|
|
|
@@ -0,0 +1,346 @@ |
|
|
|
/* SPDIF for Teensy 3.X |
|
|
|
* Copyright (c) 2015, Frank Bösing, f.boesing@gmx.de, |
|
|
|
* Thanks to KPC & Paul Stoffregen! |
|
|
|
* |
|
|
|
* 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_spdif.h" |
|
|
|
|
|
|
|
audio_block_t * AudioOutputSPDIF::block_left_1st = NULL; |
|
|
|
audio_block_t * AudioOutputSPDIF::block_right_1st = NULL; |
|
|
|
audio_block_t * AudioOutputSPDIF::block_left_2nd = NULL; |
|
|
|
audio_block_t * AudioOutputSPDIF::block_right_2nd = NULL; |
|
|
|
uint16_t AudioOutputSPDIF::block_left_offset = 0; |
|
|
|
uint16_t AudioOutputSPDIF::block_right_offset = 0; |
|
|
|
bool AudioOutputSPDIF::update_responsibility = false; |
|
|
|
|
|
|
|
DMAMEM static uint32_t SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4]; //2 KB |
|
|
|
|
|
|
|
DMAChannel AudioOutputSPDIF::dma(false); |
|
|
|
|
|
|
|
static const |
|
|
|
uint16_t bmclookup[256] = { //biphase mark encoded values (least significant bit first) |
|
|
|
0xcccc, 0x4ccc, 0x2ccc, 0xaccc, 0x34cc, 0xb4cc, 0xd4cc, 0x54cc, |
|
|
|
0x32cc, 0xb2cc, 0xd2cc, 0x52cc, 0xcacc, 0x4acc, 0x2acc, 0xaacc, |
|
|
|
0x334c, 0xb34c, 0xd34c, 0x534c, 0xcb4c, 0x4b4c, 0x2b4c, 0xab4c, |
|
|
|
0xcd4c, 0x4d4c, 0x2d4c, 0xad4c, 0x354c, 0xb54c, 0xd54c, 0x554c, |
|
|
|
0x332c, 0xb32c, 0xd32c, 0x532c, 0xcb2c, 0x4b2c, 0x2b2c, 0xab2c, |
|
|
|
0xcd2c, 0x4d2c, 0x2d2c, 0xad2c, 0x352c, 0xb52c, 0xd52c, 0x552c, |
|
|
|
0xccac, 0x4cac, 0x2cac, 0xacac, 0x34ac, 0xb4ac, 0xd4ac, 0x54ac, |
|
|
|
0x32ac, 0xb2ac, 0xd2ac, 0x52ac, 0xcaac, 0x4aac, 0x2aac, 0xaaac, |
|
|
|
0x3334, 0xb334, 0xd334, 0x5334, 0xcb34, 0x4b34, 0x2b34, 0xab34, |
|
|
|
0xcd34, 0x4d34, 0x2d34, 0xad34, 0x3534, 0xb534, 0xd534, 0x5534, |
|
|
|
0xccb4, 0x4cb4, 0x2cb4, 0xacb4, 0x34b4, 0xb4b4, 0xd4b4, 0x54b4, |
|
|
|
0x32b4, 0xb2b4, 0xd2b4, 0x52b4, 0xcab4, 0x4ab4, 0x2ab4, 0xaab4, |
|
|
|
0xccd4, 0x4cd4, 0x2cd4, 0xacd4, 0x34d4, 0xb4d4, 0xd4d4, 0x54d4, |
|
|
|
0x32d4, 0xb2d4, 0xd2d4, 0x52d4, 0xcad4, 0x4ad4, 0x2ad4, 0xaad4, |
|
|
|
0x3354, 0xb354, 0xd354, 0x5354, 0xcb54, 0x4b54, 0x2b54, 0xab54, |
|
|
|
0xcd54, 0x4d54, 0x2d54, 0xad54, 0x3554, 0xb554, 0xd554, 0x5554, |
|
|
|
0x3332, 0xb332, 0xd332, 0x5332, 0xcb32, 0x4b32, 0x2b32, 0xab32, |
|
|
|
0xcd32, 0x4d32, 0x2d32, 0xad32, 0x3532, 0xb532, 0xd532, 0x5532, |
|
|
|
0xccb2, 0x4cb2, 0x2cb2, 0xacb2, 0x34b2, 0xb4b2, 0xd4b2, 0x54b2, |
|
|
|
0x32b2, 0xb2b2, 0xd2b2, 0x52b2, 0xcab2, 0x4ab2, 0x2ab2, 0xaab2, |
|
|
|
0xccd2, 0x4cd2, 0x2cd2, 0xacd2, 0x34d2, 0xb4d2, 0xd4d2, 0x54d2, |
|
|
|
0x32d2, 0xb2d2, 0xd2d2, 0x52d2, 0xcad2, 0x4ad2, 0x2ad2, 0xaad2, |
|
|
|
0x3352, 0xb352, 0xd352, 0x5352, 0xcb52, 0x4b52, 0x2b52, 0xab52, |
|
|
|
0xcd52, 0x4d52, 0x2d52, 0xad52, 0x3552, 0xb552, 0xd552, 0x5552, |
|
|
|
