SPDIFStream compile support for rp2040

Author: pschatzmann

src/AudioConfig.h

@@ -225,7 +225,7 @@ typedef uint32_t eps32_i2s_sample_rate_type;
 //----------------
 #if defined(ARDUINO_ARCH_RP2040) 
 //#define USE_ESP8266_AUDIO
-//#define USE_I2S 1
+#define USE_I2S 1
 #define USE_PWM
 
 #define PWM_START_PIN 6

src/AudioExperiments/AudioSPDIF.h

@@ -1,15 +1,15 @@
 /**
  * @file AudioSPDIF.h
  * @author amedes / Phil Schatzmann
- * @brief S/PDIF output via I2S
+ * @brief S/PDIF output
 
     This example code is in the Public Domain (or CC0 licensed, at your option.)
     Unless required by applicable law or agreed to in writing, this
     software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
     CONDITIONS OF ANY KIND, either express or implied.
 
 
- * @date 2022-01-23
+ * @date 2022-01-30
  *
  * @copyright  (C) 2020 AMEDES, 2022 Phil Schatzmann
  *
@@ -23,7 +23,7 @@
 // Set USE_ESP32_I2S to 1 if you want to use the explicit ESP32 implementation.
 // 0 for generic implementation
 #ifndef USE_ESP32_I2S
-#define USE_ESP32_I2S 1
+#define USE_ESP32_I2S 0
 #endif
 
 // Default Data Pin
@@ -150,9 +150,10 @@ class SPDIFOutI2S : public SPDIFOut {
     i2s_cfg.pin_ws = -1;
     i2s_cfg.pin_bck = -1;
     i2s_cfg.pin_data = cfg.pin_data;
+#ifdef ESP32
     i2s_cfg.use_apll = true;
     i2s_cfg.fixed_mclk = mclk;
-
+#endif
     i2s.begin(i2s_cfg);
   }
 
@@ -169,6 +170,7 @@ class SPDIFOutI2S : public SPDIFOut {
   I2SStream i2s;
 };
 
+#ifdef ESP32
 /**
  * @brief ESP32 specific Output 
  * 
@@ -219,6 +221,8 @@ class SPDFOutI2SESP32 : public SPDIFOut {
   }
 };
 
+#endif
+
 /**
  * @brief Generic output of SPDIF to Arduino Stream
  *
@@ -381,7 +385,7 @@ class SPDIFStream : public AudioStreamX {
    }
 
   /// start SPDIF with default configuration
-  bool begin() { spdif.begin(); }
+  bool begin() { return spdif.begin(); }
   /// start SPDIF with the indicated configuration
   bool begin(SPDIFConfig cfg) {
     this->cfg = cfg;
@@ -398,7 +402,8 @@ class SPDIFStream : public AudioStreamX {
     targetSpdifConfig.channels = 2;
     targetSpdifConfig.bits_per_sample = 16;
     targetSpdifConfig.sample_rate = cfg.sample_rate;
-    spdif.begin(targetSpdifConfig);
+    return spdif.begin(targetSpdifConfig);
+    
   }
 
   /// Close the SPDIF processing