8 channel I2S input for Teensy 4.0

Audio.h

 #include "input_i2s2.h"
 #include "input_i2s_quad.h"
 #include "input_i2s_hex.h"
+#include "input_i2s_oct.h"
 #include "input_tdm.h"
 #include "input_tdm2.h"
 #include "input_pdm.h"

input_i2s_oct.cpp

+/* Audio Library for Teensy 3.X
+ * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
+ *
+ * Development of this audio library was funded by PJRC.COM, LLC by sales of
+ * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop
+ * open source software by purchasing Teensy or other PJRC products.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice, development funding notice, and this permission
+ * notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <Arduino.h>
+#include "input_i2s_oct.h"
+#include "output_i2s.h"
+
+DMAMEM __attribute__((aligned(32))) static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES*4];
+audio_block_t * AudioInputI2SOct::block_ch1 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch2 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch3 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch4 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch5 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch6 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch7 = NULL;
+audio_block_t * AudioInputI2SOct::block_ch8 = NULL;
+uint16_t AudioInputI2SOct::block_offset = 0;
+bool AudioInputI2SOct::update_responsibility = false;
+DMAChannel AudioInputI2SOct::dma(false);
+
+#if defined(__IMXRT1062__)
+
+void AudioInputI2SOct::begin(void)
+{
+	dma.begin(true); // Allocate the DMA channel first
+
+	AudioOutputI2S::config_i2s();
+	I2S1_RCR3 = I2S_RCR3_RCE_4CH;
+	CORE_PIN8_CONFIG = 3;
+	CORE_PIN6_CONFIG = 3;
+	CORE_PIN9_CONFIG = 3;
+	CORE_PIN32_CONFIG = 3;
+	IOMUXC_SAI1_RX_DATA0_SELECT_INPUT = 2; // GPIO_B1_00_ALT3, pg 873
+	IOMUXC_SAI1_RX_DATA1_SELECT_INPUT = 1; // GPIO_B0_10_ALT3, pg 873
+	IOMUXC_SAI1_RX_DATA2_SELECT_INPUT = 1; // GPIO_B0_11_ALT3, pg 874
+	IOMUXC_SAI1_RX_DATA3_SELECT_INPUT = 1; // GPIO_B0_12_ALT3, pg 875
+
+	dma.TCD->SADDR = (void *)((uint32_t)&I2S1_RDR0 + 2);
+	dma.TCD->SOFF = 4;
+	dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
+	dma.TCD->NBYTES_MLOFFYES = DMA_TCD_NBYTES_SMLOE |
+		DMA_TCD_NBYTES_MLOFFYES_MLOFF(-16) |
+		DMA_TCD_NBYTES_MLOFFYES_NBYTES(8);
+	dma.TCD->SLAST = -16;
+	dma.TCD->DADDR = i2s_rx_buffer;
+	dma.TCD->DOFF = 2;
+	dma.TCD->CITER_ELINKNO = AUDIO_BLOCK_SAMPLES * 2;
+	dma.TCD->DLASTSGA = -sizeof(i2s_rx_buffer);
+	dma.TCD->BITER_ELINKNO = AUDIO_BLOCK_SAMPLES * 2;
+	dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
+	dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SAI1_RX);
+
+	I2S1_RCSR = I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR;
+	update_responsibility = update_setup();
+	dma.enable();
+	dma.attachInterrupt(isr);
+}
+
+void AudioInputI2SOct::isr(void)
+{
+	uint32_t daddr, offset;
+	const int16_t *src;
+	int16_t *dest1, *dest2, *dest3, *dest4, *dest5, *dest6, *dest7, *dest8;
+
+	//digitalWriteFast(3, HIGH);
+	daddr = (uint32_t)(dma.TCD->DADDR);
+	dma.clearInterrupt();
+
+	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 *)((uint32_t)i2s_rx_buffer + sizeof(i2s_rx_buffer) / 2);
+		if (update_responsibility) 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];
+	}
+	if (block_ch1) {
+		offset = block_offset;
+		if (offset <= AUDIO_BLOCK_SAMPLES/2) {
+			arm_dcache_delete((void *)src, sizeof(i2s_rx_buffer) / 2);
+			block_offset = offset + AUDIO_BLOCK_SAMPLES/2;
+			dest1 = &(block_ch1->data[offset]);
+			dest2 = &(block_ch2->data[offset]);
+			dest3 = &(block_ch3->data[offset]);
+			dest4 = &(block_ch4->data[offset]);
+			dest5 = &(block_ch5->data[offset]);
+			dest6 = &(block_ch6->data[offset]);
+			dest7 = &(block_ch7->data[offset]);
+			dest8 = &(block_ch8->data[offset]);
+			for (int i=0; i < AUDIO_BLOCK_SAMPLES/2; i++) {
+				*dest1++ = *src++;
+				*dest3++ = *src++;
+				*dest5++ = *src++;
+				*dest7++ = *src++;
+				*dest2++ = *src++;
+				*dest4++ = *src++;
+				*dest6++ = *src++;
+				*dest8++ = *src++;
+			}
+		}
+	}
+	//digitalWriteFast(3, LOW);
+}
+
+
+void AudioInputI2SOct::update(void)
+{
+	audio_block_t *new1, *new2, *new3, *new4, *new5, *new6, *new7, *new8;
+	audio_block_t *out1, *out2, *out3, *out4, *out5, *out6, *out7, *out8;
+
+	// allocate 8 new blocks
+	new1 = allocate();
+	new2 = allocate();
+	new3 = allocate();
+	new4 = allocate();
+	new5 = allocate();
+	new6 = allocate();
+	new7 = allocate();
+	new8 = allocate();
+	// but if any fails, allocate none
+	if (!new1 || !new2 || !new3 || !new4 || !new5 || !new6 || !new7 || !new8) {
+		if (new1) {
+			release(new1);
+			new1 = NULL;
+		}
+		if (new2) {
+			release(new2);
+			new2 = NULL;
+		}
+		if (new3) {
+			release(new3);
+			new3 = NULL;
+		}
+		if (new4) {
+			release(new4);
+			new4 = NULL;
+		}
+		if (new5) {
+			release(new5);
+			new5 = NULL;
+		}
+		if (new6) {
+			release(new6);
+			new6 = NULL;
+		}
+		if (new7) {
+			release(new7);
+			new7 = NULL;
+		}
+		if (new8) {
+			release(new8);
+			new8 = NULL;
+		}
+	}
+	__disable_irq();
+	if (block_offset >= AUDIO_BLOCK_SAMPLES) {
+		// the DMA filled 4 blocks, so grab them and get the
+		// 8 new blocks to the DMA, as quickly as possible
+		out1 = block_ch1;
+		block_ch1 = new1;
+		out2 = block_ch2;
+		block_ch2 = new2;
+		out3 = block_ch3;
+		block_ch3 = new3;
+		out4 = block_ch4;
+		block_ch4 = new4;
+		out5 = block_ch5;
+		block_ch5 = new5;
+		out6 = block_ch6;
+		block_ch6 = new6;
+		out7 = block_ch7;
+		block_ch7 = new7;
+		out8 = block_ch8;
+		block_ch8 = new8;
+		block_offset = 0;
+		__enable_irq();
+		// then transmit the DMA's former blocks
+		transmit(out1, 0);
+		release(out1);
+		transmit(out2, 1);
+		release(out2);
+		transmit(out3, 2);
+		release(out3);
+		transmit(out4, 3);
+		release(out4);
+		transmit(out5, 4);
+		release(out5);
+		transmit(out6, 5);
+		release(out6);
+		transmit(out7, 6);
+		release(out7);
+		transmit(out8, 7);
+		release(out8);
+	} else if (new1 != NULL) {
+		// the DMA didn't fill blocks, but we allocated blocks
+		if (block_ch1 == NULL) {
+			// the DMA doesn't have any blocks to fill, so
+			// give it the ones we just allocated
+			block_ch1 = new1;
+			block_ch2 = new2;
+			block_ch3 = new3;
+			block_ch4 = new4;
+			block_ch5 = new5;
+			block_ch6 = new6;
+			block_ch7 = new7;
+			block_ch8 = new8;
+			block_offset = 0;
+			__enable_irq();
+		} else {
+			// the DMA already has blocks, doesn't need these
+			__enable_irq();
+			release(new1);
+			release(new2);
+			release(new3);
+			release(new4);
+			release(new5);
+			release(new6);
+			release(new7);
+			release(new8);
+		}
+	} 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();
+	}
+}
+
+#else // not supported
+
+void AudioInputI2SOct::begin(void)
+{
+}
+
+
+
+#endif
+

