//*****************************************************

 //名称：单片机串口输出ADXL335角度值

 //使用单片机：stc12c5a60s2

 //供电：电压5v

 //晶振：11.0592m

 //X轴->(ADC0)P1.0

 //Y轴->(ADC1)P1.1

 //Z轴->(ADC1)P1.2

 //用pc串口助手显示时，选择字符显示

 //参考宏晶网址例程

 //*****************************************************

 #include "reg51.h"

 #include "intrins.h"

 #include  <math.h>    //Keil library

 #include  <stdio.h>   //Keil library

 //#define FOSC    18432000L

 #define FOSC    11059200L  //晶振11.0592M

 #define BAUD    9600

 typedef unsigned char BYTE;

 typedef unsigned int WORD;

 #define   uchar unsigned char

 #define   uint unsigned int    

 /*Declare SFR associated with the ADC */

 sfr AUXR1       =   0XA2;

 sfr ADC_CONTR   =   0xBC;           //ADC control register

 sfr ADC_RES     =   0xBD;           //ADC high 8-bit result register

 sfr ADC_RESL    =   0xBE;

 sfr ADC_LOW2    =   0xBE;           //ADC low 2-bit result register

 sfr P1ASF       =   0x9D;           //P1 secondary function control register

 /*Define ADC operation const for ADC_CONTR*/

 #define ADC_POWER   0x80            //ADC power control bit

 #define ADC_FLAG    0x10            //ADC complete flag

 #define ADC_START   0x08            //ADC start control bit

 #define ADC_SPEEDLL 0x00            //420 clocks

 #define ADC_SPEEDL  0x20            //280 clocks

 #define ADC_SPEEDH  0x40            //140 clocks

 #define ADC_SPEEDHH 0x60            //70 clocks

 void InitUart();

 void InitADC();

 void SendData(BYTE dat);

 int GetADCResult(BYTE ch);

 void Delay(WORD n);

 uchar ge,shi,bai,qian,wan;           //显示变量

 void conversion(uint temp_data)

 {

     wan=temp_data/+0x30 ;

     temp_data=temp_data%;   //取余运算

     qian=temp_data/+0x30 ;

     temp_data=temp_data%;    //取余运算

     bai=temp_data/+0x30   ;

     temp_data=temp_data%;     //取余运算

     shi=temp_data/+0x30    ;

     temp_data=temp_data%;      //取余运算

     ge=temp_data+0x30;

 }

 /*----------------------------

 Get ADC result

 ----------------------------*/

 int GetADCResult(BYTE ch)

 {   int AD10bitResult;

     ADC_CONTR = ADC_POWER | ADC_SPEEDLL | ch | ADC_START;

     _nop_();                        //Must wait before inquiry

     _nop_();

     _nop_();

     _nop_();

     while (!(ADC_CONTR & ADC_FLAG));//Wait complete flag

     ADC_CONTR &= ~ADC_FLAG;         //Close ADC

     AD10bitResult=ADC_RES;

     AD10bitResult<<=;

     AD10bitResult|=ADC_RESL;

     return AD10bitResult;                  //Return 10BIT ADC result

 }

 /*----------------------------

 Initial UART

 ----------------------------*/

 void InitUart()

 {

     SCON = 0x5a;                    //8 bit data ,no parity bit

     TMOD = 0x20;                    //T1 as 8-bit auto reload

     TH1 = TL1 = -(FOSC///BAUD); //Set Uart baudrate

     TR1 = ;                        //T1 start running

 }

 /*----------------------------

 Initial ADC sfr

 ----------------------------*/

 void InitADC()

 {

     P1ASF = 0xff;                   //Open 8 channels ADC function

     AUXR1=AUXR1|0X04;              //ad值左对齐

     ADC_RES = ;                    //Clear previous result

     ADC_CONTR = ADC_POWER | ADC_SPEEDLL;

     Delay();                       //ADC power-on and delay

 }

 /*----------------------------

 Send one byte data to PC

 Input: dat (UART data)

 Output:-

 ----------------------------*/

 void SendData(BYTE dat)

 {

     while (!TI);                    //Wait for the previous data is sent

     TI = ;                         //Clear TI flag

     SBUF = dat;                     //Send current data

 }

 /*----------------------------

 Software delay function

 ----------------------------*/

 void Delay(WORD n)

 {

     WORD x;

     while (n--)

     {

         x = ;

         while (x--);

     }

 }

 //******************************************************************************

 void main()

 {   int x,y,z;

     float Q,T,K,Roll,Pitch;

     InitUart();                     //Init UART, use to show ADC result

     InitADC();                      //Init ADC sfr

     while ()

     {

         x=GetADCResult();

         y=GetADCResult();

         z=GetADCResult();

         // 0-5v 对应 0-1024

         // 3.3v/2  = 1.65v（0g时候值）

         // 1.65v ->= 338   (AD值即0X0152)

         x-=0X0152; //

         y-=0X0152;

         z-=0X0152;

     Q=x;

     T=y;

     K=z;

     Q=-Q;

     Roll=(float)(((atan2(K,Q)*)/3.14159265)+);

     Pitch=(float)(((atan2(K,T)*)/3.14159265)+);

     conversion(Roll);    //横滚角0-360度

   //conversion(Pitch); //俯仰角0-360度

     SendData(bai);

     SendData(shi);

     SendData(ge);

     SendData(0x0d);

     SendData(0x0a);//换行，回车

     Delay();

     }

 }