avr i2c.c

i2c通信

#include "twi.h"
#include "mega8.h"   
#include "stdlib.h"    
#include "math.h"  
#include "I2CFEEP.h" 
#include "eeprom.h"
#include "adc.h"
#include "systeminit.h" 



unsigned char *cpEEP,sig,sigOTC,sigSTC;
unsigned int adcustore[20];
unsigned int adcmstore[14];
unsigned int adcuadd,adcmadd,lastadcmadd,adc6add;  
unsigned int adcustore2[20];
unsigned int adcmstore2[14];
unsigned int adcuadd2,adcmadd2,lastadcmadd2,adc7add;
     
unsigned int R,R2,Rf,Rs,Rd;
unsigned int adc6min;
unsigned int adc6max;
unsigned int adc7min;
unsigned int adc7max;
unsigned int adc6mid;
unsigned int adc7mid;

float cangle6,cangle7;
unsigned int icangle6,icangle7;
float A6;
float A7;
unsigned int offset,poffset;
unsigned char delaytime;


   



   /*
unsigned int time_cnt=0;  

interrupt [TIM0_OVF] void timer0_ovf_isr(void)
{  
TCNT0=5;
if(time_cnt==4000)
{ 
  time_cnt=0;
  PORTD=~PIND;

}   
else
{
time_cnt++;
}


} 
 */
 
 
 /***********求反正弦*************/
unsigned int arcsin(unsigned int x)
 {   unsigned int px;
     unsigned int r; 
     px=x;
      
     if((px>=0)&&(px<=2500))  r=(px+86)/86;                //0-14
     else if((px>2500)&&(px<=4300)) r=29+(px-2500+83)/83;    // 15-25
     else if((px>4300)&&(px<=5800)) r=51+(px-4300+76)/76;    //26-35
     else if((px>5800)&&(px<=7100)) r=71+(px-5800+67)/67;    //36-45
     else if((px>7100)&&(px<=7700)) r=91+(px-7100+59)/59;    //46-50
     else if((px>7700)&&(px<=8200)) r=101+(px-7700+53)/53;    //51-55
      else if((px>8200)&&(px<=8700)) r=111+(px-8200+47)/47;    //56-60
       else if((px>8700)&&(px<=9100)) r=121+(px-8700+40)/40;  //61-65
        else if((px>9100)&&(px<=9400)) r=131+(px-9100+33)/33; //66-70
        else if(px>9400) r=180;                               //71-90
        r=r>>1;
  
  //  if((y==1)&&(x>=0)) r=90-r;  
  //  else if((y==1)&&(x<0)) r=90+r; 
  
    return r;   
 }
 /************************/
 
 /******点亮某个LED*********/
void lightled(unsigned char num)
{
     if((num%2)==1) 
     {PORTB&=0xfc;PORTB|=0x02;PORTD=~(0x01<<((num+1)/2-1));}
     else 
     {PORTB&=0xfc;PORTB|=0x01;PORTD=~(0x01<<((num+2)/2-1));}
}
/*************/

/******延时******/
void delayms(unsigned char ii)
{
   unsigned char i=100;
   while(ii--)
   {
   while(i--);
   }  
}  
/****************/
/*******开关延时***********/
unsigned char delayswitch(void)
{  unsigned int  ii;
  ii=0;
   PORTB|=0x01;
   PORTB&=0xfd;
   delayms(10);
 while(!(PINC&0x08))

   {  delayms(1);
     ii++;
     if(ii>4500) 
     {
         return 0;
     }                                               
     else if((ii>3000)&&(ii<=4500)) {PORTD=0xf8; }  
     else if((ii>1500)&&(ii<=3000)) {PORTD=0xfc; }
     else if((ii>50)&&(ii<=1500)) {PORTD=0xfe; }
    
   }
  PORTB&=0xfe; 
     if((ii>3000)&&(ii<=4500)) {return 3; }  
     else if((ii>1500)&&(ii<=3000)) {return 2; }
     else if((ii>50)&&(ii<=1500)) {return 1; }
   return 0;
   
}
/****************/

/****端口初始化*****/
static void io_init(void)
{
PORTD = 0xff;
DDRD = 0xff;
PORTC =0xff;
DDRC=0x00;
PORTB =0x00;
DDRB=0xff;
}
/************/


/******主函数******/
 void main(void)
{  
   unsigned int countnum0,countnum1;
   unsigned int i,j,k,uu6,uu7;
  // int f=0;
  // unsigned char ii,jj,nn;
  #asm("sei")
  SREG&=0x7f;   /* 关中断  */
  delayms(100);   /*延时*/
  SYS_INIT();     /*系统初始化*/
  io_init();     /*IO初始化*/
  adcinit(ADC_VREF_TYPE,ADC_ADCSRA); /*ADC初始化*/
  I2CINIT(cpEEP);                    /*将指针指向数组*/
  twi_slave_init(0x00); //初始化为从机 
/************变量初始化***************/    
countnum0=0;
countnum1=0;
adcuadd=0;
adcmadd=0;

adcuadd2=0;
adcmadd2=0;
lastadcmadd=1000; 
lastadcmadd2=1000; 

 
 adc6min=900;
 adc6max=300;
 adc7min=900;
 adc7max=300;
 adc6mid=600;
 adc7mid=600;
 sig=1;
 sigOTC=0;
 sigSTC=0;
 /*******************************/ 

