单片机程序 两个数的相加

Posted 2023-02-16

两个数相加，将和的高位存在#40H，地位存在#41H

这是个比你要求还复杂的东东，计算器。

声明，此货不是我写的，是仿真软件proteus自带的。

附件发一个，图片抓一个，程序也贴出来

其他就看你自己了哈

首先，用吃奶的力气去看懂它，一点点的摸索，一点点的掌握

然后，理解整体方法

再然后，自己从头写起

再然后，反复调试到成功为止

OK，你进步非常多了

 

 

/*******************************************************************************
************                 LABCENTER ELECTRONICS                  ************                             
************       Proteus VSM Sample Design Code             ************    
************        Integer Calculator ( 2K Code Limit)         ************
*******************************************************************************/

#include <intrins.h>
#include <reg51.h>
#include "calc.h"

//Variables
static  data LONG lvalue;
static  data LONG rvalue;
static  data CHAR currtoken;
static  data CHAR lasttoken;
static  data CHAR lastpress;
static  xdata CHAR outputbuffer[MAX_DISPLAY_CHAR];

VOID main (VOID)
//Initialise our variables and call the
//Assembly routine to initialise the LCD display.
  lvalue    = 0;
   rvalue    = 0;
   currtoken = '=';
   lasttoken = '0';
   initialise();  // Initialize the LCD
   calc_output(OK);
   calc_evaluate();
   

VOID calc_evaluate()
  CHAR data key;
   INT  data i;
   CHAR xdata number[MAX_DISPLAY_CHAR];
   CHAR xdata *bufferptr;
  
   // Clear the buffer before we start.
   for (i = 0; i <= MAX_DISPLAY_CHAR; i++)
      number[i] = ' ';
  
   bufferptr = number; 
  
   for (;;)
     key = calc_getkey();
    if (calc_testkey(key))
       // Key test positive for digit so we read it into the
       // buffer and then write the buffer to the screen/LCD.
    // Size limit the number of digits - allow for termination
    // and possible negative results.
          if (bufferptr != &number[MAX_DISPLAY_CHAR - 2])
               *bufferptr = key;
                 calc_display(number);
                 bufferptr++;
              
         

       else
       // Key is an operator so pass it to the function handlers.
       // If we are just after startup or cancel then assign to lvalue
       // otherwise assign to rvalue.
         
      //Assign the value.
            if (lasttoken == '0')
               lvalue = calc_asciidec (number);
            else
               rvalue = calc_asciidec (number);

            //Clear the number buffer.
            bufferptr = number;
            for (i = 0;i <= MAX_DISPLAY_CHAR; i++)
               number[i] = ' ';
  
            //Process the Operator.
            currtoken = key;
   if (currtoken == 'C')
      calc_opfunctions(currtoken);
    else
      calc_opfunctions(lasttoken);
  
       // Clear the outputbuffer for reuse on next operation.
            for (i = 0;i <= MAX_DISPLAY_CHAR;i++)
               outputbuffer[i] = ' ';
       
            bufferptr = number;
   // Handle the equals operation here for brevity.
   // All we need do is preserve the previous operator in
   // lasttoken.
   if (currtoken != 0x3D) lasttoken = currtoken;
           
      
       lastpress = key;
    
 

VOID calc_opfunctions (CHAR token)
// Handle the operations. Lvalue holds the result and we test for
// consecutive operator presses.
  CHAR data result;
   switch(token)
        // Add.
       case '+' : if ((currtoken == '=' ) || ((lastpress >= 0x30) && (lastpress <=0x39)))
               lvalue += rvalue;
               result = calc_chkerror(lvalue);
      
          else
            result =  SLEEP;   break;
        // Subtract.
  case '-' : if ((currtoken == '=' ) || ((lastpress >= 0x30) && (lastpress <=0x39)))
                      lvalue -= rvalue;
                        result = calc_chkerror(lvalue);  
      
                   else
                      result = SLEEP;  break;
        // Multiply.
  case '*' : if ((currtoken == '=' ) || ((lastpress >= 0x30) && (lastpress <=0x39)))
                      lvalue *= rvalue;
                        result =  calc_chkerror(lvalue);
                     
                   else
                      result =  SLEEP;  break;
  // Divide.    
  case '/' : if ((currtoken == '=' ) || ((lastpress >= 0x30) && (lastpress <=0x39)))
                      if (rvalue)
                           lvalue /= rvalue;
                             result = calc_chkerror(lvalue);
                          
