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drivers/codec: Add driver for the WM8960 codec. 

This codec is assembled for the MIMXRT1xxx_DEV boards and available for
WM8960 breakout boards as well.

The driver itself has been tested as working with the MIMXRT boards and a
Sparkfun WM6890 breakout board.  It implements the initialization, basic
methods and some enhanced methods like 3D, ALC, soft-mute and deemphasis.
pull/8476/head
robert-hh 3 years ago
committed by Damien George
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  1. 7
      docs/library/index.rst
  2. 7
      docs/library/machine.I2S.rst
  3. 397
      docs/library/wm8960.rst
  4. 753
      drivers/codec/wm8960.py

7
docs/library/index.rst
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@ -97,6 +97,13 @@ the following libraries.
network.rst
uctypes.rst
The following libraries provide drivers for hardware components.
.. toctree::
:maxdepth: 1
wm8960.rst
Port-specific libraries
-----------------------

7
docs/library/machine.I2S.rst
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@ -72,6 +72,13 @@ uasyncio::
sreader = uasyncio.StreamReader(audio_in)
num_read = await sreader.readinto(buf)
Some codec devices like the WM8960 or SGTL5000 require separate initialization
before they can operate with the I2S class. For these, separate drivers are
supplied, which also offer methods for controlling volume, audio processing and
other things. For these drivers see:
- :ref:`wm8960`
Constructor
-----------

397
docs/library/wm8960.rst
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@ -0,0 +1,397 @@
.. _wm8960:
:mod:`WM8960` -- Driver for the WM8960 codec
============================================
This driver is used to control a WM8960 codec chip. It is a Python
translation of the C-Code provided by NXP/Freescale for their i.MX RT series of
MCUs. Very little has been added, and just a few API related names were changed
or added to cope with the naming style of MicroPython.
The primary purpose of the driver is initialization and setting operation modes
of the codec. It does not do the audio data processing for the codec. That is
the task of a separate driver.
The WM8960 supports an I2C interface, in addition to the audio interface. The
connection depends on the interface used and the number of devices in the
system. For the I2C interface, SCL and SDA have to be connected, and of course
GND and Vcc. The I2C default address is ``0x1A``.
Constructor
-----------
.. class:: WM8960(i2c, sample_rate, *, bits=16, swap=SWAP_NONE, route=ROUTE_PLAYBACK_RECORD, left_input=INPUT_MIC3, right_input=INPUT_MIC2, sysclk_source=SYSCLK_MCLK, mclk_freq=None, primary=False, adc_sync=SYNC_DAC, protocol=BUS_I2S, i2c_address=WM8960_I2C_ADDR)
Create a WM8960 driver object, initialize the device with default settings and return the
WM8960 object.
Only the first two arguments are mandatory. All others are optional. The arguments are:
- *i2c* is the I2C bus object.
- *sample_rate* is the audio sample rate. Acceptable values are 8000,
11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000, 96000, 192000
and 384000. Note that not every I2S hardware will support all values.
- *bits* is the number of bits per audio word. Acceptable value are 16,
20, 24, and 32.
- *swap* swaps the left & right channel, if set; see below for options.
- *route* Setting the audio path in the codec; see below for options.
- *left_input* sets the audio source for the left input channel;
see below for options.
- *right_input* sets the audio source for the right input channel;
see below for options.
- *play_source* sets the audio target for the output audio;
see below for options.
- *sysclk_source* controls whether the internal master clock called
"sysclk" is directly taken from the MCLK input or derived from it
using an internal PLL. It is usually not required to change this.
- *mclk_freq* sets the mclk frequency applied to the MCLK pin of the
codec. If not set, default values are used.
- *primary* lets the WM8960 act as primary or secondary device. The
default setting is ``False``. When set to ``False``,
*sample_rate* and *bits* are controlled by the MCU.
- *adc_sync* sets which input is used for the ADC sync signal.
The default is using the DACLRC pin.
- *protocol* sets the communication protocol. The default is I2S.
See below for all options.
- *i2c_address* sets the I2C address of the WM8960, with default ``0x1A``.
If *mclk_freq* is not set the following default values are used:
- sysclk_source == SYSCLK_PLL: 11.2896 MHz for sample rates of 44100,
22050 and 11015 Hz, and 12.288 Mhz for sample rates < 48000, otherwise
sample_rate * 256.
- sysclk_source == SYSCLK_MCLK: sample_rate * 256.
If the MCLK signal is applied using, for example,. a separate oscillator,
it must be specified for proper operation.
