Completed ws2812b 2020 Christmas Lights.ir_leds

1 files changed, 19 insertions, 0 deletions

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_ */