                        else
                           result = ERROR;    
                     
                   else
                      result = SLEEP;  break;
  // Cancel.
   case 'C' : lvalue = 0;
                   rvalue = 0;
                   currtoken = '0';
                   lasttoken = '0';
                   result = OK;       break;
 
  default :  result = SLEEP; 

     
   calc_output(result);
 

 
/************************************************************************
***** Utility Routines *****
***************************/

INT calc_chkerror (LONG num)
// Check upper and lower bounds for the display.
// i.e. 99999999 and -99999999.
  if ((num >= -9999999) && (num <= 9999999))
      return OK;
   else
      return ERROR;
 

VOID calc_output (INT status)
// Output according to the status of the operation.
// *Sleep* is used for the first op press after a full cancel
// or on startup. 
  switch (status)
      case OK      : calc_display(calc_decascii(lvalue));    break;
        case SLEEP   :                                         break;
  case ERROR   : calc_display("Exception ");      break; 
        default      : calc_display("Exception ");         break;
     
 

LONG calc_asciidec (CHAR *buffer)
// Convert the ASCII string into the floating point number.
  LONG data value;
   LONG data digit;
   value = 0;
   while (*buffer != ' ')
      digit = *buffer - 48;
     value = value*10 + digit;
        buffer++;
  
   return value;
 

CHAR *calc_decascii (LONG num)
// A rather messy function to convert a floating
// point number into an ASCII string.
  LONG data temp = num;
   CHAR xdata *arrayptr = &outputbuffer[MAX_DISPLAY_CHAR];
   LONG data divisor = 10;
   LONG data result;
   CHAR data remainder,asciival;
   INT  data i;
  
   // If the result of the calculation is zero
   // insert a zero in the buffer and finish.
   if (!temp)
      *arrayptr = 48;
     goto done;
  
   // Handle Negative Numbers.
   if (temp < 0)
      outputbuffer[0] = '-';
     temp -= 2*temp;
  

   for (i=0 ; i < sizeof(outputbuffer) ; i++)
      remainder = temp % divisor;  
        result = temp / divisor;
    
  // If we run off the end of the number insert a space into
     // the buffer.
     if ((!remainder) && (!result))
         *arrayptr = ' ';
  
     // We're in business - store the digit offsetting
     // by 48 decimal to account for the ascii value.
     else
        asciival = remainder + 48;
       *arrayptr = asciival;
    
   
  temp /= 10;
     // Save a place for a negative sign.
     if (arrayptr != &outputbuffer[1]) arrayptr--;
   
   done: return outputbuffer;
 

CHAR calc_testkey (CHAR key)
// Test whether the key is a digit or an operator. Return 1 for digit, 0 for op.
  if ((key >= 0x30) && (key <= 0x39))
      return 1;
   else
      return 0;
 

/************************************************************************
***** I/O Routines *****
***********************/

CHAR calc_getkey (VOID)
// Use the input routine from the *Keypad_Read* assembly file to
// Scan for a key and return ASCII value of the Key pressed.
CHAR data mykey;
  do mykey = input();
     while (mykey == 0);
  return mykey;
 

VOID calc_display (CHAR buf[MAX_DISPLAY_CHAR])
// Use the Output and Clearscreen routines from the
// *LCD_Write* assembly file to output ASCII values to the LCD.
  INT data  i = 0;
   clearscreen();
   for (i ; i <= MAX_DISPLAY_CHAR ; i++)
      if (buf[i] != ' ')
      output(buf[i]);
    
 

 

 

 

 

参考技术A 假设相加的两个数，原来就存在于40H和41H.

MOV A, 40H
ADD A, 41H
MOV 41H, A
CLR A
MOV ACC.0, C
MOV 40H, A
;完本回答被提问者采纳 参考技术B 假设相加的两个数，原来就存在于40H和41H.
MOV
A,
40H
ADD
A,
41H
MOV
41H,
A
CLR
A
MOV
ACC.0,
C
MOV
40H,
A
;完