ads1242.c

ad1242,转换程序

#define uchar unsigned char
#define uint  unsigned int
#define ulong unsigned long

#include <reg52.h>
#include <ads1242.h>

void delay(void)
{  uchar i = 10;
   while(i--);
}

void ADS1242_Write_Byte(uchar d)
{  uchar i=8;
   ADS1242_CS=0;
   while(i--)
  { ADS1242_DIN = d & 0X80;
      delay();
	  ADS1242_SCLK = 0;
	  delay();
	  ADS1242_SCLK = 1;
	  delay();
	  d <<= 1;
	}
//	ADS1242_CS=1;
}


uchar ADS1242_Read_Byte(void)
{  uchar i=8,d;   
	ADS1242_CS=0;
   while(i--)
    { d <<=1;
	  if(ADS1242_DOUT==1)
 	    d |= 0x01;
	  else 
 	    d &= 0xfe;	delay();
	  ADS1242_SCLK = 0;  
      delay(); 
      ADS1242_SCLK = 1;        	   	  	  
	}    
//	ADS1242_CS=1;
   return d;
}


void  ADS1242_Write_Reg(uchar reg_name, uchar reg_data)
{  ADS1242_Write_Byte(CMD_WREG + reg_name);
   ADS1242_Write_Byte(0x00);
   ADS1242_Write_Byte(reg_data);
}

void ADSelf_Calibrate()
{

	ADS1242_PDWN=1;
    ADS1242_CS=0;
    ADS1242_Write_Byte(CMD_RESET);
    ADS1242_Write_Reg(REG_SETUP, BURNOUT_CURRENT_OFF + PGA_1);
    ADS1242_Write_Reg(REG_MUX, POSITIVE_AIN0 + NEGTIVE_AIN1);    
    ADS1242_Write_Reg(REG_ACR, UNIPOLAR + SPEED_HIGH + BUFFER_ON + MSB_FIRST + VREF_2_5V + DATA_RATE_3_75);
   	ADS1242_Write_Reg(REG_ODAC, 0x00);
    ADS1242_Write_Reg(REG_IOCON,0x00);
 
    ADS1242_Write_Byte(CMD_SELFCAL);//  \nSelf Calibrating...
 //   while(ADS1242_DRDY == 1);
}