51单片机ADS1118程序

Main.c
#include "ads1118.h"
void Init(void) // 此函数方便串口调试
{
TMOD = 0X20;
TH1 = 0XF3;
TL1 = 0XF3;
TR1 = 1;
SM1 = 1;SM0 = 0;
REN = 1;
TI = 1;
}
float Volt_Value;
void main(void)
{
uint value;
Init();
EA = 1;
ADS1118_Init();
Write_ADS1118(CONFIG_VALUE,0);
while(1)
{
delay_ms(1000);
value = ADS_SEL_Read(0,4); //0.512V
printf("value = %d\n\r",value);
Volt_Value = value*0.512/32768; // 第二次转换时读出的是前一次的电压
printf("Volt_Value %f\n\r\n\r",Volt_Value);
}
}
Ads1118.c
#include "ads1118.h"
void delay_ms(uint z)
{
uint x;
for(;z>0;z--)
for(x=120;x>0;x--);
}
void ADS1118_Init(void)
{
CS_H;
SCLK_H;
MOSI_L;
}
union aa
{
uint dat1[2];
ulong dat2;
};
uint Write_ADS1118(uint dat,uchar mode)
{
// uint temp;
union aa temp;
union aa temp1;
// ulong Value;
uchar i;
if(mode == 1) dat |= 0x8000;
temp.dat1[1] = dat;
temp.dat1[0] = dat;
SCLK_L;
CS_L;
delay_ms(1);
for(i=0;i<32;i++)
{
if(temp.dat2 & 0x80000000)MOSI_H;
else MOSI_L;
temp.dat2 <<= 1;
_nop_();
SCLK_H;
_nop_();
SCLK_L;
_nop_();
temp1.dat2 <<= 1;
if(READ_MISO)temp1.dat2 |= 0x01;
_nop_();
}
CS_H;
SCLK_L;
MOSI_L;
MISO_L;
printf("temp %d\n\r",temp1.dat1[0]);
printf("temp %#X\n\r",temp1.dat1[1]);
return temp1.dat1[0];
}
int ADS_SEL_Read(uchar road,uchar Ref) // 测几路电压
{
int dat = 0;
uint Config_Value = 0x008b; // 默认低8 位，DOUT 带上拉电阻switch(road)
{
case 0: Config_Value += 0x0000;break; //AINP = AIN0 and AINN = AIN1 (default)
case 1: Config_Value += 0x1000;break; //AINP = AIN0 and AINN = AIN3
case 2: Config_Value += 0x2000;break; //AINP = AIN1 and AINN = AIN3
case 3: Config_Value += 0x3000;break; //AINP = AIN2 and AINN = AIN3
case 4: Config_Value += 0x4000;break; //AINP = AIN0 and AINN = GND
case 5: Config_Value += 0x5000;break; //AINP = AIN1 and AINN = GND
case 6: Config_Value += 0x6000;break; //AINP = AIN2 and AINN = GND
case 7: Config_Value += 0x7000;break; //AINP = AIN3 and AINN = GND
default : break;
}
switch(Ref)
{
case 0: Config_Value += 0x0000;break; //000 : FS = ± 6.144V(1)
case 1: Config_Value += 0x0200;break; //001 : FS = ± 4.096V(1)
case 2: Config_Value += 0x0400;break; //002 : FS = ± 2.048V(1)
case 3: Config_Value += 0x0600;break; //003 : FS = ± 1.024V(1)
case 4: Config_Value += 0x0800;break; //004 : FS = ±0.512V(1)
case 5: case 6: case 7: Config_Value += 0x0a00;break; //005 : FS = ±0.256V(1)
default : break;
}
CS_L;
dat = Write_ADS1118(Config_Value,1);
_nop_();
CS_H;
return dat;
}
Ads1118.h
#include <reg52.h>
#include <stdio.h>
#include <intrins.h>
typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;
#define CONFIG_VALUE 0X038B //AIN0-AIN1 4.096 128sps pull on DOUT sbit SCLK = P2^1;
sbit MOSI = P2^2;
sbit MISO = P2^3;
sbit CS = P2^0;
#define SCLK_H SCLK = 1
#define SCLK_L SCLK = 0
#define MOSI_H MOSI = 1
#define MOSI_L MOSI = 0
#define MISO_H MISO = 1
#define MISO_L MISO = 0
#define CS_H CS = 1
#define CS_L CS = 0
#define READ_MISO P2 & 0X8
void ADS1118_Init(void);
uint Write_ADS1118(uint dat,uchar mode);
void delay_ms(uint z);
int ADS_SEL_Read(uchar road,uchar Ref);。