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8位機也玩音頻-Arduino+SD+DAC+運放打造的播放器

8位機   Arduino   SD   DAC   
  • 作者：zhanzr
  • 來源：21ic
  • [導(dǎo)讀]
  • 比如本文要介紹的Adafruit Wave Shield,就能是專門為Arduino設(shè)計的音頻模塊.確切的說是為AVR這一類的8位機而設(shè)計的音頻模塊.下文將從硬件到軟件詳細介紹一下子此模塊的設(shè)計細節(jié)與使用方法.

PgmPrint(", ");

Serial.println(card.errorData(), HEX);

while(1);

}

/*

* play recursively - possible stack overflow if subdirectories too nested

*/

void play(FatReader &dir) {

FatReader file;

while (dir.readDir(dirBuf) > 0) { // Read every file in the directory one at a time

// Skip it if not a subdirectory and not a .WAV file

if (!DIR_IS_SUBDIR(dirBuf)

&& strncmp_P((char *)&dirBuf.name[8], PSTR("WAV"), 3)) {

continue;

}

Serial.println(); // clear out a new line

for (uint8_t i = 0; i < dirLevel; i++) {

Serial.write(' '); // this is for prettyprinting, put spaces in front

}

if (!file.open(vol, dirBuf)) { // open the file in the directory

error("file.open failed"); // something went wrong

}

if (file.isDir()) { // check if we opened a new directory

putstring("Subdir: ");

printEntryName(dirBuf);

Serial.println();

dirLevel += 2; // add more spaces

// play files in subdirectory

play(file); // recursive!

dirLevel -= 2;

}

else {

// Aha! we found a file that isnt a directory

putstring("Playing ");

printEntryName(dirBuf); // print it out

if (!wave.create(file)) { // Figure out, is it a WAV proper?

putstring(" Not a valid WAV"); // ok skip it

} else {

Serial.println(); // Hooray it IS a WAV proper!

wave.play(); // make some noise!

uint8_t n = 0;

while (wave.isplaying) {// playing occurs in interrupts, so we print dots in realtime

putstring(".");

if (!(++n % 32))Serial.println();

delay(100);

}

sdErrorCheck(); // everything OK?

// if (wave.errors)Serial.println(wave.errors); // wave decoding errors

}

}

}

}

如果一切正常的話,下載此程序后即可開始播放.如果你一時沒有合適的資源,請下載本文后面的附件中本人的資源進行播放.

總結(jié)與參考

這個Arduino的Shield模塊具備了音頻播放器的種種功能,因為配備了SD卡, 使得資源不成問題.受限于主控性能, 不能解碼一些流行格式如MP3,AAC,但是轉(zhuǎn)換也是個一次性的工作,也不顯得非常麻煩.筆者自己轉(zhuǎn)換了幾十集的評書, 準備每天回來聽一集. 總體來說,這個模塊很有味道, 值得喜歡音頻的同學(xué)買一塊或者DIY一塊.

此模塊的官方連接: https://www.adafruit.com/product/94

本人的資源供參考使用: 鏈接: https://pan.baidu.com/s/1caYUvG 密碼: enfw

(注意要放在SD卡的根目錄)

這些開發(fā)板你一定沒玩過！來開發(fā)板試用中心免費借閱吧~

  • 本文系21ic原創(chuàng)，未經(jīng)許可禁止轉(zhuǎn)載!

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