Tables of parameter constants
-----------------------------
.. table:: **Swap Parameter**
:widths: auto
:align: left
===== ====
Value Name
===== ====
0 SWAP_NONE
1 SWAP_INPUT
2 SWAP_OUTPUT
===== ====
.. table:: **Protocol Parameter**
:widths: auto
:align: left
===== ====
Value Name
===== ====
2 BUS_I2S
1 BUS_LEFT_JUSTIFIED
0 BUS_RIGHT_JUSTIFIED
3 BUS_PCMA
19 BUS_PCMB
===== ====
.. table:: **Input Source Parameter**
:widths: auto
:align: left
===== ============ ====
Value Name Type
===== ============ ====
0 INPUT_CLOSED
1 INPUT_MIC1 Single ended
2 INPUT_MIC2 Differential
3 INPUT_MIC3 Differential
4 INPUT_LINE2
5 INPUT_LINE3
===== ============ ====
.. table:: **Route Parameter**
:widths: auto
:align: left
===== ====
Value Name
===== ====
0 ROUTE_BYPASS
1 ROUTE_PLAYBACK
2 ROUTE_PLAYBACK_RECORD
5 ROUTE_RECORD
===== ====
.. table:: **Master Clock Source Parameter**
:widths: auto
:align: left
===== ====
Value Name
===== ====
0 SYSCLK_MCLK
1 SYSCLK_PLL
===== ====
.. table:: **Module Names**
:widths: auto
:align: left
===== ====
Value Name
===== ====
0 MODULE_ADC
1 MODULE_DAC
2 MODULE_VREF
3 MODULE_HEADPHONE
4 MODULE_MIC_BIAS
5 MODULE_MIC
6 MODULE_LINE_IN
7 MODULE_LINE_OUT
8 MODULE_SPEAKER
9 MODULE_OMIX
10 MODULE_MONO_OUT
===== ====
.. table:: **Play Channel Names**
:widths: auto
:align: left
===== ====
Value Name
===== ====
1 PLAY_HEADPHONE_LEFT
2 PLAY_HEADPHONE_RIGHT
4 PLAY_SPEAKER_LEFT
8 PLAY_SPEAKER_RIGHT
===== ====
.. table:: **adc_sync Parameters**
:widths: auto
:align: left
===== ====
Value Name
===== ====
0 SYNC_ADC
1 SYNC_DAC
===== ====
Methods
-------
In addition to initialization, the driver provides some useful methods for
controlling its operation:
.. method:: WM8960.set_left_input(input_source)
Specify the source for the left input. The input source names are listed above.
.. method:: WM8960.set_right_input(input_source)
Specify the source for the right input. The input source names are listed above.
.. method:: WM8960.volume(module, volume_l=None, volume_r=None)
Sets or gets the volume of a certain module.
If no volume values are supplied, the actual volume tuple is returned.
If one or two values are supplied, it sets the volume of a certain module.
If two values are provided, the first one is used for the left channel,
the second for the right channel. If only one value is supplied, it is used
for both channels. The value range is normalized to 0.0-100.0 with a
logarithmic scale.
For a list of suitable modules and db/step, see the table below.
.. table:: **Module Names and dB steps**
:widths: auto
:align: center
======= ====
dB/Step Name
======= ====
1.28 MODULE_ADC
1.28 MODULE_DAC
0.8 MODULE_HEADPHONE
0.475 MODULE_LINE_IN
0.8 MODULE_SPEAKER
======= ====
.. method:: WM8960.mute(module, mute, soft=True, ramp=wm8960.MUTE_FAST)
Mute or unmute the output. If *mute* is True, the output is muted, if ``False``
it is unmuted.
If *soft* is set as True, muting will happen as a soft transition. The time for
the transition is defined by *ramp*, which is either ``MUTE_FAST`` or ``MUTE_SLOW``.
.. method:: WM8960.set_data_route(route)
Set the audio data route. For the parameter value/names, see the table above.
.. method:: WM8960.set_module(module, active)
Enable or disable a module, with *active* being ``False`` or ``True``. For
the list of module names, see the table above.
Note that enabling ``MODULE_MONO_OUT`` is different from the `WM8960.mono`
method. The first enables output 3, while the `WM8960.mono` method sends a
mono mix to the left and right output.
.. method:: WM8960.enable_module(module)
Enable a module. For the list of module names, see the table above.
.. method:: WM8960.disable_module(module)
Disable a module. For the list of module names, see the table above.
.. method:: WM8960.expand_3d(level)
Enable Stereo 3D exansion. *level* is a number between 0 and 15.
A value of 0 disables the expansion.
.. method:: WM8960.mono(active)
If *active* is ``True``, a Mono mix is sent to the left and right output
channel. This is different from enabling the ``MODULE_MONO_MIX``, which
enables output 3.
.. method:: WM8960.alc_mode(channel, mode=ALC_MODE)
Enables or disables ALC mode. Parameters are:
- *channel* enables and sets the channel for ALC. The parameter values are:
- ALC_OFF: Switch ALC off
- ALS_RIGHT: Use the right input channel
- ALC_LEFT: Use the left input channel
- ALC_STEREO: Use both input channels.
- *mode* sets the ALC mode. Input values are:
- ALC_MODE: act as ALC
- ALC_LIMITER: act as limiter.
.. method:: WM8960.alc_gain(target=-12, max_gain=30, min_gain=-17.25, noise_gate=-78)
Set the target level, highest and lowest gain levels and the noise gate as dB level.
Permitted ranges are:
- *target*: -22.5 to -1.5 dB
- *max_gain*: -12 to 30 dB
- *min_gain*: -17 to 25 dB
- *noise_gate*: -78 to -30 dB
Excess values are limited to the permitted ranges. A value of -78 or less
for *noise_gate* disables the noise gate function.
.. method:: WM8960.alc_time(attack=24, decay=192, hold=0)
Set the dynamic characteristic of ALC. The times are given as millisecond
values. Permitted ranges are:
- *attack*: 6 to 6140
- *decay*: 24 to 24580
- *hold*: 0 to 43000
Excess values are limited within the permitted ranges.
.. method:: WM8960.deemphasis(active)
Enables or disables a deemphasis filter for playback, with *active* being
``False`` or ``True``. This filter is applied only for sample rates of
32000, 44100 and 48000. For other sample rates, the filter setting
is silently ignored.
