Detailed Description

General purpose wave generator functions.

Functions
LIB8STATIC uint8_t	triwave8 (uint8_t in)
	Triangle wave generator.

LIB8STATIC uint8_t	quadwave8 (uint8_t in)
	Quadratic waveform generator.

LIB8STATIC uint8_t	cubicwave8 (uint8_t in)
	Cubic waveform generator.

LIB8STATIC uint8_t	squarewave8 (uint8_t in, uint8_t pulsewidth=128)
	Square wave generator.

Function Documentation

◆ cubicwave8()

LIB8STATIC uint8_t cubicwave8 ( uint8_t in )

Cubic waveform generator.

Spends visibly more time at the limits than "sine" does. Spends just a little more time at the limits than "sine" does.

S-shaped wave generator (like "sine"). Useful for turning a one-byte "counter" value into a one-byte oscillating value that moves smoothly up and down, with an "acceleration" and "deceleration" curve.

This is even faster than "sin8()", and has a slightly different curve shape.

Definition at line 779 of file lib8tion.h.

◆ quadwave8()

LIB8STATIC uint8_t quadwave8 ( uint8_t in )

Quadratic waveform generator.

Spends just a little more time at the limits than "sine" does.

S-shaped wave generator (like "sine"). Useful for turning a one-byte "counter" value into a one-byte oscillating value that moves smoothly up and down, with an "acceleration" and "deceleration" curve.

This is even faster than "sin8()", and has a slightly different curve shape.

Definition at line 771 of file lib8tion.h.

◆ squarewave8()

LIB8STATIC uint8_t squarewave8	(	uint8_t	in,
		uint8_t	pulsewidth = 128 )

Square wave generator.

Useful for turning a one-byte ever-increasing value into a one-byte value that is either 0 or 255. The width of the output "pulse" is determined by the pulsewidth argument:

if pulsewidth is 255, output is always 255.
if pulsewidth < 255, then
  if input < pulsewidth  then output is 255
  if input >= pulsewidth then output is 0

The output looking like:

255   +--pulsewidth--+
 .    |              |
 0    0              +--------(256-pulsewidth)--------

Parameters

in	input value
pulsewidth	width of the output pulse

Returns: square wave output

Definition at line 808 of file lib8tion.h.

◆ 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.