Single chip electronic password lock subroutine

Simulation file and complete source code download address: http://www.51hei.com/bbs/dpj-22586-1.html
Thesis download address: http://www.51hei.com/f/Electronic password lock thesis final draft.docx
Below is the mima.c subroutine:

#include
#include "mima.h"
#include "1602.h"
#include "矩阵键盘.h"
#include "delay_ms.h"

/*Compare password function , return 1 if the password is correct, return 0 if it is incorrect*/

bit mimaduibi(unsigned char *string1,unsigned char *string2)
{
 unsigned char count;
 for(count = 0; count < 6; count++)
 {
  if(string1[count] != string2[count])
  return 0;
 }
 return 1;
}

/*Select the password input or password change function, the password input returns A, the password change returns B*/

unsigned char step_choose(void)//Select to input password or modify password processing function
{
 uchar key;
 key = 0xff;
 write_com(0x06);//Address pointer plus 1 after writing a character 
    write_com(0x01);//Display clear, data pointer clear
 lcd_pos(0,0);
 write_n_char(" Input password ");
 lcd_pos(1,0);
 write_n_char(" Press key A "); 
 while((key != A) && (key != B))
  key = keyscan(); 
 return key;
}
/*Password input function, returns 1 if the password is correct, returns 0 if the password is wrong*/

bit  input_mima(uchar * mima)//Password input function
{
 unsigned char count,key;
 lcd_pos(1,0);
 for(count = 0; count < 7; count++)
 {
  delay_ms(100);
  if(count < 6)
  {
   do{key = keyscan();}//Scan keyboard
   while(key == 0xff);
   if((key != backspace) && (key != A) && (key != enter))//Neither backspace nor confirm key
   {
    write_data('*');//It is a numeric key display*
    mima[count] = key;
   // continue;
   }
   if(key == backspace)//It is a backspace key
   {
    if(count > 0)
    {
        lcd_pos(1,--count);//Move the cursor forward one
     positionwrite_data(' ');//Clear one
     positionmima[count] = ' ';//Write emptylcd_pos
     (1,count);
     count--;//The password counter decreases by one, because it will be +1 after the loop, so we need to add 1 here
    }
   }
   if(key == enter)//Password input is not completed and error message is returned
   {
    lcd_pos(0,0);
    return(0);
   }
  }
  if(count==6)
  {
   do{key = keyscan();}
   while((key != backspace)&&(key != enter));
   if(key == backspace)
   {
    lcd_pos(1,--count);
    write_data(' ');
    mima[count]=' ';
    lcd_pos(1,count);
    count--;
   }
   if(key == enter)//The number of digits in the password is correct
   {
    return(1);//Return 1 correct signal
   }
  }
 }
 
}