visus
/
teensy-audio
关注 1
点赞 0
派生 0
代码 工单 0 合并请求 0 版本发布 0 百科 动态
浏览代码

spdif-input

dds
Frank Bösing 5 年前
父节点
6decc27093
当前提交
c18584e13b
共有 6 个文件被更改，包括 424 次插入 和 79 次删除
分列视图 显示文件统计
  1. +1
    -0
      Audio.h
  2. +253
    -0
      input_spdif3.cpp
  3. +56
    -0
      input_spdif3.h
  4. +2
    -0
      keywords.txt
  5. +107
    -77
      output_spdif3.cpp
  6. +5
    -2
      output_spdif3.h

+ 1
- 0
Audio.h 查看文件

@@ -98,6 +98,7 @@
#include "input_tdm.h"
#include "input_tdm2.h"
#include "input_pdm.h"
#include "input_spdif3.h"
#include "mixer.h"
#include "output_dac.h"
#include "output_dacs.h"

+ 253
- 0
input_spdif3.cpp 查看文件

@@ -0,0 +1,253 @@
/* Audio Library for Teensy 3.X
* Copyright (c) 2019, 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.
*/
/*
by Frank Bösing
*/

#if defined(__IMXRT1052__) || defined(__IMXRT1062__)
#include <Arduino.h>
#include "input_spdif3.h"
#include "output_spdif3.h"
#include "utility/imxrt_hw.h"

DMAMEM __attribute__((aligned(32)))
static uint32_t spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 4];
audio_block_t * AudioInputSPDIF3::block_left = NULL;
audio_block_t * AudioInputSPDIF3::block_right = NULL;
uint16_t AudioInputSPDIF3::block_offset = 0;
bool AudioInputSPDIF3::update_responsibility = false;
DMAChannel AudioInputSPDIF3::dma(false);

FLASHMEM
void AudioInputSPDIF3::begin(void)
{
dma.begin(true); // Allocate the DMA channel first

AudioOutputSPDIF3::config_spdif3();

const int nbytes_mlno = 2 * 4; // 8 Bytes per minor loop
dma.TCD->SADDR = &SPDIF_SRL;
dma.TCD->SOFF = 4;
dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(2) | DMA_TCD_ATTR_DSIZE(2);
dma.TCD->NBYTES_MLNO = DMA_TCD_NBYTES_MLOFFYES_NBYTES(nbytes_mlno) | DMA_TCD_NBYTES_SMLOE |
DMA_TCD_NBYTES_MLOFFYES_MLOFF(-8);
dma.TCD->SLAST = -8;
dma.TCD->DADDR = spdif_rx_buffer;
dma.TCD->DOFF = 4;
dma.TCD->DLASTSGA = -sizeof(spdif_rx_buffer);
dma.TCD->CITER_ELINKNO = sizeof(spdif_rx_buffer) / nbytes_mlno;
dma.TCD->BITER_ELINKNO = sizeof(spdif_rx_buffer) / nbytes_mlno;
dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;

dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SPDIF_RX);
update_responsibility = update_setup();
dma.attachInterrupt(isr);
dma.enable();

SPDIF_SRCD = 0;
SPDIF_SCR |= SPDIF_SCR_DMA_RX_EN;
CORE_PIN15_CONFIG = 3;
IOMUXC_SPDIF_IN_SELECT_INPUT = 0; // GPIO_AD_B1_03_ALT3
//pinMode(13, OUTPUT);
}

void AudioInputSPDIF3::isr(void)
{
uint32_t daddr, offset;
const int32_t *src, *end;
int16_t *dest_left, *dest_right;
audio_block_t *left, *right;

dma.clearInterrupt();
//digitalWriteFast(13, !digitalReadFast(13));
if (AudioInputSPDIF3::update_responsibility) AudioStream::update_all();

daddr = (uint32_t)(dma.TCD->DADDR);

if (daddr < (uint32_t)spdif_rx_buffer + sizeof(spdif_rx_buffer) / 2) {
// DMA is receiving to the first half of the buffer
// need to remove data from the second half
src = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 2];
end = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 4];
} else {
// DMA is receiving to the second half of the buffer
// need to remove data from the first half
src = (int32_t *)&spdif_rx_buffer[0];
end = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES*2];
}

left = AudioInputSPDIF3::block_left;
right = AudioInputSPDIF3::block_right;

if (left != NULL && right != NULL) {
offset = AudioInputSPDIF3::block_offset;
if (offset <= AUDIO_BLOCK_SAMPLES*2) {
dest_left = &(left->data[offset]);
dest_right = &(right->data[offset]);
AudioInputSPDIF3::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;

do {
#if IMXRT_CACHE_ENABLED >=1
SCB_CACHE_DCIMVAC = (uintptr_t)src;
asm("dsb":::"memory");
#endif

