16×2点阵字符型LCD模块KeilC51驱动程序

16×2点阵字符型LCD模块KeilC51驱动程序

＃i nclude <reg52.h>
#define uchar unsigned char
idata char flag0 ;
idata char flag1 ;
idata char flag2 ;
idata char flag3 ;
idata char flag4 ;
idata char flag5 ;
idata char flag6 ;
idata char flag7 ;
sbit RS=P2^3;
sbit RW=P2^4;
sbit LCDE=P2^5;
sbit big=P3^2;
sbit fd=P3^3;
unsigned char line1[16] line2[16];
unsigned char code cgram1[64]={0x00 0 0 0 0 0 0 0
0x1e 0 0 0 0 0 0 0
0x02 0 0 0 0 0 0 0
0x00 0 0 0 0 0 0 0
0x00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0x00 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0}

delay5ms()
{
register int i;
for (i=0;i<1000;i++)
;
}

void delay50us()
{
register int i;
for (i=0;i<20;i++)
;
}

wr_com(unsigned char comm)
{
LCDE=0;
RS=0;
RW=0;
LCDE=1;
P0=comm;
RS=0;
RW=0;
LCDE=0;
}

wr_data(unsigned char dat)
{
LCDE=0;
RS=0;
RW=0;
RS=1;
RW=0;
LCDE=1;
P0=dat;
LCDE=0;
RS=0;
RW=0;
}

unsigned char rd_bf()
{
unsigned char i;
P0=0xff;
LCDE=0;
RS=0;
RW=0;
RS=0;
RW=1;
LCDE=1;
i=P0;
LCDE=0;
return(i);
}
void init()
{
unsigned char in i;
wr_com(0x30);
delay5ms();
wr_com(0x30);
delay5ms();
wr_com(0x30);
delay5ms();
in=rd_bf();
delay5ms();
wr_com(0x01);
delay5ms();
in=rd_bf();
delay5ms();
wr_com(0x06);
delay5ms();
in=rd_bf();
delay50us();
wr_com(0x38);
delay50us();
in=rd_bf();
delay50us();
wr_com(0x0c);
delay50us();
in=rd_bf();
delay50us();
wr_com(0x40); //set cgram address
delay50us();
in=rd_bf();
delay50us();
for(i=0;i<64;i++)
{
wr_data(cgram1[i]); //display "0"
delay50us();
in=rd_bf();
}

}

display_162()
{
unsigned char in i;
wr_com(0x80); //set ram address
delay50us();
in=rd_bf();
delay50us();
for(i=0;i<16;i++)
{
wr_data(line1[i]); //display "0"
delay50us();
in=rd_bf();
}
in=rd_bf();
delay50us();
wr_com(0xc0);
delay50us();
in=rd_bf();
delay50us();
for(i=0;i<16;i++)
{
wr_data(line2[i]); //display "0"
delay50us();
in=rd_bf();
}
}
main()
{
unsigned char in i da;
delay5ms();
delay5ms();
delay5ms();
delay5ms();
init();

while(1)
{
if(fd==1)
{
line1[0]=0x20;
line1[1]=0; //display "爱思"
line1[2]=1;
line1[3]=4;
line1[4]=5;
line1[5]=0x20;
line1[6]=0; //display "爱思"
line1[7]=1;
line1[8]=4;
line1[9]=5;
line1[10]=0x20;
line1[11]=0; //display "爱思"
line1[12]=1;
line1[13]=4;
line1[14]=5;
line1[15]=0x20;
line2[0]=0x20;
line2[1]=2; //display "爱思"
line2[2]=3;
line2[3]=6;
line2[4]=7;
line2[5]=0x20;
line2[6]=2; //display "爱思"
line2[7]=3;
line2[8]=6;
line2[9]=7;
line2[10]=0x20;
line2[11]=2; //display "爱思"
line2[12]=3;
line2[13]=6;
line2[14]=7;
line2[15]=0x20;
}
else if(big==1)
{
da=0x41;
for(i=0;i<16;i++)
{
line1[i]=da;
da++;
}
da=0x51;
for(i=0;i<16;i++)
{
line2[i]=da;
da++;
}
}
else
{
da=0x61;
for(i=0;i<16;i++)
{
line1[i]=da;
da++;
}
da=0x71;
for(i=0;i<16;i++)
{
line2[i]=da;
da++;
}
}
display_162();
}
}