sc7-nametag-firmware/include/sin1.h

43 lines
1016 B
C

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