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261 lines
7.8 KiB
261 lines
7.8 KiB
/* Audio Library for Teensy 3.X
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* Copyright (c) 2019, Paul Stoffregen, paul@pjrc.com
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*
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* Development of this audio library was funded by PJRC.COM, LLC by sales of
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* Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop
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* open source software by purchasing Teensy or other PJRC products.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice, development funding notice, and this permission
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* notice shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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by Frank Bösing
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*/
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#if defined(__IMXRT1052__) || defined(__IMXRT1062__)
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#include <Arduino.h>
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// Changed F32 on next two to f32 RSL 19May22
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#include "input_spdif3_f32.h"
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#include "output_spdif3_f32.h"
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#include "utility/imxrt_hw.h"
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// sign extend and scale
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static inline float32_t i24_to_f32(int32_t n) {
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const float32_t scale = 1.0 / (1LL << 31);
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int32_t leftaligned = (uint32_t)n << 8; // to avoid manual sign extension
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return scale * leftaligned;
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}
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DMAMEM __attribute__((aligned(32)))
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static uint32_t spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 4];
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audio_block_f32_t * AudioInputSPDIF3_F32::block_left = NULL;
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audio_block_f32_t * AudioInputSPDIF3_F32::block_right = NULL;
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uint16_t AudioInputSPDIF3_F32::block_offset = 0;
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bool AudioInputSPDIF3_F32::update_responsibility = false;
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DMAChannel AudioInputSPDIF3_F32::dma(false);
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FLASHMEM
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void AudioInputSPDIF3_F32::begin(void)
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{
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dma.begin(true); // Allocate the DMA channel first
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AudioOutputSPDIF3_F32::config_spdif3(sample_rate_Hz);
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const int nbytes_mlno = 2 * 4; // 8 Bytes per minor loop
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dma.TCD->SADDR = &SPDIF_SRL;
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dma.TCD->SOFF = 4;
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dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(2) | DMA_TCD_ATTR_DSIZE(2);
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dma.TCD->NBYTES_MLNO = DMA_TCD_NBYTES_MLOFFYES_NBYTES(nbytes_mlno) | DMA_TCD_NBYTES_SMLOE |
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DMA_TCD_NBYTES_MLOFFYES_MLOFF(-8);
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dma.TCD->SLAST = -8;
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dma.TCD->DADDR = spdif_rx_buffer;
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dma.TCD->DOFF = 4;
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dma.TCD->DLASTSGA = -sizeof(spdif_rx_buffer);
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dma.TCD->CITER_ELINKNO = sizeof(spdif_rx_buffer) / nbytes_mlno;
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dma.TCD->BITER_ELINKNO = sizeof(spdif_rx_buffer) / nbytes_mlno;
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dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
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dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SPDIF_RX);
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update_responsibility = update_setup();
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dma.attachInterrupt(isr);
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dma.enable();
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SPDIF_SRCD = 0;
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SPDIF_SCR |= SPDIF_SCR_DMA_RX_EN;
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CORE_PIN15_CONFIG = 3;
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IOMUXC_SPDIF_IN_SELECT_INPUT = 0; // GPIO_AD_B1_03_ALT3
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//pinMode(13, OUTPUT);
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}
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void AudioInputSPDIF3_F32::isr(void)
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{
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uint32_t daddr, offset;
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const int32_t *src, *end;
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float32_t *dest_left, *dest_right;
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audio_block_f32_t *left, *right;
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dma.clearInterrupt();
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//digitalWriteFast(13, !digitalReadFast(13));
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if (AudioInputSPDIF3_F32::update_responsibility) AudioStream::update_all();
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daddr = (uint32_t)(dma.TCD->DADDR);
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if (daddr < (uint32_t)spdif_rx_buffer + sizeof(spdif_rx_buffer) / 2) {
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// DMA is receiving to the first half of the buffer
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// need to remove data from the second half
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src = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 2];
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end = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES * 4];
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} else {
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// DMA is receiving to the second half of the buffer
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// need to remove data from the first half
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src = (int32_t *)&spdif_rx_buffer[0];
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end = (int32_t *)&spdif_rx_buffer[AUDIO_BLOCK_SAMPLES*2];
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}
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left = AudioInputSPDIF3_F32::block_left;
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right = AudioInputSPDIF3_F32::block_right;
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if (left != NULL && right != NULL) {
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offset = AudioInputSPDIF3_F32::block_offset;
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if (offset <= AUDIO_BLOCK_SAMPLES*2) {
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dest_left = &(left->data[offset]);
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dest_right = &(right->data[offset]);
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AudioInputSPDIF3_F32::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;
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do {
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#if IMXRT_CACHE_ENABLED >=1
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SCB_CACHE_DCIMVAC = (uintptr_t)src;
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asm("dsb":::"memory");
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#endif
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*dest_left++ = i24_to_f32(*src++);
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*dest_right++ = i24_to_f32(*src++);
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*dest_left++ = i24_to_f32(*src++);
