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Tài trợ cho PIC Vietnam |
PIC - Thiết kế và Ứng dụng Ý tưởng cho các sản phẩm sử dụng PIC/dsPIC và các sản phẩm của Microchip |
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Ðiều Chỉnh | Xếp Bài |
09-11-2012, 10:43 PM | #11 | |
Đệ tử 7 túi
Tham gia ngày: May 2005
Bài gửi: 258
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Trích:
Code:
#include <16F877a.h> #fuses XT,NOWDT,NOPROTECT,NOLVP #use delay(clock=4000000) #use fast_io(D) #define LCD_ENABLE_PIN PIN_D0 #define LCD_RS_PIN PIN_D1 #define LCD_RW_PIN PIN_D2 #define LCD_DATA4 PIN_D4 #define LCD_DATA5 PIN_D5 #define LCD_DATA6 PIN_D6 #define LCD_DATA7 PIN_D7 #include <LCD.c> void main() { set_tris_D(0x00); lcd_init(); while(1) { lcd_gotoxy(2,1); lcd_putc("fReady..."); delay_ms(100); }} Code:
/////////////////////////////////////////////////////////////////////////////// //// LCD.C //// //// Driver for common LCD modules //// //// //// //// lcd_init() Must be called before any other function. //// //// //// //// lcd_putc(c) Will display c on the next position of the LCD. //// //// The following have special meaning: //// //// \f Clear display //// //// \n Go to start of second line //// //// \b Move back one position //// //// //// //// lcd_gotoxy(x,y) Set write position on LCD (upper left is 1,1) //// //// //// //// lcd_getc(x,y) Returns character at position x,y on LCD //// //// //// //// CONFIGURATION //// //// The LCD can be configured in one of two ways: a.) port access or //// //// b.) pin access. Port access requires the entire 7 bit interface //// //// connected to one GPIO port, and the data bits (D4:D7 of the LCD) //// //// connected to sequential pins on the GPIO. Pin access //// //// has no requirements, all 7 bits of the control interface can //// //// can be connected to any GPIO using several ports. //// //// //// //// To use port access, #define LCD_DATA_PORT to the SFR location of //// //// of the GPIO port that holds the interface, -AND- edit LCD_PIN_MAP //// //// of this file to configure the pin order. If you are using a //// //// baseline PIC (PCB), then LCD_OUTPUT_MAP and LCD_INPUT_MAP also must //// //// be defined. //// //// //// //// Example of port access: //// //// #define LCD_DATA_PORT getenv("SFR:PORTD") //// //// //// //// To use pin access, the following pins must be defined: //// //// LCD_ENABLE_PIN //// //// LCD_RS_PIN //// //// LCD_RW_PIN //// //// LCD_DATA4 //// //// LCD_DATA5 //// //// LCD_DATA6 //// //// LCD_DATA7 //// //// //// //// Example of pin access: //// //// #define LCD_ENABLE_PIN PIN_E0 //// //// #define LCD_RS_PIN PIN_E1 //// //// #define LCD_RW_PIN PIN_E2 //// //// #define LCD_DATA4 PIN_D4 //// //// #define LCD_DATA5 PIN_D5 //// //// #define LCD_DATA6 PIN_D6 //// //// #define LCD_DATA7 PIN_D7 //// //// //// /////////////////////////////////////////////////////////////////////////////// //// (C) Copyright 1996,2009 Custom Computer Services //// //// This source code may only be used by licensed users of the CCS C //// //// compiler. This source code may only be distributed to other //// //// licensed users of the CCS C compiler. No other use, reproduction //// //// or distribution is permitted without written permission. //// //// Derivative programs created using this software in object code //// //// form are not restricted in