do_1543.c

ad1543的驱动程序！！！！！已经通过调试的！！请放心使用！

#include "reg51.h"
#include "string.h"
#include "intrins.h"
#include "stdlib.h"


sbit EOC=P1^0;
sbit CLOCK=P1^1;
sbit ADDR=P1^2;
sbit DATAOUT=P1^3;
sbit _CS=P1^4;

#define uint unsigned int
#define uchar unsigned char

uint read1543(uchar port) //从TLC1543读取采样值,形参port是采样的通道号
{
  uint data ad;uint data i;
  uchar data al=0,ah=0;
  _CS=1;
  _nop_();_nop_();_nop_();
  CLOCK=0;
  _CS=0;
  port<<=4;
  for (i=0;i<4;i++) //把通道号打入1543
  {
    ADDR=(bit)(port&0x80);CLOCK=1;CLOCK=0;
    port<<=1;
  }
  for (i=0;i<6;i++) //填充6个CLOCK
  {
    CLOCK=1;CLOCK=0;
  }
  _CS=1;
  _nop_();_nop_();_nop_();
  _nop_();_nop_();_nop_();
  while(!EOC); //等待AD转换
  _CS=0;
  for (i=0;i<2;i++) //取D9,D8
  {
    DATAOUT=1;
    CLOCK=1;
    ah<<=1;
    if(DATAOUT) ah|=0x01;
    CLOCK=0;
   } 

  for (i=0;i<8;i++) //取D7--D0
  {
    DATAOUT=1;
    CLOCK=1;
    al<<=1;
    if(DATAOUT) al|=0x01;
    CLOCK=0;
  } 
  _CS=1;
  ad=(uint)ah;ad<<=8;ad|=(uint)al; //得到AD值
  return (ad);
}