Achieved performance goal on DMA

src/AudioEffectAnalogDelay.cpp

@@ -138,7 +138,7 @@ void AudioEffectAnalogDelay::update(void)
 	if (m_externalMemory && m_memory->getSlot()->isUseDma()) {
 	    // Using DMA
 		unsigned loopCount = 0;
-		while (m_memory->getSlot()->isReadBusy()) { /*Serial.println(String("RB:") + loopCount); loopCount++; */}
+		while (m_memory->getSlot()->isReadBusy()) {}
 	}
 
 	// perform the wet/dry mix mix
@@ -148,12 +148,12 @@ void AudioEffectAnalogDelay::update(void)
 	release(inputAudioBlock);
 	release(m_previousBlock);
 	m_previousBlock = blockToOutput;
+
 	if (m_externalMemory && m_memory->getSlot()->isUseDma()) {
 	    // Using DMA
-		unsigned loopCount = 0;
+		if (m_blockToRelease) release(m_blockToRelease);
-		while (m_memory->getSlot()->isWriteBusy()) { /*Serial.println(String("WB:") + loopCount); loopCount++; */}
+		m_blockToRelease = blockToRelease;
 	}
-	if (blockToRelease) release(blockToRelease);
 }
 
 void AudioEffectAnalogDelay::delay(float milliseconds)

src/AudioEffectAnalogDelay.h

@@ -45,6 +45,7 @@ private:
 	AudioDelay *m_memory = nullptr;
 	size_t m_maxDelaySamples = 0;
 	audio_block_t *m_previousBlock = nullptr;
+	audio_block_t *m_blockToRelease  = nullptr;
 	IirBiQuadFilterHQ *m_iir = nullptr;
 
 	// Controls

src/BASpiMemory.cpp

@@ -372,12 +372,12 @@ void BASpiMemoryDMA::write(size_t address, uint8_t *src, size_t numBytes)
 	size_t nextAddress = address;
 	while (bytesRemaining > 0) {
 		m_txXferCount = min(bytesRemaining, MAX_DMA_XFER_SIZE);
-		while ( m_txTransfer[1].busy()) {Serial.println("W1");} // wait until not busy
+		while ( m_txTransfer[1].busy()) {} // wait until not busy
 		m_setSpiCmdAddr(SPI_WRITE_CMD, nextAddress, m_txCommandBuffer);
 		m_txTransfer[1] = DmaSpi::Transfer(m_txCommandBuffer, CMD_ADDRESS_SIZE, nullptr, 0, m_cs, TransferType::NO_END_CS);
 		m_spiDma->registerTransfer(m_txTransfer[1]);
 
-		while ( m_txTransfer[0].busy()) { Serial.println("W2");} // wait until not busy
+		while ( m_txTransfer[0].busy()) {} // wait until not busy
 		m_txTransfer[0] = DmaSpi::Transfer(srcPtr, m_txXferCount, nullptr, 0, m_cs, TransferType::NO_START_CS);
 		m_spiDma->registerTransfer(m_txTransfer[0]);
 		bytesRemaining -= m_txXferCount;
@@ -426,12 +426,12 @@ void BASpiMemoryDMA::read(size_t address, uint8_t *dest, size_t numBytes)
 	while (bytesRemaining > 0) {
 		m_setSpiCmdAddr(SPI_READ_CMD, nextAddress, m_rxCommandBuffer);
 
-		while ( m_rxTransfer[1].busy()) { Serial.println("R1"); }
+		while ( m_rxTransfer[1].busy()) {}
 		m_rxTransfer[1] = DmaSpi::Transfer(m_rxCommandBuffer, CMD_ADDRESS_SIZE, nullptr, 0, m_cs, TransferType::NO_END_CS);
 		m_spiDma->registerTransfer(m_rxTransfer[1]);
 
 		m_rxXferCount = min(bytesRemaining, MAX_DMA_XFER_SIZE);
-		while ( m_rxTransfer[0].busy()) {Serial.println("R2");}
+		while ( m_rxTransfer[0].busy()) {}
 		m_rxTransfer[0] = DmaSpi::Transfer(nullptr, m_rxXferCount, destPtr, 0, m_cs, TransferType::NO_START_CS);
 		m_spiDma->registerTransfer(m_rxTransfer[0]);