/* Audio Library for Teensy 3.X * Copyright (c) 2017, 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 #include "output_tdm.h" #include "memcpy_audio.h" #if defined(KINETISK) audio_block_t * AudioOutputTDM::block_input[16] = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }; bool AudioOutputTDM::update_responsibility = false; static uint32_t zeros[AUDIO_BLOCK_SAMPLES/2]; DMAMEM static uint32_t tdm_tx_buffer[AUDIO_BLOCK_SAMPLES*16]; DMAChannel AudioOutputTDM::dma(false); void AudioOutputTDM::begin(void) { dma.begin(true); // Allocate the DMA channel first for (int i=0; i < 16; i++) { block_input[i] = NULL; } // TODO: should we set & clear the I2S_TCSR_SR bit here? config_tdm(); CORE_PIN22_CONFIG = PORT_PCR_MUX(6); // pin 22, PTC1, I2S0_TXD0 dma.TCD->SADDR = tdm_tx_buffer; dma.TCD->SOFF = 4; dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(2) | DMA_TCD_ATTR_DSIZE(2); dma.TCD->NBYTES_MLNO = 4; dma.TCD->SLAST = -sizeof(tdm_tx_buffer); dma.TCD->DADDR = &I2S0_TDR0; dma.TCD->DOFF = 0; dma.TCD->CITER_ELINKNO = sizeof(tdm_tx_buffer) / 4; dma.TCD->DLASTSGA = 0; dma.TCD->BITER_ELINKNO = sizeof(tdm_tx_buffer) / 4; dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR; dma.triggerAtHardwareEvent(DMAMUX_SOURCE_I2S0_TX); update_responsibility = update_setup(); dma.enable(); I2S0_TCSR = I2S_TCSR_SR; I2S0_TCSR = I2S_TCSR_TE | I2S_TCSR_BCE | I2S_TCSR_FRDE; dma.attachInterrupt(isr); } // TODO: needs optimization... static void memcpy_tdm_tx(uint32_t *dest, const uint32_t *src1, const uint32_t *src2) { uint32_t i, in1, in2, out1, out2; for (i=0; i < AUDIO_BLOCK_SAMPLES/2; i++) { in1 = *src1++; in2 = *src2++; out1 = (in1 << 16) | (in2 & 0xFFFF); out2 = (in1 & 0xFFFF0000) | (in2 >> 16); *dest = out1; *(dest + 8) = out2; dest += 16; } } void AudioOutputTDM::isr(void) { uint32_t *dest; const uint32_t *src1, *src2; uint32_t i, saddr; saddr = (uint32_t)(dma.TCD->SADDR); dma.clearInterrupt(); if (saddr < (uint32_t)tdm_tx_buffer + sizeof(tdm_tx_buffer) / 2) { // DMA is transmitting the first half of the buffer // so we must fill the second half dest = tdm_tx_buffer + AUDIO_BLOCK_SAMPLES*8; } else { // DMA is transmitting the second half of the buffer // so we must fill the first half dest = tdm_tx_buffer; } if (update_responsibility) AudioStream::update_all(); for (i=0; i < 16; i += 2) { src1 = block_input[i] ? (uint32_t *)(block_input[i]->data) : zeros; src2 = block_input[i+1] ? (uint32_t *)(block_input[i+1]->data) : zeros; memcpy_tdm_tx(dest, src1, src2); dest++; } for (i=0; i < 16; i++) { if (block_input[i]) { release(block_input[i]); block_input[i] = NULL; } } } void AudioOutputTDM::update(void) { audio_block_t *prev[16]; unsigned int i; __disable_irq(); for (i=0; i < 16; i++) { prev[i] = block_input[i]; block_input[i] = receiveReadOnly(i); } __enable_irq(); for (i=0; i < 16; i++) { if (prev[i]) release(prev[i]); } } // MCLK needs to be 48e6 / 1088 * 512 = 22.588235 MHz -> 44.117647 kHz sample rate // #if F_CPU == 96000000 || F_CPU == 48000000 || F_CPU == 24000000 // PLL is at 96 MHz in these modes #define MCLK_MULT 4 #define MCLK_DIV 17 #elif F_CPU == 72000000 #define MCLK_MULT 16 #define MCLK_DIV 51 #elif F_CPU == 120000000 #define MCLK_MULT 16 #define MCLK_DIV 85 #elif F_CPU == 144000000 #define MCLK_MULT 8 #define MCLK_DIV 51 #elif F_CPU == 168000000 #define MCLK_MULT 16 #define MCLK_DIV 119 #elif F_CPU == 180000000 #define MCLK_MULT 32 #define MCLK_DIV 255 #define MCLK_SRC 0 #elif F_CPU == 192000000 #define MCLK_MULT 2 #define MCLK_DIV 17 #elif F_CPU == 216000000 #define MCLK_MULT 16 #define MCLK_DIV 153 #define MCLK_SRC 0 #elif F_CPU == 240000000 #define MCLK_MULT 8 #define MCLK_DIV 85 #else #error "This CPU Clock Speed is not supported by the Audio library"; #endif #ifndef MCLK_SRC #if F_CPU >= 20000000 #define MCLK_SRC 3 // the PLL #else #define MCLK_SRC 0 // system clock #endif #endif void AudioOutputTDM::config_tdm(void) { SIM_SCGC6 |= SIM_SCGC6_I2S; SIM_SCGC7 |= SIM_SCGC7_DMA; SIM_SCGC6 |= SIM_SCGC6_DMAMUX; // if either transmitter or receiver is enabled, do nothing if (I2S0_TCSR & I2S_TCSR_TE) return; if (I2S0_RCSR & I2S_RCSR_RE) return; // enable MCLK output I2S0_MCR = I2S_MCR_MICS(MCLK_SRC) | I2S_MCR_MOE; while (I2S0_MCR & I2S_MCR_DUF) ; I2S0_MDR = I2S_MDR_FRACT((MCLK_MULT-1)) | I2S_MDR_DIVIDE((MCLK_DIV-1)); // configure transmitter I2S0_TMR = 0; I2S0_TCR1 = I2S_TCR1_TFW(4); I2S0_TCR2 = I2S_TCR2_SYNC(0) | I2S_TCR2_BCP | I2S_TCR2_MSEL(1) | I2S_TCR2_BCD | I2S_TCR2_DIV(0); I2S0_TCR3 = I2S_TCR3_TCE; I2S0_TCR4 = I2S_TCR4_FRSZ(7) | I2S_TCR4_SYWD(0) | I2S_TCR4_MF | I2S_TCR4_FSE | I2S_TCR4_FSD; I2S0_TCR5 = I2S_TCR5_WNW(31) | I2S_TCR5_W0W(31) | I2S_TCR5_FBT(31); // configure receiver (sync'd to transmitter clocks) I2S0_RMR = 0; I2S0_RCR1 = I2S_RCR1_RFW(4); I2S0_RCR2 = I2S_RCR2_SYNC(1) | I2S_TCR2_BCP | I2S_RCR2_MSEL(1) | I2S_RCR2_BCD | I2S_RCR2_DIV(0); I2S0_RCR3 = I2S_RCR3_RCE; I2S0_RCR4 = I2S_RCR4_FRSZ(7) | I2S_RCR4_SYWD(0) | I2S_RCR4_MF | I2S_RCR4_FSE | I2S_RCR4_FSD; I2S0_RCR5 = I2S_RCR5_WNW(31) | I2S_RCR5_W0W(31) | I2S_RCR5_FBT(31); // configure pin mux for 3 clock signals CORE_PIN23_CONFIG = PORT_PCR_MUX(6); // pin 23, PTC2, I2S0_TX_FS (LRCLK) CORE_PIN9_CONFIG = PORT_PCR_MUX(6); // pin 9, PTC3, I2S0_TX_BCLK CORE_PIN11_CONFIG = PORT_PCR_MUX(6); // pin 11, PTC6, I2S0_MCLK } #endif // KINETISK