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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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#include "input_i2s_quad.h" |
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#include "output_i2s_quad.h" |
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DMAMEM static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES*2]; |
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audio_block_t * AudioInputI2SQuad::block_ch1 = NULL; |
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audio_block_t * AudioInputI2SQuad::block_ch2 = NULL; |
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audio_block_t * AudioInputI2SQuad::block_ch3 = NULL; |
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audio_block_t * AudioInputI2SQuad::block_ch4 = NULL; |
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uint16_t AudioInputI2SQuad::block_offset = 0; |
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bool AudioInputI2SQuad::update_responsibility = false; |
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DMAChannel AudioInputI2SQuad::dma(false); |
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#if defined(__MK20DX256__) |
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void AudioInputI2SQuad::begin(void) |
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{ |
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dma.begin(true); // Allocate the DMA channel first |
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// TODO: should we set & clear the I2S_RCSR_SR bit here? |
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AudioOutputI2SQuad::config_i2s(); |
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CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0 |
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CORE_PIN30_CONFIG = PORT_PCR_MUX(4); // pin 30, PTC11, I2S0_RXD1 |
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#if defined(KINETISK) |
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dma.TCD->SADDR = &I2S0_RDR0; |
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dma.TCD->SOFF = 4; |
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dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_SMOD(3) | DMA_TCD_ATTR_DSIZE(1); |
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dma.TCD->NBYTES_MLNO = 4; |
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dma.TCD->SLAST = 0; |
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dma.TCD->DADDR = i2s_rx_buffer; |
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dma.TCD->DOFF = 2; |
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dma.TCD->CITER_ELINKNO = sizeof(i2s_rx_buffer) / 4; |
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dma.TCD->DLASTSGA = -sizeof(i2s_rx_buffer); |
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dma.TCD->BITER_ELINKNO = sizeof(i2s_rx_buffer) / 4; |
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dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR; |
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#endif |
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dma.triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_RX); |
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update_responsibility = update_setup(); |
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dma.enable(); |
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I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR; |
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I2S0_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE; // TX clock enable, because sync'd to TX |
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dma.attachInterrupt(isr); |
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} |
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void AudioInputI2SQuad::isr(void) |
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{ |
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uint32_t daddr, offset; |
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const int16_t *src; |
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int16_t *dest1, *dest2, *dest3, *dest4; |
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//digitalWriteFast(3, HIGH); |
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daddr = (uint32_t)(dma.TCD->DADDR); |
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dma.clearInterrupt(); |
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if (daddr < (uint32_t)i2s_rx_buffer + sizeof(i2s_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 = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES]; |
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if (update_responsibility) update_all(); |
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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 = (int16_t *)&i2s_rx_buffer[0]; |
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} |
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if (block_ch1) { |
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offset = block_offset; |
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if (offset <= AUDIO_BLOCK_SAMPLES/2) { |
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block_offset = offset + AUDIO_BLOCK_SAMPLES/2; |
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dest1 = &(block_ch1->data[offset]); |
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dest2 = &(block_ch2->data[offset]); |
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dest3 = &(block_ch3->data[offset]); |
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dest4 = &(block_ch4->data[offset]); |
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for (int i=0; i < AUDIO_BLOCK_SAMPLES/2; i++) { |
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*dest1++ = *src++; |
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*dest3++ = *src++; |
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*dest2++ = *src++; |
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*dest4++ = *src++; |
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} |
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} |
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} |
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//digitalWriteFast(3, LOW); |
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} |
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void AudioInputI2SQuad::update(void) |
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{ |
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audio_block_t *new1, *new2, *new3, *new4; |
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audio_block_t *out1, *out2, *out3, *out4; |
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// allocate 4 new blocks |
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new1 = allocate(); |
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new2 = allocate(); |
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new3 = allocate(); |
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new4 = allocate(); |
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// but if any fails, allocate none |
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if (!new1 || !new2 || !new3 || !new4) { |
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if (new1) { |
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release(new1); |
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new1 = NULL; |
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} |
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if (new2) { |
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release(new2); |
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new2 = NULL; |
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} |
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if (new3) { |
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release(new3); |
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new3 = NULL; |
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} |
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if (new4) { |
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release(new4); |
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new4 = 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 4 blocks, so grab them and get the |
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// 4 new blocks to the DMA, as quickly as possible |
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out1 = block_ch1; |
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block_ch1 = new1; |
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out2 = block_ch2; |
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block_ch2 = new2; |
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out3 = block_ch3; |
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block_ch3 = new3; |
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out4 = block_ch4; |
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block_ch4 = new4; |
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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(out1, 0); |
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release(out1); |
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transmit(out2, 1); |
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release(out2); |
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transmit(out3, 2); |
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release(out3); |
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transmit(out4, 3); |
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release(out4); |
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} else if (new1 != NULL) { |
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// the DMA didn't fill blocks, but we allocated blocks |
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if (block_ch1 == 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_ch1 = new1; |
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block_ch2 = new2; |
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block_ch3 = new3; |
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block_ch4 = new4; |
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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(new1); |
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release(new2); |
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release(new3); |
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release(new4); |
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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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#else // not __MK20DX256__ |
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void AudioInputI2SQuad::begin(void) |
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{ |
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} |
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#endif |
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PaulStoffregen
пре 8 година