/* Audio Library for Teensy 3.X * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com * * Development of this audio library was funded by PJRC.COM, LLC by sales of * Teensy and Audio Adaptor boards. Please support PJRC's efforts to develop * open source software by purchasing Teensy or other PJRC products. * * 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 "input_i2s.h" #include "output_i2s.h" DMAMEM static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES]; audio_block_t * AudioInputI2S::block_left = NULL; audio_block_t * AudioInputI2S::block_right = NULL; uint16_t AudioInputI2S::block_offset = 0; bool AudioInputI2S::update_responsibility = false; void AudioInputI2S::begin(void) { dma(); // Allocate the DMA channel first //block_left_1st = NULL; //block_right_1st = NULL; // TODO: should we set & clear the I2S_RCSR_SR bit here? AudioOutputI2S::config_i2s(); CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0 dma().TCD->SADDR = &I2S0_RDR0; dma().TCD->SOFF = 0; dma().TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1); dma().TCD->NBYTES_MLNO = 2; dma().TCD->SLAST = 0; dma().TCD->DADDR = i2s_rx_buffer; dma().TCD->DOFF = 2; dma().TCD->CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2; dma().TCD->DLASTSGA = -sizeof(i2s_rx_buffer); dma().TCD->BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2; dma().TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR; dma().triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_RX); update_responsibility = update_setup(); dma().enable(); I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR; I2S0_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE; // TX clock enable, because sync'd to TX dma().attachInterrupt(isr); } void AudioInputI2S::isr(void) { uint32_t daddr, offset; const int16_t *src, *end; int16_t *dest_left, *dest_right; audio_block_t *left, *right; //digitalWriteFast(3, HIGH); daddr = (uint32_t)(dma().TCD->DADDR); dma().clearInterrupt(); if (daddr < (uint32_t)i2s_rx_buffer + sizeof(i2s_rx_buffer) / 2) { // DMA is receiving to the first half of the buffer // need to remove data from the second half src = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2]; end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES]; if (AudioInputI2S::update_responsibility) AudioStream::update_all(); } else { // DMA is receiving to the second half of the buffer // need to remove data from the first half src = (int16_t *)&i2s_rx_buffer[0]; end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES/2]; } left = AudioInputI2S::block_left; right = AudioInputI2S::block_right; if (left != NULL && right != NULL) { offset = AudioInputI2S::block_offset; if (offset <= AUDIO_BLOCK_SAMPLES/2) { dest_left = &(left->data[offset]); dest_right = &(right->data[offset]); AudioInputI2S::block_offset = offset + AUDIO_BLOCK_SAMPLES/2; do { //n = *src++; //*dest_left++ = (int16_t)n; //*dest_right++ = (int16_t)(n >> 16); *dest_left++ = *src++; *dest_right++ = *src++; } while (src < end); } } //digitalWriteFast(3, LOW); } void AudioInputI2S::update(void) { audio_block_t *new_left=NULL, *new_right=NULL, *out_left=NULL, *out_right=NULL; // allocate 2 new blocks, but if one fails, allocate neither new_left = allocate(); if (new_left != NULL) { new_right = allocate(); if (new_right == NULL) { release(new_left); new_left = NULL; } } __disable_irq(); if (block_offset >= AUDIO_BLOCK_SAMPLES) { // the DMA filled 2 blocks, so grab them and get the // 2 new blocks to the DMA, as quickly as possible out_left = block_left; block_left = new_left; out_right = block_right; block_right = new_right; block_offset = 0; __enable_irq(); // then transmit the DMA's former blocks transmit(out_left, 0); release(out_left); transmit(out_right, 1); release(out_right); //Serial.print("."); } else if (new_left != NULL) { // the DMA didn't fill blocks, but we allocated blocks if (block_left == NULL) { // the DMA doesn't have any blocks to fill, so // give it the ones we just allocated block_left = new_left; block_right = new_right; block_offset = 0; __enable_irq(); } else { // the DMA already has blocks, doesn't need these __enable_irq(); release(new_left); release(new_right); } } else { // The DMA didn't fill blocks, and we could not allocate // memory... the system is likely starving for memory! // Sadly, there's nothing we can do. __enable_irq(); } } /******************************************************************/ void AudioInputI2Sslave::begin(void) { dma(); // Allocate the DMA channel first //block_left_1st = NULL; //block_right_1st = NULL; AudioOutputI2Sslave::config_i2s(); CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0 dma().TCD->SADDR = &I2S0_RDR0; dma().TCD->SOFF = 0; dma().TCD->ATTR = DMA_TCD_ATTR_SSIZE(1) | DMA_TCD_ATTR_DSIZE(1); dma().TCD->NBYTES_MLNO = 2; dma().TCD->SLAST = 0; dma().TCD->DADDR = i2s_rx_buffer; dma().TCD->DOFF = 2; dma().TCD->CITER_ELINKNO = sizeof(i2s_rx_buffer) / 2; dma().TCD->DLASTSGA = -sizeof(i2s_rx_buffer); dma().TCD->BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2; dma().TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR; dma().triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_RX); update_responsibility = update_setup(); dma().enable(); I2S0_RCSR |= I2S_RCSR_RE | I2S_RCSR_BCE | I2S_RCSR_FRDE | I2S_RCSR_FR; I2S0_TCSR |= I2S_TCSR_TE | I2S_TCSR_BCE; // TX clock enable, because sync'd to TX dma().attachInterrupt(isr); }