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wm8960

Classes

WM8960

Create a WM8960 driver object, initialize the device with default settings and return the

Module Contents

class wm8960.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.

alc_gain(target=-12, max_gain=30, min_gain=-17.25, noise_gate=-78) → Incomplete

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.

alc_mode(channel, mode=ALC_MODE) → Incomplete

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.

alc_time(attack=24, decay=192, hold=0) → None

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.

deemphasis(active) → Incomplete: 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.

deinit() → None: Disable all modules.

disable_module(module) → None: Disable a module. For the list of module names, see the table above.

enable_module(module) → None: Enable a module. For the list of module names, see the table above.

expand_3d(level) → None: Enable Stereo 3D expansion. level is a number between 0 and 15. A value of 0 disables the expansion.

mono(active) → Incomplete: 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.

mute(module, mute, soft=True, ramp=MUTE_FAST) → Incomplete

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.

set_data_route(route) → None: Set the audio data route. For the parameter value/names, see the table above.

set_left_input(input_source) → Incomplete: Specify the source for the left input. The input source names are listed above.

set_module(module, active) → None

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.

set_right_input(input_source) → Incomplete: Specify the source for the right input. The input source names are listed above.

volume(module, volume_l=None, volume_r=None) → Incomplete

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.