Default back to initialisation at construction time, with option to d…

…efer

SPIClass constructor has been fixed ... we hope

extmem.cpp

@@ -233,12 +233,12 @@ uint32_t AudioExtMem::findMaxSpace(AudioEffectDelayMemoryType_t memory_type)
  * object is initialised, so if the memory type in use is SPI-based we
  * wait until the first delay() call is made.
  */
-void AudioExtMem::preInitialize(AudioEffectDelayMemoryType_t type, uint32_t samples)
+void AudioExtMem::preInitialize(AudioEffectDelayMemoryType_t type, uint32_t samples, bool forceInitialize)
 {
 	memory_type = type;
 	memory_length = samples;
 
-	if (!IS_SPI_TYPE)
+	if (!IS_SPI_TYPE || forceInitialize)
 		initialize();
 }
 

extmem.h

@@ -58,17 +58,19 @@ enum AudioEffectDelayMemoryType_t {
 class AudioExtMem
 {
 public:
-	AudioExtMem(AudioEffectDelayMemoryType_t type, uint32_t samples = AUDIO_SAMPLE_RATE_EXACT)
+	AudioExtMem(AudioEffectDelayMemoryType_t type, 
+				uint32_t samples = AUDIO_SAMPLE_RATE_EXACT,
+				bool forceInitialize = true)
 		: memory_begin(0), initialisationDone(false)
 	{
-		preInitialize(type, samples);
+		preInitialize(type, samples, forceInitialize);
 	}
 	AudioExtMem() :	AudioExtMem(AUDIO_MEMORY_23LC1024, 65536) {}
 	~AudioExtMem();
 	float getMaxDelay(void) {return (float) memory_length * 1000.0f / AUDIO_SAMPLE_RATE_EXACT;}
 
 private:	
-	void preInitialize(AudioEffectDelayMemoryType_t type, uint32_t samples);
+	void preInitialize(AudioEffectDelayMemoryType_t type, uint32_t samples, bool forceInitialize);
 	inline static void SPIreadMany(int16_t* data, uint32_t samples);
 	inline static void SPIwriteMany(const int16_t* data, uint32_t samples);
 	//static uint32_t allocated[AUDIO_MEMORY_UNDEFINED];