本文主要是介绍通用MCU使用查表计算正弦值sin和查看计算时间，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
生成SIN_COS_TABLE
四分之一周期为256个点
#include <stdio.h>
#include <math.h>#define POINT_NUM 256
#define PI 3.141592fint main()
{for (int i = 0; i < POINT_NUM; i++) {printf("[ %d:\t0x%04X ]", i, (unsigned int)(sin(i*PI/2 / POINT_NUM) * 32768));if((i+1) % 8 == 0){printf("\r\n");}}}
通过查表计算sin和cos
#define SIN_MASK 0x0300u
#define U0_90 0x0200u
#define U90_180 0x0300u
#define U180_270 0x0000u
#define U270_360 0x0100u
typedef unsigned char uint8_t;
typedef short int int16_t ;
typedef int int32_t ;
typedef unsigned short int uint16_t;#define SIN_COS_TABLE {\0x0000,0x00C9,0x0192,0x025B,0x0324,0x03ED,0x04B6,0x057F,\0x0648,0x0711,0x07D9,0x08A2,0x096A,0x0A33,0x0AFB,0x0BC4,\0x0C8C,0x0D54,0x0E1C,0x0EE3,0x0FAB,0x1072,0x113A,0x1201,\0x12C8,0x138F,0x1455,0x151C,0x15E2,0x16A8,0x176E,0x1833,\0x18F9,0x19BE,0x1A82,0x1B47,0x1C0B,0x1CCF,0x1D93,0x1E57,\0x1F1A,0x1FDD,0x209F,0x2161,0x2223,0x22E5,0x23A6,0x2467,\0x2528,0x25E8,0x26A8,0x2767,0x2826,0x28E5,0x29A3,0x2A61,\0x2B1F,0x2BDC,0x2C99,0x2D55,0x2E11,0x2ECC,0x2F87,0x3041,\0x30FB,0x31B5,0x326E,0x3326,0x33DF,0x3496,0x354D,0x3604,\0x36BA,0x376F,0x3824,0x38D9,0x398C,0x3A40,0x3AF2,0x3BA5,\0x3C56,0x3D07,0x3DB8,0x3E68,0x3F17,0x3FC5,0x4073,0x4121,\0x41CE,0x427A,0x4325,0x43D0,0x447A,0x4524,0x45CD,0x4675,\0x471C,0x47C3,0x4869,0x490F,0x49B4,0x4A58,0x4AFB,0x4B9D,\0x4C3F,0x4CE0,0x4D81,0x4E20,0x4EBF,0x4F5D,0x4FFB,0x5097,\0x5133,0x51CE,0x5268,0x5302,0x539B,0x5432,0x54C9,0x5560,\0x55F5,0x568A,0x571D,0x57B0,0x5842,0x58D3,0x5964,0x59F3,\0x5A82,0x5B0F,0x5B9C,0x5C28,0x5CB3,0x5D3E,0x5DC7,0x5E4F,\0x5ED7,0x5F5D,0x5FE3,0x6068,0x60EB,0x616E,0x61F0,0x6271,\0x62F1,0x6370,0x63EE,0x646C,0x64E8,0x6563,0x65DD,0x6656,\0x66CF,0x6746,0x67BC,0x6832,0x68A6,0x6919,0x698B,0x69FD,\0x6A6D,0x6ADC,0x6B4A,0x6BB7,0x6C23,0x6C8E,0x6CF8,0x6D61,\0x6DC9,0x6E30,0x6E96,0x6EFB,0x6F5E,0x6FC1,0x7022,0x7083,\0x70E2,0x7140,0x719D,0x71F9,0x7254,0x72AE,0x7307,0x735E,\0x73B5,0x740A,0x745F,0x74B2,0x7504,0x7555,0x75A5,0x75F3,\0x7641,0x768D,0x76D8,0x7722,0x776B,0x77B3,0x77FA,0x783F,\0x7884,0x78C7,0x7909,0x794A,0x7989,0x79C8,0x7A05,0x7A41,\0x7A7C,0x7AB6,0x7AEE,0x7B26,0x7B5C,0x7B91,0x7BC5,0x7BF8,\0x7C29,0x7C59,0x7C88,0x7CB6,0x7CE3,0x7D0E,0x7D39,0x7D62,\0x7D89,0x7DB0,0x7DD5,0x7DFA,0x7E1D,0x7E3E,0x7E5F,0x7E7E,\0x7E9C,0x7EB9,0x7ED5,0x7EEF,0x7F09,0x7F21,0x7F37,0x7F4D,\0x7F61,0x7F74,0x7F86,0x7F97,0x7FA6,0x7FB4,0x7FC1,0x7FCD,\0x7FD8,0x7FE1,0x7FE9,0x7FF0,0x7FF5,0x7FF9,0x7FFD,0x7FFE}const int16_t hSin_Cos_Table[256] = SIN_COS_TABLE;typedef struct
{int16_t hCos;int16_t hSin;
} Trig_Components;/*** @brief 函数计算cos和sin的值* @param hAngle: q15格式的角度值 (-1~0.9999)* @retval */
Trig_Components trig_functions( int16_t hAngle )
{int32_t shindex;uint16_t uhindex;Trig_Components Local_Components;//10 位index计算shindex = ( ( int32_t )32768 + ( int32_t )hAngle );uhindex = ( uint16_t )shindex;//uhindex /= ( uint16_t )64;uhindex = uhindex >> 6;/**| hAngle | angle | std || (0,16384] | U0_90 | (0,0.5] || (16384,32767] | U90_180 | (0.5,0.99]|| (-16384,-1] | U270_360 | (0,-0.5] || (-16384,-32768] | U180_270 | (-0.5,-1) |*/switch ( ( uint16_t )( uhindex ) & SIN_MASK ){case U0_90:Local_Components.hSin =hSin_Cos_Table[( uint8_t )( uhindex )];Local_Components.hCos =hSin_Cos_Table[( uint8_t )( 0xFFu - ( uint8_t )( uhindex ) )];break;case U90_180:Local_Components.hSin =hSin_Cos_Table[( uint8_t )( 0xFFu - ( uint8_t )( uhindex ) )];Local_Components.hCos =-hSin_Cos_Table[( uint8_t )( uhindex )];break;case U180_270:Local_Components.hSin =-hSin_Cos_Table[( uint8_t )( uhindex )];Local_Components.hCos =-hSin_Cos_Table[( uint8_t )( 0xFFu - ( uint8_t )( uhindex ) )];break;case U270_360:Local_Components.hSin =-hSin_Cos_Table[( uint8_t )( 0xFFu - ( uint8_t )( uhindex ) )];Local_Components.hCos =hSin_Cos_Table[( uint8_t )( uhindex )];break;default:break;}return ( Local_Components );
}int main()
{Trig_Components temp;gpio_init();while(1){gpio_set;temp = trig_functions(-5461);gpio_reset;}
}
查看计算时间
通过示波器的IO口的跳变时间来得到查表计算sin的时间
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