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output_ad5754_dual.cpp
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output_ad5754_dual.cpp
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/* This file is based on output_tdm from
* https://github.com/PaulStoffregen/Audio
*
* 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 <Arduino.h>
#include "output_ad5754_dual.h"
#include "memcpy_audio.h"
#include "utility/imxrt_hw.h"
#include <SPI.h>
#include <imxrt.h>
#include <cstdint>
#include <DMAChannel.h>
/* AD5754R Register Map */
#define AD5754R_REG_DAC 0x00 // DAC register
#define AD5754R_REG_RANGE_SELECT 0x01 // Output range select register
#define AD5754R_REG_POWER_CONTROL 0x02 // Power control register
#define AD5754R_REG_CONTROL 0x03 // Control register
/* AD5754R Channel Address */
#define AD5754R_DAC_A 0x00 // Address of channel A
#define AD5754R_DAC_B 0x01 // Address of channel B
#define AD5754R_DAC_C 0x02 // Address of channel C
#define AD5754R_DAC_D 0x03 // Address of channel D
#define AD5754R_DAC_ALL 0x04 // All four DACs
/* AD5754R Range Bits */
#define AD5754R_UNIPOLAR_5_RANGE 0x00 // 0..+5(V)
#define AD5754R_UNIPOLAR_10_RANGE 0x01 // 0..+10(V)
#define AD5754R_UNIPOLAR_10_8_RANGE 0x02 // 0..+10.8(V)
#define AD5754R_BIPOLAR_5_RANGE 0x03 // -5..+5(V)
#define AD5754R_BIPOLAR_10_RANGE 0x04 // -10...+10(V)
#define AD5754R_BIPOLAR_10_8_RANGE 0x05 // -10.8...+10.8(V)
audio_block_t * AudioOutputAD5754Dual::block_input[8] = {
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};
bool AudioOutputAD5754Dual::update_responsibility = false;
unsigned int AudioOutputAD5754Dual::read_index = 128;
unsigned int AudioOutputAD5754Dual::DA_SYNC = 16;
volatile uint8_t AudioOutputAD5754Dual::buf[6] = {0,0,0,0,0,0};
int AudioOutputAD5754Dual::voltages[8] = {0,0,0,0,0,0,0,0};
unsigned int AudioOutputAD5754Dual::commandsTransmitted = 0;
IntervalTimer AudioOutputAD5754Dual::_timer = IntervalTimer();
DMAChannel AudioOutputAD5754Dual::dma(false);
void AudioOutputAD5754Dual::begin(void)
{
//pinMode(0, OUTPUT); //debug pin
pinMode(DA_SYNC, OUTPUT);
digitalWrite(DA_SYNC, HIGH);
SPI1.begin();
delay(1);
// Initialize DAC0, DAC1
SPI1.beginTransaction(SPISettings());
digitalWrite(DA_SYNC, LOW);
uint8_t configureDac[] = {
0x10,
0x00,
0x0f,
0x10,
0x00,
0x0f
};
SPI1.transfer(configureDac, 6);
SPI1.endTransaction();
digitalWrite(DA_SYNC, HIGH);
delayMicroseconds(10);
// Set voltage range for DAC0, DAC1
digitalWrite(DA_SYNC, LOW);
uint8_t configureDacVoltageRange[] = {
(AD5754R_REG_RANGE_SELECT << 3) + AD5754R_DAC_ALL,
0x00,
AD5754R_BIPOLAR_10_RANGE,
(AD5754R_REG_RANGE_SELECT << 3) + AD5754R_DAC_ALL,
0x00,
AD5754R_BIPOLAR_10_RANGE
};
SPI1.beginTransaction(SPISettings());
SPI1.transfer(configureDacVoltageRange, 6);
SPI1.endTransaction();
digitalWrite(DA_SYNC, HIGH);
delayMicroseconds(10);
config_dma();
for (int i=0; i < 8; i++) {
block_input[i] = NULL;
}
_timer.priority(1);
}
void AudioOutputAD5754Dual::timer(void) {
_timer.end();
if (read_index < 128)
beginTransfer();
}
void AudioOutputAD5754Dual::isr(void)
{
commandsTransmitted++;
unsigned int tx = commandsTransmitted;
dma.clearInterrupt();
SPI1.endTransaction();
IMXRT_LPSPI3_S.FCR = LPSPI_FCR_TXWATER(15); // FIFO control register: set transmit watermark
IMXRT_LPSPI3_S.DER = 0; // DMA enable register: disable DMA TX
IMXRT_LPSPI3_S.CR = LPSPI_CR_MEN | LPSPI_CR_RRF | LPSPI_CR_RTF; // Control register... ?
