Merge branch 'master' into playback-loop

Adafruit_VS1053.cpp

@@ -327,6 +327,23 @@ void Adafruit_VS1053_FilePlayer::feedBuffer_noLock(void) {
   }
 }
 
+// get current playback speed. 0 or 1 indicates normal speed
+uint16_t Adafruit_VS1053_FilePlayer::getPlaySpeed() {
+  noInterrupts();
+  sciWrite(VS1053_SCI_WRAMADDR, VS1053_PARA_PLAYSPEED);
+  uint16_t speed = sciRead(VS1053_SCI_WRAM);
+  interrupts();
+  return speed;
+}
+
+// set playback speed: 0 or 1 for normal speed, 2 for 2x, 3 for 3x, etc.
+void Adafruit_VS1053_FilePlayer::setPlaySpeed(uint16_t speed) {
+  noInterrupts();
+  sciWrite(VS1053_SCI_WRAMADDR, VS1053_PARA_PLAYSPEED);
+  sciWrite(VS1053_SCI_WRAM, speed);
+  interrupts();
+}
+
 /***************************************************************/
 
 /* VS1053 'low level' interface */

Adafruit_VS1053.h

@@ -107,6 +107,10 @@ typedef volatile RwReg PortReg; //!< Type definition/alias used to specify the
   0x0E //!< SCI_AICTRL register 2. Used to access the user's application program
 #define VS1053_SCI_AICTRL3                                                     \
   0x0F //!< SCI_AICTRL register 3. Used to access the user's application program
+#define VS1053_SCI_WRAM 0x06     //!< RAM write/read
+#define VS1053_SCI_WRAMADDR 0x07 //!< Base address for RAM write/read
+
+#define VS1053_PARA_PLAYSPEED 0x1E04 //!< 0,1 = normal speed, 2 = 2x, 3 = 3x etc
 
 #define VS1053_DATABUFFERLEN 32 //!< Length of the data buffer
 
@@ -399,6 +403,15 @@ class Adafruit_VS1053_FilePlayer : public Adafruit_VS1053 {
    * @return Returns true when looped playback is enabled
    */
   boolean playbackLooped();
+   * @brief Determine current playback speed
+   * @return Returns playback speed, i.e. 1 for 1x, 2 for 2x, 3 for 3x
+   */
+  uint16_t getPlaySpeed();
+  /*!
+   * @brief Set playback speed
+   * @param speed Set playback speed, i.e. 1 for 1x, 2 for 2x, 3 for 3x
+   */
+  void setPlaySpeed(uint16_t speed);
 
 private:
   void feedBuffer_noLock(void);