【求助】MDK仿真时变量问题，麻烦大伙帮忙看下~

745021926

设定了变量值自动更新，程序跑的过程中有的值变化，有的值显示“cannot evaluate”，如图，这个是怎么回事？（变量声明见代码，在同一个函数）

代码：

void Coordinate_Compute()

{

        double X_Now = 0;  //current coordinate

        double Y_Now = 0;  //current coordinate

double latitude_temp = 0;  

double latitude_cur = 0;  

double C1,C2,C3,C4,C5,C6;  //middle value   

double C = 0;    //middle value   

// double Latitude_Per=40075.04/360;  //the distance of per latitude 

float R = 6371.004;  //radius of earth(km)

float Pi = 3.141593;    //PI

double Distance = 0;  //result of compute

C1 = C2 = C3 = C4 = C5 = C6 = C;  //init middle value

latitude_cur = (double)gpsx.latitude;

latitude_temp = latitude_cur - Latitude_Set;

X_Now = R * (latitude_temp) / (2 * Pi * 1000);//update the X_Now ,m

// C=sin((Latitude_Set/100000))*sin((gpsx.latitude/100000))+cos((Longitude_Set/100000-gpsx.longitude/100000))*cos((Longitude_Set/100000))*cos((gpsx.longitude/100000));

// C=sin()*sin()+cos()*cos()*cos();

//  the value of C is WRONG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

C1 = (Latitude_Set / 100000);

C2 = (Latitude_Now / 100000);   

C3 = Longitude_Set / 100000 - Longitude_Now / 100000;

C4 = (Latitude_Set / 100000);

C5 = (Latitude_Now / 100000);

C = sin(C1) * sin(C2) + cos(C3) * cos(C4) * cos(C5);

/////////////////////////////////////////////////////////////////////

Distance = R * acos(C) * Pi * 1000 / 180; //m

C6 = pow(Distance,2) - pow(X_Now,2);

Y_Now = sqrt(C6); 

if(X_Now < 0) 

{

LCD_ShowString(120,150,20,16,16,"-"); 

X_Now = - X_Now;

}

else LCD_ShowString(150,150,20,16,16," "); 

if(Longitude_Set - ((double)gpsx.longitude) > 0) 

{

LCD_ShowString(140,170,20,16,16,"-"); 

Y_Now = Y_Now;

}

else LCD_ShowString(150,170,20,16,16," "); 

LCD_ShowxNum(150,150,X_Now,5,16,0);

LCD_ShowxNum(150,170,Y_Now,5,16,0);

LCD_ShowxNum(150,190,Distance,5,16,0);

}

745021926

打了断点以后，那些“cannot evaluate”变量值是可以显示的~

正点原子

不解,我一般都是断点查看的...

chupacabra96

回复【3楼】正点原子:
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回复【3楼】正点原子:
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据说可以实时查看变量的变化 ，IAR就有 好郁闷，不知道mdk、为什么就是用不了

正点原子

MDK也有，但是变化不受控，只能感官的看看。。。