ARM split - detect USB to select master/slave (#6424)
* Initial split refactor to allow usb master detection * Add split USB detect docs * Add SPLIT_USB_DETECT demo mode limitation * fix rebase issues * clang-format
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@ -267,6 +267,14 @@ There are a few different ways to set handedness for split keyboards (listed in
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* 4: about 26kbps
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* 5: about 20kbps
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* `#define SPLIT_USB_DETECT`
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* Detect (with timeout) USB connection when delegating master/slave
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* Default behavior for ARM
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* Required for AVR Teensy
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* `#define SPLIT_USB_TIMEOUT 2500`
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* Maximum timeout when detecting master/slave when using `SPLIT_USB_DETECT`
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# The `rules.mk` File
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This is a [make](https://www.gnu.org/software/make/manual/make.html) file that is included by the top-level `Makefile`. It is used to set some information about the MCU that we will be compiling for as well as enabling and disabling certain features.
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@ -190,6 +190,18 @@ This sets how many LEDs are directly connected to each controller. The first nu
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?> This setting implies that `RGBLIGHT_SPLIT` is enabled, and will forcibly enable it, if it's not.
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```c
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#define SPLIT_USB_DETECT
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```
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This option changes the startup behavior to detect an active USB connection when delegating master/slave. If this operation times out, then the half is assume to be a slave. This is the default behavior for ARM, and required for AVR Teensy boards (due to hardware limitations).
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?> This setting will stop the ability to demo using battery packs.
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```c
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#define SPLIT_USB_TIMEOUT 2500
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```
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This sets the maximum timeout when detecting master/slave when using `SPLIT_USB_DETECT`.
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## Additional Resources
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Nicinabox has a [very nice and detailed guide](https://github.com/nicinabox/lets-split-guide) for the Let's Split keyboard, that covers most everything you need to know, including troubleshooting information.
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