基于STM32的经纬度坐标运算器

 通过STM32F103作为控制芯片，将液晶显示屏作为运算器的显示界面，4×4键盘为运算输入模块，制作了经纬度运算器，可以从键盘输入经度纬度以及偏向角度与距离，计算对方的经纬度坐标，经纬度运算部分代码如下所示。

#include "stm32f1xx_hal.h"
#include "usart/bsp_debug_usart.h"
#include "led/bsp_led.h"
#include "beep/bsp_beep.h"
#include "keypad.h"
#include "math.h"
#define pi 3.14159265
float Ea = 6378136.49;
float Eb = 6356755.2882; 

int ChangetoSexagesimal(float Num, int *a, int *b, int *c)
{

    float e;
    int Hour,Minute,Second;
        
    Hour = (int)(Num);                              //                
    Minute = (int)((Num-Hour)*60);                  
    Second = (int)(((Num-Hour)*60 - Minute) *60);   //

    e = ((Num-Hour)*60 - Minute) *60 - Second;      //ËÄÉ«ÎåÈë

    if(5 <=(int)(e *10) )
    {
        Second = Second + 1;
    }
    
    if(60 == Second)
    {
        Second = 0;
        Minute = Minute + 1