.. method:: WM8960.deinit()
Disable all modules.
Examples
--------
Run WM8960 in secondary mode (default)::
# Micro_python WM8960 Codec driver
#
# Setting the driver to Slave mode using the default settings
#
from machine import Pin, I2C
import wm8960
i2c = I2C(0)
wm=wm8960.WM8960(i2c, 32000, left_input=wm8960.INPUT_MIC1)
wm.set_volume(wm8960.MODULE_HEADPHONE, 100)
Run WM8960 in primary mode::
# Micro_python WM8960 Codec driver
#
# Setting the driver to Master mode using specific audio format settings
#
from machine import Pin, I2C
import wm8960
i2c = I2C(0)
wm=wm8960.WM8960(i2c, 44100, primary=True, bits=16)
Run WM8960 on a MIMXRT10xx_DEV board in secondary mode (default)::
# Micro_python WM8960 Codec driver
#
# Setting the driver to Slave mode using the default settings
# swap the input channels such that a MIMXRT Dev board mic, which
# is connected to the right input, is assigned to the left audio channel.
#
from machine import Pin, I2C
import wm8960
i2c = I2C(0)
wm=wm8960.WM8960(i2c, sample_rate=16_000,
adc_sync=wm8960.SYNC_DAC,
swap=wm8960.SWAP_INPUT,
sysclk_source=wm8960.SYSCLK_MCLK)
Record with a Sparkfun WM8960 breakout board with Teensy in secondary mode (default)::
# Micro_python WM8960 Codec driver
#
# The breakout board uses a fixed 24MHz MCLK. Therefore the internal
# PLL must be used as sysclk, which is the master audio clock.
# The Sparkfun board has the WS pins for RX and TX connected on the
# board. Therefore adc_sync must be set to sync_adc, to configure
# it's ADCLRC pin as input.
#
from machine import Pin, I2C
import wm8960
i2c = I2C(0)
wm=wm8960.WM8960(i2c, sample_rate=16_000,
adc_sync=wm8960.SYNC_ADC,
sysclk_source=wm8960.SYSCLK_PLL,
mclk_freq=24_000_000,
left_input=wm8960.INPUT_MIC1,
right_input=wm8960.INPUT_CLOSED)
Play with a Sparkfun WM8960 breakout board with Teensy in secondary mode (default)::
# The breakout board uses a fixed 24MHz MCLK. Therefore the internal
# PLL must be used as sysclk, which is the master audio clock.
# The Sparkfun board has the WS pins for RX and TX connected on the
# board. Therefore adc_sync must be set to sync_adc, to configure
# it's ADCLRC pin as input.
from machine import I2C
i2c=I2C(0)
import wm8960
wm=wm8960.WM8960(i2c, sample_rate=44_100,
adc_sync=wm8960.SYNC_ADC,
sysclk_source=wm8960.SYSCLK_PLL,
mclk_freq=24_000_000)
wm.set_volume(wm8960.MODULE_HEADPHONE, 100)

753
drivers/codec/wm8960.py
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@ -0,0 +1,753 @@
#
# Driver class for the WM8960 Codec to be used e.g. with MIMXRT_1xxx Boards.
# Derived from the NXP SDK drivers.
#
# Copyright (c) 2015, Freescale Semiconductor, Inc., (C-Code)
# Copyright 2016-2021 NXP, (C-Code)
# All rights reserved.
#
# Translated to MicroPython by Robert Hammelrath, 2022
#
# SPDX-License-Identifier: BSD-3-Clause
#
import array
from micropython import const
# Define the register addresses of WM8960.
_LINVOL = const(0x0)
_RINVOL = const(0x1)
_LOUT1 = const(0x2)
_ROUT1 = const(0x3)
_CLOCK1 = const(0x4)
_DACCTL1 = const(0x5)
_DACCTL2 = const(0x6)
_IFACE1 = const(0x7)
_CLOCK2 = const(0x8)
_IFACE2 = const(0x9)
_LDAC = const(0xA)
_RDAC = const(0xB)
_RESET = const(0xF)
_3D = const(0x10)
_ALC1 = const(0x11)
_ALC2 = const(0x12)
_ALC3 = const(0x13)
_NOISEG = const(0x14)
_LADC = const(0x15)
_RADC = const(0x16)
_ADDCTL1 = const(0x17)
