调试mma7455的代码：

#include "msp430f5438.h"

#include "public.h"

#include "simulate_iic.h"

#include <stdbool.h>

#include "init.h"

#include "mma7455.h"

#include "lcd1602.h"

#include<math.h>

typedef unsigned int uint;

typedef unsigned char uchar;

char mma7455write_byte(unsigned char reg,unsigned char data)//寄存器地址，数据

{

char flag;

// WDTCTL = WDTPW + WDTHOLD; // 禁止看门狗定时器

iic_start();//起始信号

write_byte(0x3a);//数据发送

flag=get_ack();//接受应答位，即数据成功发送后，接受到的应答

if(flag)

{

flag=0;

write_byte(reg);//数据发送

}

flag=get_ack();//接受应答位，即数据成功发送后，接受到的应答

if(flag)

{

flag=0;

write_byte(data);

}

flag=get_ack();

if(flag)

{

flag=0;

iic_stop();

return 0;

}

return 1;

}

char readMMA7455Byte(unsigned char regadd)

{

char flag;

char z;

z=0;

iic_start();

write_byte(0x3a);//先写入器件地址

flag=get_ack();

if(flag)

{

write_byte(regadd);//有应答之后再写寄存器地址

flag=0;

}

flag=get_ack();

if(flag)

{

flag=0;

iic_start();//继续等应答之后写入该地址和读命令，可是觉得这不必要这么做

write_byte(0x3b);//但是时间的原因，只有找着实例的操作先写着，以后再修改

}

flag=get_ack();

if(flag)

{

flag=0;

z=read_byte();

}

send_ack();

iic_stop();

return z;

}

// X:255 1.65V -1.00g

// 012345678901234567

void Cvt_Str(char zifu[], char V1)

{

char characters[17]="0123456789ABCDEF";

char tv=0;

tv=V1/100;

zifu[2] = characters[tv];

tv=(V1%100)/10;

zifu[3] = characters[tv];

tv=V1%10;

zifu[4] = characters[tv];

zifu[5] = ' ';

zifu[6] = '0';

zifu[7] = 'x';

tv=V1/16;

zifu[8] = characters[tv];

tv=V1%16;

zifu[9] = characters[tv];

zifu[10] = ' ';

if(V1>127)

{

zifu[11] = '-';

tv=255-V1;

zifu[12] = characters[tv/63];

zifu[13] = '.';

zifu[14] = characters[((tv*100/63)%100)/10];

zifu[15] = characters[(tv*100/63)%10];

}

else

{

zifu[11] = '+';

tv=V1;

zifu[12] = characters[tv/63];

zifu[13] = '.';

zifu[14] = characters[((tv*100/63)%100)/10];

zifu[15] = characters[(tv*100/63)%10];

}

zifu[16] = 'g';

}

uintarc_tan2(uchar Ax,uchar Ay)

{

intdiat_t;

floatm;

m=atan2(Ay,Ax);

diat_t=(int)(m*1800/3.14);

returndiat_t;

}

uint measure()

{

uchar x;

uchar y;

uint x1,y1;

ucharxsign,ysign;

uint angle;

angle=0;

x=readMMA7455Byte(0x06);

y=readMMA7455Byte(0x07);

x=x+0x2C;

y=y+0x25;

if(x>127)

{

x=255-x;

x1=((float)x*100)/63.0;

xsign=0x2b;

}

else

{

x1=((float)x*100)/63.0;

xsign=0x2d;

}

if(y>127)

{

y=255-y;

y1=((float)y*100)/63.0;

ysign=0x2b;

}

else

{

y1=((float)y*100)/63.0;

ysign=0x2d;

}

angle = arc_tan2(x1,y1);

/*if(xsign==0x2b&&ysign==0x2b)

{

angle = arc_tan2(x1,y1);

}

elseif(xsign==0x2b&&ysign==0x2d)

{

angle = 900+arc_tan2(y1,x1);;

}

elseif(xsign==0x2d&&ysign==0x2d)

{

angle = 2700-angle;

}

elseif(xsign==0x2d&&ysign==0x2b)

{

angle = 2700+angle;

}*/

return angle;

}

void main()

{

char txtbuf[16]="X:255 -1.00g";

//uchar x,y,x2,y2;

//volatile uint x1,y1;

// uchar j,k;

clk_init();

lcd1602_pin_init();

lcd_init();

delay_ms(50);

while(mma7455write_byte(0x16,0x005));

while(mma7455write_byte(0x10,0xff));//校正X值

while(mma7455write_byte(0x11,0x07));

while(mma7455write_byte(0x12,0x18));//校正Y值

while(mma7455write_byte(0x14,0xDC));//校正Z值

while(mma7455write_byte(0x15,0xFF));

while(1)

{

/*lcd_pos(0,0);

lcd_wdat('a');

lcd_wdat('n');

lcd_wdat('g');

lcd_wdat('l');

lcd_wdat('e');

lcd_wdat(':');

lcd_printf(measure());//x

//delay_ms(1000);

//lcd_wcmd(0x01);*///显示清屏

/*x=readMMA7455Byte(0x06);

y=readMMA7455Byte(0x07);

x2=x+0x2C;

y2=y+0x25;

x=x+0x2C;

y=y+0x25;

if(x>0x7f)

{

x=255-x;

j=1;

x1=((float)x*100)/63.0;

}

else

{

x1=((float)x*100)/63.0;

j=0;

}

if(y>0x7f)

{

y=255-y;

y1=((float)y*100)/63.0;

k=1;

}

else

{

y1=((float)y*100)/63.0;

k=0;

}

lcd_pos(0,0);

if(j==1) lcd_wdat('-');

else lcd_wdat('+');

lcd_char(x1);

lcd_pos(0,1);

if(k==1) lcd_wdat('-');

else lcd_wdat('+');

lcd_char(y1);

delay_ms(1000);

lcd_wcmd(0x01);

lcd_pos(0,0);

Cvt_Str(txtbuf,x2);

txtbuf[0]='X';

lcd_string(txtbuf);

lcd_pos(0,1);

Cvt_Str(txtbuf,y2);

txtbuf[0]='Y';

lcd_string(txtbuf);

delay_ms(1000);

lcd_wcmd(0x01);*///显示清屏

lcd_pos(0,0);

Cvt_Str(txtbuf,readMMA7455Byte(0x08));

txtbuf[0]='Z';

lcd_string(txtbuf);

lcd_pos(0,1);

lcd_printf(arc_tan2(readMMA7455Byte(0x08),readMMA7455Byte(0x06)));

delay_ms(1000);

lcd_wcmd(0x01);//显示清屏

lcd_pos(0,1);

Cvt_Str(txtbuf,readMMA7455Byte(0x06));

txtbuf[0]='X';

lcd_string(txtbuf);

lcd_pos(0,0);

Cvt_Str(txtbuf,readMMA7455Byte(0x07));

txtbuf[0]='Y';

lcd_string(txtbuf);

delay_ms(1000);

lcd_wcmd(0x01);//显示清屏

}

}