43 lines
1016 B
C
43 lines
1016 B
C
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/**
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* Example for a interpolated sine/cosine table lookup
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*
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* @file sin1.h
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* @author stfwi
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*
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*/
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#ifndef __SW__SIN1_H__
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#define __SW__SIN1_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <sys/types.h>
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/**
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* Sine calculation using interpolated table lookup.
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* Instead of radiants or degrees we use "turns" here. Means this
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* sine does NOT return one phase for 0 to 2*PI, but for 0 to 1.
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* Input: -1 to 1 as int16 Q15 == -32768 to 32767.
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* Output: -1 to 1 as int16 Q15 == -32768 to 32767.
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*
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* @param int16_t angle Q15
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* @return int16_t Q15
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*/
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int16_t sin1(int16_t angle);
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/**
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* Cosine calculation using interpolated table lookup.
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* Instead of radiants or degrees we use "turns" here. Means this
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* cosine does NOT return one phase for 0 to 2*PI, but for 0 to 1.
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* Input: -1 to 1 as int16 Q15 == -32768 to 32767.
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* Output: -1 to 1 as int16 Q15 == -32768 to 32767.
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*
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* @param int16_t angle Q15
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* @return int16_t Q15
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*/
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int16_t cos1(int16_t angle);
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#ifdef __cplusplus
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}
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#endif
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#endif
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