# Register _ADDCTL2 = const(0x18)
_POWER1 = const(0x19)
_POWER2 = const(0x1A)
_ADDCTL3 = const(0x1B)
# Register _APOP1 = const(0x1C)
# Register _APOP2 = const(0x1D)
_LINPATH = const(0x20)
_RINPATH = const(0x21)
_LOUTMIX = const(0x22)
_ROUTMIX = const(0x25)
_MONOMIX1 = const(0x26)
_MONOMIX2 = const(0x27)
_LOUT2 = const(0x28)
_ROUT2 = const(0x29)
_MONO = const(0x2A)
_INBMIX1 = const(0x2B)
_INBMIX2 = const(0x2C)
_BYPASS1 = const(0x2D)
_BYPASS2 = const(0x2E)
_POWER3 = const(0x2F)
_ADDCTL4 = const(0x30)
_CLASSD1 = const(0x31)
# Register _CLASSD3 = const(0x33)
_PLL1 = const(0x34)
_PLL2 = const(0x35)
_PLL3 = const(0x36)
_PLL4 = const(0x37)
# WM8960 PLLN range */
_PLL_N_MIN_VALUE = const(6)
_PLL_N_MAX_VALUE = const(12)
# WM8960 CLOCK2 bits
_CLOCK2_BCLK_DIV_MASK = const(0x0F)
_CLOCK2_DCLK_DIV_MASK = const(0x1C0)
_CLOCK2_DCLK_DIV_SHIFT = const(0x06)
# Register _IFACE1
_IFACE1_FORMAT_MASK = const(0x03)
_IFACE1_WL_MASK = const(0x0C)
_IFACE1_WL_SHIFT = const(0x02)
_IFACE1_LRP_MASK = const(0x10)
_IFACE1_MS_MASK = const(0x40)
_IFACE1_DLRSWAP_MASK = const(0x20)
_IFACE1_ALRSWAP_MASK = const(0x100)
# Register _POWER1
_POWER1_VREF_MASK = const(0x40)
_POWER1_VREF_SHIFT = const(0x06)
_POWER1_AINL_MASK = const(0x20)
_POWER1_AINR_MASK = const(0x10)
_POWER1_ADCL_MASK = const(0x08)
_POWER1_ADCR_MASK = const(0x0)
_POWER1_MICB_MASK = const(0x02)
_POWER1_MICB_SHIFT = const(0x01)
# Register _POWER2
_POWER2_DACL_MASK = const(0x100)
_POWER2_DACR_MASK = const(0x80)
_POWER2_LOUT1_MASK = const(0x40)
_POWER2_ROUT1_MASK = const(0x20)
_POWER2_SPKL_MASK = const(0x10)
_POWER2_SPKR_MASK = const(0x08)
_POWER3_LMIC_MASK = const(0x20)
_POWER3_RMIC_MASK = const(0x10)
_POWER3_LOMIX_MASK = const(0x08)
_POWER3_ROMIX_MASK = const(0x04)
# Register _DACCTL1 .. 3
_DACCTL1_MONOMIX_MASK = const(0x10)
_DACCTL1_MONOMIX_SHIFT = const(0x4)
_DACCTL1_DACMU_MASK = const(0x08)
_DACCTL1_DEEM_MASK = const(0x06)
_DACCTL1_DEEM_SHIFT = const(0x01)
_DACCTL2_DACSMM_MASK = const(0x08)
_DACCTL2_DACMR_MASK = const(0x04)
_DACCTL3_ALCSR_MASK = const(0x07)
# _WM8060_ALC1 .. 3
_ALC_CHANNEL_MASK = const(0x180)
_ALC_CHANNEL_SHIFT = const(0x7)
_ALC_MODE_MASK = const(0x100)
_ALC_MODE_SHIFT = const(0x8)
_ALC_GAIN_MASK = const(0x70)
_ALC_GAIN_SHIFT = const(0x4)
_ALC_TARGET_MASK = const(0x0F)
_ALC_ATTACK_MASK = const(0x0F)
_ALC_DECAY_MASK = const(0xF0)
_ALC_DECAY_SHIFT = const(4)
_ALC_HOLD_MASK = const(0xF)
# Register _NOISEG
_NOISEG_LEVEL_SHIFT = const(3)
_I2C_ADDR = const(0x1A)
# WM8960 maximum volume values
_MAX_VOLUME_ADC = const(0xFF)
_MAX_VOLUME_DAC = const(0xFF)
_MAX_VOLUME_HEADPHONE = const(0x7F)
_MAX_VOLUME_LINEIN = const(0x3F)
_MAX_VOLUME_SPEAKER = const(0x7F)
# Config symbol names
# Modules
MODULE_ADC = const(0) # ADC module in WM8960
MODULE_DAC = const(1) # DAC module in WM8960
MODULE_VREF = const(2) # VREF module
MODULE_HEADPHONE = const(3) # Headphone
MODULE_MIC_BIAS = const(4) # Mic bias
MODULE_MIC = const(5) # Input Mic
MODULE_LINE_IN = const(6) # Analog in PGA
MODULE_LINE_OUT = const(7) # Line out module
MODULE_SPEAKER = const(8) # Speaker module
MODULE_OMIX = const(9) # Output mixer
MODULE_MONO_OUT = const(10) # Mono mix
# Route
ROUTE_BYPASS = const(0) # LINEIN->Headphone.
ROUTE_PLAYBACK = const(1) # I2SIN->DAC->Headphone.
ROUTE_PLAYBACK_RECORD = const(2) # I2SIN->DAC->Headphone, LINEIN->ADC->I2SOUT.
ROUTE_RECORD = const(5) # LINEIN->ADC->I2SOUT.
