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標題: 單片機驅動ADS1115的程序 [打印本頁]

作者: maizimingdou 時間: 2018-5-24 10:12
標題: 單片機驅動ADS1115的程序
#include <reg52.h>
#include <intrins.h>

sbit SCL=P1^0;       //SCL
sbit    SDA=P1^1;       //SDA

sbit led0 = P1^2;
sbit led1 = P1^3;

unsigned char Initdata[4]={0};

code unsigned char seg7code[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0xff}; //不帶小數點的共陽數碼管段碼
code unsigned char seg7codeB[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,0xff}; //帶小數點的共陽數碼管段碼

unsigned int date;

unsigned char cnt;

//******************延時子程序 *******************************
void delay(unsigned char i)
{
for(i;i>0;i--);
}

void delay1ms(unsigned char t)
{
unsigned char i;
unsigned char j;
for(i=124;i>0;i--);
for(j=0;j<t;j++);
}

/****************************開始ADC通信*************************/
void StartADcom()
{
SDA =0;
  SCL=1;
  delay(100);
  SDA =1;
  delay(20);
  SDA =0;
  SCL=0;
  delay(10);
}

/***********************************停止ADC通信**************************************/
void StopADcom()
{
  SDA=0;
  delay(10);
  SCL=1;
  delay(20);
  SDA=1;
  delay(10);
}
/********************************單字節I2C傳輸**************************************/
void Send_Byte(unsigned char byte)
{
  unsigned char i;
  for(i=0;i<8;i++)
  {
if((byte<<i)&0x80)
   SDA=1;
else
   SDA=0;
   delay(5);
   SCL=1;
   delay(10);
SCL=0;
delay(10);
}
  delay(5);
  SDA=1;
  delay(5);
  SCL=1;
  delay(10);
  SCL=0;
  delay(10);
}
/*************************讀取一個字節*****************************/
unsigned char Read_Byte()
{
  unsigned char temp=0;
  unsigned char i;
  for(i=0;i<8;i++)
{
temp=temp<<1;    //shift left to receive next bit
SCL=0; //set clock high
delay(10);
SCL=1;
_nop_();
delay(5);
if(SDA==1) //check if Data=high
temp|=0x01;       //yes - set bit high
_nop_();
delay(10);
}
  SCL=0;
  delay(5);
  SDA=0;
  delay(5);
  SCL=1;
  delay(20);
  SCL=0;
  delay(5);
  SDA=1;
  return temp;
}
/**************************配置ADC轉換芯片*************************************/
void Confige1115(unsigned char channel_x)
{
  unsigned char i=0;
  unsigned char a_channel;
  switch(channel_x)
{
case 1:
a_channel=0x42;
break;

case 2:
a_channel=0x52;
break;

case 3:
a_channel=0x62;
break;

case 4:
a_channel=0x72;
break;

default:
break;
}
  Initdata[0] =0x90;
  Initdata[1] =0x01;
  Initdata[2]=a_channel;
  Initdata[3] =0x83;
  SCL=1;
  StartADcom();
  for(i=0;i<4;i++)
{
Send_Byte(Initdata[i]);
delay(20);
}
  StopADcom();
}
/********指向轉換結果寄存器**************************/
void Pointregister(void)
{
  unsigned char i=0;
  Initdata[0] =0x90;
  Initdata[1] =0x00;
  SCL=1;
  StartADcom();
  for(i=0;i<2;i++)
  {
   Send_Byte(Initdata[i]);
delay(20);
}
  StopADcom();
  delay(10);
}
/*****************讀取ADC轉換結果*******************/
unsigned int Read1115(void)
{
  unsigned char ResultL,ResultH;
  unsigned int Result;
  Initdata[0] =0x91;
  SCL=1;
  StartADcom();
  delay(10);
  Send_Byte(Initdata[0]);
  delay(20);
  ResultH=Read_Byte();
  delay(10);
  ResultL=Read_Byte();
  StopADcom();
  Result=ResultH*256+ResultL;
  return Result;
}
/*****ADC模擬量采集轉化為數字量*********/
unsigned int  Ad_1115(unsigned char channel_Ad)
{
unsigned int adc_value;
Confige1115(channel_Ad);
delay1ms(1);
Pointregister();
delay(10);
adc_value=Read1115();
return adc_value;
}

//********************顯示函數****************
void display()
{
   P2=0xfe;    //P1.0=0，選通第一位
   P0=seg7codeB[date/10000];  //十位數，查表，輸出
   delay1ms(1);
   P0=0xff;       //消隱

   P2=0xfd;    //P1.1=0,選通第二位，個位數
   P0=seg7code[date%10000/1000];
   delay1ms(1);
   P0=0xff;    //消隱

   P2=0xfb;    //P1.3=0,選通第三位，小數點第一位
   P0=seg7code[date%1000/100];
   delay1ms(1);
   P0=0xff;       //消隱

   P2=0xf7;    //P1.3=0,選通第四位，小數點第二位
   P0=seg7code[date%100/10];
   delay1ms(1);
   P0=0xff;    //消隱
}

void Timer1Init(void)
{
TMOD &= 0x0F;
TMOD |= 0x10;
TL1 = 0x00;
TH1 = 0xff;
TF1 = 0;
TR1 = 1;
}

//**************************** //主程序
main()
{
Timer1Init();
EA = 1;
ET1 = 1;
while(1)
{
   //date=Ad_1115(1) * 1.2;
   display();
   if(date>40000)
   {
led0 = 1;
led1 = 0;
}
else if(date>35000)
   {
led0 = 0;
delay(50);
led0 = 1;
led1 = 0;
}
else if(date>15000)
   {
led0 = 0;
led1 = 1;
}
else
   {
led0 = 0;
delay(1);
led0 = 1;
led1 = 1;
}
}
}

void Timer1_isr(void) interrupt 3
{
ET1 = 0;
TH0=0x00;
TL0=0xff;
cnt = cnt + 1;
if(cnt == 1)
{
cnt = 0;
date=Ad_1115(1) * 1.2;
//display();
}
ET1 = 1;

}

作者: 軍志 時間: 2018-7-20 16:12
能不能發個原理圖出來啊

作者: bifxv 時間: 2019-9-30 16:01
同上，確實只有代碼看著暈。

作者: 孫琪123 時間: 2019-10-16 15:33
我把這個程序進行了編譯，那示波器看這個SCL和SDA,兩條線都統一被拉高了，沒有數據變化呀

作者: 七彩的夢想 時間: 2025-5-24 00:07
測試了一下，好像不能用

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