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/* Audio Library for Teensy 3.X |
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* Copyright (c) 2014, 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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// Frank B |
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#if defined(__IMXRT1052__) || defined(__IMXRT1062__) |
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#include <Arduino.h> |
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#include "output_mqs.h" |
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#include "memcpy_audio.h" |
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#include "utility/imxrt_hw.h" |
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audio_block_t * AudioOutputMQS::block_left_1st = NULL; |
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audio_block_t * AudioOutputMQS::block_right_1st = NULL; |
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audio_block_t * AudioOutputMQS::block_left_2nd = NULL; |
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audio_block_t * AudioOutputMQS::block_right_2nd = NULL; |
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uint16_t AudioOutputMQS::block_left_offset = 0; |
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uint16_t AudioOutputMQS::block_right_offset = 0; |
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bool AudioOutputMQS::update_responsibility = false; |
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static uint32_t I2S3_tx_buffer[AUDIO_BLOCK_SAMPLES]; |
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DMAChannel AudioOutputMQS::dma(false); |
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void AudioOutputMQS::begin(void) |
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{ |
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dma.begin(true); // Allocate the DMA channel first |
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block_left_1st = NULL; |
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block_right_1st = NULL; |
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config_i2s(); |
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CORE_PIN10_CONFIG = 2;//B0_00 MQS_RIGHT |
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CORE_PIN12_CONFIG = 2;//B0_01 MQS_LEFT |
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dma.TCD->SADDR = I2S3_tx_buffer; |
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dma.TCD->SOFF = 2; |
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dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1); |
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dma.TCD->NBYTES_MLNO = 2; |
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dma.TCD->SLAST = -sizeof(I2S3_tx_buffer); |
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dma.TCD->DOFF = 0; |
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dma.TCD->CITER_ELINKNO = sizeof(I2S3_tx_buffer) / 2; |
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dma.TCD->DLASTSGA = 0; |
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dma.TCD->BITER_ELINKNO = sizeof(I2S3_tx_buffer) / 2; |
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dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR; |
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dma.TCD->DADDR = (void *)((uint32_t)&I2S3_TDR0 + 0); |
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dma.triggerAtHardwareEvent(DMAMUX_SOURCE_SAI3_TX); |
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I2S3_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE; |
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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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} |
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void AudioOutputMQS::isr(void) |
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{ |
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int16_t *dest; |
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audio_block_t *blockL, *blockR; |
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uint32_t saddr, offsetL, offsetR; |
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saddr = (uint32_t)(dma.TCD->SADDR); |
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dma.clearInterrupt(); |
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if (saddr < (uint32_t)I2S3_tx_buffer + sizeof(I2S3_tx_buffer) / 2) { |
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// DMA is transmitting the first half of the buffer |
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// so we must fill the second half |
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dest = (int16_t *)&I2S3_tx_buffer[AUDIO_BLOCK_SAMPLES/2]; |
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if (AudioOutputMQS::update_responsibility) AudioStream::update_all(); |
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} else { |
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// DMA is transmitting the second half of the buffer |
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// so we must fill the first half |
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dest = (int16_t *)I2S3_tx_buffer; |
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} |
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blockL = AudioOutputMQS::block_left_1st; |
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blockR = AudioOutputMQS::block_right_1st; |
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offsetL = AudioOutputMQS::block_left_offset; |
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offsetR = AudioOutputMQS::block_right_offset; |
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if (blockL && blockR) { |
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memcpy_tointerleaveLR(dest, blockL->data + offsetL, blockR->data + offsetR); |
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offsetL += AUDIO_BLOCK_SAMPLES / 2; |
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offsetR += AUDIO_BLOCK_SAMPLES / 2; |
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} else if (blockL) { |
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memcpy_tointerleaveL(dest, blockL->data + offsetL); |
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offsetL += AUDIO_BLOCK_SAMPLES / 2; |
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} else if (blockR) { |
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memcpy_tointerleaveR(dest, blockR->data + offsetR); |
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offsetR += AUDIO_BLOCK_SAMPLES / 2; |
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} else { |
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memset(dest,0,AUDIO_BLOCK_SAMPLES * 2); |
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return; |
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} |
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if (offsetL < AUDIO_BLOCK_SAMPLES) { |
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AudioOutputMQS::block_left_offset = offsetL; |
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} else { |
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AudioOutputMQS::block_left_offset = 0; |
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AudioStream::release(blockL); |
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AudioOutputMQS::block_left_1st = AudioOutputMQS::block_left_2nd; |
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AudioOutputMQS::block_left_2nd = NULL; |
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} |
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if (offsetR < AUDIO_BLOCK_SAMPLES) { |
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AudioOutputMQS::block_right_offset = offsetR; |
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} else { |