*dest_left++ = (*src++) >> 8;
*dest_right++ = (*src++) >> 8;

*dest_left++ = (*src++) >> 8;
*dest_right++ = (*src++) >> 8;

*dest_left++ = (*src++) >> 8;
*dest_right++ = (*src++) >> 8;

*dest_left++ = (*src++) >> 8;
*dest_right++ = (*src++) >> 8;

} while (src < end);
}
}
else if (left != NULL) {
offset = AudioInputSPDIF3::block_offset;
if (offset <= AUDIO_BLOCK_SAMPLES*2) {
dest_left = &(left->data[offset]);
AudioInputSPDIF3::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;

do {
#if IMXRT_CACHE_ENABLED >=1
SCB_CACHE_DCIMVAC = (uintptr_t)src;
asm("dsb":::"memory");
#endif

*dest_left++ = (*src++) >> 8;
src++;

*dest_left++ = (*src++) >> 8;
src++;

*dest_left++ = (*src++) >> 8;
src++;

*dest_left++ = (*src++) >> 8;
src++;

} while (src < end);
}
}
else if (right != NULL) {
offset = AudioInputSPDIF3::block_offset;
if (offset <= AUDIO_BLOCK_SAMPLES*2) {
dest_right = &(right->data[offset]);
AudioInputSPDIF3::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;

do {
#if IMXRT_CACHE_ENABLED >=1
SCB_CACHE_DCIMVAC = (uintptr_t)src;
asm("dsb":::"memory");
#endif

src++;
*dest_right++ = (*src++) >> 8;

src++;
*dest_right++ = (*src++) >> 8;

src++;
*dest_right++ = (*src++) >> 8;

src++;
*dest_right++ = (*src++) >> 8;

} while (src < end);
}
}

}


void AudioInputSPDIF3::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();
}
}

bool AudioInputSPDIF3::pllLocked(void)
{
return (SPDIF_SRPC & SPDIF_SRPC_LOCK) == SPDIF_SRPC_LOCK ? true:false;
}

unsigned int AudioInputSPDIF3::sampleRate(void) {
if (!pllLocked()) return 0;
return (float)((uint64_t)F_BUS_ACTUAL * SPDIF_SRFM) / (0x8000000ULL * AudioOutputSPDIF3::dpll_Gain()) + 0.5F;
}

#endif

+ 56
- 0
input_spdif3.h 查看文件

@@ -0,0 +1,56 @@
/* Audio Library for Teensy 3.X
* Copyright (c) 2019, 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.
*/
// Frank Bösing

#if defined(__IMXRT1052__) || defined(__IMXRT1062__)
#ifndef _input_spdif3_h_
#define _input_spdif3_h_

#include "Arduino.h"
#include "AudioStream.h"
#include "DMAChannel.h"

class AudioInputSPDIF3 : public AudioStream
{
public:
AudioInputSPDIF3(void) : AudioStream(0, NULL) { begin(); }
virtual void update(void);
void begin(void);
static bool pllLocked(void);
static unsigned int sampleRate(void);
protected:
//AudioInputSPDIF3(int dummy): AudioStream(0, NULL) {} // to be used only inside AudioInputSPDIF3slave !!
static bool update_responsibility;
static DMAChannel dma;
static void isr(void);
private:
static audio_block_t *block_left;
static audio_block_t *block_right;
static uint16_t block_offset;
};

#endif
#endif

+ 2
- 0
keywords.txt 查看文件

@@ -10,6 +10,7 @@ AudioInputTDM KEYWORD2
AudioInputTDM2 KEYWORD2
AudioInputPDM KEYWORD2
AudioInputUSB KEYWORD2
AudioInputSPDIF3 KEYWORD2
AudioOutputI2S KEYWORD2
AudioOutputI2S2 KEYWORD2
AudioOutputI2SQuad KEYWORD2
@@ -107,6 +108,7 @@ setHighShelf KEYWORD2
muteOutput KEYWORD2
unmuteOutput KEYWORD2
muteInput KEYWORD2
pllLocked KEYWORD2
unmuteInput KEYWORD2
enableDither KEYWORD2
disableDither KEYWORD2

+ 107
- 77
output_spdif3.cpp 查看文件

@@ -45,7 +45,19 @@ static int32_t SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4];
DMAMEM __attribute__((aligned(32)))
audio_block_t AudioOutputSPDIF3::block_silent;

