forked from PaulStoffregen/Audio
/
control_wm8731.cpp
146 lines (114 loc) · 4.39 KB
/
control_wm8731.cpp
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/* 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 "control_wm8731.h"
#include "Wire.h"
#define WM8731_I2C_ADDR 0x1A
//#define WM8731_I2C_ADDR 0x1B
#define WM8731_REG_LLINEIN 0
#define WM8731_REG_RLINEIN 1
#define WM8731_REG_LHEADOUT 2
#define WM8731_REG_RHEADOUT 3
#define WM8731_REG_ANALOG 4
#define WM8731_REG_DIGITAL 5
#define WM8731_REG_POWERDOWN 6
#define WM8731_REG_INTERFACE 7
#define WM8731_REG_SAMPLING 8
#define WM8731_REG_ACTIVE 9
#define WM8731_REG_RESET 15
bool AudioControlWM8731::enable(void)
{
Wire.begin();
delay(5);
//write(WM8731_REG_RESET, 0);
write(WM8731_REG_INTERFACE, 0x02); // I2S, 16 bit, MCLK slave
write(WM8731_REG_SAMPLING, 0x20); // 256*Fs, 44.1 kHz, MCLK/1
// In order to prevent pops, the DAC should first be soft-muted (DACMU),
// the output should then be de-selected from the line and headphone output
// (DACSEL), then the DAC powered down (DACPD).
write(WM8731_REG_DIGITAL, 0x08); // DAC soft mute
write(WM8731_REG_ANALOG, 0x00); // disable all
write(WM8731_REG_POWERDOWN, 0x00); // codec powerdown
write(WM8731_REG_LHEADOUT, 0x80); // volume off
write(WM8731_REG_RHEADOUT, 0x80);
delay(100); // how long to power up?
write(WM8731_REG_ACTIVE, 1);
delay(5);
write(WM8731_REG_DIGITAL, 0x00); // DAC unmuted
write(WM8731_REG_ANALOG, 0x10); // DAC selected
return true;
}
bool AudioControlWM8731::write(unsigned int reg, unsigned int val)
{
Wire.beginTransmission(WM8731_I2C_ADDR);
Wire.write((reg << 1) | ((val >> 8) & 1));
Wire.write(val & 0xFF);
Wire.endTransmission();
return true;
}
bool AudioControlWM8731::volumeInteger(unsigned int n)
{
// n = 127 for max volume (+6 dB)
// n = 48 for min volume (-73 dB)
// n = 0 to 47 for mute
if (n > 127) n = 127;
//Serial.print("volumeInteger, n = ");
//Serial.println(n);
write(WM8731_REG_LHEADOUT, n | 0x180);
write(WM8731_REG_RHEADOUT, n | 0x80);
return true;
}
bool AudioControlWM8731::inputLevel(float n)
{
// range is 0x00 (min) - 0x1F (max)
int _level = int(n * 31.f);
_level = _level > 0x1F ? 0x1F : _level;
write(WM8731_REG_LLINEIN, _level);
write(WM8731_REG_RLINEIN, _level);
return true;
}
/******************************************************************/
bool AudioControlWM8731master::enable(void)
{
Wire.begin();
delay(5);
//write(WM8731_REG_RESET, 0);
write(WM8731_REG_INTERFACE, 0x42); // I2S, 16 bit, MCLK master
write(WM8731_REG_SAMPLING, 0x20); // 256*Fs, 44.1 kHz, MCLK/1
// In order to prevent pops, the DAC should first be soft-muted (DACMU),
// the output should then be de-selected from the line and headphone output
// (DACSEL), then the DAC powered down (DACPD).
write(WM8731_REG_DIGITAL, 0x08); // DAC soft mute
write(WM8731_REG_ANALOG, 0x00); // disable all
write(WM8731_REG_POWERDOWN, 0x00); // codec powerdown
write(WM8731_REG_LHEADOUT, 0x80); // volume off
write(WM8731_REG_RHEADOUT, 0x80);
delay(100); // how long to power up?
write(WM8731_REG_ACTIVE, 1);
delay(5);
write(WM8731_REG_DIGITAL, 0x00); // DAC unmuted
write(WM8731_REG_ANALOG, 0x10); // DAC selected
return true;
}