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-
-
-
-
- #if defined(__IMXRT1052__) || defined(__IMXRT1062__)
-
- #include <Arduino.h>
- #include "output_spdif2.h"
- #include "utility/imxrt_hw.h"
-
- audio_block_t * AudioOutputSPDIF2::block_left_1st = NULL;
- audio_block_t * AudioOutputSPDIF2::block_right_1st = NULL;
- audio_block_t * AudioOutputSPDIF2::block_left_2nd = NULL;
- audio_block_t * AudioOutputSPDIF2::block_right_2nd = NULL;
- uint16_t AudioOutputSPDIF2::block_left_offset = 0;
- uint16_t AudioOutputSPDIF2::block_right_offset = 0;
- bool AudioOutputSPDIF2::update_responsibility = false;
- DMAChannel AudioOutputSPDIF2::dma(false);
- extern uint16_t spdif_bmclookup[256];
-
- DMAMEM __attribute__((aligned(32)))
- static uint32_t SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4];
-
- #define PREAMBLE_B (0xE8)
- #define PREAMBLE_M (0xE2)
- #define PREAMBLE_W (0xE4)
-
- #define VUCP_VALID ((0xCC) << 24)
- #define VUCP_INVALID ((0xD4) << 24)
-
- uint32_t AudioOutputSPDIF2::vucp = VUCP_VALID;
-
- FLASHMEM
- void AudioOutputSPDIF2::begin(void)
- {
-
- dma.begin(true);
-
- block_left_1st = NULL;
- block_right_1st = NULL;
-
-
- config_SPDIF();
-
- CORE_PIN2_CONFIG = 2;
- const int nbytes_mlno = 2 * 4;
-
- 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 = &I2S2_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_SAI2_TX);
- update_responsibility = update_setup();
- dma.enable();
-
- I2S2_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE | I2S_TCSR_FR;
- dma.attachInterrupt(isr);
- }
-
-
-
- void AudioOutputSPDIF2::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) {
-
-
- dest = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4/2];
- end = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4];
- if (AudioOutputSPDIF2::update_responsibility) AudioStream::update_all();
- } else {
-
-
- dest = (int32_t *)SPDIF_tx_buffer;
- end = (int32_t *)&SPDIF_tx_buffer[AUDIO_BLOCK_SAMPLES * 4/2];
- }
-
- block = AudioOutputSPDIF2::block_left_1st;
- if (block) {
- offset = AudioOutputSPDIF2::block_left_offset;
- src = &block->data[offset];
- do {
-
- sample = *src++;
-
-
- hi = spdif_bmclookup[(uint8_t)(sample >> 8)];
- lo = spdif_bmclookup[(uint8_t) sample];
- lo ^= (~((int16_t)hi) >> 16);
-
- *(dest+1) = ((uint32_t)lo << 16) | hi;
-
- aux = (0xB333 ^ (((uint32_t)((int16_t)lo)) >> 17));
-
- if (++frame > 191) {
-
- *(dest+0) = vucp | (PREAMBLE_B << 16 ) | aux;
- frame = 0;
- } else {
- *(dest+0) = vucp | (PREAMBLE_M << 16 ) | aux;
- }
- dest += 4;
-
- } while (dest < end);
- offset += AUDIO_BLOCK_SAMPLES/2;
- if (offset < AUDIO_BLOCK_SAMPLES) {
- AudioOutputSPDIF2::block_left_offset = offset;
- } else {
- AudioOutputSPDIF2::block_left_offset = 0;
- AudioStream::release(block);
