Fix lower cpi bound on PMW33XX #22108
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Move subtraction after CONSTRAIN to prevent unsigned int wrap These sensors expect a value between `0` and `CPI_MAX/CPI_STEP - 1` Subtracting 1 from `cpi/CPI_STEP` within the `CONSTRAIN` macro causes a wrap to the maximum when attempting to set `cpi` less than `CPI_STEP`. Setting the bounds for `CONSTRAIN` to be between `1` and `CPI_MAX/CPI_STEP` allows impossibly small `cpi` values to be set to the minumum CPI of the sensor, instead of the maximum.
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@drashna Seems like just the PMW33XX sensors are affected by this. Didn't notice similar handling in the other sensors. |
drashna
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Move subtraction after
CONSTRAINto prevent unsigned int wrap on PMW3320, PMW3360, PMW3389Description
These sensors expect a value between
0andCPI_MAX/CPI_STEP - 1Subtracting 1 fromcpi/CPI_STEPwithin theCONSTRAINmacro causes a wrap to the maximum when attempting to setcpiless thanCPI_STEP.Setting the bounds for
CONSTRAINto be between1andCPI_MAX/CPI_STEPallows impossibly smallcpivalues to be set to the minumum CPI of the sensor, instead of the maximum.Tested on Ploopy Classic Trackball (PMW3360)
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