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70 lines
3.0 KiB
Markdown
70 lines
3.0 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/M62429/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/M62429/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/M62429/blob/master/LICENSE)
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[](https://github.com/RobTillaart/M62429/releases)
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# M62429
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Arduino library for M62429 volume control IC.
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## Description
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This library is used to set the attenuation (volume) of the
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M62429 IC a.k.a. FM62429.
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The communication needs a minimum delay of 1.6 microseconds.
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This is defined in the library in **M62429_CLOCK_DELAY** == 2
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For AVR (UNO, slow device) it is defined as 0, as the digitalWrite
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takes time enough.
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For faster processors this define can be overruled runtime by setting it
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before including "M62429.h" or by defining it as command line parameter.
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## Interface
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The interface is straightforward
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- **void begin(uint8_t dataPin, uint8_t clockPin)** defines the clock and data pin.
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One has to create one object per IC.
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- **int getVolume(uint8_t channel)** channel is 0 or 1 or 2 (both). In the latter
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case the volume of channel 0 is used as volume of both channels.
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- **int setVolume(uint8_t channel, uint8_t volume)**
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channel = { 0, 1, 2 = both; volume = {0 .. 255 }
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- **void incr()** increment volume of both channels until max is reached.
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This is another way to set volume that is better suited for a rotary
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encoder or a \[+\] button
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- **void decr()** decrement volume of both channels until 0 is reached. See **incr()**.
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- **void average()** averages the 2 channels to same = average level.
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Sort of set balance in the middle functionality.
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- **void muteOn()** silences both channels but remembers the volume..
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GetVolume() will return the 'saved' volume value.
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- **void muteOff()** resets the volume per channel again.
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- **bool isMuted()** returns the muted state.
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## Operation
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See examples
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## Future
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- Control multiple M62429 IC's with one class. This could work with one
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shared dataPin and one clockPin per IC. An idea might be to use one PCF8575
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to have 1 dataPin and 15 clockPins. That would allow for 15 stereo channels
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or 30 mono channels. Runtime configuration mono / stereo would be cool.
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- model with one **volume(0..100%)** and one **balance(-100..100)**.
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Also a **left()** and **right()** incremental balance might be added.
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This could work better than 2 separate volume channels.
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- change **getVolume(both)** to return max of the two channels?
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- **muteOff()** should increase gradually.
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- **Mute()** could be per channel, default = both / all.
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- **mute50()** reduces levels with 50% (rounded down?).
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- find a big can filled with time ...
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