# Input
INPUT_CLOSED = const(0) # Input device is closed
INPUT_MIC1 = const(1) # Input as single ended mic, only use L/RINPUT1
INPUT_MIC2 = const(2) # Input as diff. mic, use L/RINPUT1 and L/RINPUT2
INPUT_MIC3 = const(3) # Input as diff. mic, use L/RINPUT1 and L/RINPUT3
INPUT_LINE2 = const(4) # Input as line input, only use L/RINPUT2
INPUT_LINE3 = const(5) # Input as line input, only use L/RINPUT3
# ADC sync input
SYNC_ADC = const(0) # Use ADCLRC pin for ADC sync
SYNC_DAC = const(1) # used DACLRC pin for ADC sync
# Protocol type
BUS_I2S = const(2) # I2S type
BUS_LEFT_JUSTIFIED = const(1) # Left justified mode
BUS_RIGHT_JUSTIFIED = const(0) # Right justified mode
BUS_PCMA = const(3) # PCM A mode
BUS_PCMB = const(3 | (1 << 4)) # PCM B mode
# Channel swap
SWAP_NONE = const(0)
SWAP_INPUT = const(1)
SWAP_OUTPUT = const(2)
# Mute settings
MUTE_FAST = const(0)
MUTE_SLOW = const(1)
# ALC settings
ALC_OFF = const(0)
ALC_RIGHT = const(1)
ALC_LEFT = const(2)
ALC_STEREO = const(3)
ALC_MODE = const(0) # ALC mode
ALC_LIMITER = const(1) # Limiter mode
# Clock Source
SYSCLK_MCLK = const(0) # sysclk source from external MCLK
SYSCLK_PLL = const(1) # sysclk source from internal PLL
class Regs:
# register cache of 56 register. Since registers cannot be read back, they are
# kept in the table for modification
# fmt: off
cache = array.array("H", (
0x0097, 0x0097, 0x0000, 0x0000, 0x0000, 0x0008, 0x0000,
0x000a, 0x01c0, 0x0000, 0x00ff, 0x00ff, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x007b, 0x0100, 0x0032, 0x0000,
0x00c3, 0x00c3, 0x01c0, 0x0000, 0x0000, 0x0000, 0x0000,
0x0000, 0x0000, 0x0000, 0x0000, 0x0100, 0x0100, 0x0050,
0x0050, 0x0050, 0x0050, 0x0000, 0x0000, 0x0000, 0x0000,
0x0040, 0x0000, 0x0000, 0x0050, 0x0050, 0x0000, 0x0002,
0x0037, 0x004d, 0x0080, 0x0008, 0x0031, 0x0026, 0x00e9
))
# fmt: on
def __init__(self, i2c, i2c_address=_I2C_ADDR):
self.value_buffer = bytearray(2)
self.i2c = i2c
self.i2c_address = i2c_address
def __getitem__(self, reg):
return self.cache[reg]
def __setitem__(self, reg, value):
if type(reg) is tuple:
if type(value) is tuple:
self[reg[0]] = value[0]
self[reg[1]] = value[1]
else:
self[reg[0]] = value
self[reg[1]] = value
else:
if type(value) is tuple:
val = (self.cache[reg] & (~value[0] & 0xFFFF)) | value[1]
else:
val = value
self.cache[reg] = val
self.value_buffer[0] = (reg << 1) | ((val >> 8) & 0x01)
self.value_buffer[1] = val & 0xFF
self.i2c.writeto(self.i2c_address, self.value_buffer)
class WM8960:
_bit_clock_divider_table = {
2: 0,
3: 1,
4: 2,
6: 3,
8: 4,
11: 5,
12: 6,
16: 7,
22: 8,
24: 9,
32: 10,
44: 11,
48: 12,
}
_dac_divider_table = {
1.0 * 256: 0b000,
1.5 * 256: 0b001,
2 * 256: 0b010,
3 * 256: 0b011,
4 * 256: 0b100,
5.5 * 256: 0b101,
6 * 256: 0b110,
}
_audio_word_length_table = {
16: 0b00,
20: 0b01,
24: 0b10,
32: 0b11,
}
_alc_sample_rate_table = {
48000: 0,
44100: 0,
32000: 1,
24000: 2,
22050: 2,
16000: 3,
12000: 4,
11025: 4,
8000: 5,
}
_volume_config_table = {
MODULE_ADC: (_MAX_VOLUME_ADC, _LADC, 0x100),
MODULE_DAC: (_MAX_VOLUME_DAC, _LDAC, 0x100),
MODULE_HEADPHONE: (_MAX_VOLUME_HEADPHONE, _LOUT1, 0x180),
MODULE_LINE_IN: (_MAX_VOLUME_LINEIN, _LINVOL, 0x140),
MODULE_SPEAKER: (_MAX_VOLUME_SPEAKER, _LOUT2, 0x180),
}
_input_config_table = {
INPUT_CLOSED: None,
INPUT_MIC1: (0x138, 0x117),
INPUT_MIC2: (0x178, 0x117),
INPUT_MIC3: (0x1B8, 0x117),
INPUT_LINE2: (0, 0xE),
INPUT_LINE3: (0, 0x70),
}
def __init__(
self,
i2c,
sample_rate=16000,
bits=16,
swap=SWAP_NONE,
route=ROUTE_PLAYBACK_RECORD,
left_input=INPUT_MIC3,
right_input=INPUT_MIC2,
sysclk_source=SYSCLK_MCLK,
mclk_freq=None,
primary=False,
adc_sync=SYNC_DAC,
protocol=BUS_I2S,
i2c_address=_I2C_ADDR,
):
self.regs = regs = Regs(i2c, i2c_address)
self.sample_rate = sample_rate
# check parameter consistency and set the sysclk value
if sysclk_source == SYSCLK_PLL:
if sample_rate in (11025, 22050, 44100):
sysclk = 11289600
else:
sysclk = 12288000
if sysclk < sample_rate * 256:
sysclk = sample_rate * 256
if mclk_freq is None:
mclk_freq = sysclk
else: # sysclk_source == SYSCLK_MCLK
if mclk_freq is None:
mclk_freq = sample_rate * 256
sysclk = mclk_freq
regs[_RESET] = 0x00
# VMID=50K, Enable VREF, AINL, AINR, ADCL and ADCR
# I2S_IN (bit 0), I2S_OUT (bit 1), DAP (bit 4), DAC (bit 5), ADC (bit 6) are powered on
regs[_POWER1] = 0xFE
# Enable DACL, DACR, LOUT1, ROUT1, PLL down, SPKL, SPKR
regs[_POWER2] = 0x1F8
# Enable left and right channel input PGA, left and right output mixer
regs[_POWER3] = 0x3C
if adc_sync == SYNC_ADC:
# ADC and DAC use different Frame Clock Pins
regs[_IFACE2] = 0x00 # ADCLRC 0x00:Input 0x40:output.
