Question

我使用此转换器wav2c将.wav文件转换为可以放入头文件中的C。我能够将转换后的音频放入h文件，但是我引用它的程序似乎无法正常工作。该代码编译并上传到Arduino，但没有声音播放。我使用代码here来实现转换后的音频。我使用的是8欧姆0.25w扬声器。我既不是程序员，也不是电子学专家，所以我做错了可能很愚蠢。任何帮助深表感谢！

头文件中的代码（减去音频值的几百行）

#ifndef _HEADERFILE_H    // Put these two lines at the top of your file.
#define _HEADERFILE_H    // (Use a suitable name, usually based on the file name.)


const int sounddata_length=10000;
//const int sounddata_sampleRate=8000;

const unsigned char sounddata_data[] PROGMEM = {
  15,1,49,0,150,0,138,0,219,255,133,0,176,0,15,1,210,254,16,1,197,255,65,0,9,0,227,0,127,254,87,0,175,1,61,254,132,1,135,255,21,1,72,0,104,1,172,0,122,0,213,1,65,255,188,1,100,1,215,0,210,255,59,2,17,0,193,0,200,2,207,255,203,0,65,1,17,1,169,255,121,2,112,0,193,255,65,255,252,255,232,0,101,255,88,2,4,0,26,255,

//Several hundred lines more of these numbers for the audio

105,108,101,45,49,46,48,46,50,52,41,0,105,100,51,32,42,0,0,0,73,68,51,3,
  0,0,0,0,0,31,84,88,88,88,0,0,0,21,0,0,0,83,111,102,116,119,97,114,101,0,76,97,118,102,53,50,46,57,51,46,48,0,};

#endif // _HEADERFILE_H    // Put this line at the end of your file.

这是我从Arduino Playground页面使用的代码，用于播放头文件中的音频

#include <stdint.h>
#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/pgmspace.h>

#define SAMPLE_RATE 8000
#include "Test.h"

int ledPin = 3;
int speakerPin = 11; // Can be either 3 or 11, two PWM outputs connected to Timer 2
volatile uint16_t sample;
byte lastSample;


void stopPlayback()
{
    // Disable playback per-sample interrupt.
    TIMSK1 &= ~_BV(OCIE1A);

    // Disable the per-sample timer completely.
    TCCR1B &= ~_BV(CS10);

    // Disable the PWM timer.
    TCCR2B &= ~_BV(CS10);

    digitalWrite(speakerPin, LOW);
}

// This is called at 8000 Hz to load the next sample.
ISR(TIMER1_COMPA_vect) {
    if (sample >= sounddata_length) {
        if (sample == sounddata_length + lastSample) {
            stopPlayback();
        }
        else {
            if(speakerPin==11){
                // Ramp down to zero to reduce the click at the end of playback.
                OCR2A = sounddata_length + lastSample - sample;
            } else {
                OCR2B = sounddata_length + lastSample - sample;                
            }
        }
    }
    else {
        if(speakerPin==11){
            OCR2A = pgm_read_byte(&sounddata_data[sample]);
        } else {
            OCR2B = pgm_read_byte(&sounddata_data[sample]);            
        }
    }

    ++sample;
}

void startPlayback()
{
    pinMode(speakerPin, OUTPUT);

    // Set up Timer 2 to do pulse width modulation on the speaker
    // pin.

    // Use internal clock (datasheet p.160)
    ASSR &= ~(_BV(EXCLK) | _BV(AS2));

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

    if(speakerPin==11){
        // Do non-inverting PWM on pin OC2A (p.155)
        // On the Arduino this is pin 11.
        TCCR2A = (TCCR2A | _BV(COM2A1)) & ~_BV(COM2A0);
        TCCR2A &= ~(_BV(COM2B1) | _BV(COM2B0));
        // No prescaler (p.158)
        TCCR2B = (TCCR2B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10);

        // Set initial pulse width to the first sample.
        OCR2A = pgm_read_byte(&sounddata_data[0]);
    } else {
        // Do non-inverting PWM on pin OC2B (p.155)
        // On the Arduino this is pin 3.
        TCCR2A = (TCCR2A | _BV(COM2B1)) & ~_BV(COM2B0);
        TCCR2A &= ~(_BV(COM2A1) | _BV(COM2A0));
        // No prescaler (p.158)
        TCCR2B = (TCCR2B & ~(_BV(CS12) | _BV(CS11))) | _BV(CS10);

        // Set initial pulse width to the first sample.
        OCR2B = pgm_read_byte(&sounddata_data[0]);
    }





    // Set up Timer 1 to send a sample every interrupt.

    cli();

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

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

    // Set the compare register (OCR1A).
    // OCR1A is a 16-bit register, so we have to do this with
    // interrupts disabled to be safe.
    OCR1A = F_CPU / SAMPLE_RATE;    // 16e6 / 8000 = 2000

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

    lastSample = pgm_read_byte(&sounddata_data[sounddata_length-1]);
    sample = 0;
    sei();
}


void setup()
{
    pinMode(ledPin, OUTPUT);
    digitalWrite(ledPin, HIGH);
    startPlayback();
}

void loop()
{
    while (true);
}

为什么此代码不通过arduino向我的扬声器播放转换后的wav2c头文件？

0 个答案: