51 Single Chip Microcomputer Driving Design for LCD1602 LCD

51 single-chip - LCD1602 1,1602 LCD read / write timing (1), reading status RS = L, R / W = H, E = H. (Judgment is busy after the bus is released) (2) Read data RS = H, R / W = H, E = H. (3), write instructions RS = L, R / W = L, D0 ~ D7 = instruction code, E = high pulse (4), write data RS = H, R / W = L, D0 ~ D7 = data, E = high pulse 2, LCD display driver file #include #define LCD1602_DB P0 SBIT LCD1602_RS = P1 ^ 0; SBIT LCD1602_RW = P1 ^ 1; SBIT LCD1602_E = P1 ^ 5; / * Wait for liquid crystal ready * / Void LcdwaitReady () { UNSIGNED Char STA; LCD1602_DB = 0xFF; LCD1602_RS = 0; LCD1602_RW = 1; DO { LCD1602_e = 1; STA = LCD1602_DB; // Read status word LCD1602_e = 0; } While (sta & 0x80); // bit7 is equal to 1 means the liquid crystal is busy, repeatedly detected until it is equal to 0 } / * Writing a byte command to LCD1602 LCD, cmd - to write command value * / Void LCDWRITECMD (UNSIGNED Char CMD) { LCDWAITREADY (); LCD1602_RS = 0; LCD1602_RW = 0; LCD1602_DB = cmd; LCD1602_e = 1; LCD1602_e = 0; } / * Write one byte data to LCD1602 LCD, DAT - to write data value * / Void LCDWRITEDAT (UNSIGNED Char Dat) { LCDWAITREADY (); LCD1602_RS = 1; LCD1602_RW = 0; LCD1602_DB = DAT; LCD1602_e = 1; LCD1602_e = 0; } / * Set the display of the RAM start address, that is, the cursor position, (x, y) - the character coordinate on the corresponding screen * / Void LCDSetCursor (unsigned char x, unsigned char y) { UNSIGNED CHAR ADDR; IF (y == 0) // Calculate the address of the RAM by the input screen coordinate { Addr = 0x00 + x; // The first line character address starts from 0x00 } Else { Addr = 0x40 + x; // The second line character address starts from 0x40 } LCDWRITECMD (Addr | 0x80); // Setting a RAM address } / * Display strings on LCD, (x, y) - the start coordinate on the corresponding screen, STR-string pointer * / Void LCDSHOWSTR (Unsigned char y, unsigned char y, unsigned char * STR) { LCDSETCURSOR (X, Y); // Set the start address While (* str! = '\ 0') // Continuously write string data until the end of the end { LCDWRITEDAT (* STR ++); } } / * Initialization 1602 LCD * / VoidinitLCD1602 () { LCDWRITECMD (0x38); // 16 * 2 shows, 5 * 7 o'clock, 8-bit data interface LCDWRITECMD (0x0c); // Display, cursor off LCDWRITECMD (0x06); // Text does not move, address automatic +1 LCDWRITECMD (0x01); // clear screen }, Read the full text

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