MSP430单片机串行四线驱动1602液晶程序

#define uchar unsigned char
#define uint unsigned int
#define RS_1 P1OUT|=BIT3;//输入数据
#define RS_0 P1OUT&=~BIT3;//输入指令
#define RW_1 P1OUT|=BIT4;//写入指令或者数据
#define RW_0 P1OUT&=~BIT4;//从lcd里面读取数据
#define EN_1 P1OUT|=BIT5;//读取信息
#define EN_0 P1OUT&=~BIT5;//下降沿时候执行指令
#define datt P2OUT;
uchar temp=0;
uchar  table1[]={"hello"};
uchar  table2[]={"hello"};

/*.................................................
 * 延时程序
.................................................. */

void delay(uint i)
{
uint j;
while(--i!=0)
{
for(j=0;j<255;j++);
}
}

/*.................................................
 * 忙信号检查
.................................................. */

uchar chkbusy()
{
uchar busy;
P2OUT=0xf0;
EN_0;//读取数据
RS_0;//输入指令
RW_1;//写入指令或者数据
EN_1;//读取信息
busy=P2OUT&0x80;
delay(1);
EN_0;//下降沿执行指令
return(busy);
}

/*.................................................
 * 写指令
.................................................. */

void writecom(uchar x,uchar comm)
{
//if(x) while(chkbusy());
EN_0;
RS_0;
RW_0;
EN_1;
P2OUT=(comm&0xf0);
delay(5);
EN_0;
delay(5);
EN_1;
P2OUT=(comm&0x0f)<<4;
delay(5);
EN_0;
}

/*.................................................
 * 写数据
.................................................. */

void writedata(uchar dat)
{

//while(chkbusy()); //检查忙信号
EN_0;
RS_1;
RW_0;
EN_1;
P2OUT=(dat&0xf0); //送高四位数据到P2口
delay(5);
EN_0;
delay(5);
EN_1;
P2OUT=(dat&0x0f)<<4; //送低四位数据到P2口
delay(5);
EN_0;
P2OUT=P2OUT|0x0f; //置低四位为1

}

/*.................................................
 * lcd初始化程序
.................................................. */

void lcdinit()
{
delay(30);
writecom(0,0x02);//数据指针清零
delay(5);
writecom(1,0x28);//
writecom(1,0x0c);//显示光标开及设置
writecom(1,0x06);//显示光标移动设置
writecom(1,0x01);//显示清屏
delay(10);
}

/*.................................................
 * 在指定位置显示一个字符，x为行，Y为列
.................................................. */

void displayone(uchar x,uchar y,uchar *n)
{
uchar add;
if (x == 1) add=0x80+y;
//writecom(1,add);
else add=0xc0+y;
writecom(1,add);
writedata(*n);
}

/*.................................................
 * 显示字符串
.................................................. */

void displayleng(uchar x,uchar y,uchar *s)
{
y=y&0x0f;
while(*s)
{
displayone(x,y,s);
y++;
s++;
}
}

/*.................................................
 * 主函数
.................................................. */

void main()
{

 WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
    P2SEL=0x00;
    P2DIR = 0xff;
    P1DIR = 0x38;

lcdinit();
//lcdcls();

P2OUT=0xff;

writecom(1,0x01);
//writedata(0x01);
while(1)
{
displayleng(1,0,table1);
delay(100);
displayleng(2,1,table2);
}
}