any way. //// /////////////////////////////////////////////////////////////////////////// // define the pinout. // only required if port access is being used. typedef struct { // This structure is overlayed BOOLEAN enable; // on to an I/O port to gain BOOLEAN rs; // access to the LCD pins. BOOLEAN rw; // The bits are allocated from BOOLEAN unused; // low order up. ENABLE will int data : 4; // be LSB pin of that port. #if defined(__PCD__) // The port used will be LCD_DATA_PORT. int reserved: 8; #endif } LCD_PIN_MAP; // this is to improve compatability with previous LCD drivers that accepted // a define labeled 'use_portb_lcd' that configured the LCD onto port B. #if ((defined(use_portb_lcd)) && (use_portb_lcd==TRUE)) #define LCD_DATA_PORT getenv("SFR:PORTB") #endif #if defined(__PCB__) // these definitions only need to be modified for baseline PICs. // all other PICs use LCD_PIN_MAP or individual LCD_xxx pin definitions. /* EN, RS, RW, UNUSED, DATA */ const LCD_PIN_MAP LCD_OUTPUT_MAP = {0, 0, 0, 0, 0}; const LCD_PIN_MAP LCD_INPUT_MAP = {0, 0, 0, 0, 0xF}; #endif ////////////////////// END CONFIGURATION /////////////////////////////////// #ifndef LCD_ENABLE_PIN #define lcd_output_enable(x) lcdlat.enable=x #define lcd_enable_tris() lcdtris.enable=0 #else #define lcd_output_enable(x) output_bit(LCD_ENABLE_PIN, x) #define lcd_enable_tris() output_drive(LCD_ENABLE_PIN) #endif #ifndef LCD_RS_PIN #define lcd_output_rs(x) lcdlat.rs=x #define lcd_rs_tris() lcdtris.rs=0 #else #define lcd_output_rs(x) output_bit(LCD_RS_PIN, x) #define lcd_rs_tris() output_drive(LCD_RS_PIN) #endif #ifndef LCD_RW_PIN #define lcd_output_rw(x) lcdlat.rw=x #define lcd_rw_tris() lcdtris.rw=0 #else #define lcd_output_rw(x) output_bit(LCD_RW_PIN, x) #define lcd_rw_tris() output_drive(LCD_RW_PIN) #endif // original version of this library incorrectly labeled LCD_DATA0 as LCD_DATA4, // LCD_DATA1 as LCD_DATA5, and so on. this block of code makes the driver // compatible with any code written for the original library #if (defined(LCD_DATA0) && defined(LCD_DATA1) && defined(LCD_DATA2) && defined(LCD_DATA3) && !defined(LCD_DATA4) && !defined(LCD_DATA5) && !defined(LCD_DATA6) && !defined(LCD_DATA7)) #define LCD_DATA4 LCD_DATA0 #define LCD_DATA5 LCD_DATA1 #define LCD_DATA6 LCD_DATA2 #define LCD_DATA7 LCD_DATA3 #endif #ifndef LCD_DATA4 #ifndef LCD_DATA_PORT #if defined(__PCB__) #define LCD_DATA_PORT 0x06 //portb #define set_tris_lcd(x) set_tris_b(x) #else #if defined(PIN_D0) #define LCD_DATA_PORT getenv("SFR:PORTD") //portd #else #define LCD_DATA_PORT getenv("SFR:PORTB") //portb #endif #endif #endif #if defined(__PCB__) LCD_PIN_MAP lcd, lcdlat; #byte lcd = LCD_DATA_PORT #byte lcdlat = LCD_DATA_PORT #elif defined(__PCM__) LCD_PIN_MAP lcd, lcdlat, lcdtris; #byte lcd = LCD_DATA_PORT #byte lcdlat = LCD_DATA_PORT #byte lcdtris = LCD_DATA_PORT+0x80 #elif defined(__PCH__) LCD_PIN_MAP lcd, lcdlat, lcdtris; #byte lcd = LCD_DATA_PORT #byte lcdlat = LCD_DATA_PORT+9 #byte lcdtris = LCD_DATA_PORT+0x12 #elif defined(__PCD__) LCD_PIN_MAP lcd, lcdlat, lcdtris; #word lcd = LCD_DATA_PORT #word lcdlat = LCD_DATA_PORT+2 #word lcdtris = LCD_DATA_PORT-0x02 #endif #endif //LCD_DATA4 not defined #ifndef LCD_TYPE #define LCD_TYPE 2 // 0=5x7, 1=5x10, 2=2 lines #endif #ifndef LCD_LINE_TWO #define LCD_LINE_TWO 0x40 // LCD RAM address for the second line #endif