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int32 fix to mapping logic

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This commit is contained in:
Adam Martini 2020-06-23 13:33:25 -07:00
parent 5961800fe0
commit b414aa755d
1 changed files with 3 additions and 3 deletions
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6
src/lv_misc/lv_math.c
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@ -241,10 +241,10 @@ int64_t _lv_pow(int64_t base, int8_t exp)
*/
LV_ATTRIBUTE_FAST_MEM int16_t _lv_map(int16_t x, int16_t min_in, int16_t max_in, int16_t min, int16_t max)
{
uint32_t slope = ((uint32_t)(max - min) * 1000) / (uint32_t)(max_in - min_in); /** times 1000 to avoid rounding errors*/
uint32_t bias = min - (slope * min_in) / 1000;
int32_t slope = ((int32_t)(max - min) * 10000) / (int32_t)(max_in - min_in); /** times 10000 to avoid rounding errors*/
int32_t bias = (int32_t)(min * 10000) - slope * min_in;
return bias + (slope * x) / 1000;
return (bias + slope * x) / 10000;
}
/**********************