PROGMEM
#define SPDIF_DPLL_GAIN24 0
#define SPDIF_DPLL_GAIN16 1
#define SPDIF_DPLL_GAIN12 2
#define SPDIF_DPLL_GAIN8 3
#define SPDIF_DPLL_GAIN6 4
#define SPDIF_DPLL_GAIN4 5
#define SPDIF_DPLL_GAIN3 6
#define SPDIF_DPLL_GAIN1 7

#define SPDIF_DPLL_GAIN SPDIF_DPLL_GAIN8 //Actual Gain
static const uint8_t spdif_gain[8] = {24, 16, 12, 8, 6, 4, 3, 1};

FLASHMEM
void AudioOutputSPDIF3::begin(void)
{

@@ -54,86 +66,32 @@ void AudioOutputSPDIF3::begin(void)
block_left_1st = nullptr;
block_right_1st = nullptr;
memset(&block_silent, 0, sizeof(block_silent));
uint32_t fs = AUDIO_SAMPLE_RATE_EXACT;
// PLL between 27*24 = 648MHz und 54*24=1296MHz
// n1, n2 choosen for compatibility with I2S (same PLL frequency) :
int n1 = 4; //SAI prescaler 4 => (n1*n2) = multiple of 4
int n2 = 1 + (24000000 * 27) / (fs * 256 * n1);
double C = ((double)fs * 256 * n1 * n2) / 24000000;
int c0 = C;
int c2 = 10000;
int c1 = C * c2 - (c0 * c2);
set_audioClock(c0, c1, c2);

double pllclock = (c0 + (double)c1 / c2) * 24000000; //677376000 Hz

//use new pred/podf values
n1 = 7; //0: divide by 1 (do not use with high input frequencies), 1:/2, 2: /3, 7:/8
n2 = 0; //0: divide by 1, 7: divide by 8

uint32_t clock = pllclock / (1 + n1) / (1 + n2);
uint32_t clkdiv = clock / (fs * 64); // 1 .. 128
uint32_t mod = clock % (fs * 64);
if (mod > ((fs * 64) / 2)) clkdiv += 1; //nearest divider

CCM_CCGR5 &= ~CCM_CCGR5_SPDIF(CCM_CCGR_ON); //Clock gate off

CCM_CDCDR = (CCM_CDCDR & ~(CCM_CDCDR_SPDIF0_CLK_SEL_MASK | CCM_CDCDR_SPDIF0_CLK_PRED_MASK | CCM_CDCDR_SPDIF0_CLK_PODF_MASK))
| CCM_CDCDR_SPDIF0_CLK_SEL(0) // 0 PLL4, 1 PLL3 PFD2, 2 PLL5, 3 pll3_sw_clk
| CCM_CDCDR_SPDIF0_CLK_PRED(n1)
| CCM_CDCDR_SPDIF0_CLK_PODF(n2);

CCM_CCGR5 |= CCM_CCGR5_SPDIF(CCM_CCGR_ON); //Clock gate on

if ((SPDIF_SCR & 0x400) != 0) { //If default value:
SPDIF_SCR = SPDIF_SCR_SOFT_RESET; //Reset SPDIF
while (SPDIF_SCR & SPDIF_SCR_SOFT_RESET) {;} //Wait for Reset (takes 8 cycles)
SPDIF_SCR = 0;
}

SPDIF_SCR |=
SPDIF_SCR_RXFIFOFULL_SEL(0) |// Full interrupt if at least 1 sample in Rx left and right FIFOs
SPDIF_SCR_RXAUTOSYNC |
SPDIF_SCR_TXAUTOSYNC |
SPDIF_SCR_TXFIFOEMPTY_SEL(3) | // Empty interrupt if at most 4 sample in Tx left and right FIFOs
SPDIF_SCR_TXFIFO_CTRL(1) | // 0:Send zeros 1: normal operation
SPDIF_SCR_DMA_TX_EN |
//SPDIF_SCR_VALCTRL | // Outgoing Validity always clear
SPDIF_SCR_TXSEL(5) | //0:off and output 0, 1:Feed-though SPDIFIN, 5:Tx Normal operation
SPDIF_SCR_USRC_SEL(3); // No embedded U channel
SPDIF_SRCD = 0;
SPDIF_STCSCH = 0;
SPDIF_STCSCL = 0;
SPDIF_SRCD = 0;

