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- /**
- * @file lv_trigo.c
- * Basic trigonometric integer functions
- */
- /*********************
- * INCLUDES
- *********************/
- #include "lv_trigo.h"
- /*********************
- * DEFINES
- *********************/
- /**********************
- * TYPEDEFS
- **********************/
- /**********************
- * STATIC PROTOTYPES
- **********************/
- /**********************
- * STATIC VARIABLES
- **********************/
- static int16_t sin0_90_table[] =
- {
- 0, 572, 1144, 1715, 2286, 2856, 3425, 3993, 4560, 5126,
- 5690, 6252, 6813, 7371, 7927, 8481, 9032, 9580, 10126, 10668,
- 11207, 11743, 12275, 12803, 13328, 13848, 14364, 14876, 15383, 15886,
- 16383, 16876, 17364, 17846, 18323, 18794, 19260, 19720, 20173, 20621,
- 21062, 21497, 21925, 22347, 22762, 23170, 23571, 23964, 24351, 24730,
- 25101, 25465, 25821, 26169, 26509, 26841, 27165, 27481, 27788, 28087,
- 28377, 28659, 28932, 29196, 29451, 29697, 29934, 30162, 30381, 30591,
- 30791, 30982, 31163, 31335, 31498, 31650, 31794, 31927, 32051, 32165,
- 32269, 32364, 32448, 32523, 32587, 32642, 32687, 32722, 32747, 32762
- };
- /**********************
- * MACROS
- **********************/
- /**********************
- * GLOBAL FUNCTIONS
- **********************/
- /**
- * Return with sinus of an angle
- * @param angle
- * @return sinus of 'angle'. sin(-90) = -32767, sin(90) = 32767
- */
- int16_t lv_trigo_sin(int16_t angle)
- {
- int16_t ret = 0;
- angle = angle % 360;
- if(angle < 0) angle = 360 + angle;
- if(angle < 90){
- ret = sin0_90_table[angle];
- } else if(angle >= 90 && angle < 180)
- {
- angle = 179 - angle;
- ret = sin0_90_table[angle];
- } else if(angle >= 180 && angle < 270)
- {
- angle = angle - 180;
- ret = - sin0_90_table[angle];
- } else { /*angle >=270*/
- angle = 359 - angle;
- ret = - sin0_90_table[angle];
- }
- return ret;
- }
- /**********************
- * STATIC FUNCTIONS
- **********************/
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