STC12C5A60S2 internal AD+1602 display

When I first looked at ADC, I was confused. Later, I looked through the chip manual and found it very detailed and helpful.

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/* Function: Use the internal AD of 12C5A60S2 to read the external three-way voltage and display it on 1602*/ 

/* Up to 8 voltages can be input simultaneously, set P1ASF */

#include <STC12C5A.H>

#include

sbit RS = P2^6; //Define the port used by 1602

sbit RW = P2^5;

sbit EN = P2^7;

#define uchar unsigned char;

#define uint unsigned int;

#define RS_CLR RS=0 

#define RS_SET RS=1

#define RW_CLR RW=0 

#define RW_SET RW=1 

#define EN_CLR EN=0

#define EN_SET EN=1

#define DataPort P0 //Connect to 1602 data port P0             

//uchar b,i,ge,shi,bai;

uchar da1=0,da2=0,da3=0;

double Data,c;

char a[5]="";         

fly ADC_Chanul_Turn=0;

/*------------------------------------------------

 uS delay function, with input parameter unsigned char t, no return value

 unsigned char is used to define an unsigned character variable, whose value range is

 0~255 Here we use a 12M crystal oscillator. Please use assembly for accurate delay. Approximate delay

 The length is as follows: T=tx2+5 uS 

------------------------------------------------*/

void DelayUs2x(unsigned char t)

{   

 while(--t);

}

/*------------------------------------------------

 mS delay function, with input parameter unsigned char t, no return value

 unsigned char is used to define an unsigned character variable, whose value range is

 0~255 Here we use a 12M crystal oscillator. Please use assembly code for accurate delay.

------------------------------------------------*/

void DelayMs(unsigned char t)

{

 while(t--)

 {

     //About 1mS delay

     DelayUs2x(245);

     DelayUs2x(245);

 }

}

/*------------------------------------------------

              Busy detection function

------------------------------------------------*/

 bit LCD_Check_Busy(void) 

 { 

 DataPort= 0xFF; 

 RS_CLR; 

 RW_SET; 

 EN_CLR; 

 _nop_(); 

 EN_SET;

 return (bit)(DataPort & 0x80);    

 }

/*------------------------------------------------

              Write command function

------------------------------------------------*/

 void LCD_Write_Com(unsigned char com) 

 {  

 while(LCD_Check_Busy()); //Wait if busy

 RS_CLR; 

 RW_CLR; 

 EN_SET; 

 DataPort= com;          //

 _nop_(); 

 EN_CLR;

 }

/*------------------------------------------------

              Write data function

------------------------------------------------*/

 void LCD_Write_Data(unsigned char Data) 

 { 

 while(LCD_Check_Busy()); //Wait if busy

 RS_SET; 

 RW_CLR; 

 EN_SET; 

 DataPort= Data; 

 _nop_();

 EN_CLR;

 }

/*------------------------------------------------

                Clear screen function

------------------------------------------------*/

 void LCD_Clear(void) 

 { 

 LCD_Write_Com(0x01); 

 DelayMs(5);

 }

/*------------------------------------------------

              Write String Function

------------------------------------------------*/

 void LCD_Write_String(unsigned char x,unsigned char y,unsigned char *s)//y is the number of rows, x is the horizontal coordinate, and the last one is the character 

 {     

 if (y == 0) 

     {     

     LCD_Write_Com(0x80 + x); // indicates the first line

     }

 else 

     {      

     LCD_Write_Com(0xC0 + x); // indicates the second line

     }        

 while (*s) 

     {     

 LCD_Write_Data( *s);     

 s ++;     

     }

 }

/*------------------------------------------------

              Write character function

------------------------------------------------*/

 void LCD_Write_Char(unsigned char x,unsigned char y,unsigned char Data) 

 {     

 if (y == 0) 

     {     

     LCD_Write_Com(0x80 + x);     

     }    

 else 

     {     

     LCD_Write_Com(0xC0 + x);     

     }        

 LCD_Write_Data( Data);  

 }

/*------------------------------------------------

              Initialization function

------------------------------------------------*/

 void LCD_Init(void) 

 {

   LCD_Write_Com(0x38); /*Display mode setting*/ 

   DelayMs(5); 

   LCD_Write_Com(0x38); 

   DelayMs(5); 