BYTE const LCD_INIT_STRING[4] = {0x20 | (LCD_TYPE << 2), 0xc, 1, 6}; // These bytes need to be sent to the LCD // to start it up. BYTE lcd_read_nibble(void); BYTE lcd_read_byte(void) { BYTE low,high; #if defined(__PCB__) set_tris_lcd(LCD_INPUT_MAP); #else #if (defined(LCD_DATA4) && defined(LCD_DATA5) && defined(LCD_DATA6) && defined(LCD_DATA7)) output_float(LCD_DATA4); output_float(LCD_DATA5); output_float(LCD_DATA6); output_float(LCD_DATA7); #else lcdtris.data = 0xF; #endif #endif lcd_output_rw(1); delay_cycles(1); lcd_output_enable(1); delay_cycles(1); high = lcd_read_nibble(); lcd_output_enable(0); delay_cycles(1); lcd_output_enable(1); delay_us(1); low = lcd_read_nibble(); lcd_output_enable(0); #if defined(__PCB__) set_tris_lcd(LCD_INPUT_MAP); #else #if (defined(LCD_DATA4) && defined(LCD_DATA5) && defined(LCD_DATA6) && defined(LCD_DATA7)) output_drive(LCD_DATA4); output_drive(LCD_DATA5); output_drive(LCD_DATA6); output_drive(LCD_DATA7); #else lcdtris.data = 0x0; #endif #endif return( (high<<4) | low); } BYTE lcd_read_nibble(void) { #if (defined(LCD_DATA4) && defined(LCD_DATA5) && defined(LCD_DATA6) && defined(LCD_DATA7)) BYTE n = 0x00; /* Read the data port */ n |= input(LCD_DATA4); n |= input(LCD_DATA5) << 1; n |= input(LCD_DATA6) << 2; n |= input(LCD_DATA7) << 3; return(n); #else return(lcd.data); #endif } void lcd_send_nibble(BYTE n) { #if (defined(LCD_DATA4) && defined(LCD_DATA5) && defined(LCD_DATA6) && defined(LCD_DATA7)) /* Write to the data port */ output_bit(LCD_DATA4, bit_test(n, 0)); output_bit(LCD_DATA5, bit_test(n, 1)); output_bit(LCD_DATA6, bit_test(n, 2)); output_bit(LCD_DATA7, bit_test(n, 3)); #else lcdlat.data = n; #endif delay_cycles(1); lcd_output_enable(1); delay_us(2); lcd_output_enable(0); } void lcd_send_byte(BYTE address, BYTE n) { lcd_output_rs(0); while ( bit_test(lcd_read_byte(),7) ) ; lcd_output_rs(address); delay_cycles(1); lcd_output_rw(0); delay_cycles(1); lcd_output_enable(0); lcd_send_nibble(n >> 4); lcd_send_nibble(n & 0xf); } void lcd_init(void) { BYTE i; #if defined(__PCB__) set_tris_lcd(LCD_OUTPUT_MAP); #else #if (defined(LCD_DATA4) && defined(LCD_DATA5) && defined(LCD_DATA6) && defined(LCD_DATA7)) output_drive(LCD_DATA4); output_drive(LCD_DATA5); output_drive(LCD_DATA6); output_drive(LCD_DATA7); #else lcdtris.data = 0x0; #endif lcd_enable_tris(); lcd_rs_tris(); lcd_rw_tris(); #endif lcd_output_rs(0); lcd_output_rw(0); lcd_output_enable(0); delay_ms(15); for(i=1;i<=3;++i) { lcd_send_nibble(3); delay_ms(5); } lcd_send_nibble(2); for(i=0;i<=3;++i) lcd_send_byte(0,LCD_INIT_STRING[i]); } void lcd_gotoxy(BYTE x, BYTE y) { BYTE address; if(y!=1) address=LCD_LINE_TWO; else address=0; address+=x-1; lcd_send_byte(0,0x80|address); } void lcd_putc(char s) { switch (s) { case '\f' : lcd_send_byte(0,1); delay_ms(2); break; case '\n' : lcd_gotoxy(1,2); break; case '\b' : lcd_send_byte(0,0x10); break; default : lcd_send_byte(1,s); break; } } char lcd_getc(BYTE x, BYTE y) { char value; lcd_gotoxy(x,y); while ( bit_test(lcd_read_byte(),7) ); // wait until busy flag is low lcd_output_rs(1); value = lcd_read_byte(); lcd_output_rs(0); return(value); }
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viết chương trình cho vdk chạy ổn định là cả một vấn đề. thay đổi nội dung bởi: tdm, 09-11-2012 lúc 10:50 PM. |
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