Begin work on quad channel audio output

Audio.h

 #include "mixer.h"
 #include "output_dac.h"
 #include "output_i2s.h"
+#include "output_i2s_quad.h"
 #include "output_pwm.h"
 #include "output_spdif.h"
 #include "play_memory.h"

keywords.txt

 AudioInputI2S	KEYWORD2
 AudioInputI2Sslave	KEYWORD2
 AudioOutputI2S	KEYWORD2
+AudioOutputI2SQuad	KEYWORD2
 AudioOutputI2Sslave	KEYWORD2
 AudioOutputSPDIF	KEYWORD2
 AudioOutputPWM	KEYWORD2

output_i2s_quad.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 "output_i2s_quad.h"
+#include "memcpy_audio.h"
+
+#if defined(__MK20DX256__)
+
+audio_block_t * AudioOutputI2SQuad::block_ch1_1st = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch2_1st = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch3_1st = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch4_1st = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch1_2nd = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch2_2nd = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch3_2nd = NULL;
+audio_block_t * AudioOutputI2SQuad::block_ch4_2nd = NULL;
+uint16_t  AudioOutputI2SQuad::ch1_offset = 0;
+uint16_t  AudioOutputI2SQuad::ch2_offset = 0;
+uint16_t  AudioOutputI2SQuad::ch3_offset = 0;
+uint16_t  AudioOutputI2SQuad::ch4_offset = 0;
+//audio_block_t * AudioOutputI2SQuad::inputQueueArray[4];
+bool AudioOutputI2SQuad::update_responsibility = false;
+DMAMEM static uint32_t i2s_tx_buffer[AUDIO_BLOCK_SAMPLES*2];
+DMAChannel AudioOutputI2SQuad::dma(false);
+
+static const uint32_t zerodata[AUDIO_BLOCK_SAMPLES/4] = {0};
+
+void AudioOutputI2SQuad::begin(void)
+{
+#if 1
+	dma.begin(true); // Allocate the DMA channel first
+
+	block_ch1_1st = NULL;
+	block_ch2_1st = NULL;
+	block_ch3_1st = NULL;
+	block_ch4_1st = NULL;
+
+	// TODO: can we call normal config_i2s, and then just enable the extra output?
+	config_i2s();
+	CORE_PIN22_CONFIG = PORT_PCR_MUX(6); // pin 22, PTC1, I2S0_TXD0 -> ch1 & ch2
+	CORE_PIN15_CONFIG = PORT_PCR_MUX(6); // pin 15, PTC0, I2S0_TXD1 -> ch3 & ch4
+
+	dma.TCD->SADDR = i2s_tx_buffer;
+	dma.TCD->SOFF = 2;
+	dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1);
+	dma.TCD->NBYTES_MLNO = DMA_TCD_NBYTES_DMLOE
+		| DMA_TCD_NBYTES_MLOFFYES_MLOFF(((int)(&I2S0_TDR0) - (int)(&I2S0_TDR1)))
+		| DMA_TCD_NBYTES_MLOFFYES_NBYTES(4);
+	dma.TCD->SLAST = -sizeof(i2s_tx_buffer);
+	dma.TCD->DADDR = &I2S0_TDR0;
+	dma.TCD->DOFF = (uint32_t)(&I2S0_TDR1) - (uint32_t)(&I2S0_TDR0);
+	dma.TCD->CITER_ELINKNO = sizeof(i2s_tx_buffer) / 4;
+	dma.TCD->DLASTSGA = 0;
+	dma.TCD->BITER_ELINKNO = sizeof(i2s_tx_buffer) / 4;
+	dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
+	dma.triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_TX);
+	update_responsibility = update_setup();
+	dma.enable();
+
+	I2S0_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE | I2S_TCSR_FR;
+	dma.attachInterrupt(isr);
+#endif
+}
+
+void AudioOutputI2SQuad::isr(void)
+{
+	uint32_t saddr;
+	const int16_t *src1, *src2, *src3, *src4;
+	const int16_t *zeros = (const int16_t *)zerodata;
+	int16_t *dest;
+
+	saddr = (uint32_t)(dma.TCD->SADDR);
+	dma.clearInterrupt();
+	if (saddr < (uint32_t)i2s_tx_buffer + sizeof(i2s_tx_buffer) / 2) {
+		// DMA is transmitting the first half of the buffer
+		// so we must fill the second half
+		dest = (int16_t *)&i2s_tx_buffer[AUDIO_BLOCK_SAMPLES/2];
+		if (update_responsibility) update_all();
+	} else {
+		dest = (int16_t *)i2s_tx_buffer;
+	}
+
