LCD1602 display, with 4-bit bus display numbers, characters, custom characters, strings, cursors

/******************************************* program name:   1602 LCD Clock program writing time: October 4, 2015 hardware support: LCD1602 LCD screen   &NBSP;STC12C4052AD external 12MHZ crystal oscillator   Wiring definition:db7 --> p1^7db6 --> p1^6db5 -->  p1^5db4 --> p1^5rs   = p3 ^ 2;  rw   =  P3 ^ 3; E    = P3 ^ 4;  function: LCD1602 display, with 4-bit bus display numbers, characters, Custom characters, strings, cursors *******************************************/#include  <AT89X52.h>       //  Include header files  //typedef unsigned char       uint8;   //  unsigned 8-bit integer variable  //#define   LCD1602_DB0_DB7  P1    //  defining the LCD1602 data bus sbit lcd1602_rs   = p3 ^ 2;      //  define LCD1602 's RS control line sbit lcd1602_rw   = p3 ^ 3;      //  Define the RW control line of the LCD1602 sbit lcd1602_e    = p3 ^ 4;      //  define LCD1602 's e control line sbit lcd1602_busy = p1 ^ 7;        Define LCD1602 lines (associated with LCD1602_DB0_DB7)//  define LCM2402 instruction set  //  (see Technical Manual for details) #define           CMD_clear         0x01              //  Clear Screen #define          cmd_back          0x02              // ddram back to 0-bit #define          CMD_dec1           0x04             //  ac (hands) minus 1 after reading, Write #define &nbsp to the left;       cmd_add1           0x06             //  after reading AC (hands) plus 1, Write to the right #define         cmd_dis_gb1     0x0f              //  Open Cursor _ open cursor Blinking # #          CMD_dis_gb2     0x0e              //  on display _ Open cursor _ off cursor blink #define          CMD_dis_gb3     0x0c              //  on show _ Off cursor blink #define          CMD_OFF_dis     0x08              //  off cursor-off cursor blinking #define         cmd_set82          0x38              // 8 bit bus _2 line display #define          cmd_set81         0x30              // 8-bit bus _1 line display (top row) #define           CMD_set42         0x28              // 4 bit bus _2 line display #define          CMD_set41         0x20              // 4-bit bus _1 line display (top row) #define           lin_1               0x80              // 4-bit bus _1 line display (top row) #define           lin_2                0xc0              // 4 bit bus _1 line display (top row) void delay_ms  (unsigned int a)  {     unsigned int i;    while  ( --a != 0 )     {  for  (i=0;i<=600;i++);     }}  lcd1602 is busy, if LCD1602 is busy, this function waits to non-busy state  //void lcd1602_testbusy (void) {     lcd1602_db0_db7 = 0xff;  //Device Read Status     LCD1602_RS = 0;     lcd1602_rw = 1;    lCd1602_e = 1;    while (lcd1602_busy);   //wait for LCM not busy      LCD1602_E = 0;    }//  Write instruction program  //void lcd1602_writecmd (uint8  lcd1602_command)  {    lcd1602_testbusy ();    lcd1602_rs =  0;   LCD1602_RW = 0;   LCD1602_DB0_DB7 =  (lcd1602_ COMMAND/16) <<4; //The result to the left 4 bits, the same as the *16 effect    lcd1602_e = 1;   delay _ms (5);  //  Modify the delay, change the display speed    lcd1602_e = 0;   lcd1602_db0_ db7 =  (lcd1602_command%16) <<4; //The result to the left 4 bits, the same as the *16 effect    LCD1602_E =  1;   delay_ms (5);  //  Modify the delay, change the display speed    lcd1602_e = 0;}   Write Data program  //void lcd1602_writedata (uint8 lcd1602_data) {    lcd1602_ Testbusy (); &NBSP;&NBSP;&NBSP;LCd1602_rs = 1;   lcd1602_rw = 0;   lcd1602_db0_db7 =   (LCD1602_DATA/16) <<4;//The result to the left 4-bit, same as the *16 effect    LCD1602_E = 1;    delay_ms (5);  //  Modify the delay, change the display speed    LCD1602_E = 0;    lcd1602_db0_db7 =  (lcd1602_data%16) <<4;//The result to the left 4 bits, the same as the *16 effect    lcd1602_e =  1;   delay_ms (5);  //  Modify the delay, change the display speed    lcd1602_e = 0 ;}  //  Print String Program     (this function calls pointer function) length within 48 characters  void print (UINT8&NBSP;A,UINT8&NBSP;*STR) {   lcd1602_writecmd (a | 0x80);   while (*str !=  ') {  LCD1602 _writedata (*str++);  } *str = 0;}   Print single character program  // void print2 (uint8 a,uint8 t) {  lcd1602_writecmd (a | &NBSP;0X80);   lcd1602_writedata (t);}   Custom character   can write 16 literal characters altogether,The display can be extracted directly after writing with its Cgram code. Uint8 code xword[]={    0x18,0x18,0x07,0x08,0x08,0x08,0x07,0x00,  //℃, Code  0x00    0x00,0x00,0x00,0x00,0xff,0x00,0x00,0x00,  //One, code  0x01     0x00,0x00,0x00,0x0e,0x00,0xff,0x00,0x00,  //Two, Code  0x02     0x00,0x00,0xff,0x00,0x0e,0x00,0xff,0x00,  //Three, code &NBSP;0X03&NBSP;&NBSP;&NBSP;&NBSP;0X00,0X00,0XFF, 0xf5,0xfb,0xf1,0xff,0x00,  //Four, code  0x04    0x00,0xfe,0x08,0xfe,0x0a,0x0a, 0xff,0x00,  //Five, Code  0x05    0x00,0x04,0x00,0xff,0x00,0x0a,0x11,0x00,   //Six, Code  0x06    0x00,0x1f,0x11,0x1f,0x11,0x11,0x1f,0x00,  //day, code   0x07};void cgramwrite (void)  { //  loading cgram //    uint8 i;     lcd1602_writecmd (0x06);    // cgram address Auto plus 1     LCD1602_writecmd (0x40)    // cgram address is set at 00     for (i=0;i<64;i++)  {     lcd1602_writedata (Xword[i]);//  write data by array     }}//  LCD1602 initialization  //(user customizable, add  *  line must be retained but modifiable) void lcd1602_init (void) {   lcd1602_ Writecmd (CMD_SET42); //*  display mode setting: 4-bit data display 2 lines,    lcd1602_writecmd (cmd_set42);  //*   must run once more! Or it's going to go wrong.    lcd1602_writecmd (cmd_clear); //   Display clear Screen    lcd1602_writecmd ( Cmd_back) The;  //*  data pointer points to the 1th line 1th character position    lcd1602_writecmd (CMD_ADD1);   //    Display cursor Movement settings: text does not move, the cursor moves right    lcd1602_writecmd (CMD_DIS_GB1);  //   Display on and cursor settings: Display on, cursor on, flashing open    cgramwrite ();     //   write custom characters to Cgram} void main  (void) {  lcd1602_init ();//lcd1602 initialization      while (1) {    print2 (0x80, 1+0x30);   //  shows the number 1  print2 (0x40,5+0x30);   //  on line 1th 1th digit Display the number 2  print2 (0x85,0x05) on line 1th 1th Digit;     //  The custom character in the 1th line 5th bit    Print2 (0x88,0xe4);     //  upeer 4bit 1110 in 1th row 9th place  ASCII    lower 4bit 0100 corresponding  μ delay_ms (a);  //  open cursor display, flashing, A bouncing cursor is displayed after μ   print2 (0x81, ' D ');     //  displays the custom character in the 5th bit of line 1th    print  (0x42, "www.51cto.com");  //Prints the "blog.51cto.com" string   print  (0x8e, "HI") from left to right at the first place on line 2nd;  //print "Hi" string from left to right at 15th place on line 1th   } } //LCD1602  display numbers, characters, custom characters, strings, cursors

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LCD1602 display, with 4-bit bus display numbers, characters, custom characters, strings, cursors