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AudioOutputMQS::block_right_offset = 0; |
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AudioStream::release(blockR); |
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AudioOutputMQS::block_right_1st = AudioOutputMQS::block_right_2nd; |
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AudioOutputMQS::block_right_2nd = NULL; |
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} |
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} |
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void AudioOutputMQS::update(void) |
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{ |
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// null audio device: discard all incoming data |
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//if (!active) return; |
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//audio_block_t *block = receiveReadOnly(); |
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//if (block) release(block); |
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//digitalWriteFast(13, LOW); |
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audio_block_t *block; |
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block = receiveReadOnly(0); // input 0 = left channel |
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if (block) { |
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__disable_irq(); |
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if (block_left_1st == NULL) { |
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block_left_1st = block; |
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block_left_offset = 0; |
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__enable_irq(); |
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} else if (block_left_2nd == NULL) { |
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block_left_2nd = block; |
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__enable_irq(); |
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} else { |
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audio_block_t *tmp = block_left_1st; |
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block_left_1st = block_left_2nd; |
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block_left_2nd = block; |
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block_left_offset = 0; |
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__enable_irq(); |
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release(tmp); |
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} |
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} |
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block = receiveReadOnly(1); // input 1 = right channel |
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if (block) { |
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__disable_irq(); |
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if (block_right_1st == NULL) { |
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block_right_1st = block; |
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block_right_offset = 0; |
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__enable_irq(); |
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} else if (block_right_2nd == NULL) { |
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block_right_2nd = block; |
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__enable_irq(); |
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} else { |
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audio_block_t *tmp = block_right_1st; |
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block_right_1st = block_right_2nd; |
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block_right_2nd = block; |
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block_right_offset = 0; |
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__enable_irq(); |
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release(tmp); |
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} |
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} |
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} |
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void AudioOutputMQS::config_i2s(void) |
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{ |
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CCM_CCGR5 |= CCM_CCGR5_SAI3(CCM_CCGR_ON); |
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CCM_CCGR0 |= CCM_CCGR0_MQS_HMCLK(CCM_CCGR_ON); |
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//PLL: |
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//TODO: Check if frequencies are correct! |
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int fs = AUDIO_SAMPLE_RATE_EXACT; |
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int oversample = 64; |
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// PLL between 27*24 = 648MHz und 54*24=1296MHz |
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int n1 = 4; //SAI prescaler 4 => (n1*n2) = multiple of 4 |
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int n2 = 1 + (24000000 * 27) / (fs * oversample * n1); |
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double C = ((double)fs * oversample * n1 * n2) / 24000000; |
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int c0 = C; |
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int c2 = 10000; |
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int c1 = C * c2 - (c0 * c2); |
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set_audioClock(c0, c1, c2); |
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CCM_CSCMR1 = (CCM_CSCMR1 & ~(CCM_CSCMR1_SAI3_CLK_SEL_MASK)) |
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| CCM_CSCMR1_SAI3_CLK_SEL(2); // &0x03 // (0,1,2): PLL3PFD0, PLL5, PLL4, |
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CCM_CS1CDR = (CCM_CS1CDR & ~(CCM_CS1CDR_SAI3_CLK_PRED_MASK | CCM_CS1CDR_SAI3_CLK_PODF_MASK)) |
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| CCM_CS1CDR_SAI3_CLK_PRED(n1-1) |
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| CCM_CS1CDR_SAI3_CLK_PODF(n2-1); |
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IOMUXC_GPR_GPR1 = (IOMUXC_GPR_GPR1 & ~(IOMUXC_GPR_GPR1_SAI3_MCLK3_SEL_MASK)) |
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| (IOMUXC_GPR_GPR1_SAI3_MCLK_DIR | IOMUXC_GPR_GPR1_SAI3_MCLK3_SEL(0)); //Select MCLK |
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IOMUXC_GPR_GPR2 = (IOMUXC_GPR_GPR2 & ~(IOMUXC_GPR_GPR2_MQS_OVERSAMPLE | IOMUXC_GPR_GPR2_MQS_CLK_DIV_MASK)) |
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| IOMUXC_GPR_GPR2_MQS_EN | IOMUXC_GPR_GPR2_MQS_OVERSAMPLE | IOMUXC_GPR_GPR2_MQS_CLK_DIV(0); |
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if (I2S3_TCSR & I2S_TCSR_TE) return; |
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I2S3_TMR = 0; |
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// I2S3_TCSR = (1<<25); //Reset |
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I2S3_TCR1 = I2S_TCR1_RFW(1); |
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I2S3_TCR2 = I2S_TCR2_SYNC(0) /*| I2S_TCR2_BCP*/ // sync=0; tx is async; |
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| (I2S_TCR2_BCD | I2S_TCR2_DIV((0)) | I2S_TCR2_MSEL(1)); |
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I2S3_TCR3 = I2S_TCR3_TCE; |
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I2S3_TCR4 = I2S_TCR4_FRSZ((2-1)) | I2S_TCR4_SYWD((16-1)) | I2S_TCR4_MF | I2S_TCR4_FSD /*| I2S_TCR4_FSE*/ /* | I2S_TCR4_FSP */; |
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I2S3_TCR5 = I2S_TCR5_WNW((16-1)) | I2S_TCR5_W0W((16-1)) | I2S_TCR5_FBT((16-1)); |
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} |
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#endif //defined(__IMXRT1062__) |
Frank Bösing
před 5 roky