else:
# ADC and DAC use the same Frame Clock Pin
regs[_IFACE2] = 0x40 # ADCLRC 0x00:Input 0x40:output.
self.set_data_route(route)
self.set_protocol(protocol)
if sysclk_source == SYSCLK_PLL:
self.set_internal_pll_config(mclk_freq, sysclk)
if primary:
self.set_master_clock(sysclk, sample_rate, bits)
# set master bit.
self.regs[_IFACE1] = (0, _IFACE1_MS_MASK)
self.set_speaker_clock(sysclk)
# swap channels
if swap & SWAP_INPUT:
regs[_IFACE1] = (0, _IFACE1_ALRSWAP_MASK)
if swap & SWAP_OUTPUT:
regs[_IFACE1] = (0, _IFACE1_DLRSWAP_MASK)
self.set_left_input(left_input)
self.set_right_input(right_input)
regs[_ADDCTL1] = 0x0C0
regs[_ADDCTL4] = 0x60 # Set GPIO1 to 0.
regs[_BYPASS1] = regs[_BYPASS2] = 0x0
# ADC volume, 0dB
regs[_LADC, _RADC] = 0x1C3
# Digital DAC volume, 0dB
regs[_LDAC, _RDAC] = 0x1FF
# Headphone volume, LOUT1 and ROUT1, 0dB
regs[_LOUT1, _ROUT1] = 0x16F
# speaker volume 6dB
regs[_LOUT2, _ROUT2] = 0x1FF
# enable class D output
regs[_CLASSD1] = 0xF7
# Unmute DAC.
regs[_DACCTL1] = 0x0000
# Input PGA volume 0 dB
regs[_LINVOL, _RINVOL] = 0x117
self.config_data_format(sysclk, sample_rate, bits)
def deinit(self):
self.set_module(MODULE_ADC, False)
self.set_module(MODULE_DAC, False)
self.set_module(MODULE_VREF, False)
self.set_module(MODULE_LINE_IN, False)
self.set_module(MODULE_LINE_OUT, False)
self.set_module(MODULE_SPEAKER, False)
def set_internal_pll_config(self, input_mclk, output_clk):
regs = self.regs
pllF2 = output_clk * 4
pll_prescale = 0
sysclk_div = 1
frac_mode = 0
# disable PLL power
regs[_POWER2] = (1, 0)
regs[_CLOCK1] = (7, 0)
pllN = pllF2 // input_mclk
if pllN < _PLL_N_MIN_VALUE:
input_mclk //= 2
pll_prescale = 1
pllN = pllF2 // input_mclk
if pllN < _PLL_N_MIN_VALUE:
sysclk_div = 2
pllF2 *= 2
pllN = pllF2 // input_mclk
if (pllN < _PLL_N_MIN_VALUE) or (pllN > _PLL_N_MAX_VALUE):
raise ValueError("Invalid MCLK vs. sysclk ratio")
pllK = ((pllF2 % input_mclk) * (1 << 24)) // input_mclk
if pllK != 0:
frac_mode = 1
regs[_PLL1] = (frac_mode << 5) | (pll_prescale << 4) | (pllN & 0x0F)
regs[_PLL2] = (pllK >> 16) & 0xFF
regs[_PLL3] = (pllK >> 8) & 0xFF
regs[_PLL4] = pllK & 0xFF
# enable PLL power
regs[_POWER2] = (1, 1)
regs[_CLOCK1] = (7, ((0 if sysclk_div == 1 else sysclk_div) << 1) | 1)
def set_master_clock(self, sysclk, sample_rate, bit_width):
bit_clock_divider = (sysclk * 2) // (sample_rate * bit_width * 2)
try:
reg_divider = self._bit_clock_divider_table[bit_clock_divider]
except:
raise ValueError("Invalid ratio of sysclk sample rate and bits")
# configure the master bit clock divider
self.regs[_CLOCK2] = (_CLOCK2_BCLK_DIV_MASK, reg_divider)
def set_speaker_clock(self, sysclk):
speaker_divider_table = (1.5, 2, 3, 4, 6, 8, 12, 16)
for val in range(8):
divider = speaker_divider_table[val]
f = sysclk / divider
if 500_000 < f < 1_000_000:
break
else:
val = 7
self.regs[_CLOCK2] = (
_CLOCK2_DCLK_DIV_MASK,
val << _CLOCK2_DCLK_DIV_SHIFT,
)
def set_module(self, module, is_enabled):
is_enabled = 1 if is_enabled else 0
regs = self.regs
if module == MODULE_ADC:
regs[_POWER1] = (
_POWER1_ADCL_MASK | _POWER1_ADCR_MASK,
(_POWER1_ADCL_MASK | _POWER1_ADCR_MASK) * is_enabled,
)
elif module == MODULE_DAC:
regs[_POWER2] = (
_POWER2_DACL_MASK | _POWER2_DACR_MASK,
(_POWER2_DACL_MASK | _POWER2_DACR_MASK) * is_enabled,
)
elif module == MODULE_VREF:
regs[_POWER1] = (
_POWER1_VREF_MASK,
(is_enabled << _POWER1_VREF_SHIFT),
)
elif module == MODULE_LINE_IN:
regs[_POWER1] = (
_POWER1_AINL_MASK | _POWER1_AINR_MASK,
(_POWER1_AINL_MASK | _POWER1_AINR_MASK) * is_enabled,
)
regs[_POWER3] = (