0xccca, 0x4cca, 0x2cca, 0xacca, 0x34ca, 0xb4ca, 0xd4ca, 0x54ca, |
|
|
|
0x32ca, 0xb2ca, 0xd2ca, 0x52ca, 0xcaca, 0x4aca, 0x2aca, 0xaaca, |
|
|
|
0x334a, 0xb34a, 0xd34a, 0x534a, 0xcb4a, 0x4b4a, 0x2b4a, 0xab4a, |
|
|
|
0xcd4a, 0x4d4a, 0x2d4a, 0xad4a, 0x354a, 0xb54a, 0xd54a, 0x554a, |
|
|
|
0x332a, 0xb32a, 0xd32a, 0x532a, 0xcb2a, 0x4b2a, 0x2b2a, 0xab2a, |
|
|
|
0xcd2a, 0x4d2a, 0x2d2a, 0xad2a, 0x352a, 0xb52a, 0xd52a, 0x552a, |
|
|
|
0xccaa, 0x4caa, 0x2caa, 0xacaa, 0x34aa, 0xb4aa, 0xd4aa, 0x54aa, |
|
|
|
0x32aa, 0xb2aa, 0xd2aa, 0x52aa, 0xcaaa, 0x4aaa, 0x2aaa, 0xaaaa |
|
|
|
}; |
|
|
|
|
|
|
|
#define PREAMBLE_B (0xE8) //11101000 |
|
|
|
#define PREAMBLE_M (0xE2) //11100010 |
|
|
|
#define PREAMBLE_W (0xE4) //11100100 |
|
|
|
|
|
|
|
void AudioOutputSPDIF::begin(void) |
|
|
|
{ |
|
|
|
|
|
|
|
dma.begin(true); // Allocate the DMA channel first |
|
|
|
|
|
|
|
block_left_1st = NULL; |
|
|
|
block_right_1st = NULL; |
|
|
|
|
|
|
|
// TODO: should we set & clear the I2S_TCSR_SR bit here? |
|
|
|
config_SPDIF(); |
|
|
|
CORE_PIN22_CONFIG = PORT_PCR_MUX(6); // pin 22, PTC1, I2S0_TXD0 |
|
|
|
|
|
|
|
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 = nbytes_mlno; |
|
|
|
dma.TCD->SLAST = -sizeof(SPDIF_tx_buffer); |
|
|
|
dma.TCD->DADDR = &I2S0_TDR0; |
|
|
|
dma.TCD->DOFF = 0; |
|
|
|
dma.TCD->CITER_ELINKNO = sizeof(SPDIF_tx_buffer) / nbytes_mlno; |
|
|
|
dma.TCD->DLASTSGA = 0; |
|
|
|
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_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); |
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
/* |
|
|
|
|
|
|
|
http://www.hardwarebook.info/S/PDIF |
|
|
|
|
|
|
|
1. To make it easier and a bit faster, the parity-bit is always the same. |
|
|
|
- With a alternating parity we had to adjust the next subframe. Instead, use a bit from the aux-info as parity. |
|
|
|
|
|
|
|
2. The buffer is filled with an offset of 1 byte, so the last parity (which is always 0 now (see 1.) ) is written as first byte. |
|
|
|
-> A bit easier and faster to construct both subframes. |
|
|
|
|
|
|
|
*/ |
|
|
|
|
|
|
|
void AudioOutputSPDIF::isr(void) |
|
|
|
{ |
|
|
|
static uint16_t frame = 0; |
|
|
|
const int16_t *src; |
|
|
|
int32_t *end, *dest; |
|
|
|
audio_block_t *block; |
|
|
|
uint32_t saddr, offset; |
|
|
|
uint16_t sample, lo, hi, aux; |
|
|
|
|
|
|
|
saddr = (uint32_t)(dma.TCD->SADDR); |
|
|
|
dma.clearInterrupt(); |
|
|
|
if (saddr < (uint32_t)SPDIF_tx_buffer + sizeof(SPDIF_tx_buffer) / 2) { |
|
|
|
// DMA is transmitting the first half of the buffer |
|
|
|
// so we must fill the second half |
|
|
|
dest = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4/2]; |
|
|
|
end = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4]; |
|
|
|
