
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ADMUX = 0x40; //channel 0
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ADCSRB = 0x00; //clear MUX5 bit
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}
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else if (nChannel==7) //channel 7
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{
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ADMUX = 0x40;
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ADCSRB = 0x08; //Set MUX5 bit
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}
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#elif defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2561__)
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if (nChannel==7) { ADMUX = 0x40; }
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#endif
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else { ADMUX++; }
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AnChannel[nChannel] = result;
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ADCSRA = 0xEE; // ADC Interrupt Flag enabled
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}
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#endif
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//These functions simply trigger the injector/coil driver off or on.
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//NOTE: squirt status is changed as per http://www.msextra.com/doc/ms1extra/COM_RS232.htm#Acmd
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/*
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