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The mouse reference is a pointer. If it's NULL, the driver uses a default. If it's non-NULL, then it points to a function that the driver can call. That function will adjust the driver's calibration value. It could ask the user to adjust the pen; or, it could read a file that holds a value from a previous calibration. Application writers can choose how it's done: a function that's provided by the library, a custom function, or nothing.
24 lines
647 B
ArmAsm
24 lines
647 B
ArmAsm
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; Pointer for library references by device drivers.
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; 2013-06-23, Greg King
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.export mouse_libref, _mouse_adjuster
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.data
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mouse_libref: ; generic label for mouse-kernel
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; A program optionally can set this pointer to a function that gives
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; a calibration value to a driver. If this pointer isn't NULL,
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; then a driver that wants a value can call that function.
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; The function might read a value from a file; or, it might ask the user
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; to help calibrate the driver.
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; void __fastcall__ (*mouse_adjuster)(unsigned char *) = NULL;
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;
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_mouse_adjuster:
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.addr $0000
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