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fix power calculation for NeoPixelBusLg

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power estimation results from estimateCurrentAndLimitBri() were too low (example: estimated 1.3Amp, measured 1.6Amp). This change corrects the power calculation. Due to the changed behavior of getPixelColor, powerSum must be used as-is, not scaled down again by brightness.
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Frank
2023-07-06 19:06:31 +02:00
parent 196779ffb6
commit 788a276616
1 changed files with 5 additions and 3 deletions
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8
wled00/FX_fcn.cpp
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@@ -1223,7 +1223,8 @@ void WS2812FX::estimateCurrentAndLimitBri() {
}
uint32_t powerSum0 = powerSum;
powerSum *= _brightness;
//powerSum *= _brightness; // for NPBrightnessBus
powerSum *= 255; // no need to scale down powerSum - NPB-LG getPixelColor returns colors scaled down by brightness
if (powerSum > powerBudget) //scale brightness down to stay in current limit
{
@@ -1232,9 +1233,10 @@ void WS2812FX::estimateCurrentAndLimitBri() {
uint8_t scaleB = (scaleI > 255) ? 255 : scaleI;
uint8_t newBri = scale8(_brightness, scaleB);
// to keep brightness uniform, sets virtual busses too - softhack007: apply reductions immediately
if (scaleB < 255) busses.setBrightness(scaleB, true); // NPB-LG has already applied brightness, so its suffifient to post-apply scaling
if (scaleB < 255) busses.setBrightness(scaleB, true); // NPB-LG has already applied brightness, so its suffifient to post-apply scaling ==> use scaleB instead of newBri
busses.setBrightness(newBri, false); // set new brightness for next frame
currentMilliamps = (powerSum0 * newBri) / puPerMilliamp;
//currentMilliamps = (powerSum0 * newBri) / puPerMilliamp; // for NPBrightnessBus
currentMilliamps = (powerSum0 * scaleB) / puPerMilliamp; // for NPBus-LG
} else {
currentMilliamps = powerSum / puPerMilliamp;
busses.setBrightness(_brightness, false); // set new brightness for next frame