Audio Player Sederhana Untuk PCM 8 bit Menggunakan Mikrokontroler AVR

Pemrograman berikut menggunakan compiler WinAVR untuk mikrokontroler ATMega32 dengan nilai crystal 8 MHz. Pin output adalah PD5/OC1A yang dihubungkan dengan speaker. Untuk mendapatkan suara yang jelas maka output disambungkan dengan sebuah amplifier sederhana terlebih dahulu. Berikut konfigurasi dari sebuah jack audio.Sambungkan PD5/OC1A dengan Tx pada jack audio dan GND dengan GND pada mikrokontroler.

  1. Siapkan sebuah file audio. Jika berminat, berikut adalah link untuk membuat wav file yang dikonversi dari teks ke suara. http://www2.research.att.com/%7Ettsweb/tts/demo.php.
  2. Download software berikut untuk mengkonversi file audio ke format PCM Uncompressed 8000 Hz, 8 bits, mono  http://www.nch.com.au/switch/index.html. Setelah terinstall, buka software tersebut, klik Add File(s) lalu pilih file audio yang sudah disiapkan tadi. Pilih .wav pada Output Format. Kemudian klik Encoder options. Lalu akan muncul window Wave Encoder Options. Atur Format menjadi PCM Uncompressed dan Attributes menjadi 8000 Hz, 8 bits, Mono lalu klik OK. Setelah itu Convert.
  3. Konversi file .wav hasil konversi tadi ke dalam sebuah file .c dengan menggunakan software berikut. http://darkfader.net/ngpc/files/wav2c.zip. Pertama extract file .zip tersebut maka di dalamnya sudah terdapat file wav2c.exe. Cara mengkonversinya adalah dengan cara men-drag file .wav tadi lalu drop di file wav2c.exe tadi maka akan muncul file output berekstensi “.c”. Kemudian buka dengan notepad file tersebut maka akan muncul kumpulan angka-angka yang akan kita gunakan untuk sample PCM yang akan dimasukan pada mikrokontroler AVR.
  4. Copy angka-angka tadi ke header file pcm_sample.h dan save.
  5. Compile dengan menggunakan WinAVR. Berikut source code-nya.

main program:

/*
 ATmega32 @ 8MHz
 Plays an 8bit/8000 sample PCM audio on OC1A output
 */
 #include <stdint.h>
 #include <avr/io.h>
 #include <avr/pgmspace.h>
 #include "pcm_sample.h"
 #include <avr/interrupt.h>
 #define SAMPLE_RATE 8000;
 volatile uint16_t sample;
 int sample_count;
 /* initialise the PWM */
 void pwm_init(void)
 {
 /* use OC1A pin as output */
 DDRD = _BV(PD5);
 /*
 * clear OC1A on compare match
 * set OC1A at BOTTOM, non-inverting mode
 * Fast PWM, 8bit
 */
 TCCR1A = _BV(COM1A1) | _BV(WGM10);
 /*
 * Fast PWM, 8bit
 * Prescaler: clk/1 = 8MHz
 * PWM frequency = 8MHz / (255 + 1) = 31.25kHz
 */
 TCCR1B = _BV(WGM12) | _BV(CS10);
 /* set initial duty cycle to zero */
 OCR1A = 0;
 /* Setup Timer0 */
 TCCR0|=(1<<CS00);
 TCNT0=0;
 TIMSK|=(1<<TOIE0);
 sample_count = 4;
 sei(); //Enable interrupts
 }
 ISR(TIMER0_OVF_vect)
 {
 sample_count--;
 if (sample_count == 0)
 {
 sample_count = 4;
 OCR1A = pgm_read_byte(&pcm_samples[sample++]);
 if(sample>pcm_length)sample=0;
 }
 }
 int main(void)
 {
 pwm_init();
 while(1);//do nothing
 }

________________________________

Berikut contoh header file pcm_sample.h yang memutar suara “its working”.

// pcm samples created by wav2c
//It plays "its working"
const long pcm_length=6800;
const unsigned char pcm_samples[] PROGMEM ={
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};

Berikut contoh program dengan compiler AVR Studio 4.

http://www.mediafire.com/file/hi5rz16mhp3fre5/avr_wav.rar

SELAMAT MENCOBA!!

___________________________

Sumber :

http://avrpcm.blogspot.com/2010/11/playing-8-bit-pcm-using-any-avr.html

6 Responses to Audio Player Sederhana Untuk PCM 8 bit Menggunakan Mikrokontroler AVR

  1. bagus says:

    mas saya sudah coba tapi tidak berhasil.. gimana ya??

    • wangready says:

      mungkin konfigurasi hardware dan software nya dicek lg gan…setting di avr studionya dicek lg jenis mikro dan nilai crystal nya…trus biar suarannya jelas outputnya masukin k speaker yg ada amplinya…sya dlu pernah coba pake atmega32, outputnya dimasukin k ampli speaker komputer…klo nyobanya di software simulasi proteus itu gk bisa, gk tau kenapa, ane dlu nyoba & gagal, tp pas dicoba lngsung d hardware nyata, bisa…

      • wilman says:

        mas kalo mikro kita buat sebagai filter digital untuk suara bisa tidak ya?kalau bisa bagaimana caranya?terima kasih

      • wangready says:

        saya belum pernah nyoba. tp sya kira bisa saja. tp yg jadi masalahnya adalah spesifikasi mikrokontroler yg digunakan tentunya harus mempunyai sampling rate yang cukup tinggi dan mampu mengolah data dengan cepat. kalo pake mikro 8bit kyaknya program nya harus benar2 dioptimalkan. klo menurut saya mendingan pake ARM aja, biar lebih leluasa memprogramnya.tentunya nanti input suaranya akan masuk pin ADC mikro. untuk outputnya bisa pake mode PWM. kalo rumus filternya diubah jadi bentuk diskrit.

  2. Iki boleng says:

    Info nya donk, klo ke Arduino UNO gmn ? Bisa ngga gan? Klo bisa, minta info nya ya gan.. Hehehe thanxs

    • wangready says:

      keknya bisa gan, pake output analog atau PWM…. trus sambung ke speaker aktif yg pake amplifier, kalo speaker doang gk kuat, bunyinya gk kedengaran…

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