triwave8()

LIB8STATIC uint8_t triwave8

(

uint8_t

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 746 of file lib8tion.h.

{
    if( in & 0x80) {
        in = 255 - in;
    }
    uint8_t out = in << 1;
    return out;
}

References LIB8STATIC.

Referenced by cubicwave8(), and quadwave8().

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