initial commit

libraries/WaveHC/examples/PiSpeakHC/PiSpeakHC.ino

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+/*
+ * Text-to-speech example to speak the first n digits of pi.
+ * The number is stored in flash, each digit is spoken one at a time.
+ */
+#include <WaveHC.h>
+#include <WaveUtil.h>
+
+// put pi in flash memory
+const char pi[] PROGMEM = "3.1415926535897932384626433832795028841971693993751058209749";
+
+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 volumes root directory
+FatReader file;   // This object represent the WAV file for a pi digit or period
+WaveHC wave;      // This is the only wave (audio) object, since we will only play one at a time
+/*
+ * Define macro to put error messages in flash memory
+ */
+#define error(msg) error_P(PSTR(msg))
+
+//////////////////////////////////// SETUP
+
+void setup() {
+  // set up Serial library at 9600 bps
+  Serial.begin(9600);           
+  
+  PgmPrintln("Pi speaker");
+  
+  if (!card.init()) {
+    error("Card init. failed!");
+  }
+  if (!vol.init(card)) {
+    error("No partition!");
+  }
+  if (!root.openRoot(vol)) {
+    error("Couldn't open dir");
+  }
+
+  PgmPrintln("Files found:");
+  root.ls();
+}
+
+/////////////////////////////////// LOOP
+
+unsigned digit = 0;
+
+void loop() { 
+  // get next character from flash memory
+  char c = pgm_read_byte(&pi[digit++]);
+   
+  if (c == 0) {
+    digit = 0;
+    Serial.println();
+    return;
+  }
+  Serial.write(c);
+    
+  speaknum(c);
+   
+  delay(10);
+}
+
+/////////////////////////////////// HELPERS
+
+char filename[13];
+void speaknum(char c) {
+  uint8_t i=0;
+  
+  // copy flash string for 'period' to filename
+  strcpy_P(filename, PSTR("P.WAV"));
+  
+  if ('0' <= c && c <= '9') {
+    // digit - change 'P' to digit
+    filename[0] = c;
+    i = 1;
+  } 
+  else if (c != '.') {
+    // error if not period
+    return;
+  }
+  playcomplete(filename);
+}
+/*
+ * print error message and halt
+ */
+void error_P(const char *str) {
+  PgmPrint("Error: ");
+  SerialPrint_P(str);
+  sdErrorCheck();
+  while(1);
+}
+/*
+ * print error message and halt if SD I/O error
+ */
+void sdErrorCheck(void) {
+  if (!card.errorCode()) return;
+  PgmPrint("\r\nSD I/O error: ");
+  Serial.print(card.errorCode(), HEX);
+  PgmPrint(", ");
+  Serial.println(card.errorData(), HEX);
+  while(1);
+}
+/*
+ * Play a file and wait for it to complete
+ */
+void playcomplete(char *name) {
+  playfile(name);
+  while (wave.isplaying);
+  
+  // see if an error occurred while playing
+  sdErrorCheck();
+}
+/*
+ * Open and start playing a WAV file
+ */
+void playfile(char *name) {
+  if (wave.isplaying) {// already playing something, so stop it!
+    wave.stop(); // stop it
+  }
+  if (!file.open(root, name)) {
+    PgmPrint("Couldn't open file ");
+    Serial.print(name); 
+    return;
+  }
+  if (!wave.create(file)) {
+    PgmPrintln("Not a valid WAV");
+    return;
+  }
+  // ok time to play!
+  wave.play();
+}