SPDIF_STC = SPDIF_STC_TXCLK_SOURCE(1) //tx_clk input (from SPDIF0_CLK_ROOT)
| SPDIF_STC_SYSCLK_DF(0)
| SPDIF_STC_TXCLK_DF(clkdiv - 1);

config_spdif3();
const int nbytes_mlno = 2 * 4; // 8 Bytes per minor loop

dma.TCD->SADDR = SPDIF_tx_buffer;
dma.TCD->SOFF = 4;
dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(2) | DMA_TCD_ATTR_DSIZE(2);
dma.TCD->NBYTES_MLNO = DMA_TCD_NBYTES_MLOFFYES_NBYTES(nbytes_mlno) | DMA_TCD_NBYTES_DMLOE |
dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(2) | DMA_TCD_ATTR_DSIZE(2);
dma.TCD->NBYTES_MLNO = DMA_TCD_NBYTES_MLOFFYES_NBYTES(nbytes_mlno) | DMA_TCD_NBYTES_DMLOE |
DMA_TCD_NBYTES_MLOFFYES_MLOFF(-8);
dma.TCD->SLAST = -sizeof(SPDIF_tx_buffer);
dma.TCD->DADDR = &SPDIF_STL;
dma.TCD->DOFF = 4;
dma.TCD->DLASTSGA = -8;
//dma.TCD->ATTR_DST = ((31 - __builtin_clz(8)) << 3);
dma.TCD->CITER_ELINKNO = sizeof(SPDIF_tx_buffer) / nbytes_mlno;
dma.TCD->CITER_ELINKNO = sizeof(SPDIF_tx_buffer) / nbytes_mlno;
dma.TCD->BITER_ELINKNO = sizeof(SPDIF_tx_buffer) / nbytes_mlno;
dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;

dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SPDIF_TX);

update_responsibility = update_setup();
update_responsibility = update_setup();
dma.enable();
dma.attachInterrupt(isr);
dma.attachInterrupt(isr);

CORE_PIN14_CONFIG = 3; //3:SPDIF_OUT
SPDIF_SCR |= SPDIF_SCR_DMA_TX_EN;
SPDIF_STC |= SPDIF_STC_TX_ALL_CLK_EN;
// pinMode(13, OUTPUT);
}
@@ -167,40 +125,40 @@ void AudioOutputSPDIF3::isr(void)

src_left = (const int16_t *)(block_left->data);
src_right = (const int16_t *)(block_right->data);
do {
#if IMXRT_CACHE_ENABLED >= 2
SCB_CACHE_DCCIMVAC = (uintptr_t) dest;
asm volatile("dsb");
#endif
*dest++ = (*src_left++) << 8;
*dest++ = (*src_right++) << 8;

*dest++ = (*src_left++) << 8;
*dest++ = (*src_right++) << 8;
*dest++ = (*src_left++) << 8;
*dest++ = (*src_right++) << 8;

*dest++ = (*src_left++) << 8;
*dest++ = (*src_right++) << 8;
#if IMXRT_CACHE_ENABLED >= 2
SCB_CACHE_DCCIMVAC = (uint32_t) dest - 32;
#endif

} while (dest < end);

if (block_left != &block_silent) {
release(block_left);
release(block_left);
block_left_1st = block_left_2nd;
block_left_2nd = nullptr;
}
if (block_right != &block_silent) {
release(block_right);
release(block_right);
block_right_1st = block_right_2nd;
block_right_2nd = nullptr;
}

if (update_responsibility) update_all();
//digitalWriteFast(13,!digitalReadFast(13));
//digitalWriteFast(13,!digitalReadFast(13));
}

void AudioOutputSPDIF3::update(void)
@@ -240,10 +198,10 @@ void AudioOutputSPDIF3::update(void)
}
__enable_irq();
if (block_left) {
release(block_left);
release(block_left);
}
if (block_right) {
release(block_right);
if (block_right) {
release(block_right);
}

}
@@ -251,8 +209,80 @@ void AudioOutputSPDIF3::update(void)
void AudioOutputSPDIF3::mute_PCM(const bool mute)
{
if (mute)
SPDIF_SCR |= SPDIF_SCR_VALCTRL;
SPDIF_SCR |= SPDIF_SCR_VALCTRL;
else
SPDIF_SCR &= ~SPDIF_SCR_VALCTRL;
}

uint32_t AudioOutputSPDIF3::dpll_Gain(void)
{
return spdif_gain[SPDIF_DPLL_GAIN];
}

PROGMEM
void AudioOutputSPDIF3::config_spdif3(void)
{
delay(1); //WHY IS THIS NEEDED?

uint32_t fs = AUDIO_SAMPLE_RATE_EXACT;
// PLL between 27*24 = 648MHz und 54*24=1296MHz
// n1, n2 choosen for compatibility with I2S (same PLL frequency) :
int n1 = 4; //SAI prescaler 4 => (n1*n2) = multiple of 4
int n2 = 1 + (24000000 * 27) / (fs * 256 * n1);
double C = ((double)fs * 256 * n1 * n2) / 24000000;
int c0 = C;
int c2 = 10000;
int c1 = C * c2 - (c0 * c2);
set_audioClock(c0, c1, c2);