_POWER3_LMIC_MASK | _POWER3_RMIC_MASK,
(_POWER3_LMIC_MASK | _POWER3_RMIC_MASK) * is_enabled,
)
elif module == MODULE_LINE_OUT:
regs[_POWER2] = (
_POWER2_LOUT1_MASK | _POWER2_ROUT1_MASK,
(_POWER2_LOUT1_MASK | _POWER2_ROUT1_MASK) * is_enabled,
)
elif module == MODULE_MIC_BIAS:
regs[_POWER1] = (
_POWER1_MICB_MASK,
(is_enabled << _POWER1_MICB_SHIFT),
)
elif module == MODULE_SPEAKER:
regs[_POWER2] = (
_POWER2_SPKL_MASK | _POWER2_SPKR_MASK,
(_POWER2_SPKL_MASK | _POWER2_SPKR_MASK) * is_enabled,
)
regs[_CLASSD1] = 0xF7
elif module == MODULE_OMIX:
regs[_POWER3] = (
_POWER3_LOMIX_MASK | _POWER3_ROMIX_MASK,
(_POWER3_LOMIX_MASK | _POWER3_ROMIX_MASK) * is_enabled,
)
elif module == MODULE_MONO_OUT:
regs[_MONOMIX1] = regs[_MONOMIX2] = is_enabled << 7
regs[_MONO] = is_enabled << 6
else:
raise ValueError("Invalid module")
def enable_module(self, module):
self.set_module(module, True)
def disable_module(self, module):
self.set_module(module, False)
def set_data_route(self, route):
regs = self.regs
if route == ROUTE_BYPASS:
# Bypass means from line-in to HP
# Left LINPUT3 to left output mixer, LINPUT3 left output mixer volume = 0dB
# Right RINPUT3 to right output mixer, RINPUT3 right output mixer volume = 0dB
regs[_LOUTMIX, _ROUTMIX] = 0x80
elif route == ROUTE_PLAYBACK:
# Data route I2S_IN-> DAC-> HP
#
# Left DAC to left output mixer, LINPUT3 left output mixer volume = 0dB
# Right DAC to right output mixer, RINPUT3 right output mixer volume = 0dB
regs[_LOUTMIX, _ROUTMIX] = 0x100
regs[_POWER3] = 0x0C
# Set power for DAC
self.set_module(MODULE_DAC, True)
self.set_module(MODULE_OMIX, True)
self.set_module(MODULE_LINE_OUT, True)
elif route == ROUTE_PLAYBACK_RECORD:
#
# Left DAC to left output mixer, LINPUT3 left output mixer volume = 0dB
# Right DAC to right output mixer, RINPUT3 right output mixer volume = 0dB
regs[_LOUTMIX, _ROUTMIX] = 0x100
regs[_POWER3] = 0x3C
self.set_module(MODULE_DAC, True)
self.set_module(MODULE_ADC, True)
self.set_module(MODULE_LINE_IN, True)
self.set_module(MODULE_OMIX, True)
self.set_module(MODULE_LINE_OUT, True)
elif route == ROUTE_RECORD:
# LINE_IN->ADC->I2S_OUT
# Left and right input boost, LIN3BOOST and RIN3BOOST = 0dB
regs[_POWER3] = 0x30
# Power up ADC and AIN
self.set_module(MODULE_LINE_IN, True)
self.set_module(MODULE_ADC, True)
else:
raise ValueError("Invalid route")
def set_left_input(self, input):
if not input in self._input_config_table.keys():
raise ValueError("Invalid input")
input = self._input_config_table[input]
regs = self.regs
if input is None:
regs[_POWER1] = (_POWER1_AINL_MASK | _POWER1_ADCL_MASK, 0)
elif input[0] == 0:
regs[_POWER1] = (0, _POWER1_AINL_MASK | _POWER1_ADCL_MASK)
regs[_INBMIX1] = input
else:
regs[_POWER1] = (0, _POWER1_AINL_MASK | _POWER1_ADCL_MASK | _POWER1_MICB_MASK)
regs[_LINPATH] = input[0]
regs[_LINVOL] = input[1]
def set_right_input(self, input):
if not input in self._input_config_table.keys():
raise ValueError("Invalid input name")
input = self._input_config_table[input]
regs = self.regs
if input is None:
regs[_POWER1] = (_POWER1_AINR_MASK | _POWER1_ADCR_MASK, 0)
elif input[0] == 0:
regs[_POWER1] = (0, _POWER1_AINL_MASK | _POWER1_ADCR_MASK)
regs[_INBMIX2] = input
else:
regs[_POWER1] = (0, _POWER1_AINR_MASK | _POWER1_ADCR_MASK | _POWER1_MICB_MASK)
regs[_RINPATH] = input[0]
regs[_RINVOL] = input[1]
def set_protocol(self, protocol):
self.regs[_IFACE1] = (
_IFACE1_FORMAT_MASK | _IFACE1_LRP_MASK,
protocol,
)
def config_data_format(self, sysclk, sample_rate, bits):
# Compute sample rate divider, dac and adc are the same sample rate
try:
