From 90eb3a0b79bfef67c70dc545b49c48928eea05f4 Mon Sep 17 00:00:00 2001 From: Josh Rahm Date: Mon, 27 Sep 2021 22:56:46 -0600 Subject: Completed ws2812b 2020 Christmas Lights. --- include/shared/math.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 include/shared/math.h (limited to 'include/shared/math.h') diff --git a/include/shared/math.h b/include/shared/math.h new file mode 100644 index 0000000..6aec0e7 --- /dev/null +++ b/include/shared/math.h @@ -0,0 +1,19 @@ +#ifndef _SHARED_MATH_H_ +#define _SHARED_MATH_H_ + +#include "kern/common.h" + +/* Returns round(sin(2πn / 256) * 127.5 + 127.5). */ +uint8_t byte_sin(uint8_t n); + +static inline uint8_t byte_scale(uint8_t n, uint8_t sc) { + return n * sc / 255; +} + +#define min(a, b) (a) < (b) ? (a) : (b) +#define max(a, b) (a) > (b) ? (a) : (b) + +/* returns (in / 256)^n * 256. */ +uint8_t amp(uint8_t in, uint8_t n); + +#endif /* _SHARED_MATH_H_ */ -- cgit