25 lines
1.2 KiB
C
25 lines
1.2 KiB
C
#ifndef MATH_H
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#define MATH_H
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int fastMap1023toX(int, int);
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unsigned long percentage(byte, unsigned long);
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inline long powint(int, unsigned int);
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int divs100(long);
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unsigned long divu100(unsigned long);
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#define DIV_ROUND_CLOSEST(n, d) ((((n) < 0) ^ ((d) < 0)) ? (((n) - (d)/2)/(d)) : (((n) + (d)/2)/(d)))
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//This is a dedicated function that specifically handles the case of mapping 0-1023 values into a 0 to X range
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//This is a common case because it means converting from a standard 10-bit analog input to a byte or 10-bit analog into 0-511 (Eg the temperature readings)
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#if defined(_VARIANT_ARDUINO_STM32_) //libmaple //ST stm32duino core returns 0 - 1023 for analog read first use analogReadResolution(12); to make it 12 bit
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#define fastMap1023toX(x, out_max) ( ((unsigned long)x * out_max) >> 12)
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//This is a new version that allows for out_min
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#define fastMap10Bit(x, out_min, out_max) ( ( ((unsigned long)x * (out_max-out_min)) >> 12 ) + out_min)
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#else
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#define fastMap1023toX(x, out_max) ( ((unsigned long)x * out_max) >> 10)
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//This is a new version that allows for out_min
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#define fastMap10Bit(x, out_min, out_max) ( ( ((unsigned long)x * (out_max-out_min)) >> 10 ) + out_min)
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#endif
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#endif
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