//This is the simplest example. It plays every audio file it //finds on the SD card in a loop. #include #include #include #include "WaveUtil.h" #include "WaveHC.h" SdReader card; // This object holds the information for the card FatVolume vol; // This holds the information for the partition on the card FatReader root; // This holds the information for the filesystem on the card uint8_t dirLevel; // indent level for file/dir names (for prettyprinting) dir_t dirBuf; // buffer for directory reads WaveHC wave; // This is the only wave (audio) object, since we will only play one at a time // Function definitions (we define them here, but the code is below) void lsR(FatReader &d); void play(FatReader &dir); void setup() { Serial.begin(9600); // set up Serial library at 9600 bps for debugging putstring_nl("\nWave test!"); // say we woke up! putstring("Free RAM: "); // This can help with debugging, running out of RAM is bad Serial.println(freeRam()); // Set the output pins for the DAC control. This pins are defined in the library pinMode(2, OUTPUT); pinMode(3, OUTPUT); pinMode(4, OUTPUT); pinMode(5, OUTPUT); // if (!card.init(true)) { //play with 4 MHz spi if 8MHz isn't working for you if (!card.init()) { //play with 8 MHz spi (default faster!) putstring_nl("Card init. failed!"); // Something went wrong, lets print out why sdErrorCheck(); while(1); // then 'halt' - do nothing! } // enable optimize read - some cards may timeout. Disable if you're having problems card.partialBlockRead(true); // Now we will look for a FAT partition! uint8_t part; for (part = 0; part < 5; part++) { // we have up to 5 slots to look in if (vol.init(card, part)) break; // we found one, lets bail } if (part == 5) { // if we ended up not finding one :( putstring_nl("No valid FAT partition!"); sdErrorCheck(); // Something went wrong, lets print out why while(1); // then 'halt' - do nothing! } // Lets tell the user about what we found putstring("Using partition "); Serial.print(part, DEC); putstring(", type is FAT"); Serial.println(vol.fatType(),DEC); // FAT16 or FAT32? // Try to open the root directory if (!root.openRoot(vol)) { putstring_nl("Can't open root dir!"); // Something went wrong, while(1); // then 'halt' - do nothing! } // Whew! We got past the tough parts. putstring_nl("Files found:"); dirLevel = 0; // Print out all of the files in all the directories. lsR(root); } //////////////////////////////////// LOOP void loop() { root.rewind(); play(root); } /////////////////////////////////// HELPERS // this handy function will return the number of bytes currently free in RAM, great for debugging! int freeRam(void) { extern int __bss_end; extern int *__brkval; int free_memory; if((int)__brkval == 0) { free_memory = ((int)&free_memory) - ((int)&__bss_end); } else { free_memory = ((int)&free_memory) - ((int)__brkval); } return free_memory; } /* * print error message and halt if SD I/O error, great for debugging! */ void sdErrorCheck(void) { if (!card.errorCode()) return; putstring("\n\rSD I/O error: "); Serial.print(card.errorCode(), HEX); putstring(", "); Serial.println(card.errorData(), HEX); while(1); } /* * print dir_t name field. The output is 8.3 format, so like SOUND.WAV or FILENAME.DAT */ void printName(dir_t &dir) { for (uint8_t i = 0; i < 11; i++) { // 8.3 format has 8+3 = 11 letters in it if (dir.name[i] == ' ') continue; // dont print any spaces in the name if (i == 8) Serial.print('.'); // after the 8th letter, place a dot Serial.print(dir.name[i]); // print the n'th digit } if (DIR_IS_SUBDIR(dir)) Serial.print('/'); // directories get a / at the end } /* * list recursively - possible stack overflow if subdirectories too nested */ void lsR(FatReader &d) { int8_t r; // indicates the level of recursion while ((r = d.readDir(dirBuf)) > 0) { // read the next file in the directory // skip subdirs . and .. if (dirBuf.name[0] == '.') continue; for (uint8_t i = 0; i < dirLevel; i++) Serial.print(' '); // this is for prettyprinting, put spaces in front printName(dirBuf); // print the name of the file we just found Serial.println(); // and a new line if (DIR_IS_SUBDIR(dirBuf)) { // we will recurse on any direcory FatReader s; // make a new directory object to hold information dirLevel += 2; // indent 2 spaces for future prints if (s.open(vol, dirBuf)) lsR(s); // list all the files in this directory now! dirLevel -=2; // remove the extra indentation } } sdErrorCheck(); // are we doign OK? } /* * 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 . and .. directories if (dirBuf.name[0] == '.') continue; Serial.println(); // clear out a new line for (uint8_t i = 0; i < dirLevel; i++) Serial.print(' '); // this is for prettyprinting, put spaces in front if (!file.open(vol, dirBuf)) { // open the file in the directory Serial.println("file.open failed"); // something went wrong :( while(1); // halt } if (file.isDir()) { // check if we opened a new directory putstring("Subdir: "); printName(dirBuf); 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 "); printName(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! while (wave.isplaying) { // playing occurs in interrupts, so we print dots in realtime putstring("."); delay(100); } sdErrorCheck(); // everything OK? // if (wave.errors)Serial.println(wave.errors); // wave decoding errors } } } }