main.h

This LCD sample application shows how to control HD44780-based character LCD (by Victor Golutvin, corrections by David Hobday).


#ifndef _MAIN_H_
#define _MAIN_H_
////////////////////////////////////////////////////////////////////
// David Hobday 22/09/2003 - Correction:
// 1) Corrected port details, that where previously incorrect to 
// work with 16F84
// 2) Detailed required connections
//
// David Hobday 07/09/2003 - Correction:
// 1) R/W Pin should be connected to VSS - was VDD.
//

// Connections required, if the following port definitions are used
// RS RA1
// R/W   VSS - tied to 0V
// E  RA0
//
// DB0 None
// DB1 None
// DB2 None
// DB3 None
// DB4 RB4
// DB5 RB5
// DB6 RB6
// DB7 RB7

// Ports naming
#define LCD         portb
#define CONTROL     porta

// PINs naming
#define LCD_E       0
#define LCD_RS      1

// Some usefull macroses
#define LCD_E_U     set_bit(CONTROL,LCD_E)
#define LCD_E_D     clear_bit(CONTROL,LCD_E)
#define LCD_RS_U    set_bit(CONTROL,LCD_RS)
#define LCD_RS_D    clear_bit(CONTROL,LCD_RS)
#define SetPos(line,pos) LCD_cmd(0x80 + line*0x40 + pos)
#define byte    unsigned char

// Use nested macroses
#define write_data  LCD_RS_U; LCD_E_U; LCD_E_D;
#define write_cmd   LCD_RS_D; LCD_E_U; LCD_E_D;

// Function prototypes 
void ph1(byte data);
void LCD_char(byte data);
void LCD_cmd(byte data);
void LCD_icmd(byte data);
void Hex2Dec(byte data);
void PHex(byte data);
void init_LCD(void);
void printf( const char* text );

#endif //_MAIN_H_

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