ARDUINO UNO简易音乐播放器实现

#include <SimpleSDAudio.h>



// Callback target, prints output to serial

void DirCallback(char *buf) { 

  Serial.println(buf);

}



char AudioFileName[16];



// Create static buffer 

#define BIGBUFSIZE (2*512)      // bigger than 2*512 is often only possible on Arduino megas!

uint8_t bigbuf[BIGBUFSIZE];



// helper function to determine free ram at runtime

int freeRam () {

  extern int __heap_start, *__brkval; 

  int v; 

  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval); 

}



void setup()

{

// Open serial communications and wait for port to open:

  Serial.begin(9600);

   while (!Serial) {

    ; // wait for serial port to connect. Needed for Leonardo only

  }

  

  Serial.print(F("Free Ram: "));

  Serial.println(freeRam());

  

  // Setting the buffer manually for more flexibility

  SdPlay.setWorkBuffer(bigbuf, BIGBUFSIZE); 

  

  Serial.print(F("\nInitializing SimpleSDAudio V" SSDA_VERSIONSTRING " ..."));  

  

  // If your SD card CS-Pin is not at Pin 4, enable and adapt the following line:

  //SdPlay.setSDCSPin(10);

  

  // Select between SSDA_MODE_FULLRATE or SSDA_MODE_HALFRATE (62.5kHz or 31.25kHz)

  // and the output modes SSDA_MODE_MONO_BRIDGE, SSDA_MODE_MONO or SSDA_MODE_STEREO

  if (!SdPlay.init(SSDA_MODE_FULLRATE | SSDA_MODE_MONO | SSDA_MODE_AUTOWORKER)) {

    Serial.println(F("initialization failed. Things to check:"));

    Serial.println(F("* is a card is inserted?"));

    Serial.println(F("* Is your wiring correct?"));

    Serial.println(F("* maybe you need to change the chipSelect pin to match your shield or module?"));

    Serial.print(F("Error code: "));

    Serial.println(SdPlay.getLastError());

    while(1);

  } else {

    Serial.println(F("Wiring is correct and a card is present.")); 

  }

  



}





void loop(void) {

  uint8_t count=0, c, flag;

  

  Serial.println(F("Files on card:"));

  SdPlay.dir(&DirCallback);



ReEnter: 

  count = 0;

  Serial.println(F("\r\nEnter filename (send newline after input):"));

  do {

    while(!Serial.available()) ;

    c = Serial.read();

    if(c > ' ') AudioFileName[count++] = c;

  } while((c != 0x0d) && (c != 0x0a) && (count < 14));

  AudioFileName[count++] = 0;

  

  Serial.print(F("Looking for file... "));

  if(!SdPlay.setFile(AudioFileName)) {

    Serial.println(F(" not found on card! Error code: "));

    Serial.println(SdPlay.getLastError());

    goto ReEnter;

  } else {

   Serial.println(F("found.")); 

  }    



  Serial.println(F("Press s for stop, p for play, h for pause, f to select new file, d for deinit, v to view status.")); 

  flag = 1;

  

  while(flag) {

    SdPlay.worker();  // You can remove this line if you like - worker is not necessary

    if(Serial.available()) {

      c = Serial.read();

      switch(c) {

         case 's':

           SdPlay.stop();

           Serial.println(F("Stopped."));

           break; 

           

         case 'p':

           SdPlay.play();

           Serial.println(F("Play."));

           break;

           

         case 'h':

           SdPlay.pause();

           Serial.println(F("Pause."));

           break;   

   

         case 'd':

           SdPlay.deInit();

           Serial.println(F("SdPlay deinitialized. You can now safely remove card. System halted."));

           while(1) ;

           break;  

             

         case 'f':

           flag = 0;

           break; 

     

         case 'v':

           Serial.print(F("Status: isStopped="));

           Serial.print(SdPlay.isStopped());

           Serial.print(F(", isPlaying="));

           Serial.print(SdPlay.isPlaying());

           Serial.print(F(", isPaused="));

           Serial.print(SdPlay.isPaused());

           Serial.print(F(", isUnderrunOccured="));

           Serial.print(SdPlay.isUnderrunOccured());

           Serial.print(F(", getLastError="));

           Serial.println(SdPlay.getLastError());

           Serial.print(F("Free RAM: "));

           Serial.println(freeRam());

           break;      

      } 

    }

  }

  

  

}