- AudioOutputSPDIF2::block_left_1st = AudioOutputSPDIF2::block_left_2nd;
- AudioOutputSPDIF2::block_left_2nd = NULL;
- }
- } else {
- do {
- if ( ++frame > 191 ) {
- *(dest+0) = vucp | 0x00e8cccc;
- frame = 0;
- } else {
- *(dest+0) = vucp | 0x00e2cccc;
- }
- *(dest+1) = 0xccccccccUL;
-
- dest +=4;
- } while (dest < end);
- }
-
-
- dest -= AUDIO_BLOCK_SAMPLES * 4/2 - 4/2;
- block = AudioOutputSPDIF2::block_right_1st;
- if (block) {
- offset = AudioOutputSPDIF2::block_right_offset;
- src = &block->data[offset];
-
- do {
- sample = *src++;
-
-
- hi = spdif_bmclookup[(uint8_t)(sample >> 8)];
- lo = spdif_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) = vucp | (PREAMBLE_W << 16 ) | aux;
-
- dest += 4;
- } while (dest < end);
-
- offset += AUDIO_BLOCK_SAMPLES/2;
- if (offset < AUDIO_BLOCK_SAMPLES) {
- AudioOutputSPDIF2::block_right_offset = offset;
- } else {
- AudioOutputSPDIF2::block_right_offset = 0;
- AudioStream::release(block);
- AudioOutputSPDIF2::block_right_1st = AudioOutputSPDIF2::block_right_2nd;
- AudioOutputSPDIF2::block_right_2nd = NULL;
- }
- } else {
- do {
- *dest = vucp | 0x00e4ccccUL;
- *(dest+1) = 0xccccccccUL;
- dest += 4 ;
- } while (dest < end);
- }
-
- #if IMXRT_CACHE_ENABLED >= 2
- dest -= AUDIO_BLOCK_SAMPLES * 4/2 + 4/2;
- arm_dcache_flush_delete(dest, sizeof(SPDIF_tx_buffer) / 2 );
- #endif
-
- }
-
- void AudioOutputSPDIF2::mute_PCM(const bool mute)
- {
- vucp = mute?VUCP_INVALID:VUCP_VALID;
- }
-
- void AudioOutputSPDIF2::update(void)
- {
-
- audio_block_t *block;
- block = receiveReadOnly(0);
- 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);
- 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);
- }
- }
-
- }
-
- FLASHMEM
- void AudioOutputSPDIF2::config_SPDIF(void)
- {
- CCM_CCGR5 |= CCM_CCGR5_SAI2(CCM_CCGR_ON);
-
- int fs = AUDIO_SAMPLE_RATE_EXACT;
-
- int n1 = 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);
-
- CCM_CSCMR1 = (CCM_CSCMR1 & ~(CCM_CSCMR1_SAI2_CLK_SEL_MASK))
- | CCM_CSCMR1_SAI2_CLK_SEL(2);
- CCM_CS2CDR = (CCM_CS2CDR & ~(CCM_CS2CDR_SAI2_CLK_PRED_MASK | CCM_CS2CDR_SAI2_CLK_PODF_MASK))
- | CCM_CS2CDR_SAI2_CLK_PRED(n1-1)
- | CCM_CS2CDR_SAI2_CLK_PODF(n2-1);
- IOMUXC_GPR_GPR1 = (IOMUXC_GPR_GPR1 & ~(IOMUXC_GPR_GPR1_SAI2_MCLK3_SEL_MASK))
- | (IOMUXC_GPR_GPR1_SAI2_MCLK_DIR | IOMUXC_GPR_GPR1_SAI2_MCLK3_SEL(0));
-
-
- I2S2_TMR = 0;
- I2S2_TCR1 = I2S_TCR1_RFW(0);
- I2S2_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(0);
- I2S2_TCR3 = I2S_TCR3_TCE;
-
-
- I2S2_TCR4 = I2S_TCR4_FRSZ(3) | I2S_TCR4_SYWD(0) | I2S_TCR4_MF | I2S_TCR4_FSP | I2S_TCR4_FSD;
- I2S2_TCR5 = I2S_TCR5_WNW(31) | I2S_TCR5_W0W(31) | I2S_TCR5_FBT(31);
- #if 0
-
- CORE_PIN5_CONFIG = 2;
- CORE_PIN4_CONFIG = 2;
- CORE_PIN3_CONFIG = 2;
- #endif
- }
-
-
-
- #endif
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