compatibility with Arduino UNO R4 Wifi

faced compilation errors when compiling the library with Arduino R4 Uno Wifi:

1. fatal error: wiring_private.h: No such file or directory
 #include "wiring_private.h"

2. Arduino.h:75:92: error: cannot convert 'volatile uint16_t* {aka volatile short unsigned int*}' to 'PortReg* {aka volatile long unsigned int*}' in assignment
 #define portOutputRegister(port)    &(((R_PORT0_Type *)IOPORT_PRV_PORT_ADDRESS(port))->PODR)

Adafruit_VS1053.cpp:332:16: note: in expansion of macro 'portOutputRegister'
   clkportreg = portOutputRegister(digitalPinToPort(_clk));

Adafruit_VS1053.cpp

@@ -25,7 +25,7 @@
 
 #include <Adafruit_VS1053.h>
 
-#if defined(ARDUINO_STM32_FEATHER) 
+#if defined(ARDUINO_STM32_FEATHER)
 #define digitalPinToInterrupt(x) x
 #endif
 
@@ -40,6 +40,7 @@ SIGNAL(TIMER0_COMPA_vect) { myself->feedBuffer(); }
 #endif
 
 volatile boolean feedBufferLock = false; //!< Locks feeding the buffer
+boolean _loopPlayback; //!< internal variable, used to control playback looping
 
 #if defined(ESP8266)
 ICACHE_RAM_ATTR
@@ -102,6 +103,7 @@ Adafruit_VS1053_FilePlayer::Adafruit_VS1053_FilePlayer(int8_t rst, int8_t cs,
 
   playingMusic = false;
   _cardCS = cardcs;
+  _loopPlayback = false;
 }
 
 Adafruit_VS1053_FilePlayer::Adafruit_VS1053_FilePlayer(int8_t cs, int8_t dcs,
@@ -111,6 +113,7 @@ Adafruit_VS1053_FilePlayer::Adafruit_VS1053_FilePlayer(int8_t cs, int8_t dcs,
 
   playingMusic = false;
   _cardCS = cardcs;
+  _loopPlayback = false;
 }
 
 Adafruit_VS1053_FilePlayer::Adafruit_VS1053_FilePlayer(int8_t mosi, int8_t miso,
@@ -122,6 +125,7 @@ Adafruit_VS1053_FilePlayer::Adafruit_VS1053_FilePlayer(int8_t mosi, int8_t miso,
 
   playingMusic = false;
   _cardCS = cardcs;
+  _loopPlayback = false;
 }
 
 boolean Adafruit_VS1053_FilePlayer::begin(void) {
@@ -174,6 +178,12 @@ boolean Adafruit_VS1053_FilePlayer::stopped(void) {
   return (!playingMusic && !currentTrack);
 }
 
+void Adafruit_VS1053_FilePlayer::playbackLoop(boolean loopState) {
+  _loopPlayback = loopState;
+}
+
+boolean Adafruit_VS1053_FilePlayer::playbackLooped() { return _loopPlayback; }
+
 // Just checks to see if the name ends in ".mp3"
 boolean Adafruit_VS1053_FilePlayer::isMP3File(const char *fileName) {
   return (strlen(fileName) > 4) &&
@@ -297,16 +307,43 @@ void Adafruit_VS1053_FilePlayer::feedBuffer_noLock(void) {
     int bytesread = currentTrack.read(mp3buffer, VS1053_DATABUFFERLEN);
 
     if (bytesread == 0) {
-      // must be at the end of the file, wrap it up!
-      playingMusic = false;
-      currentTrack.close();
-      break;
+      // must be at the end of the file
+      if (_loopPlayback) {
+        // play in loop
+        if (isMP3File(currentTrack.name())) {
+          currentTrack.seek(mp3_ID3Jumper(currentTrack));
+        } else {
+          currentTrack.seek(0);
+        }
+      } else {
+        // wrap it up!
+        playingMusic = false;
+        currentTrack.close();
+        break;
+      }
     }
 
     playData(mp3buffer, bytesread);
   }
 }
 
+// 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 */
@@ -669,4 +706,4 @@ void Adafruit_VS1053::sineTest(uint8_t n, uint16_t ms) {
   spi_dev_data->write(sine_start, 8);
   delay(ms);
   spi_dev_data->write(sine_stop, 8);
-}
+}

Adafruit_VS1053.h

@@ -109,6 +109,10 @@ 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
 
@@ -389,11 +393,33 @@ class Adafruit_VS1053_FilePlayer : public Adafruit_VS1053 {
    * @param pause whether or not to pause playback
    */
   void pausePlaying(boolean pause);
+  /*!
+   * @brief Set state for playback looping
+   * @param loopState Sets playback loop state (Note: Only use with
+   * startPlayingFile, if used with playFullFile no subsequent code in the
+   * sketch executes)
+   */
+  void playbackLoop(boolean loopState);
+  /*!
+   * @brief Retrieve playback loop state
+   * @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);
 
   uint8_t _cardCS;
 };
 
-#endif // ADAFRUIT_VS1053_H
+#endif // ADAFRUIT_VS1053_H