if (AudioOutputSPDIF::update_responsibility) AudioStream::update_all(); |
|
|
|
} else { |
|
|
|
// DMA is transmitting the second half of the buffer |
|
|
|
// so we must fill the first half |
|
|
|
dest = (int32_t *)SPDIF_tx_buffer; |
|
|
|
end = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4/2]; |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
block = AudioOutputSPDIF::block_left_1st; |
|
|
|
if (block) { |
|
|
|
offset = AudioOutputSPDIF::block_left_offset; |
|
|
|
src = &block->data[offset]; |
|
|
|
do { |
|
|
|
|
|
|
|
sample = *src++; |
|
|
|
|
|
|
|
//Subframe Channel 1 |
|
|
|
hi = bmclookup[(uint8_t)(sample >> 8)]; |
|
|
|
lo = bmclookup[(uint8_t) sample]; |
|
|
|
lo ^= (~((int16_t)hi) >> 16); |
|
|
|
// 16 Bit sample: |
|
|
|
*(dest+1) = ((uint32_t)lo << 16) | hi; |
|
|
|
// 4 Bit Auxillary-audio-databits, the first used as parity |
|
|
|
aux = (0xB333 ^ (((uint32_t)((int16_t)lo)) >> 17)); |
|
|
|
|
|
|
|
if (++frame > 191) { |
|
|
|
// VUCP-Bits ("Valid, Subcode, Channelstatus, Parity) = 0 (0xcc) | Preamble (depends on Framno.) | Auxillary |
|
|
|
*(dest+0) = 0xcc000000 | (PREAMBLE_B << 16 ) | aux; //special preamble for one of 192 frames |
|
|
|
frame = 0; |
|
|
|
} else { |
|
|
|
*(dest+0) = 0xcc000000 | (PREAMBLE_M << 16 ) | aux; |
|
|
|
} |
|
|
|
dest += 4; |
|
|
|
|
|
|
|
} while (dest < end); |
|
|
|
offset += AUDIO_BLOCK_SAMPLES/2; |
|
|
|
if (offset < AUDIO_BLOCK_SAMPLES) { |
|
|
|
AudioOutputSPDIF::block_left_offset = offset; |
|
|
|
} else { |
|
|
|
AudioOutputSPDIF::block_left_offset = 0; |
|
|
|
AudioStream::release(block); |
|
|
|
AudioOutputSPDIF::block_left_1st = AudioOutputSPDIF::block_left_2nd; |
|
|
|
AudioOutputSPDIF::block_left_2nd = NULL; |
|
|
|
} |
|
|
|
} else { |
|
|
|
do { |
|
|
|
if ( ++frame > 191 ) { |
|
|
|
*(dest+0) = 0xcce8cccc; |
|
|
|
frame = 0; |
|
|
|
} else { |
|
|
|
*(dest+0) = 0xcce2cccc; |
|
|
|
} |
|
|
|
*(dest+1) = 0xccccccccUL; |
|
|
|
|
|
|
|
dest +=4; |
|
|
|
} while (dest < end); |
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
dest -= AUDIO_BLOCK_SAMPLES * 4/2 - 4/2; |
|
|
|
block = AudioOutputSPDIF::block_right_1st; |
|
|
|
if (block) { |
|
|
|
offset = AudioOutputSPDIF::block_right_offset; |
|
|
|
src = &block->data[offset]; |
|
|
|
|
|
|
|
do { |
|
|
|
sample = *src++; |
|
|
|
|
|
|
|
//Subframe Channel 2 |
|
|
|
hi = bmclookup[(uint8_t)(sample >> 8)]; |
|
|
|
lo = bmclookup[(uint8_t)sample]; |
|
|
|
lo ^= (~((int16_t)hi) >> 16); |
|
|
|
|
|
|
|
*(dest+1) = ( ((uint32_t)lo << 16) | hi ); |
|
|
|
|
|
|
|
aux = (0xB333 ^ (((uint32_t)((int16_t)lo)) >> 17)); |
|
|
|
*(dest+0) = 0xcc000000 | (PREAMBLE_W << 16 ) | aux; |
|
|
|
|
|
|
|
dest += 4; |
|
|
|
} while (dest < end); |
|
|
|
|
|
|
|
