求助三轴加速度MMA8451的使用程序和使用方法？

1楼-- · 2020-01-23 17:46

也可以发我邮箱1216529013@qq.com，小弟感激不尽！

2楼-- · 2020-01-23 21:13

void main()
{
unsigned char x, y, z,v=0,tv;
char piancha=0;
uchar jiasudu=0;//
uchar jiao=0;
// float jiasudu=0.0001;//
// float jiao=0.0001;

init_12864();
clear();
// locate( 1, 1 );write_hz("偏离垂直方向角度");
delayms(10);
TMOD=0x21;    //定时T1方式2，接P3.5  C/T=0,M1=1，定时T0方式1, M0=1 接P3.4
SCON=0x60; //8 bit  SM1=SM2=1，SM0=0, REN=0
TL1=0xfd; //9600
TH1=0xfd;
TR1=1;
ET0=1;
EA=1;

MMA845x_init(); //初始化MMA845x
MMA845x_readbyte( 0x08);
MMA845x_readbyte( 0x04);
MMA845x_readbyte( 0x02);

v= MMA845x_readbyte(WHO_AM_I_REG); //把读取的字节赋给v
if((v == MMA8451Q_ID)||(v == MMA8452Q_ID)||(v == MMA8453Q_ID))
{
   send232byte('O');
   send232byte('K');
   send232byte('!');
}
else
{
   send232byte('F');
   send232byte('a');
   send232byte('i');
   send232byte('l');
   send232byte('!');
}

while(1)
{ //读取重力信息

x = MMA845x_readbyte(OUT_X_MSB_REG); //x轴重力信息
    y = MMA845x_readbyte(OUT_Y_MSB_REG); //y轴重力信息
    z = MMA845x_readbyte(OUT_Z_MSB_REG); //z轴重力信息

send232byte(0x55);
send232byte(0xAA);
send232byte(x);
send232byte(y);
send232byte(z);

   if(x>127)  //读取8位数据  只读取z轴的数据
   {
      tv=~x+1; //取反加一
send232byte('-');  locate( 2, 1 ); write_hz("x=-");
   }
   else
   {
      send232byte('+'); locate( 2, 1 ); write_hz("x=+");
      tv=x;
   }
//
// // jiao=(atan(x/z)*180.0/3.1415926)*1000; //角度计算
//    // jiao=((float)(acos(tv/63))*180/3.14)*1000; //角度计算
// // jiaodu[0]=jiao%10000/1000;
//    jiaodu[1]=jiao%10000%1000/100;
//    jiaodu[2]=jiao%10000%1000%100/10;
//    jiaodu[3]=jiao%10000%1000%100%10;
//    locate( 2, 3 );
//    // write_number(jiaodu[0]);
//    write_number(jiaodu[1]);
//    write_number(jiaodu[2]);
//    write_number(jiaodu[3]);
   jiasudu=(((float)tv)/0x3f)*10000;//计算加速度值大小
   //jiasud[0]=jiasudu%10000/1000;
   jiasud[1]=jiasudu%10000%1000/100;
   jiasud[2]=jiasudu%10000%1000%100/10;
   jiasud[3]=jiasudu%10000%1000%100%10;
// jiasud[3]=jiasudu%10000%1000%100/10;
   locate( 2, 3 );
   //write_number(jiasud[0]);
   write_number(jiasud[1]);
   write_number(jiasud[2]);delayms(1);
   write_number(jiasud[3]);

if(y>127)  //读取8位数据  只读取z轴的数据
   {
      tv=~y+1; //取反加一
send232byte('-');  locate( 3, 1 ); write_hz("y=-");
   }
   else
   {
      send232byte('+'); locate( 3, 1 ); write_hz("y=+");
      tv=y;
   }
//    jiao=((float)(acos(tv/63))*180/3.14)*1000; //角度计算
//    jiaodu[0]=jiao%10000/1000;
//    jiaodu[1]=jiao%10000%1000/100;
//    jiaodu[2]=jiao%10000%1000%100/10;
//    jiaodu[3]=jiao%10000%1000%100%10;
//    locate( 3, 3 );
//    write_number(jiaodu[0]);
//    write_number(jiaodu[1]);
//    write_number(jiaodu[2]);
//    write_number(jiaodu[3]);
   jiasudu=(((float)tv)/0x3f)*10000;//计算加速度值大小
   jiasud[0]=jiasudu%10000/1000;
   jiasud[1]=jiasudu%10000%1000/100;
   jiasud[2]=jiasudu%10000%1000%100/10;
   jiasud[3]=jiasudu%10000%1000%100%10;
   locate( 3, 3 );
   // write_number(jiasud[0]);
   write_number(jiasud[1]);
   write_number(jiasud[2]);delayms(1);
   write_number(jiasud[3]);

if(z>127)  //读取8位数据  只读取z轴的数据
   {
      tv=~z+1; //取反加一
send232byte('-');  locate( 4, 1 ); write_hz("z=-");
   }
   else
   {
      send232byte('+'); locate( 4, 1 ); write_hz("z=+");
      tv=z;
   }
//    jiao=((float)(acos(tv/63))*180/3.14)*1000; //角度计算
//    jiaodu[0]=jiao%10000/1000;
//    jiaodu[1]=jiao%10000%1000/100;
//    jiaodu[2]=jiao%10000%1000%100/10;
//    jiaodu[3]=jiao%10000%1000%100%10;
//    locate( 4, 3 );
//    write_number(jiaodu[0]);
//    write_number(jiaodu[1]);
//    write_number(jiaodu[2]);
//    write_number(jiaodu[3]);
// printf("偏离垂直方向角度=%f",jiao);
   jiasudu=(((float)tv)/0x3f)*10000;//计算加速度值大小
   //jiasud[0]=jiasudu%10000/1000;
   jiasud[1]=jiasudu%1000/100;
   jiasud[2]=jiasudu%100/10;
   jiasud[3]=jiasudu%100%10;
   locate( 4, 3 );
   // write_number(jiasud[0]);
   write_number(jiasud[1]);
   write_number(jiasud[2]);delayms(1);
   write_number(jiasud[3]);

      //getAll();
}
}
为啥我测不出角度值啊，！难道转换公式不对吗！  请大侠帮助