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added rounding to sin8_t

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thx to @softhack007
This commit is contained in:
Damian Schneider 2024-10-06 21:27:58 +02:00
parent 7b855c851d
commit f301296f1e
1 changed files with 2 additions and 2 deletions
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wled00/wled_math.cpp
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@ -77,8 +77,8 @@ int16_t cos16_t(uint16_t theta) {
uint8_t sin8_t(uint8_t theta) { uint8_t sin8_t(uint8_t theta) {
int32_t sin16 = sin16_t((uint16_t)theta * 257); // 255 * 257 = 0xFFFF int32_t sin16 = sin16_t((uint16_t)theta * 257); // 255 * 257 = 0xFFFF
sin16 += 0x7FFF; //shift result to range 0-0xFFFF sin16 += 0x7FFF + 128; //shift result to range 0-0xFFFF, +128 for rounding
return sin16 >> 8; return min(sin16, int32_t(0xFFFF)) >> 8; // min performs saturation, and prevents overflow
} }
uint8_t cos8_t(uint8_t theta) { uint8_t cos8_t(uint8_t theta) {