/************读EEPROM初始化极值****************/
adc6min=EEPROM_Read(0)*256+EEPROM_Read(1);
adc6max=EEPROM_Read(2)*256+EEPROM_Read(3);
adc7min=EEPROM_Read(4)*256+EEPROM_Read(5);
adc7max=EEPROM_Read(6)*256+EEPROM_Read(7);
/****************************************/
/***************读EEPROM初始化零点*****************/
offset=EEPROM_Read(10)*256+EEPROM_Read(11);
/*****************************************/

/*************初始化幅度值和中值***************/
    A6=(float)(adc6max-adc6min)/2.0;  
    A7=(float)(adc7max-adc7min)/2.0; 
    adc6mid=(adc6min+adc6max)/2;  
    adc7mid=(adc7min+adc7max)/2;
/****************************/


if(offset>15)     /*****零点约束*****/
 offset=0;
 
 read_adc(6);read_adc(7);    /*******ADC第一次读取********/
 delayms(20);               /**********延时*******/
 SREG|=0x80; 
 
while(1)
{   
    if(countnum0==16)                 /**是否到第十六次读ADC***/
  {    countnum0=0;sigOTC=1;           /***计数值清零 置标志****/
      for(i=0;i<15;i++)                /***对十六个值排序*****/
         for(j=i+1;j<16;j++) 
         {
            if(adcustore[i]>adcustore[j])
            {  
               k=adcustore[j];
               adcustore[j]=adcustore[i];
               adcustore[i]=k;  
               
            }
           if(adcustore2[i]>adcustore2[j])
            {  
               k=adcustore2[j];
               adcustore2[j]=adcustore2[i];
               adcustore2[i]=k;  
               
            }
          }
  
     for(i=7;i<9;i++)                          /***取中间值****/
     {
     adcuadd=adcuadd+adcustore[i];
     adcuadd2=adcuadd2+adcustore2[i];
     }
     adcmstore[countnum1]=adcuadd/2;           /*****存中间值*******/
     adcmstore2[countnum1]=adcuadd2/2; 
     adcuadd=0;  adcuadd2=0;
     countnum1++;   
  } 
 else 
  {  
        SREG&=0x7f;                               /*关中断*/
   
       adcustore[countnum0]= read_adc(6);        /**读转换结果***/
 
       adcustore2[countnum0++]=read_adc(7);
     SREG|=0x80;                                    /*开中断*/
  }   
////////////////////////////////////////////////////////////////////// 

  if((countnum1==10)&&sigOTC)                    /*是否到第十个中间值*/
   {     sigSTC=1; sigOTC=0;                     /*置标志**/
   
   /*   
   for(i=0;i<9;i++) 
       for(j=i+1;j<10;j++)
         { 
            if(adcmstore[i]>adcmstore[j])
            {
               k=adcmstore[j];
               adcmstore[j]=adcmstore[i];
               adcmstore[i]=k; 
               adcmstore[i]=k; 
            }
              if(adcmstore2[i]>adcmstore2[j])
            {
               k=adcmstore2[j];
               adcmstore2[j]=adcmstore2[i];
               adcmstore2[i]=k;  
            }
              
       }   
       */
       /////////////////////////////   
        for(i=0;i<10;i++)                    /*求均值*/
     {
     adcmadd=adcmadd+adcmstore[i]; 
     adcmadd2=adcmadd2+adcmstore2[i];
     }
     adcmadd=adcmadd/10; 
     adcmadd2=adcmadd2/10;
     
     countnum1=0;                           /*计数值清零*/
     
     /////////////////////////
         /*

 if(lastadcmadd!=1000) 
    { 
     if(lastadcmadd>=adcmadd)
     {
     adcmadd=(adcmadd*8+lastadcmadd*2-abs(lastadcmadd-adcmadd))/10;
     }
     else
     {
     adcmadd=(adcmadd*8+lastadcmadd*2+abs(lastadcmadd-adcmadd))/10;
     }
    } 
    //else 
    //{
    // adcmadd=(adcmadd*8+lastadcmadd*2)/10;
      
    //}
     lastadcmadd=adcmadd;   
     
      if(lastadcmadd2!=1000) 
    { 
     if(lastadcmadd2>=adcmadd2)
     {
     adcmadd2=(adcmadd2*8+lastadcmadd2*2-abs(lastadcmadd2-adcmadd2))/10;
     }
     else
     {
     adcmadd2=(adcmadd2*8+lastadcmadd2*2+abs(lastadcmadd2-adcmadd2))/10;
     }
    } 
    //else 
   // {
     //adcmadd2=(adcmadd2*8+lastadcmadd2*2)/10;
      
    //}
     lastadcmadd2=adcmadd2; 
*/
/*  //for(ii=0;ii<8;ii++)
  //if(((adcmadd-adc6min)>(170-ii*10))||((adcmadd-adc6min)<(10+ii*10)))  uratc=urat[ii];

for(ii=16;ii>=1;ii--)
{
if((adcmadd-adc6min)>(ii*200/rat6)) break;
}

pdegree=0;
for(jj=1;jj<=ii;jj++)
{   if(ii==jj) 
    {  
      
   if(jj<=8) pdegree+=urat[jj-1]*((adcmadd-adc6min)-(ii*200/rat6))/10 ;
        else pdegree+=urat[16-jj]*((adcmadd-adc6min)-(ii*200/rat6))/10 ; 
     }

    else
        {
    if(jj<=8) pdegree+=urat[jj-1];
        else pdegree+=urat[16-jj]; 
    }