+	src1 = (block_ch1_1st) ? block_ch1_1st->data + ch1_offset : zeros;
+	src2 = (block_ch2_1st) ? block_ch2_1st->data + ch2_offset : zeros;
+	src3 = (block_ch3_1st) ? block_ch3_1st->data + ch3_offset : zeros;
+	src4 = (block_ch4_1st) ? block_ch4_1st->data + ch4_offset : zeros;
+
+	// TODO: fast 4-way interleaved memcpy...
+	for (int i=0; i < AUDIO_BLOCK_SAMPLES/2; i++) {
+		*dest++ = *src1++;
+		*dest++ = *src3++;
+		*dest++ = *src2++;
+		*dest++ = *src4++;
+	}
+
+	if (block_ch1_1st) {
+		if (ch1_offset == 0) {
+			ch1_offset = AUDIO_BLOCK_SAMPLES/2;
+		} else {
+			ch1_offset = 0;
+			release(block_ch1_1st);
+			block_ch1_1st = block_ch1_2nd;
+			block_ch1_2nd = NULL;
+		}
+	}
+	if (block_ch2_1st) {
+		if (ch2_offset == 0) {
+			ch2_offset = AUDIO_BLOCK_SAMPLES/2;
+		} else {
+			ch2_offset = 0;
+			release(block_ch2_1st);
+			block_ch2_1st = block_ch2_2nd;
+			block_ch2_2nd = NULL;
+		}
+	}
+	if (block_ch3_1st) {
+		if (ch3_offset == 0) {
+			ch3_offset = AUDIO_BLOCK_SAMPLES/2;
+		} else {
+			ch3_offset = 0;
+			release(block_ch3_1st);
+			block_ch3_1st = block_ch3_2nd;
+			block_ch3_2nd = NULL;
+		}
+	}
+	if (block_ch4_1st) {
+		if (ch4_offset == 0) {
+			ch4_offset = AUDIO_BLOCK_SAMPLES/2;
+		} else {
+			ch4_offset = 0;
+			release(block_ch4_1st);
+			block_ch4_1st = block_ch4_2nd;
+			block_ch4_2nd = NULL;
+		}
+	}
+}
+
+
+void AudioOutputI2SQuad::update(void)
+{
+	audio_block_t *block, *tmp;
+
+	block = receiveReadOnly(0); // channel 1
+	if (block) {
+		__disable_irq();
+		if (block_ch1_1st == NULL) {
+			block_ch1_1st = block;
+			ch1_offset = 0;
+			__enable_irq();
+		} else if (block_ch1_2nd == NULL) {
+			block_ch1_2nd = block;
+			__enable_irq();
+		} else {
+			tmp = block_ch1_1st;
+			block_ch1_1st = block_ch1_2nd;
+			block_ch1_2nd = block;
+			ch1_offset = 0;
+			__enable_irq();
+			release(tmp);
+		}
+	}
+	block = receiveReadOnly(1); // channel 2
+	if (block) {
+		__disable_irq();
+		if (block_ch2_1st == NULL) {
+			block_ch2_1st = block;
+			ch2_offset = 0;
+			__enable_irq();
+		} else if (block_ch2_2nd == NULL) {
+			block_ch2_2nd = block;
+			__enable_irq();
+		} else {
+			tmp = block_ch2_1st;
+			block_ch2_1st = block_ch2_2nd;
+			block_ch2_2nd = block;
+			ch2_offset = 0;
+			__enable_irq();
+			release(tmp);
+		}
+	}
+	block = receiveReadOnly(2); // channel 3
+	if (block) {
+		__disable_irq();
+		if (block_ch3_1st == NULL) {
+			block_ch3_1st = block;
+			ch3_offset = 0;
+			__enable_irq();
+		} else if (block_ch3_2nd == NULL) {
+			block_ch3_2nd = block;
+			__enable_irq();
+		} else {
+			tmp = block_ch3_1st;
+			block_ch3_1st = block_ch3_2nd;
+			block_ch3_2nd = block;
+			ch3_offset = 0;
+			__enable_irq();
+			release(tmp);
+		}
+	}
+	block = receiveReadOnly(3); // channel 4
+	if (block) {
+		__disable_irq();
+		if (block_ch4_1st == NULL) {
+			block_ch4_1st = block;
+			ch4_offset = 0;
+			__enable_irq();
+		} else if (block_ch4_2nd == NULL) {
+			block_ch4_2nd = block;
+			__enable_irq();
+		} else {
+			tmp = block_ch4_1st;
+			block_ch4_1st = block_ch4_2nd;
+			block_ch4_2nd = block;
+			ch4_offset = 0;
+			__enable_irq();
+			release(tmp);
+		}
+	}
+}
+
+
+// MCLK needs to be 48e6 / 1088 * 256 = 11.29411765 MHz -> 44.117647 kHz sample rate
+//
+#if F_CPU == 96000000 || F_CPU == 48000000 || F_CPU == 24000000
+  // PLL is at 96 MHz in these modes
+  #define MCLK_MULT 2
+  #define MCLK_DIV  17
+#elif F_CPU == 72000000
+  #define MCLK_MULT 8
+  #define MCLK_DIV  51
