Split I2S input & output to their own files

input_i2s.cpp

+#include "Audio.h"
+#include "arm_math.h"
+
+
+DMAMEM static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
+audio_block_t * AudioInputI2S::block_left = NULL;
+audio_block_t * AudioInputI2S::block_right = NULL;
+uint16_t AudioInputI2S::block_offset = 0;
+bool AudioInputI2S::update_responsibility = false;
+
+
+void AudioInputI2S::begin(void)
+{
+	//block_left_1st = NULL;
+	//block_right_1st = NULL;
+
+	//pinMode(3, OUTPUT);
+	//digitalWriteFast(3, HIGH);
+	//delayMicroseconds(500);
+	//digitalWriteFast(3, LOW);
+
+	AudioOutputI2S::config_i2s();
+
+	CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0
+
+	DMA_CR = 0;
+	DMA_TCD1_SADDR = &I2S0_RDR0;
+	DMA_TCD1_SOFF = 0;
+	DMA_TCD1_ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
+	DMA_TCD1_NBYTES_MLNO = 2;
+	DMA_TCD1_SLAST = 0;
+	DMA_TCD1_DADDR = i2s_rx_buffer;
+	DMA_TCD1_DOFF = 2;
+	DMA_TCD1_CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
+	DMA_TCD1_DLASTSGA = -sizeof(i2s_rx_buffer);
+	DMA_TCD1_BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
+	DMA_TCD1_CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
+
+	DMAMUX0_CHCFG1 = DMAMUX_DISABLE;
+	DMAMUX0_CHCFG1 = DMAMUX_SOURCE_I2S0_RX | DMAMUX_ENABLE;
+	update_responsibility = update_setup();
+	DMA_SERQ = 1;
+
+	// TODO: is I2S_RCSR_BCE appropriate if sync'd to transmitter clock?
+	//I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR;
+	I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_FRDE | I2S_RCSR_FR;
+	NVIC_ENABLE_IRQ(IRQ_DMA_CH1);
+}
+
+void dma_ch1_isr(void)
+{
+	uint32_t daddr, offset;
+	const int16_t *src, *end;
+	int16_t *dest_left, *dest_right;
+	audio_block_t *left, *right;
+
+	//digitalWriteFast(3, HIGH);
+	daddr = (uint32_t)DMA_TCD1_DADDR;
+        DMA_CINT = 1;
+
+	if (daddr < (uint32_t)i2s_rx_buffer + sizeof(i2s_rx_buffer) / 2) {
+		// DMA is receiving to the first half of the buffer
+		// need to remove data from the second half
+		src = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2];
+		end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
+		if (AudioInputI2S::update_responsibility) AudioStream::update_all();
+	} else {
+		// DMA is receiving to the second half of the buffer
+		// need to remove data from the first half
+		src = (int16_t *)&i2s_rx_buffer[0];
+		end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2];
+	}
+	left = AudioInputI2S::block_left;
+	right = AudioInputI2S::block_right;
+	if (left != NULL && right != NULL) {
+		offset = AudioInputI2S::block_offset;
+		if (offset <= AUDIO_BLOCK_SAMPLES/2) {
+			dest_left = &(left->data[offset]);
+			dest_right = &(right->data[offset]);
+			AudioInputI2S::block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
+			do {
+				//n = *src++;
+				//*dest_left++ = (int16_t)n;
+				//*dest_right++ = (int16_t)(n >> 16);
+				*dest_left++ = *src++;
+				*dest_right++ = *src++;
+			} while (src < end);
+		}
+	}
+	//digitalWriteFast(3, LOW);
+}
+
+
+
+void AudioInputI2S::update(void)
+{
+	audio_block_t *new_left=NULL, *new_right=NULL, *out_left=NULL, *out_right=NULL;
+
+	// allocate 2 new blocks, but if one fails, allocate neither
+	new_left = allocate();
+	if (new_left != NULL) {
+		new_right = allocate();
+		if (new_right == NULL) {
+			release(new_left);
+			new_left = NULL;
+		}
+	}
+	__disable_irq();
+	if (block_offset >= AUDIO_BLOCK_SAMPLES) {
+		// the DMA filled 2 blocks, so grab them and get the
+		// 2 new blocks to the DMA, as quickly as possible
+		out_left = block_left;
+		block_left = new_left;
+		out_right = block_right;
+		block_right = new_right;
+		block_offset = 0;
+		__enable_irq();
+		// then transmit the DMA's former blocks
+		transmit(out_left, 0);
+		release(out_left);
+		transmit(out_right, 1);
+		release(out_right);
+		//Serial.print(".");
+	} else if (new_left != NULL) {
+		// the DMA didn't fill blocks, but we allocated blocks
+		if (block_left == NULL) {
+			// the DMA doesn't have any blocks to fill, so
+			// give it the ones we just allocated
+			block_left = new_left;
+			block_right = new_right;
+			block_offset = 0;
+			__enable_irq();
+		} else {
+			// the DMA already has blocks, doesn't need these
+			__enable_irq();
+			release(new_left);
+			release(new_right);
+		}
+	} else {
+		// The DMA didn't fill blocks, and we could not allocate
+		// memory... the system is likely starving for memory!
+		// Sadly, there's nothing we can do.
+		__enable_irq();
+	}
+}
+
+
+/******************************************************************/
+
+
+void AudioInputI2Sslave::begin(void)
+{
+	//block_left_1st = NULL;
+	//block_right_1st = NULL;
+
+	//pinMode(3, OUTPUT);
+	//digitalWriteFast(3, HIGH);
+	//delayMicroseconds(500);
+	//digitalWriteFast(3, LOW);
+
+	AudioOutputI2Sslave::config_i2s();
+
+	CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0
+
+	DMA_CR = 0;
+	DMA_TCD1_SADDR = &I2S0_RDR0;
+	DMA_TCD1_SOFF = 0;
+	DMA_TCD1_ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
+	DMA_TCD1_NBYTES_MLNO = 2;
+	DMA_TCD1_SLAST = 0;
+	DMA_TCD1_DADDR = i2s_rx_buffer;
+	DMA_TCD1_DOFF = 2;
+	DMA_TCD1_CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
+	DMA_TCD1_DLASTSGA = -sizeof(i2s_rx_buffer);
+	DMA_TCD1_BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
+	DMA_TCD1_CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
+
+	DMAMUX0_CHCFG1 = DMAMUX_DISABLE;
+	DMAMUX0_CHCFG1 = DMAMUX_SOURCE_I2S0_RX | DMAMUX_ENABLE;
+	update_responsibility = update_setup();
+	DMA_SERQ = 1;
+
+	// TODO: is I2S_RCSR_BCE appropriate if sync'd to transmitter clock?
+	//I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR;
+	I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_FRDE | I2S_RCSR_FR;
+	NVIC_ENABLE_IRQ(IRQ_DMA_CH1);
+}
+
+
+
+

