diff options
| author | cbdev <cb@cbcdn.com> | 2019-08-01 20:54:17 +0200 |
|---|---|---|
| committer | cbdev <cb@cbcdn.com> | 2019-08-01 20:54:17 +0200 |
| commit | a23ce7718ab61e73586d2738329d6bbace0b764b (patch) | |
| tree | af922cd4801b299067d0b871b687de6474a4d4e6 /backends/evdev.md | |
| parent | 4e604b493e0dc855b6ea6978e5cf8e2de5d2b8d5 (diff) | |
| download | midimonster-a23ce7718ab61e73586d2738329d6bbace0b764b.tar.gz midimonster-a23ce7718ab61e73586d2738329d6bbace0b764b.tar.bz2 midimonster-a23ce7718ab61e73586d2738329d6bbace0b764b.zip | |
Implement evdev relative axis inversion
Diffstat (limited to 'backends/evdev.md')
| -rw-r--r-- | backends/evdev.md | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/backends/evdev.md b/backends/evdev.md index 995b44c..88dfc85 100644 --- a/backends/evdev.md +++ b/backends/evdev.md @@ -38,12 +38,18 @@ If an axis is not used for output, this configuration can be omitted. For real devices, all of these parameters for every axis can be found by running `evtest` on the device. To use the input from relative axes in absolute-value based protocols, the backend needs a reference frame to -convert the relative movements to absolute values. +convert the relative movements to absolute values. To invert the mapping of the relative axis, specify the `max` value +as a negative number, for example: + +``` +relaxis.REL_X = -1024 512 +``` If relative axes are used without specifying their extents, the channel will generate normalized values of `0`, `0.5` and `1` for any input less than, equal to and greater than `0`, respectively. As for output, only the values `-1`, `0` and `1` are generated for the same interval. + #### Channel specification A channel is specified by its event type and event code, separated by `.`. For a complete list of event types and codes |