+#elif F_CPU == 120000000
+  #define MCLK_MULT 8
+  #define MCLK_DIV  85
+#elif F_CPU == 144000000
+  #define MCLK_MULT 4
+  #define MCLK_DIV  51
+#elif F_CPU == 168000000
+  #define MCLK_MULT 8
+  #define MCLK_DIV  119
+#elif F_CPU == 16000000
+  #define MCLK_MULT 12
+  #define MCLK_DIV  17
+#else
+  #error "This CPU Clock Speed is not supported by the Audio library";
+#endif
+
+#if F_CPU >= 20000000
+  #define MCLK_SRC  3  // the PLL
+#else
+  #define MCLK_SRC  0  // system clock
+#endif
+
+void AudioOutputI2SQuad::config_i2s(void)
+{
+	SIM_SCGC6 |= SIM_SCGC6_I2S;
+	SIM_SCGC7 |= SIM_SCGC7_DMA;
+	SIM_SCGC6 |= SIM_SCGC6_DMAMUX;
+
+	// if either transmitter or receiver is enabled, do nothing
+	if (I2S0_TCSR & I2S_TCSR_TE) return;
+	if (I2S0_RCSR & I2S_RCSR_RE) return;
+
+	// enable MCLK output
+	I2S0_MCR = I2S_MCR_MICS(MCLK_SRC) | I2S_MCR_MOE;
+	I2S0_MDR = I2S_MDR_FRACT((MCLK_MULT-1)) | I2S_MDR_DIVIDE((MCLK_DIV-1));
+
+	// configure transmitter
+	I2S0_TMR = 0;
+	I2S0_TCR1 = I2S_TCR1_TFW(1);  // watermark at half fifo size
+	I2S0_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_BCP | I2S_TCR2_MSEL(1)
+		| I2S_TCR2_BCD | I2S_TCR2_DIV(3);
+	I2S0_TCR3 = I2S_TCR3_TCE_2CH;
+	I2S0_TCR4 = I2S_TCR4_FRSZ(1) | I2S_TCR4_SYWD(15) | I2S_TCR4_MF
+		| I2S_TCR4_FSE | I2S_TCR4_FSP | I2S_TCR4_FSD;
+	I2S0_TCR5 = I2S_TCR5_WNW(15) | I2S_TCR5_W0W(15) | I2S_TCR5_FBT(15);
+
+	// configure receiver (sync'd to transmitter clocks)
+	I2S0_RMR = 0;
+	I2S0_RCR1 = I2S_RCR1_RFW(1);
+	I2S0_RCR2 = I2S_RCR2_SYNC(1) | I2S_TCR2_BCP | I2S_RCR2_MSEL(1)
+		| I2S_RCR2_BCD | I2S_RCR2_DIV(3);
+	I2S0_RCR3 = I2S_RCR3_RCE_2CH;
+	I2S0_RCR4 = I2S_RCR4_FRSZ(1) | I2S_RCR4_SYWD(15) | I2S_RCR4_MF
+		| I2S_RCR4_FSE | I2S_RCR4_FSP | I2S_RCR4_FSD;
+	I2S0_RCR5 = I2S_RCR5_WNW(15) | I2S_RCR5_W0W(15) | I2S_RCR5_FBT(15);
+
+	// configure pin mux for 3 clock signals
+	CORE_PIN23_CONFIG = PORT_PCR_MUX(6); // pin 23, PTC2, I2S0_TX_FS (LRCLK)
+	CORE_PIN9_CONFIG  = PORT_PCR_MUX(6); // pin  9, PTC3, I2S0_TX_BCLK
+	CORE_PIN11_CONFIG = PORT_PCR_MUX(6); // pin 11, PTC6, I2S0_MCLK
+}
+
+
+#else // not __MK20DX256__
+
+
+void AudioOutputI2SQuad::begin(void)
+{
+}
+
+void AudioOutputI2SQuad::update(void)
+{
+	audio_block_t *block;
+
+	block = receiveReadOnly(0);
+	if (block) release(block);
+	block = receiveReadOnly(1);
+	if (block) release(block);
+	block = receiveReadOnly(2);
+	if (block) release(block);
+	block = receiveReadOnly(3);
+	if (block) release(block);
+}
+
+#endif

output_i2s_quad.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 output_i2s_quad_h_
+#define output_i2s_quad_h_
+
+#include "AudioStream.h"
+#include "DMAChannel.h"
+
+class AudioOutputI2SQuad : public AudioStream
+{
+public:
+	AudioOutputI2SQuad(void) : AudioStream(4, inputQueueArray) { begin(); }
+	virtual void update(void);
+	void begin(void);
+private:
+	static void config_i2s(void);
+	static audio_block_t *block_ch1_1st;
+	static audio_block_t *block_ch2_1st;
+	static audio_block_t *block_ch3_1st;
+	static audio_block_t *block_ch4_1st;
+	static bool update_responsibility;
+	static DMAChannel dma;
+	static void isr(void);
+	static audio_block_t *block_ch1_2nd;
+	static audio_block_t *block_ch2_2nd;
+	static audio_block_t *block_ch3_2nd;
+	static audio_block_t *block_ch4_2nd;
+	static uint16_t ch1_offset;
+	static uint16_t ch2_offset;
+	static uint16_t ch3_offset;
+	static uint16_t ch4_offset;
+	audio_block_t *inputQueueArray[4];
+};
+
+#endif