triwave8()

LIB8STATIC fl::u8 triwave8

(

fl::u8

in

)

Triangle wave generator.

Useful for turning a one-byte ever-increasing value into a one-byte value that oscillates up and down.

input         output
0..127        0..254 (positive slope)
128..255      254..0 (negative slope)

On AVR this function takes just three cycles.

Definition at line 677 of file lib8tion.h.

{
    if( in & 0x80) {
        in = 255 - in;
    }
    fl::u8 out = in << 1;
    return out;
}

References LIB8STATIC.

Referenced by cubicwave8(), and quadwave8().

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