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https://github.com/openstenoproject/qmk
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36 lines
1.4 KiB
Markdown
36 lines
1.4 KiB
Markdown
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## Digitizer
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The digitizer HID interface allows setting the mouse cursor position at absolute coordinates, unlike the Pointing Device feature that applies relative displacements.
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To enable the digitizer interface, add the following line to your rules.mk:
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```makefile
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DIGITIZER_ENABLE = yes
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```
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In order to change the mouse cursor position from your keymap.c file, include the digitizer header :
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```c
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#include "digitizer.h"
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```
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This gives you access to the `digitizer` structure which members allow you to change the cursor position.
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The coordinates are normalized, meaning there value must be set between 0 and 1. For the `x` coordinate, the value `0` is the leftmost position, whereas the value `1` is the rightmost position.
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For the `y` coordinate, `0` is at the top and `1` at the bottom.
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Here is an example setting the cursor in the middle of the screen:
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```c
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digitizer_t digitizer;
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digitizer.x = 0.5;
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digitizer.y = 0.5;
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digitizer.tipswitch = 0;
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digitizer.inrange = 1;
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digitizer_set_report(digitizer);
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```
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The `tipswitch` member triggers what equates to a click when set to `1`. The `inrange` member is required for the change in coordinates to be taken. It can then be set to `0` in a new report to signal the end of the digitizer interaction, but it is not strictly required.
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Once all members are set to the desired value, the `status` member needs its bitmask `DZ_UPDATED` to be set so the report is sent during the next main loop iteration.
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