Отправлено Bill 27 декабря 2004 г. 08:59 В ответ на: Работа с LCD отправлено Валентин 27 декабря 2004 г. 07:54

#include "lcd.h"
//
// Static function prototypes
//
static void LCD_Write(unsigned char _ch);
static void LCD_WrNibl(unsigned char _ch);
static void LCD_CmdWr(unsigned char _ch);
static void LCD_Delay(void);
/*      Global variable locations       */
volatile char   LCDCursor,             // The current cursor position (0-15)
                LCDLine;               // The current line number (0-1)

//
// ** Delay100        -- the routine to do program delay of 0.1 mS
//
void Delay100(void)
        {
        SleepMCU(100);
        }
//
// ** InitLCD        -- routine to initialize LCD display
//
void InitLCD(void)
        {
        unsigned char        _count = 20;
        
        do                // Power turn on delay
                {
                LCD_Delay();
                }
        while (--_count);
        LCD_CmdWr(0x30);
        LCD_CmdWr(LCD_Func);            //Set to 4 bit interface
        LCD_SendCmd(LCD_Func|TwoLin_BIT);// Set to 4 bit interface, 2 lines
                                                // of 5x7 characters
        LCD_SendCmd(LCD_OnOff);                 // Set Display Off
        LCD_SendCmd(LCD_OnOff|Disp_BIT);// Set display On
        Clear_LCD();
        }
void Clear_LCD(void)
        {
        LCDCursor = LCDLine = 0;        // Clear globals 
        LCD_SendCmd(LCD_Clear);         //Clear display
        LCD_Delay();                    // Delay of 4.6 mS
        LCD_SendCmd(LCD_Entry|INC_BIT); // Set cursor move to right
        LCD_Home();
        }
void LCD_Home(void)                        // Move cursor to the home position
        {
        LCD_MoveCurs(0);
        }
void LCD_MoveCurs2(unsigned char _pos)        // Move the display cursor
        {
        LCD_MoveCurs(_pos | LineNum_BIT);        // Send the command to the LCD
        }
void LCD_MoveCurs(unsigned char _pos)        // Move the display cursor
        {
        LCD_SendCmd(_pos | LCD_DDRAM);        // Send the command to the LCD
        }
//
// ** LCD_SendCmd        -- the routine sends a command to the LCD.
//
void LCD_SendCmd(unsigned char _ch)
        {
        LCD_CTRL &= ~LCD_RS;                // Set LCD to command mode
        LCD_Write(_ch);
        }
//
// ** LCD_SendChr        -- the routine sends a character to the LCD
//
void LCD_SendChr(unsigned char _ch)
        {
        LCD_CTRL |= LCD_RS;                // Set LCD to data mode
        LCD_Write(_ch);                        // Send the char
        }
//
// ** LCD_Write        -- the common routine to send command / data to the LCD
//                        It splits the character into the upper and lower
//                        nibbles and sends them to the LCD, upper nibble first
static void LCD_Write(unsigned char _ch)
        {
        LCD_WrNibl(_ch);        // Send the upper nibble to the LCD first
        LCD_WrNibl(_ch<<4);     // and then the lower one
        Delay100();             // Delay 100 uS
        }
static void _delay(void)
        {
        _NOP();
        _NOP();
        _NOP();
        _NOP();
        }
static void LCD_WrNibl(unsigned char _ch)        // The routine to write data nibble to the LCD
        {
        LCD_DATA = (_ch & DATA_MASK) | (LCD_DATA & ~DATA_MASK);         // Output the upper nibble
        _delay();
        LCD_CTRL        |= LCD_E;                        // Form LCD E pulse
        _delay();
        LCD_CTRL        &= ~LCD_E;                        //
        }
static void LCD_CmdWr(unsigned char _ch)
        {        ;
        LCD_WrNibl(_ch);        // Write the command nibble
        LCD_Delay();
        }
//
// ** LCD_Delay        -- the routine to do program delay of 4.6 mS approximately
//
static void LCD_Delay(void)
        {
        unsigned char        _count = 46;
        do
                {
                Delay100();
                }
        while (--_count);
        }