offset += AUDIO_BLOCK_SAMPLES/2; |
|
|
|
if (offset < AUDIO_BLOCK_SAMPLES) { |
|
|
|
AudioOutputSPDIF::block_right_offset = offset; |
|
|
|
} else { |
|
|
|
AudioOutputSPDIF::block_right_offset = 0; |
|
|
|
AudioStream::release(block); |
|
|
|
AudioOutputSPDIF::block_right_1st = AudioOutputSPDIF::block_right_2nd; |
|
|
|
AudioOutputSPDIF::block_right_2nd = NULL; |
|
|
|
} |
|
|
|
} else { |
|
|
|
do { |
|
|
|
*dest = 0xcce4ccccUL; |
|
|
|
*(dest+1) = 0xccccccccUL; |
|
|
|
dest += 4 ; |
|
|
|
} while (dest < end); |
|
|
|
} |
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
void AudioOutputSPDIF::update(void) |
|
|
|
{ |
|
|
|
|
|
|
|
audio_block_t *block; |
|
|
|
block = receiveReadOnly(0); // input 0 = left channel |
|
|
|
if (block) { |
|
|
|
|
|
|
|
__disable_irq(); |
|
|
|
if (block_left_1st == NULL) { |
|
|
|
block_left_1st = block; |
|
|
|
block_left_offset = 0; |
|
|
|
__enable_irq(); |
|
|
|
} else if (block_left_2nd == NULL) { |
|
|
|
block_left_2nd = block; |
|
|
|
__enable_irq(); |
|
|
|
} else { |
|
|
|
audio_block_t *tmp = block_left_1st; |
|
|
|
block_left_1st = block_left_2nd; |
|
|
|
block_left_2nd = block; |
|
|
|
block_left_offset = 0; |
|
|
|
__enable_irq(); |
|
|
|
release(tmp); |
|
|
|
} |
|
|
|
} |
|
|
|
block = receiveReadOnly(1); // input 1 = right channel |
|
|
|
if (block) { |
|
|
|
__disable_irq(); |
|
|
|
if (block_right_1st == NULL) { |
|
|
|
block_right_1st = block; |
|
|
|
block_right_offset = 0; |
|
|
|
__enable_irq(); |
|
|
|
} else if (block_right_2nd == NULL) { |
|
|
|
block_right_2nd = block; |
|
|
|
__enable_irq(); |
|
|
|
} else { |
|
|
|
audio_block_t *tmp = block_right_1st; |
|
|
|
block_right_1st = block_right_2nd; |
|
|
|
block_right_2nd = block; |
|
|
|
block_right_offset = 0; |
|
|
|
__enable_irq(); |
|
|
|
release(tmp); |
|
|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
#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 AudioOutputSPDIF::config_SPDIF(void) |
|
|
|
{ |
|
|
|
SIM_SCGC6 |= SIM_SCGC6_I2S; |
|
|
|
SIM_SCGC7 |= SIM_SCGC7_DMA; |
|
|
|
SIM_SCGC6 |= SIM_SCGC6_DMAMUX; |
|
|
|
|
|
|
|
// 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 |
|
|
|
I2S0_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(0); |
|
|
|
I2S0_TCR3 = I2S_TCR3_TCE; |
|
|
|
|
|
|
|
//4 Words per Frame 32 Bit Word-Length -> 128 Bit Frame-Length, MSB First: |
|
|
|
I2S0_TCR4 = I2S_TCR4_FRSZ(3) | I2S_TCR4_SYWD(0) | I2S_TCR4_MF | I2S_TCR4_FSP | I2S_TCR4_FSD; |
|
|
|
I2S0_TCR5 = I2S_TCR5_WNW(31) | I2S_TCR5_W0W(31) | I2S_TCR5_FBT(31); |
|
|
|
|
|
|
|
I2S0_RCSR = 0; |
|
|
|
|
|
|
|
#if 0 |
|
|
|
// configure pin mux for 3 clock signals (debug only) |
|
|
|
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 |
|
|
|
#endif |
|
|
|
} |
Frank Bösing
9 년 전