主函数main.c
#include <msp430g2553.h>
#include"LCD12864P.h"

void main()
{
        WDTCTL = WDTPW + WDTHOLD;
        Ini_Lcd();
           lcd_pos(1,0);
           Disp_HZ("液晶12864",5);
           lcd_pos(3,4);
           Disp_HZ("欢迎使用",4);
           lcd_pos(2,3);
           Disp_SZ(0);
           Disp_SZ(3);
    while(1);
}

LCD12864P.c
#include<msp430g2553.h>
#define BIT(x)        (1 << (x))
#define uint unsigned int
#define uchar unsigned char
uchar LCD_table[]={0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};//0123456789

void Send(uchar type,uchar transdata);

#define cyCS      0    //P1.0，片选信号
#define cySID     1    //P1.1，串行数据
#define cyCLK     2    //P1.2，同步时钟
#define cyPORT    P1OUT
#define cyDDR     P1DIR

void delay_1ms()
{
        uint i;
        for(i=0;i<1140;i++);
}

void delay_nms(uint n)
{
    uint i = 0;
    for(i = n;i > 0;i--)
        delay_1ms();
}

void Ini_Lcd(void)
{
        cyDDR |= BIT(cyCLK) + BIT(cySID) + BIT(cyCS);   //相应的位端口设置为输出
        delay_nms(600);                 //延时等待液晶完成复位
        Send(0,0x30);  /*功能设置:一次送8位数据,基本指令集*/
        delay_nms(10);
        Send(0,0x02);  /*DDRAM地址归位*/
        delay_nms(5);
        Send(0,0x0c);  /*显示设定:开显示,不显示光标,不做当前显示位反白闪动*/
        delay_nms(5);
        Send(0,0x01);  /*清屏，将DDRAM的位址计数器调整为“00H”*/
        delay_nms(500);
        Send(0,0x06);  /*功能设置，点设定:显示字符/光标从左到右移位,DDRAM地址加1*/
        delay_nms(10);
}

void Send(uchar type,uchar transdata)//0-写控制命令，1-写数据
{
        uchar firstbyte = 0xf8;
        uchar temp;
        uchar i,j = 3;

        if(type) firstbyte |= 0x02;

        cyPORT |= BIT(cyCS);
        cyPORT &= ~BIT(cyCLK);
        while(j > 0)
        {
                if(j == 3) temp = firstbyte;
                else if(j == 2) temp = transdata&0xf0;
                else  temp = (transdata << 4) & 0xf0;

                for(i = 8;i > 0;i--)
                {
                        if(temp & 0x80)        cyPORT |= BIT(cySID);
                        else                        cyPORT &= ~BIT(cySID);
                        cyPORT |= BIT(cyCLK);
                        temp <<= 1;
                        cyPORT &= ~BIT(cyCLK);
                }
                //三个字节之间一定要有足够的延时，否则易出现时序问题
                if(j == 3)        delay_nms(1);
                else               delay_nms(1);

                j--;
        }

        cyPORT &= ~BIT(cySID);
        cyPORT &= ~BIT(cyCS);
}

void lcd_pos(uchar x,uchar y)//定位
{
         uchar pos;
          switch(x)
          {
            case 1:pos=0x80;break;
            case 2:pos=0x90;break;
            case 3:pos=0x88;break;
            case 4:pos=0x98;break;
            default:pos=0x80;
          }
          pos += y;
          Send(0,pos);
}

void Disp_HZ(const uchar * pt,uchar num)//显示汉字
{
    uchar i;
           for(i = 0;i < (num*2);i++)
           Send(1,*(pt++));
}

void Disp_SZ(uchar shuzi)//显示一个数字
{
    Send(1,LCD_table[shuzi]);
}

LCD12864P.h
#ifndef LCD12864_H_
#define LCD12864_H_
#define uint unsigned int
#define uchar unsigned char
extern uchar LCD_table[];//0123456789
extern void delay_1ms();
extern void delay_nms(uint n);
extern void Ini_Lcd(void);
extern void Send(uchar type,uchar transdata);//0-写控制命令，1-写数据
extern void lcd_pos(uchar x,uchar y);//定位
extern void Disp_HZ(const uchar * pt,uchar num);//显示汉字
extern void Disp_SZ(uchar shuzi);//显示一个数字
#endif /* LCD12864_H_ */