output_i2s.cpp

 	CORE_PIN11_CONFIG = PORT_PCR_MUX(6); // pin 11, PTC6, I2S0_MCLK
 }
 
-/******************************************************************/
-
-
-DMAMEM static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
-audio_block_t * AudioInputI2S::block_left = NULL;
-audio_block_t * AudioInputI2S::block_right = NULL;
-uint16_t AudioInputI2S::block_offset = 0;
-bool AudioInputI2S::update_responsibility = false;
-
-
-void AudioInputI2S::begin(void)
-{
-	//block_left_1st = NULL;
-	//block_right_1st = NULL;
-
-	//pinMode(3, OUTPUT);
-	//digitalWriteFast(3, HIGH);
-	//delayMicroseconds(500);
-	//digitalWriteFast(3, LOW);
-
-	AudioOutputI2S::config_i2s();
-
-	CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0
-
-	DMA_CR = 0;
-	DMA_TCD1_SADDR = &I2S0_RDR0;
-	DMA_TCD1_SOFF = 0;
-	DMA_TCD1_ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
-	DMA_TCD1_NBYTES_MLNO = 2;
-	DMA_TCD1_SLAST = 0;
-	DMA_TCD1_DADDR = i2s_rx_buffer;
-	DMA_TCD1_DOFF = 2;
-	DMA_TCD1_CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
-	DMA_TCD1_DLASTSGA = -sizeof(i2s_rx_buffer);
-	DMA_TCD1_BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
-	DMA_TCD1_CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
-
-	DMAMUX0_CHCFG1 = DMAMUX_DISABLE;
-	DMAMUX0_CHCFG1 = DMAMUX_SOURCE_I2S0_RX | DMAMUX_ENABLE;
-	update_responsibility = update_setup();
-	DMA_SERQ = 1;
-
-	// TODO: is I2S_RCSR_BCE appropriate if sync'd to transmitter clock?
-	//I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR;
-	I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_FRDE | I2S_RCSR_FR;
-	NVIC_ENABLE_IRQ(IRQ_DMA_CH1);
-}
-
-void dma_ch1_isr(void)
-{
-	uint32_t daddr, offset;
-	const int16_t *src, *end;
-	int16_t *dest_left, *dest_right;
-	audio_block_t *left, *right;
-
-	//digitalWriteFast(3, HIGH);
-	daddr = (uint32_t)DMA_TCD1_DADDR;
-        DMA_CINT = 1;
-
-	if (daddr < (uint32_t)i2s_rx_buffer + sizeof(i2s_rx_buffer) / 2) {
-		// DMA is receiving to the first half of the buffer
-		// need to remove data from the second half
-		src = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2];
-		end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
-		if (AudioInputI2S::update_responsibility) AudioStream::update_all();
-	} else {
-		// DMA is receiving to the second half of the buffer
-		// need to remove data from the first half
-		src = (int16_t *)&i2s_rx_buffer[0];
-		end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2];
-	}
-	left = AudioInputI2S::block_left;
-	right = AudioInputI2S::block_right;
-	if (left != NULL && right != NULL) {
-		offset = AudioInputI2S::block_offset;
-		if (offset <= AUDIO_BLOCK_SAMPLES/2) {
-			dest_left = &(left->data[offset]);
-			dest_right = &(right->data[offset]);
-			AudioInputI2S::block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
-			do {
-				//n = *src++;
-				//*dest_left++ = (int16_t)n;
-				//*dest_right++ = (int16_t)(n >> 16);
-				*dest_left++ = *src++;