   LCD_Write_Com(0x38); 

   DelayMs(5); 

   LCD_Write_Com(0x38);  

   LCD_Write_Com(0x08); /*Display off*/ 

   LCD_Write_Com(0x01); /*Clear the screen*/ 

   LCD_Write_Com(0x06); /*Display cursor movement settings*/ 

   DelayMs(5); 

   LCD_Write_Com(0x0C); /*Display on and cursor setting*/

   }

/*------------------------------------------------

                  ADC Function

------------------------------------------------*/ 

void InitADC() //initial AD register

{

         P1ASF=0X07; //0xff sets all P1 ports as ADC channels, 0x07=0000,0111 means using P10, P11, P12 as input

        ADC_RES=0X00; //Clear the high 8-bit buffer data

        if(ADC_Chanul_Turn%3==0)//external reference voltage

        {

            ADC_CONTR=0xF0; //AD conversion control register, 1111, 0000 P10 port

            _nop_();

            _nop_();

            _nop_();

            _nop_();

            ADC_CONTR=0xE8; //1110,1000 (clear Flag, set Start)

         }

        if(ADC_Chanul_Turn%3==1)

        {

            ADC_CONTR=0xF1; // 1111,0001 P11 port

            _nop_();

            _nop_();

            _nop_();

            _nop_();

            ADC_CONTR=0xE9;    //1110,1001

         }

         if(ADC_Chanul_Turn%3==2)

        {

            ADC_CONTR=0xF2; //1111,0010 P12 port

            _nop_();

            _nop_();

            _nop_();

            _nop_();

            ADC_CONTR=0xEA;    //1110,1010

         }

}     

void timer0() interrupt 1 //interrupt 1: timer 0, interrupt3: timer 3

{

    TH0=(65536-20000)/256; //High eight bits (need to represent the timing of Xms, the counter counts from 65536-X to 65536, because it is 16 bits, it can only be divided into high and low bits)

    TL0=(65536-20000)%256; //low eight bits

    InitADC();

}

void adc_isr() interrupt 5 //The FLAG flag is set to trigger an interrupt. There is no priority setting, but timer 0 has a higher priority at the same priority level.

{  

   //V_5REF=V_1REF*256/da_ref;

   if(ADC_Chanul_Turn%3==0) //External reference voltage

   {    

       da1=ADC_RES; //Get conversion result

       Data=((double)da1/256)*5; //Get eight bits to calculate the reference voltage Data,

       c =Data;

       } 

   if(ADC_Chanul_Turn%3==1)

   {

       da2=ADC_RES; //Get conversion result

       Data=((double)da2/256)*5; //Get eight bits to calculate the actual value Data,

       c =Data;

       }

   if(ADC_Chanul_Turn%3==2)

   {

       da3=ADC_RES; //Get conversion result

       Data=((double)da3/256)*5; //Get eight bits to calculate the actual value Data,

       c =Data;

       }

   a[0]=((int)c%10+0x30); //units (voltage < 5, only units) //0x30: represents "0" in ASCII code, must be converted into a character and stored in a character array before it can be displayed on the 1602 LCD screen

   a[1]=0x2e; //decimal point

   a[2]=((int)(c*10)%10+0x30); // tenth place

   a[3]=((int)(c*100)%10+0x30);// Percentile

   a[4]='\0'; // Add the end character to make it a string

   if(ADC_Chanul_Turn%3==0)  LCD_Write_String(0,0,a);

   if(ADC_Chanul_Turn%3==1)  LCD_Write_String(5,0,a);

   if(ADC_Chanul_Turn%3==2) LCD_Write_String(0,1,a); 

   ADC_CONTR&=0xEF; // Flag clear

   ADC_Chanul_Turn++;

   if(ADC_Chanul_Turn==252) 

      ADC_Chanul_Turn=0;    

}

void main()

{

    LCD_Init(); 

    LCD_Clear(); //Clearing

    //LCD_Write_String(0,2,"Hello Dog!");

    DelayMs(255);

    TH0=(65536-20000)/256; //Start timer 0

    TL0=(65536-20000)%256;

    EA=1; //Open global interrupt

    ET0=1; //Enable timer zero interrupt

    EADC=1; //Enable ADC interrupt 

    TR0=1;       

    while(1);

}