divider = self._dac_divider_table[sysclk // sample_rate]
wl = self._audio_word_length_table[bits]
except:
raise ValueError("Invalid ratio sysclk/sample_rate or invalid bit length")
self.regs[_CLOCK1] = (0x1F8, divider << 6 | divider << 3)
self.regs[_IFACE1] = (_IFACE1_WL_MASK, wl << _IFACE1_WL_SHIFT)
def volume(self, module, volume_l=None, volume_r=None):
if not module in self._volume_config_table.keys():
raise ValueError("Invalid module")
if volume_l is None: # get volume
vol_max, regnum, _ = self._volume_config_table[module]
return (
int((self.regs[regnum] & vol_max) * 100 / vol_max + 0.5),
int((self.regs[regnum + 1] & vol_max) * 100 / vol_max + 0.5),
)
else: # set volume
if volume_r is None:
volume_r = volume_l
if not ((0 <= volume_l <= 100) and (0 <= volume_r <= 100)):
raise ValueError("Invalid value for volume")
elif not module in self._volume_config_table.keys():
raise ValueError("Invalid module")
vol_max, regnum, flags = self._volume_config_table[module]
self.regs[regnum] = int(volume_l * vol_max / 100 + 0.5) | flags
self.regs[regnum + 1] = int(volume_r * vol_max / 100 + 0.5) | flags
def mute(self, enable, soft=True, ramp=MUTE_FAST):
enable = _DACCTL1_DACMU_MASK if enable else 0
soft = _DACCTL2_DACSMM_MASK if soft else 0
ramp = _DACCTL2_DACMR_MASK if ramp == MUTE_SLOW else 0
self.regs[_DACCTL1] = (_DACCTL1_DACMU_MASK, enable)
self.regs[_DACCTL2] = (
_DACCTL2_DACSMM_MASK | _DACCTL2_DACMR_MASK,
soft | ramp,
)
def expand_3d(self, depth=0):
depth &= 0x0F
cutoff = 0 if self.sample_rate >= 32000 else 0b1100000
self.regs[_3D] = cutoff | depth << 1 | (1 if depth > 0 else 0)
def mono(self, enable):
enable = 1 if enable else 0
self.regs[_DACCTL1] = (
_DACCTL1_MONOMIX_MASK,
enable << _DACCTL1_MONOMIX_SHIFT,
)
def alc_mode(self, channel, mode=ALC_MODE):
if mode != ALC_MODE:
mode = ALC_LIMITER
channel &= 3
self.regs[_ALC1] = (
_ALC_CHANNEL_MASK,
channel << _ALC_CHANNEL_SHIFT,
)
self.regs[_ALC3] = (_ALC_MODE_MASK, mode << _ALC_MODE_SHIFT)
try:
rate = _alc_sample_rate_table[self.sample_rate]
except:
rate = 0
self.regs[_ADDCTL3] = (_DACCTL3_ALCSR_MASK, rate)
def alc_gain(self, target=-12, max_gain=30, min_gain=-17.25, noise_gate=-78):
def limit(value, minval, maxval):
value = int(value)
if value < minval:
value = minval
if value > maxval:
value = maxval
return value
target = limit((16 + (target * 2) // 3), 0, 15)
max_gain = limit((max_gain + 12) // 6, 0, 7)
min_gain = limit((min_gain * 4 + 69) // 24, 0, 7)
noise_gate = limit((noise_gate * 2 + 153) // 3, -1, 31)
self.regs[_ALC1] = (
_ALC_GAIN_MASK | _ALC_TARGET_MASK,
(max_gain << _ALC_GAIN_SHIFT) | target,
)
self.regs[_ALC2] = (_ALC_GAIN_MASK, (min_gain << _ALC_GAIN_SHIFT))
if noise_gate >= 0:
self.regs[_NOISEG] = noise_gate << _NOISEG_LEVEL_SHIFT | 1
else:
self.regs[_NOISEG] = 0
def alc_time(self, attack=24, decay=192, hold=0):
def logb(value, limit):
value = int(value)
lb = 0
while value > 1:
value >>= 1
lb += 1
if lb > limit:
lb = limit
return lb
attack = logb(attack / 6, 7)
decay = logb(decay / 24, 7)
hold = logb((hold * 3) / 8, 15)
self.regs[_ALC2] = (_ALC_HOLD_MASK, hold)
self.regs[_ALC3] = (
_ALC_DECAY_MASK | _ALC_ATTACK_MASK,
(decay << _ALC_DECAY_SHIFT) | attack,
)
def deemphasis(self, enable):
deem_table = (32000, 44100, 48000)
enable = not not enable
if enable and self.sample_rate in deem_table:
val = deem_table.index(self.sample_rate) + 1
else:
val = 0
self.regs[_DACCTL1] = (_DACCTL1_DEEM_MASK, val << _DACCTL1_DEEM_SHIFT)
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