IMXRT_LPSPI3_S.SR = 0x3f00; // Status register: clear out all of the other status...
while (IMXRT_LPSPI3_S.FSR & 0x1f); //FIFO Status Register? wait until FIFO is empty before continuing...
while (IMXRT_LPSPI3_S.SR & LPSPI_SR_MBF) ; //Status Register? Module Busy flag, wait until SPI is not busy...
digitalWrite(DA_SYNC, HIGH);
if (tx < 4) {
buf[0] = commandsTransmitted; //DAC0, channel=count
buf[1] = voltages[commandsTransmitted] >> 8;
buf[2] = voltages[commandsTransmitted] & 0xff;
buf[3] = commandsTransmitted; //DAC1, channel=count
buf[4] = voltages[commandsTransmitted+4] >> 8;
buf[5] = voltages[commandsTransmitted+4] & 0xff;
beginTransfer();
} else {
commandsTransmitted = 0;
read_index++;
}
}
const uint32_t zero_level = 0xFFFF / 2;
void AudioOutputAD5754Dual::beginTransfer()
{
if (commandsTransmitted == 0) {
if (read_index >= 128){
return;
}
voltages[0] = (block_input[0] != NULL) ? block_input[0]->data[read_index] + zero_level : zero_level;
voltages[1] = (block_input[1] != NULL) ? block_input[1]->data[read_index] + zero_level : zero_level;
voltages[2] = (block_input[2] != NULL) ? block_input[2]->data[read_index] + zero_level : zero_level;
voltages[3] = (block_input[3] != NULL) ? block_input[3]->data[read_index] + zero_level : zero_level;
voltages[4] = (block_input[4] != NULL) ? block_input[4]->data[read_index] + zero_level : zero_level;
voltages[5] = (block_input[5] != NULL) ? block_input[5]->data[read_index] + zero_level : zero_level;
voltages[6] = (block_input[6] != NULL) ? block_input[6]->data[read_index] + zero_level : zero_level;
voltages[7] = (block_input[7] != NULL) ? block_input[7]->data[read_index] + zero_level : zero_level;
// first 3 bytes -> DAC0
buf[0] = 0x00; // channel == 0
buf[1] = voltages[0] >> 8;
buf[2] = voltages[0] & 0xff;
// second 3 bytes -> DAC1
buf[3] = 0x00; // channel == 0
buf[4] = voltages[4] >> 8;
buf[5] = voltages[4] & 0xff;
}
if (commandsTransmitted < 4) {
digitalWrite(DA_SYNC, LOW);
IMXRT_LPSPI3_S.TCR = (IMXRT_LPSPI3_S.TCR & ~(LPSPI_TCR_FRAMESZ(31))) | LPSPI_TCR_FRAMESZ(7); // Transmit Control Register: ?
IMXRT_LPSPI3_S.FCR = 0; // FIFO control register
IMXRT_LPSPI3_S.DER = LPSPI_DER_TDDE;//DMA Enable register: enable DMA on TX
IMXRT_LPSPI3_S.SR = 0x3f00; // StatusRegister: clear out all of the other status...
_timer.begin(timer, (1000000.0/44100.0)-13.055);
SPI1.beginTransaction(SPISettings(20000000, MSBFIRST, SPI_MODE0));
dma.enable();
}
}
void AudioOutputAD5754Dual::update(void)
{
//digitalWrite(0, LOW);
audio_block_t *prev[8];
unsigned int i;
__disable_irq();
for (i=0; i < 8; i++) {
prev[i] = block_input[i];
block_input[i] = receiveReadOnly(i);
}
read_index = 0;
commandsTransmitted = 0;
__enable_irq();
for (i=0; i < 8; i++) {
if (prev[i]) release(prev[i]);
}
beginTransfer();
//digitalWrite(0, HIGH);
}
void AudioOutputAD5754Dual::config_dma(void)
{
dma.begin(true); // allocate the DMA channel first
dma.TCD->SADDR = buf;
dma.TCD->SOFF = 1;
dma.TCD->ATTR = DMA_TCD_ATTR_SSIZE(0) | DMA_TCD_ATTR_DSIZE(0);
dma.TCD->NBYTES_MLNO = 1;
dma.TCD->SLAST = -sizeof(buf);
dma.TCD->DOFF = 0;
dma.TCD->CITER_ELINKNO = sizeof(buf);
dma.TCD->DLASTSGA = 0;
dma.TCD->BITER_ELINKNO = sizeof(buf);
dma.TCD->CSR = DMA_TCD_CSR_INTMAJOR;
dma.TCD->DADDR = (void *)((uint32_t)&(IMXRT_LPSPI3_S.TDR));
dma.triggerAtHardwareEvent(DMAMUX_SOURCE_LPSPI3_TX);
dma.disableOnCompletion();
dma.attachInterrupt(isr);
dma.interruptAtCompletion();
}