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Greatly reduces error rate (half, or 0 zero errors, depends on in/out ranges) for round-trip mapping at the same performance. (#3655)

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(Based on "improved_map" from ESP8266's Servo.cpp)
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Dirk O. Kaar 2020-09-30 13:28:51 +02:00 committed by GitHub
parent 5999b7ba46
commit ab23e8a656
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1 changed files with 5 additions and 5 deletions
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cores/esp32/WMath.cpp
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@ -66,11 +66,11 @@ long random(long howsmall, long howbig)
} }
long map(long x, long in_min, long in_max, long out_min, long out_max) { long map(long x, long in_min, long in_max, long out_min, long out_max) {
long divisor = (in_max - in_min); const long dividend = out_max - out_min;
if(divisor == 0){ const long divisor = in_max - in_min;
return -1; //AVR returns -1, SAM returns 0 const long delta = x - in_min;
}
return (x - in_min) * (out_max - out_min) / divisor + out_min; return (delta * dividend + (divisor / 2)) / divisor + out_min;
} }
unsigned int makeWord(unsigned int w) unsigned int makeWord(unsigned int w)