You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
253 lines
8.7 KiB
253 lines
8.7 KiB
/* 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_f32.h"
|
|
#include "output_i2s_f32.h"
|
|
#include <arm_math.h>
|
|
|
|
DMAMEM static uint32_t i2s_rx_buffer[AUDIO_BLOCK_SAMPLES];
|
|
audio_block_t * AudioInputI2S_F32::block_left = NULL;
|
|
audio_block_t * AudioInputI2S_F32::block_right = NULL;
|
|
uint16_t AudioInputI2S_F32::block_offset = 0;
|
|
bool AudioInputI2S_F32::update_responsibility = false;
|
|
DMAChannel AudioInputI2S_F32::dma(false);
|
|
|
|
|
|
float AudioInputI2S_F32::sample_rate_Hz = AUDIO_SAMPLE_RATE;
|
|
int AudioInputI2S_F32::audio_block_samples = AUDIO_BLOCK_SAMPLES;
|
|
|
|
#define I2S_BUFFER_TO_USE_BYTES (AudioOutputI2S_F32::audio_block_samples*sizeof(i2s_rx_buffer[0]))
|
|
|
|
void AudioInputI2S_F32::begin(void)
|
|
{
|
|
dma.begin(true); // 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_F32::sample_rate_Hz = sample_rate_Hz;
|
|
AudioOutputI2S_F32::audio_block_samples = audio_block_samples;
|
|
AudioOutputI2S_F32::config_i2s();
|
|
|
|
CORE_PIN13_CONFIG = PORT_PCR_MUX(4); // pin 13, PTC5, I2S0_RXD0
|
|
#if defined(KINETISK)
|
|
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_tx_buffer) / 2; //original
|
|
dma.TCD->CITER_ELINKNO = I2S_BUFFER_TO_USE_BYTES / 2;
|
|
//dma.TCD->DLASTSGA = -sizeof(i2s_rx_buffer); //original
|
|
dma.TCD->DLASTSGA = -I2S_BUFFER_TO_USE_BYTES;
|
|
//dma.TCD->BITER_ELINKNO = sizeof(i2s_rx_buffer) / 2; //original
|
|
dma.TCD->BITER_ELINKNO = I2S_BUFFER_TO_USE_BYTES / 2;
|
|
dma.TCD->CSR = DMA_TCD_CSR_INTHALF | DMA_TCD_CSR_INTMAJOR;
|
|
#endif
|
|
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_F32::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);
|
|
#if defined(KINETISK)
|
|
daddr = (uint32_t)(dma.TCD->DADDR);
|
|
#endif
|
|
dma.clearInterrupt();
|
|
|
|
//if (daddr < (uint32_t)i2s_rx_buffer + sizeof(i2s_rx_buffer) / 2) {
|
|
if (daddr < (uint32_t)i2s_rx_buffer + I2S_BUFFER_TO_USE_BYTES / 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]; //original
|
|
//end = (int16_t *)&i2s_rx_buffer[AUDIO_BLOCK_SAMPLES]; //original
|
|
src = (int16_t *)&i2s_rx_buffer[audio_block_samples/2];
|
|
end = (int16_t *)&i2s_rx_buffer[audio_block_samples];
|
|
if (AudioInputI2S_F32::update_responsibility) AudioStream_F32::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]; //original
|
|
end = (int16_t *)&i2s_rx_buffer[audio_block_samples/2];
|
|
}
|
|
left = AudioInputI2S_F32::block_left;
|
|
right = AudioInputI2S_F32::block_right;
|
|
if (left != NULL && right != NULL) {
|
|
offset = AudioInputI2S_F32::block_offset;
|
|
//if (offset <= AUDIO_BLOCK_SAMPLES/2) { //original
|
|
if (offset <= ((uint32_t) audio_block_samples/2)) {
|
|
dest_left = &(left->data[offset]);
|
|
dest_right = &(right->data[offset]);
|
|
//AudioInputI2S_F32::block_offset = offset + AUDIO_BLOCK_SAMPLES/2; //original
|
|
AudioInputI2S_F32::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);
|
|
}
|
|
|
|
#define I16_TO_F32_NORM_FACTOR (3.051757812500000E-05) //which is 1/32768
|
|
void AudioInputI2S_F32::convert_i16_to_f32( int16_t *p_i16, float32_t *p_f32, int len) {
|
|
for (int i=0; i<len; i++) { *p_f32++ = ((float32_t)(*p_i16++)) * I16_TO_F32_NORM_FACTOR; }
|
|
}
|
|
|
|
void AudioInputI2S_F32::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 = AudioStream::allocate();
|
|
if (new_left != NULL) {
|
|
new_right = AudioStream::allocate();
|
|
if (new_right == NULL) {
|
|
AudioStream::release(new_left);
|
|
new_left = NULL;
|
|
}
|
|
}
|
|
__disable_irq();
|
|
//if (block_offset >= AUDIO_BLOCK_SAMPLES) { //original
|
|
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
|
|
|
|
// but, first, convert them to F32
|
|
audio_block_f32_t *out_left_f32=NULL, *out_right_f32=NULL;
|
|
out_left_f32 = AudioStream_F32::allocate_f32();
|
|
if (out_left_f32 != NULL) {
|
|
out_right_f32 = AudioStream_F32::allocate_f32();
|
|
if (out_right_f32 == NULL) {
|
|
AudioStream_F32::release(out_left_f32);
|
|
out_left_f32 = NULL;
|
|
}
|
|
}
|
|
if (out_left_f32 != NULL) {
|
|
//convert int16 to float 32
|
|
convert_i16_to_f32(out_left->data, out_left_f32->data, audio_block_samples);
|
|
convert_i16_to_f32(out_right->data, out_right_f32->data, audio_block_samples);
|
|
|
|
//transmit the f32 data!
|
|
AudioStream_F32::transmit(out_left_f32,0);
|
|
AudioStream_F32::transmit(out_right_f32,1);
|
|
AudioStream_F32::release(out_left_f32);
|
|
AudioStream_F32::release(out_right_f32);
|
|
}
|
|
AudioStream::release(out_left);
|
|
AudioStream::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();
|
|
AudioStream::release(new_left);
|
|
AudioStream::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.begin(true); // 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
|
|
#if defined(KINETISK)
|
|
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;
|
|
#endif
|
|
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);
|
|
}
|
|
*/
|
|
|
|
|
|
|
|
|