input_i2s_oct.h

+/* Audio Library for Teensy 3.X
+ * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com
+ *
+ * Development of this audio library was funded by PJRC.COM, LLC by sales of
+ * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop
+ * open source software by purchasing Teensy or other PJRC products.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice, development funding notice, and this permission
+ * notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef _input_i2s_oct_h_
+#define _input_i2s_oct_h_
+
+#include "Arduino.h"
+#include "AudioStream.h"
+#include "DMAChannel.h"
+
+class AudioInputI2SOct : public AudioStream
+{
+public:
+	AudioInputI2SOct(void) : AudioStream(0, NULL) { begin(); }
+	virtual void update(void);
+	void begin(void);
+private:
+	static bool update_responsibility;
+	static DMAChannel dma;
+	static void isr(void);
+	static audio_block_t *block_ch1;
+	static audio_block_t *block_ch2;
+	static audio_block_t *block_ch3;
+	static audio_block_t *block_ch4;
+	static audio_block_t *block_ch5;
+	static audio_block_t *block_ch6;
+	static audio_block_t *block_ch7;
+	static audio_block_t *block_ch8;
+	static uint16_t block_offset;
+};
+
+
+#endif

keywords.txt

 AudioInputI2S2	KEYWORD2
 AudioInputI2SQuad	KEYWORD2
 AudioInputI2SHex	KEYWORD2
+AudioInputI2SOct	KEYWORD2
 AudioInputI2Sslave	KEYWORD2
 AudioInputTDM	KEYWORD2
 AudioInputTDM2	KEYWORD2