ADS8344数据老是跳，求助！！

只看该作者 · 2009-12-14 13:44

哪位用过ADS8344的，能否帮我看下程序，数字量输出老是跳，不稳定。比如2V输入，满量程5V，结果波动会在26200~26000.
或者谁有代码可以给我参考下，万分感谢！！

#include "C8051F040.h"
#include "ABSACC.H"
#include <intrins.h>

  sbit ADC_CLK =P0^2;//19
  sbit ADC_DOUT  =P0^3;//15
  sbit ADC_DIN =P0^4;//17
  sbit ADC_CS0 =P0^5; //18
  sbit ADC_CS1 =P0^6;//18
  sbit ADC_BUSY0 =P0^7; //16
  sbit ADC_BUSY1 =P1^0;//16

unsigned char data AttData[3];

void Timer_Init()
{
SFRPAGE = TIMER01_PAGE;
TMOD    = 0x22;
TH1    = 0x4C;
CKCON    = 0x12;
TCON    = 0x44;
TH0    = 0x9C;
   SFRPAGE = TMR2_PAGE;
   TMR2CN = 0x04;

}

void UART_Init()
{
SFRPAGE = UART0_PAGE;
SCON0    = 0x50;
SCON0    &= 0xFC;
SSTA0    = 0x10;
}

void EMI_Init()
{
SFRPAGE = EMI0_PAGE;
EMI0CF = 0x3B;
}

void Port_IO_Init()
{ SFRPAGE = CONFIG_PAGE;
P0MDOUT = 0x76;
P0=88;

P1MDOUT = 0xFF;
P4MDOUT = 0xFF;
P5MDOUT = 0xFF;
P6MDOUT = 0xFF;
P7MDOUT = 0xFF;
XBR0    = 0x04;
XBR2    = 0x40;
}

void Oscillator_Init()
{
int i = 0;
SFRPAGE = CONFIG_PAGE;
OSCICN = 0x80;
  CLKSEL = 0x00;

}

void Interrupts_Init()
{
IE       = 0xB2;
IP       = 0xD2;
EIE2    = 0x20;
}

void WatchDog_Init()
{
WDTCN=0x47;
WDTCN=0xDE;
WDTCN=0xAD;
}

void Init_Device(void)
{
WatchDog_Init();
Timer_Init();
UART_Init();
EMI_Init();
Port_IO_Init();
Oscillator_Init();
Interrupts_Init();
}

void ADC_Delay(void)
{
  int k=0;
  //for(k=0;k<5;k++);
for(k=0;k<50;k++); //change by wb
}

//AD转换函数 chan：0-15

unsigned int ADC ( unsigned char chan)
{
unsigned int  ADdata=0;

unsigned char idata outcmd;

unsigned char code ChannelTable[8]={0,4,1,5,2,6,3,7};//转换表格

int i;
ADC_DIN=0 ;
//通道有效性检查

if(chan<0)

chan=0;

if(chan>15)

chan=15;

//使能芯片

ADC_CLK=0;
   ADC_CS0=0;
   ADC_Delay();

// 写命令
outcmd=(ChannelTable[chan]<<4) | 0x86;  //内时钟模式。
for(i=0;i<8;i++)
{
   ADC_CLK=0;
      ADC_Delay();

if(outcmd&0x80)

ADC_DIN=1;
   else ADC_DIN=0;
   outcmd=outcmd<<1;
   ADC_CLK=1;
   ADC_Delay();
}

   ADC_CLK=0;

      ADC_CS0=1;

//等待转换结束
   if(chan<8)
      while(!ADC_BUSY0);
   else
   while(!ADC_BUSY1);

  //ADC_CLK=1;//by wb

   ADC_CS0=0;

//ADC_Delay();

for(i=0;i<16;i++)

  { ADdata= ADdata<<1;

ADC_CLK=1;//by wb

ADC_Delay();//by wb

ADC_CLK=0;//by wb

ADC_Delay();//by wb

if(ADC_DOUT)

ADdata|=0x0001;

//ADC_Delay();

   }

for(i=0;i<8;i++)

  {

ADC_CLK=1;//by wb

ADC_Delay();//by wb

ADC_CLK=0;//by wb

ADC_Delay();//by wb

   }

ADC_CS0=1;

return ADdata ;

}

  void main()
{
unsigned int j=0;

int k;
Init_Device();
XBYTE[0xFF80]=0x00  ;    //55;

j=ADC(0);

k=0;
}