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-rw-r--r--lib/lib8tion/random8.h94
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diff --git a/lib/lib8tion/random8.h b/lib/lib8tion/random8.h
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+#ifndef __INC_LIB8TION_RANDOM_H
+#define __INC_LIB8TION_RANDOM_H
+///@ingroup lib8tion
+
+///@defgroup Random Fast random number generators
+/// Fast 8- and 16- bit unsigned random numbers.
+/// Significantly faster than Arduino random(), but
+/// also somewhat less random. You can add entropy.
+///@{
+
+// X(n+1) = (2053 * X(n)) + 13849)
+#define FASTLED_RAND16_2053 ((uint16_t)(2053))
+#define FASTLED_RAND16_13849 ((uint16_t)(13849))
+
+/// random number seed
+extern uint16_t rand16seed;// = RAND16_SEED;
+
+/// Generate an 8-bit random number
+LIB8STATIC uint8_t random8(void)
+{
+ rand16seed = (rand16seed * FASTLED_RAND16_2053) + FASTLED_RAND16_13849;
+ // return the sum of the high and low bytes, for better
+ // mixing and non-sequential correlation
+ return (uint8_t)(((uint8_t)(rand16seed & 0xFF)) +
+ ((uint8_t)(rand16seed >> 8)));
+}
+
+/// Generate a 16 bit random number
+LIB8STATIC uint16_t random16(void)
+{
+ rand16seed = (rand16seed * FASTLED_RAND16_2053) + FASTLED_RAND16_13849;
+ return rand16seed;
+}
+
+/// Generate an 8-bit random number between 0 and lim
+/// @param lim the upper bound for the result
+LIB8STATIC uint8_t random8_max(uint8_t lim)
+{
+ uint8_t r = random8();
+ r = (r*lim) >> 8;
+ return r;
+}
+
+/// Generate an 8-bit random number in the given range
+/// @param min the lower bound for the random number
+/// @param lim the upper bound for the random number
+LIB8STATIC uint8_t random8_min_max(uint8_t min, uint8_t lim)
+{
+ uint8_t delta = lim - min;
+ uint8_t r = random8_max(delta) + min;
+ return r;
+}
+
+/// Generate an 16-bit random number between 0 and lim
+/// @param lim the upper bound for the result
+LIB8STATIC uint16_t random16_max(uint16_t lim)
+{
+ uint16_t r = random16();
+ uint32_t p = (uint32_t)lim * (uint32_t)r;
+ r = p >> 16;
+ return r;
+}
+
+/// Generate an 16-bit random number in the given range
+/// @param min the lower bound for the random number
+/// @param lim the upper bound for the random number
+LIB8STATIC uint16_t random16_min_max( uint16_t min, uint16_t lim)
+{
+ uint16_t delta = lim - min;
+ uint16_t r = random16_max(delta) + min;
+ return r;
+}
+
+/// Set the 16-bit seed used for the random number generator
+LIB8STATIC void random16_set_seed(uint16_t seed)
+{
+ rand16seed = seed;
+}
+
+/// Get the current seed value for the random number generator
+LIB8STATIC uint16_t random16_get_seed(void)
+{
+ return rand16seed;
+}
+
+/// Add entropy into the random number generator
+LIB8STATIC void random16_add_entropy(uint16_t entropy)
+{
+ rand16seed += entropy;
+}
+
+///@}
+
+#endif