51 driver 1602 LCD Program

// 1602.h# include <reg52.h> // data type definition typedef unsigned char uchar; typedef unsigned int uint; // 1602 command definition // screen initialization # define screen_init 0x38 // screen setting: 16*2 rows, 5*7 lattice, 8-bit data interface // cursor and screen display settings # define show_screen 0x0c // screen display # define hide_screen 0x08 // the screen is not displayed # define show_cursor 0x02 // display the cursor # define flash_cursor 0x01 // blinking cursor // address pointer and scroll setting # define dptr_inc 0x06 // read/write a byte address pointer + 1, cursor + 1 # define dptr_dec 0x04 // read/write a byte address pointer-1, cursor-1 # define screen_scr 0x01 // write a character, full Screen left shift/right shift // ADDR settings # define addr_line1 0x80 // The first line # define addr_line2 0xc0 // The second line # define line1_end 0x10 # define line2_end 0x50 // busy status # define busy 0x80 // clear screen # define clr_scr 0x01 // clear screen // clear dptr # define clr_dptr 0x02 // Clear Data Pointer

// 1602.c# include <reg52.h> # include <intrins. h> # include "1602.h" // girls do not cry // 2012-10-25 // Ts = STS = Sw = 4 // The following is the port definition, modify sbit rs = P0 ^ 0 on your own; // select sbit RW = P0 ^ 1 for data/instructions; // read/write control sbit E = P0 ^ 2; // enable # define data P2 // data port P [0 ~ 7]-> data [0 ~ 7]/* function: microsecond delay parameter: US [uchar]: microsecond return :( none) */void delay_us (uchar US) {for (; US> 0; us --) _ NOP _ ();}/* function: 10 ms delay parameter: ms10 [uint]: 10 ms return :( none) */void delay_10ms (uint ms10) {uchar X, y, Z; while (ms10 --) {for (x = 5; x> 0; X --); For (y = 4; y> 0; y --); for (Z = 248; z> 0; Z --) ;}/ * function: Read the 1602 status parameter: (none) return :( none) Description: The highest bit is the busy status bit, 1 indicates busy */uchar read_state (void) {DATA = 0xff; RW = 1; RS = 0; E = 1; return data ;}/ * function: execute a command parameter: CMD [uchar]: Command return :( none) */void do_cmd (uchar cmd) {While (read_state () & busy) _ NOP _ (); RS = 0; RW = 0; data = cmd; E = 1; delay_us (50); E = 0; delay_us (50);}/* function: 1602 initialization parameter: (none) returned :( none) */void init_ LCD (void) {do_cmd (clr_scr); // clear screen do_cmd (screen_init); // set the display mode to do_cmd (show_screen | show_cursor/* | flash_cursor */); do_cmd (dptr_inc);}/* function: Write a byte to the memory parameter: ch [uchar]: displays the character ASCII code and returns: (none) */void write (uchar ch) {uchar ADDR; while (read _ State () & busy); // ADDR = read_state ()&~ Busy; If (ADDR = line1_end) do_cmd (addr_line2); else if (ADDR = line2_end) do_cmd (addr_line1); RW = 0; RS = 1; Data = CH; E = 1; delay_us (50); E = 0; delay_us (50);} void write_str (uchar line, uchar POs, uchar * Str) {uchar ADDR; uchar * PTR; if (line! = 1 & line! = 2) return; // only the first and second rows of IF (Pos> 16) return; // only 1st ~ 16 characters // Pos = 0 indicates that the write starts from the current position. Ignore the line if (POS) {ADDR = (line = 1? Addr_line1: addr_line2) + pos-1; do_cmd (ADDR);} For (PTR = STR; * PTR; PTR ++) {write (* PTR); delay_10ms (80 );}} # If 0 void main (void) {uchar STR [16] = {0}; uchar X; delay_10ms (10); init_ LCD (); write_str (1, 1, 012345671 "); delay_10ms (200); write_str (200, "abcdefghijk"); delay_10ms (); write_str (, "NV Hai bu Ku! "); Delay_10ms (200); do_cmd (clr_scr); do_cmd (show_screen | flash_cursor); write_str (1, 1," This is a very long string! "); For (x = 0; x <4; X ++) {do_cmd (hide_screen); delay_10ms (300); do_cmd (show_screen); delay_10ms (300 );} do_cmd (show_screen); delay_10ms (200); do_cmd (clr_scr); write_str (1,1, "screen will now scroll .... "); delay_10ms (300); do_cmd (dptr_inc | screen_scr); write_str (," screen scrolling "); do_cmd (dptr_dec | screen_scr); write_str, "screen scrolling"); do_cmd (dptr_inc); delay_10ms (200); do_cmd (clr_scr); fo R (x = 0x20; x <0xdf; X ++) {write (x); delay_10ms (80);} delay_10ms (200); do_cmd (clr_scr ); write_str (2, 1 ,"... what ?? "); For (;) {}# endif

Girl don't cry (QQ: 191035066) @ 20:02:49 @ http://www.cnblogs.com/nbsofer