lcd.c

关于LCD的背光灯的电路接法,使用三极管放大

#include <msp430x14x.h>
#include "lcd.h"

void ST7920_ChkBusy(void)
{
    delay_nms(10);
}

void ST7920_SendByte(unsigned char dat)
{
    unsigned char i, d;
    for(i=0;i<8;i++)
    {
        d=dat&0x80;
        if(d)
            SET_LCD_SID;        //SID=0
        else
            CLR_LCD_SID;        //SID=1
        dat<<=1;
        delay_nus(8);
        SET_LCD_CLK;            //CLK=1
        delay_nus(8);
        CLR_LCD_CLK;            //CLK=0
        delay_nus(8);
    }
}

void ST7920_SendCmd(unsigned char dat)
{
    unsigned char s;
    SET_LCD_CS;             //CS=1
    delay_nus(8);
    s=dat&0xf0;
    ST7920_SendByte(0xf8);
    ST7920_SendByte(s);
    s=dat&0x0f;
    s<<=4;
    ST7920_SendByte(s);
    delay_nus(8);
    CLR_LCD_CS;             //CS=0
    delay_nus(200);
}

void ST7920_SendData(unsigned char dat)
{
    unsigned char s;
    SET_LCD_CS;             //CS=1
    delay_nus(8);
    s=dat&0xf0;
    ST7920_SendByte(0xfa);
    ST7920_SendByte(s);
    s=dat&0x0f;
    s<<=4;
    ST7920_SendByte(s);
    delay_nus(8);
    CLR_LCD_CS;             //CS=0
}

void ST7920_Init(void)
{
    delay_nms(40);
    ST7920_SendCmd(0x30);
    delay_nms(5);
    ST7920_SendCmd(0x30);
    delay_nms(3);
    ST7920_SendCmd(0x0c);
    delay_nms(5);
    ST7920_SendCmd(0x01);
    delay_nms(10);
    ST7920_SendCmd(0x06);
    delay_nms(10);
}

void LCD_set_xy( unsigned char x, unsigned char y )
{
    unsigned char address;
    switch(y)
    {
        case 0:
            address = 0x80 + x;
            break;
        case 1:
            address = 0x90 + x;
            break;
    }
    ST7920_SendCmd(address );
}

void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s)
{
    LCD_set_xy( X, Y );
    while (*s) 
    {
        ST7920_SendData( *s );
        s ++;
        delay_nms(1);
    }
}