//use new pred/podf values
n1 = 7; //0: divide by 1 (do not use with high input frequencies), 1:/2, 2: /3, 7:/8
n2 = 0; //0: divide by 1, 7: divide by 8

CCM_CCGR5 &= ~CCM_CCGR5_SPDIF(CCM_CCGR_ON); //Clock gate off

CCM_CDCDR = (CCM_CDCDR & ~(CCM_CDCDR_SPDIF0_CLK_SEL_MASK | CCM_CDCDR_SPDIF0_CLK_PRED_MASK | CCM_CDCDR_SPDIF0_CLK_PODF_MASK))
| CCM_CDCDR_SPDIF0_CLK_SEL(0) // 0 PLL4, 1 PLL3 PFD2, 2 PLL5, 3 pll3_sw_clk
| CCM_CDCDR_SPDIF0_CLK_PRED(n1)
| CCM_CDCDR_SPDIF0_CLK_PODF(n2);

CCM_CCGR5 |= CCM_CCGR5_SPDIF(CCM_CCGR_ON); //Clock gate on

if (!(SPDIF_SCR & (SPDIF_SCR_DMA_RX_EN | SPDIF_SCR_DMA_TX_EN))) {
//Serial.print("Reset SPDIF3");
SPDIF_SCR = SPDIF_SCR_SOFT_RESET; //Reset SPDIF
while (SPDIF_SCR & SPDIF_SCR_SOFT_RESET) {;} //Wait for Reset (takes 8 cycles)
} else return;

SPDIF_SCR =
SPDIF_SCR_RXFIFOFULL_SEL(0) | // Full interrupt if at least 1 sample in Rx left and right FIFOs
SPDIF_SCR_RXAUTOSYNC |
SPDIF_SCR_TXAUTOSYNC |
SPDIF_SCR_TXFIFOEMPTY_SEL(2) | // Empty interrupt if at most 8 samples in Tx left and right FIFOs
SPDIF_SCR_TXFIFO_CTRL(1) | // 0:Send zeros 1: normal operation
SPDIF_SCR_VALCTRL | // Outgoing Validity always clear
SPDIF_SCR_TXSEL(5) | // 0:off and output 0, 1:Feed-though SPDIFIN, 5:Tx Normal operation
SPDIF_SCR_USRC_SEL(3);

SPDIF_SRPC =
SPDIF_SRPC_CLKSRC_SEL(1) | //if (DPLL Locked) SPDIF_RxClk else tx_clk (SPDIF0_CLK_ROOT)
SPDIF_SRPC_GAINSEL(SPDIF_DPLL_GAIN);

uint32_t pllclock = (c0 + (float)c1 / c2) * 24000000ULL; //677376000 Hz
uint32_t clock = pllclock / (1 + n1) / (1 + n2);
uint32_t clkdiv = clock / (fs * 64); // 1 .. 128
uint32_t mod = clock % (fs * 64);
if (mod > ((fs * 64) / 2)) clkdiv += 1; //nearest divider

#if 0
Serial.printf("PLL: %d\n", pllclock);
Serial.printf("clock: %d\n", clock);
Serial.printf("clkdiv: %d\n", clkdiv);
#endif

SPDIF_STC =
SPDIF_STC_TXCLK_SOURCE(1) | //tx_clk input (from SPDIF0_CLK_ROOT)
SPDIF_STC_TXCLK_DF(clkdiv - 1);
}

#endif

+ 5
- 2
output_spdif3.h 查看文件

@@ -33,16 +33,19 @@ public:
AudioOutputSPDIF3(void) : AudioStream(2, inputQueueArray) { begin(); }
virtual void update(void);
void begin(void);
//friend class AudioInputSPDIF;
friend class AudioInputSPDIF3;
static void mute_PCM(const bool mute);
static bool pll_locked(void);
protected:
//AudioOutputSPDIF3(int dummy): AudioStream(2, inputQueueArray) {}
static void config_spdif3(void);
static audio_block_t *block_left_1st;
static audio_block_t *block_right_1st;
static bool update_responsibility;
static DMAChannel dma;
static void isr(void);
static void isr(void);
private:
static uint32_t dpll_Gain() __attribute__ ((const));
static audio_block_t *block_left_2nd;
static audio_block_t *block_right_2nd;
static audio_block_t block_silent;

撰写 预览
正在加载...
取消
保存