1602 of 51 programs

#include
#include
#define lcd_bus P0 // data bus
sbit rs =P2^4; // data & instruction selection, H: write data, L: write instruction
sbit rw =P2^3; // read & write selection, H:read, L:write
sbit e =P2^2; // read and write enable
sbit bf =P0^7; // busy and idle status flag, H: internal execution, L: idle
void chk_busy(void); // detect LCD busy and idle
void init_lcd(void); // LCD initialization
void wr_comm(unsigned char comm); // write instruction
void wr_comm_no(unsigned char comm); // write instruction, do not detect busy and idle
void wr_da ta(unsigned char dat); // write data
void wr_str(unsigned char *p); // Display string
unsigned char rd_lcd(void); // Read LCD data
void delayus(unsigned char us); // Delay subroutine us
void delayms(unsigned int ms); // Delay subroutine ms

void main()
{
  delayms(200);
  init_lcd(); // LCD initialization
  wr_comm(0x80); // The first character address of the first line
  wr_str("lcd1602");
  wr_comm(0xc0); // The first character address of the second line
  wr_str("Tai shan Dizn Zi");
  while(1);
}
/*------------------LCD initialization-----------------*/
void init_lcd(void)
{
  wr_comm_no(0x38); // Do not detect busy or idle
  delayms(5);
  wr_comm_no(0x38);
  delayms(5);
  wr_comm_no(0x38);
  delayms(5);
  wr_comm_no(0x38);
  delayms(5);
  wr_comm(0x38); // Set LCD to 16*2 display, 5*7 dot matrix, 8-bit data interface, detect busy signal
  delayus(3); // Delay 11us
  wr_comm(0x08); // Turn off the display, detect the busy signal
  delayus(3);
  wr_comm(0x01); // Clear the screen, detect the busy signal
  delayus(3);
  wr_comm(0x06); // Display cursor automatically moves right, the whole screen does not move, detect the busy signal
  delayus(3);
  wr_comm(0x0c); // Turn on the display, do not display the cursor, detect the busy signal
  delayus(3);
}
/*--------------Detect LCD busy---------------*/
void chk_busy(void)
{
  lcd_bus=0xff;
  rs=0;
  rw=1;
  ;
  e=1;
  while(bf==1);
  e=0;
}
/*------------Write command to LCD--------------*/
void wr_comm(unsigned char comm)
{
  chk_busy();
  rs=0; // H: write data, L: write instruction
  rw=0;
  e=0;
  ;
  lcd_bus=comm; // content
  delayus(3);
  e=1;
  ;
  e=0;
}
/*------------write command to LCD without detecting busy/idle--------------*/
void wr_comm_no(unsigned char comm)
{
  rs=0; // H: write data, L: write instruction
  rw=0;
  e=0;
  ;
  lcd_bus=comm; // content
  delayus(3);
  e=1;
  ;
  e=0;
}
/*------------write data to LCD--------------*/
void wr_dat (unsigned char dat)
{
  chk_busy();
  rs=1; // H: write data, L: write instruction
  rw=0;
  e=0;
  ;
  lcd_bus=dat; // content
  delayus(3);
  e=1;
  ;
  e=0;
}
/*--------------read LCD data---------------*/
unsigned char rd_lcd(void)
{
  unsigned char rd_da ta;
  chk_busy(); // Detect busy
  rs=1;
  rw=1;
  e=1;
  ;
  rd_da ta=lcd_bus;
  e=0;
  return rd_da ta;
}
/*-------------write string----------------*/
void wr_str(unsigned char *s)
{
   while(*s>0) // the string ends with 0
   {
      wr_data (*s);
      s++;
   }
}
/*---------------delay subroutine us----------------*/
void delayus(unsigned char us)
{
  while(--us); // a cycle of 2us
}
/*---------------ms delay subroutine----------------*/
void delayms(unsigned int ms) //delay n ms
{
  while(ms)
  {
  int i;
  i=110;
  while(i--);
  ms=ms-1;
  }
}