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*dest_right++ = i24_to_f32(*src++);
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*dest_left++ = i24_to_f32(*src++);
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*dest_right++ = i24_to_f32(*src++);
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*dest_left++ = i24_to_f32(*src++);
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*dest_right++ = i24_to_f32(*src++);
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} while (src < end);
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}
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}
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else if (left != NULL) {
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offset = AudioInputSPDIF3_F32::block_offset;
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if (offset <= AUDIO_BLOCK_SAMPLES*2) {
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dest_left = &(left->data[offset]);
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AudioInputSPDIF3_F32::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;
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do {
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#if IMXRT_CACHE_ENABLED >=1
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SCB_CACHE_DCIMVAC = (uintptr_t)src;
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asm("dsb":::"memory");
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#endif
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*dest_left++ = i24_to_f32(*src++);
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src++;
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*dest_left++ = i24_to_f32(*src++);
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src++;
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*dest_left++ = i24_to_f32(*src++);
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src++;
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*dest_left++ = i24_to_f32(*src++);
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src++;
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} while (src < end);
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}
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}
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else if (right != NULL) {
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offset = AudioInputSPDIF3_F32::block_offset;
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if (offset <= AUDIO_BLOCK_SAMPLES*2) {
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dest_right = &(right->data[offset]);
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AudioInputSPDIF3_F32::block_offset = offset + AUDIO_BLOCK_SAMPLES*2;
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do {
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#if IMXRT_CACHE_ENABLED >=1
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SCB_CACHE_DCIMVAC = (uintptr_t)src;
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asm("dsb":::"memory");
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#endif
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src++;
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*dest_right++ = i24_to_f32(*src++);
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src++;
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*dest_right++ = i24_to_f32(*src++);
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src++;
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*dest_right++ = i24_to_f32(*src++);
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src++;
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*dest_right++ = i24_to_f32(*src++);
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} while (src < end);
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}
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}
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}
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void AudioInputSPDIF3_F32::update(void)
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{
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audio_block_f32_t *new_left=NULL, *new_right=NULL, *out_left=NULL, *out_right=NULL;
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// allocate 2 new blocks, but if one fails, allocate neither
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new_left = allocate_f32();
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if (new_left != NULL) {
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new_right = allocate_f32();
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if (new_right == NULL) {
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release(new_left);
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new_left = NULL;
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}
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}
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__disable_irq();
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if (block_offset >= AUDIO_BLOCK_SAMPLES) {
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// the DMA filled 2 blocks, so grab them and get the
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// 2 new blocks to the DMA, as quickly as possible
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out_left = block_left;
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block_left = new_left;
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out_right = block_right;
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block_right = new_right;
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block_offset = 0;
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__enable_irq();
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// then transmit the DMA's former blocks
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transmit(out_left, 0);
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release(out_left);
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transmit(out_right, 1);
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release(out_right);
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//Serial.print(".");
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} else if (new_left != NULL) {
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// the DMA didn't fill blocks, but we allocated blocks
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if (block_left == NULL) {
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// the DMA doesn't have any blocks to fill, so
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// give it the ones we just allocated
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block_left = new_left;
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block_right = new_right;
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block_offset = 0;
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__enable_irq();
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} else {
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// the DMA already has blocks, doesn't need these
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__enable_irq();
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release(new_left);
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release(new_right);
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}
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} else {
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// The DMA didn't fill blocks, and we could not allocate
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// memory... the system is likely starving for memory!
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// Sadly, there's nothing we can do.
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__enable_irq();
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}
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}
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bool AudioInputSPDIF3_F32::pllLocked(void)
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{
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return (SPDIF_SRPC & SPDIF_SRPC_LOCK) == SPDIF_SRPC_LOCK ? true:false;
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}
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unsigned int AudioInputSPDIF3_F32::sampleRate(void) {
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if (!pllLocked()) return 0;
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return (float)((uint64_t)F_BUS_ACTUAL * SPDIF_SRFM) / (0x8000000ULL * AudioOutputSPDIF3_F32::dpll_Gain()) + 0.5F;
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}
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#endif
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