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Workaround Fan PercentSetting floating point precision error after "ceil()" #27912

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merged 4 commits into from
Jul 13, 2023
Merged

Workaround Fan PercentSetting floating point precision error after "ceil()" #27912

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90810fe
Workaround Fan Percent Setting floating point err
erwinpan1 Jul 12, 2023
0040b88
Restyled by clang-format
restyled-commits Jul 12, 2023
fdc74b5
Workaround Fan PercentSetting float error (2nd)
erwinpan1 Jul 13, 2023
66262a3
Update src/app/clusters/fan-control-server/fan-control-server.cpp
andy31415 Jul 13, 2023
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5 changes: 3 additions & 2 deletions src/app/clusters/fan-control-server/fan-control-server.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -346,8 +346,9 @@ void MatterFanControlClusterServerAttributeChangedCallback(const app::ConcreteAt
VerifyOrReturn(EMBER_ZCL_STATUS_SUCCESS == status,
ChipLogError(Zcl, "Failed to get SpeedSetting with error: 0x%02x", status));

float percent = percentSetting.Value();
uint8_t speedSetting = static_cast<uint8_t>(ceil(speedMax * (percent * 0.01)));
uint16_t percent = percentSetting.Value();
// Plus 99 then integer divide by 100 instead of multiplying 0.01 to avoid floating point precision error
uint8_t speedSetting = static_cast<uint8_t>((speedMax * percent + 99) / 100);

if (currentSpeedSetting.IsNull() || speedSetting != currentSpeedSetting.Value())
{
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