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Code Issues Wiki Activity

Simplify Fixed point Math notations

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This commit is contained in:
borisbstyle 2016-03-03 16:17:10 +01:00
parent 431ca856cf
commit 257865cff2
5 changed files with 25 additions and 38 deletions
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13
src/main/common/maths.c
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@ -338,15 +338,14 @@ void arraySubInt32(int32_t *dest, int32_t *array1, int32_t *array2, int count)
}
}
int16_t qPercent(q_number_t q) {
return 100 * q.num / q.den;
int16_t qPercent(fix12_t q) {
return (100 * q) >> 12;
}
int16_t qMultiply(q_number_t q, int16_t input) {
return input * q.num / q.den;
int16_t qMultiply(fix12_t q, int16_t input) {
return (input * q) >> 12;
}
void qConstruct(q_number_t *qNumber, int16_t num, int16_t den, int qType) {
qNumber->num = (1 << qType) / den;
qNumber->den = (1 << qType) / num;
fix12_t qConstruct(int16_t num, int16_t den) {
return (num << 12) / den;
}