Sound simulation

Projects Programming
1

can you add a command when the currentthrottle (potval) closes spontaneously from 1023-0 or -1023 -0 or reverse

case 2: // running ----
     
      if ((currentThrottle >= 0) && (currentThrottle <= 1000)) {
      if (curIdleSample >= idle_length) { // Loop the sample
        curIdleSample = 0;
      }
      OCR1A = currentIdleRate; // variable sample rate (RPM)!
      OCR2B = pgm_read_byte(&idle_data[curIdleSample]);
      curIdleSample++;
      break;
      }
      else if ((currentThrottle >= 1000) && (currentThrottle <= 1023)) {
       if (curOnlimiterSample >= onlimiter_length) { // Loop the sample
        curOnlimiterSample = 0;
      }
      OCR1A = currentONlimiterRate; // variable sample rate (RPM)!
      OCR2B = pgm_read_byte(&onlimiter_data[curOnlimiterSample]);
      curOnlimiterSample++;
      break;
      }
   }
}
2

Need to see the entire code

3 
#include "settings.h"
#include "curves.h" // load nonlinear throttle curve arrays
#define SPEAKER1 3
#define SPEAKER2 11
                               // Amplifier PAM8403 connected to pin 3 (via 10kOhm potentiometer)
#define FREQ 32000000L                         // 16MHz clock frequency

// Define global variables
volatile uint32_t currentIdleRate = BASE_RATE;
volatile uint32_t currentONlimiterRate = ONLIMITER_RATE;
volatile uint32_t fixedSmpleRate = FREQ / BASE_RATE;
volatile uint16_t engineState = 1;
volatile uint32_t curIdleSample;
volatile uint32_t curOnlimiterSample;         
volatile uint32_t curStartSample;
bool SoundTransition = true;
uint16_t  currentThrottle = 0;                  // 0 - 500, a top value of 1023 is acceptable
const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
int sensorValue = 0;        // value read from the pot
void setup() {

  setupPcm();
}
void setupPcm() {

  pinMode(SPEAKER1, OUTPUT);
  pinMode(SPEAKER2, OUTPUT);
  pinMode(analogInPin,INPUT);
  // Set up Timer 2 to do pulse width modulation on the speaker pin.
  ASSR &= ~(_BV(EXCLK) | _BV(AS2));                         // Use internal clock (datasheet p.160)

  TCCR2A |= _BV(WGM21) | _BV(WGM20);                        // Set fast PWM mode  (p.157)
  TCCR2B &= ~_BV(WGM22);

  TCCR2A = (TCCR2A | _BV(COM2B1)) & ~_BV(COM2B0);           // Do non-inverting PWM on pin OC2B (p.155)
  TCCR2A = _BV(COM2A1) | _BV(COM2B1) | _BV(WGM21) | _BV(WGM20);
  TCCR2B = _BV(CS22);
  OCR2A = 180;
  OCR2B = 180;                   // On the Arduino this is pin 3.
  TCCR2B = (TCCR2B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10); // No prescaler (p.158)

  OCR2B = pgm_read_byte(&idle_data[curIdleSample]);                       // Set initial pulse width to the first sample.                       // Set initial pulse width to the first sample.
  OCR2B = pgm_read_byte(&onlimiter_data[curOnlimiterSample]);
  // Set up Timer 1 to send a sample every interrupt.
  cli();

  TCCR1B = (TCCR1B & ~_BV(WGM13)) | _BV(WGM12);             // Set CTC mode (Clear Timer on Compare Match) (p.133)
  TCCR1A = TCCR1A & ~(_BV(WGM11) | _BV(WGM10));             // Have to set OCR1A *after*, otherwise it gets reset to 0!

  TCCR1B = (TCCR1B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10); // No prescaler (p.134)

  OCR1A = FREQ / BASE_RATE;
                                  // Set the compare register (OCR1A).
  // OCR1A is a 16-bit register, so we have to do this with
  // interrupts disabled to be safe.

  TIMSK1 |= _BV(OCIE1A);                                   // Enable interrupt when TCNT1 == OCR1A (p.136)

  
  curIdleSample = 0;
  curOnlimiterSample = 0;
  curStartSample = 0;



  sei();
}

void engineMassSimulation() {

  static int32_t  mappedThrottle = 0;
  static int32_t currentRpm = 0;
  static unsigned long throtMillis;

  if (millis() - throtMillis > 5) { // Every 5ms
    throtMillis = millis();

    // compute unlinear throttle curve
    mappedThrottle = reMap(curveShifting, currentThrottle);

    // Accelerate engine
    if (mappedThrottle + acc > currentRpm && engineState == 2) {
      currentRpm += acc;
      if (currentRpm > maxRpm) currentRpm = maxRpm;
    }

    // Decelerate engine
    else if (mappedThrottle - dec < currentRpm) {
      currentRpm -= dec;
      if (currentRpm < minRpm) currentRpm = minRpm;
    }

    if ((currentThrottle >= 0) && (currentThrottle <= 1000)) {
    currentIdleRate = FREQ / (BASE_RATE + long(currentRpm * IDLE_MULTIPLIER) ); //1
    }   
    else if((currentThrottle >= 1000) && (currentThrottle <= 1023)) {
    currentONlimiterRate = FREQ / (ONLIMITER_RATE + long(currentRpm * LIMITER_MULTIPLIER) );//
    }
  }

}
void loop() {
  sensorValue = analogRead(analogInPin);
  // map it to the range of the analog out:
  currentThrottle = map(sensorValue, 200, 1023, 0, 1023);
  // Simulate engine mass, generate RPM signal
  engineMassSimulation();
}


// This is the main sound playback interrupt, keep this nice and tight!! ------------------------------
ISR(TIMER1_COMPA_vect) {

  static float attenuator;  // Float required for finer granularity!

  switch (engineState) {
  
      case 1:
      if (curStartSample >= start_length) { // Loop the sample
        curStartSample = 0;
        engineState = 2;
      }
      OCR1A = fixedSmpleRate; // fixed sample rate (speed)!
      OCR2B = pgm_read_byte(&start_data[curStartSample]);
      curStartSample++;
      break;      

     case 2: // running ----
     
      if ((currentThrottle >= 0) && (currentThrottle <= 1000)) {
      if (curIdleSample >= idle_length) { // Loop the sample
        curIdleSample = 0;
      }
      OCR1A = currentIdleRate; // variable sample rate (RPM)!
      OCR2B = pgm_read_byte(&idle_data[curIdleSample]);
      curIdleSample++;
      break;
      }
      else if ((currentThrottle >= 1000) && (currentThrottle <= 1023)) {
       if (curOnlimiterSample >= onlimiter_length) { // Loop the sample
        curOnlimiterSample = 0;
      }
      OCR1A = currentONlimiterRate; // variable sample rate (RPM)!
      OCR2B = pgm_read_byte(&onlimiter_data[curOnlimiterSample]);
      curOnlimiterSample++;
      break;
      }
   }
}
4

Thank you.
What do you want to do when it closes/opens spontaneously?

5

play other sounds, for example the sound of an engine braking

6

It's certainly possible to do what you want but off-hand, I'm not sure how to integrate that function into your existing code. For me me it would take some time to analyze the code.

7

@yuzeng_39 your topic was moved to its current location as it is more suitable.

Could you also take a few moments to Learn How To Use The Forum.

It will help you get the best out of the forum in the future.

Thank you

8

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