ATmage128 complete program to operate 16-bit AD chip MAX1168

/****************Pin Definition********************************
Interface: Hardware SPI
PB.1(SCK) SCLK Direction: 1
PB.2(MOSI) DIN Direction: 1
PB.3(MISO) DOUT Direction: 0
PB.4 CS Direction: 1
PB.5 EOC Direction: 0 DRRB="0x06"

MCU:ATmage128
AD:MAX1168(16bit)
Crystal:11.0592MWritten
by:Jesse Rei
**************************************************************/
#include
#include
#include"lcd.c"

#define uchar unsigned char
#define uint  unsigned int

#define Command_H 0x01 //000 00 00 1 Channel 0, single channel conversion, no power saving mode, internal clock
#define Command_L 0x00 //The lower eight bits of the command are any number

#define CS_L   PORTB&=~(1<<4) //PB.4
#define CS_H   PORTB|=(1<<4)  
#define READY  PINB&0x20     //PB.5

fly tab[10]={'0','1','2','3','4','5','6','7','8','9'};

/**************Global variables********************************/
uchar buffer[5]={1,1,1,1,1};
uchar count="0";
uint sum="0";
/***************************************************/
/******************Port initialization***********************/
void port_init(void)
{
 PORTA = 0xff;
 DDRA = 0xff;
 
 PORTB = 0x06;
 DDRB = 0xff;
 
 PORTC = 0x00; //m103 output on ly
 DDRC = 0x00;
 
 PORTD = 0xff;
 DDRD = 0xff;
 
 PORTE = 0x00;
 DDRE = 0x00;
 
 PORTF = 0x00;
 DDRF = 0x00;
 
 PORTG = 0x00;
 DDRG = 0x00;
}
/************************************************************/
/*************************SPI initialization*******************************/
void spi_init(void)
{ 
  SPCR="0x5d"; //SPI enabled, host mode, high byte first, working mode 3, Fck/128
               //SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0
      // 0 1 0 1 1 0 1 1
  SPSR = 0x00; //setup SPI, host frequency multiplication     
}
/*************************************************************/
/*************************Start AD conversion***************************/
void start(uchar Com_H,uchar Com_L)
{
  CS_L;
  SPDR="Com"_H;
  while(!(SPSR&(1<   SPDR="Com"_L;
  while(!(SPSR&(1<}
/************************************************************/
/******************Disassemble the number to display****************************/
void data_to_buffer(uint a)
{
  uchar i;
  for(i=0;i<=4;i++)
  {
    buffer[i]=a%10;
 a=a/10;
  }
}
/******************************************************************/
/*********************Disassemble the number to display****************************/
void getdata(void)
{
  uchar data_l=0, data_h=0;
  uint ad_data =0,ad_data1 =0,ad_data2 ;
  uint ad_dat=0;

  SPDR = 0xff; //Send data and provide pulse to max1168
  while (!(SPSR &(1<   da ta_h=SPDR; //Get the high eight bits
  
  SPDR = 0xff; //Send data and provide pulses to max1168
  while (!(SPSR &(1<   ta_l =SPDR; //Get the lower eight bits
  
  ad_ta =(unsigned int)ta_h *256+ta_l ; //Merge the upper and lower eight bits
  ad_dat=ad_ta /16; //Convert to voltage value 
  
  sum+=ad_dat; //Sixteen sampling results cumulative sum
  count++;
  if(count>15)
  {
    count="0";
 ad_ta1 =sum/16; //sum divided by 16 to get the average value
    ad_ta2 =ad_ta1 *3;
    ta_to_buffer (ad_ta2 );  
 sum=0;   
  }

  CS_H;
}
/**********************************************************/
/*************************延时1ms**************************
void delay1ms(uint t)
{
 uint i; 
 for(;t>0;t--)
  for(i=0;i<1106;i++)
   ;       
}
**********************************************************/
/*************************主程序***************************/
void main()
{
  port_init();
  init_lcd();
  lat_disp (0x00,0x00);
  chn_disp (tab1);
  delay1ms(5500);
  chn_disp (tab2);

  spi_init();

  start(Command_H,Command_L);
  while(1)
  {
 while(READY);  //等待转换结束
    getdata();
    disp_two_char(0x8a,tab[buffer[4]],tab[buffer[3]]); 
    disp_two_char(0x8b,tab[buffer[2]],tab[buffer[1]]); 
    disp_two_char(0x8c,tab[buffer[0]],'V');

    start(Command_H,Command_L);
  }
}