-				*dest_right++ = *src++;
-			} while (src < end);
-		}
-	}
-	//digitalWriteFast(3, LOW);
-}
-
-
-
-void AudioInputI2S::update(void)
-{
-	audio_block_t *new_left=NULL, *new_right=NULL, *out_left=NULL, *out_right=NULL;
-
-	// allocate 2 new blocks, but if one fails, allocate neither
-	new_left = allocate();
-	if (new_left != NULL) {
-		new_right = allocate();
-		if (new_right == NULL) {
-			release(new_left);
-			new_left = NULL;
-		}
-	}
-	__disable_irq();
-	if (block_offset >= AUDIO_BLOCK_SAMPLES) {
-		// the DMA filled 2 blocks, so grab them and get the
-		// 2 new blocks to the DMA, as quickly as possible
-		out_left = block_left;
-		block_left = new_left;
-		out_right = block_right;
-		block_right = new_right;
-		block_offset = 0;
-		__enable_irq();
-		// then transmit the DMA's former blocks
-		transmit(out_left, 0);
-		release(out_left);
-		transmit(out_right, 1);
-		release(out_right);
-		//Serial.print(".");
-	} else if (new_left != NULL) {
-		// the DMA didn't fill blocks, but we allocated blocks
-		if (block_left == NULL) {
-			// the DMA doesn't have any blocks to fill, so
-			// give it the ones we just allocated
-			block_left = new_left;
-			block_right = new_right;
-			block_offset = 0;
-			__enable_irq();
-		} else {
-			// the DMA already has blocks, doesn't need these
-			__enable_irq();
-			release(new_left);
-			release(new_right);
-		}
-	} else {
-		// The DMA didn't fill blocks, and we could not allocate
-		// memory... the system is likely starving for memory!
-		// Sadly, there's nothing we can do.
-		__enable_irq();
-	}
-}
-
-
-/******************************************************************/
-
-
-void AudioInputI2Sslave::begin(void)
-{
-	//block_left_1st = NULL;
-	//block_right_1st = NULL;
-
-	//pinMode(3, OUTPUT);
-	//digitalWriteFast(3, HIGH);
-	//delayMicroseconds(500);
-	//digitalWriteFast(3, LOW);
-
-	AudioOutputI2Sslave::config_i2s();
-
-	CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0
-
-	DMA_CR = 0;
-	DMA_TCD1_SADDR = &I2S0_RDR0;
-	DMA_TCD1_SOFF = 0;
-	DMA_TCD1_ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
-	DMA_TCD1_NBYTES_MLNO = 2;
-	DMA_TCD1_SLAST = 0;
-	DMA_TCD1_DADDR = i2s_rx_buffer;
-	DMA_TCD1_DOFF = 2;
-	DMA_TCD1_CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
-	DMA_TCD1_DLASTSGA = -sizeof(i2s_rx_buffer);
-	DMA_TCD1_BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2;
-	DMA_TCD1_CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
-
-	DMAMUX0_CHCFG1 = DMAMUX_DISABLE;
-	DMAMUX0_CHCFG1 = DMAMUX_SOURCE_I2S0_RX | DMAMUX_ENABLE;
-	update_responsibility = update_setup();
-	DMA_SERQ = 1;
-
-	// TODO: is I2S_RCSR_BCE appropriate if sync'd to transmitter clock?
-	//I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR;
-	I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_FRDE | I2S_RCSR_FR;
-	NVIC_ENABLE_IRQ(IRQ_DMA_CH1);
-}
-
-
-
-/******************************************************************/
-
-