?? display.c
字號:
#include <reg52.h>
#define comm 0
#define dat 1
sbit RS = P3^3; //H=data; L=command;
sbit RW = P3^4; //H=read; L=write;
sbit E = P3^5; //input enable;
sbit busy=P1^7; //lcd busy bit
void chk_busy (void)
{
P1=0xff;
RS=0;
RW=1;
E =1;
while(busy==1);
E =0;
}
/*---------------------------------------*/
void write_lcd (unsigned char dat_comm,unsigned char content)
{
chk_busy ();
if(dat_comm)
{
RS=1; RW=0; //write data
}
else
{
RS=0; RW=0; //write command
}
P1=content; //output data or comm
E=1;
E=0;
}
void clrram (void)
{
write_lcd (comm,0x30);
write_lcd (comm,0x01);
}
void init_lcd (void)
{
write_lcd (comm,0x30); /*30---基本指令動作*/
write_lcd (comm,0x01); /*清屏,地址指針指向00H*/
write_lcd (comm,0x06); /*光標的移動方向*/
write_lcd (comm,0x0c); /*開顯示,關游標*/
}
void line_disp (unsigned char lines , unsigned char *chn)
{
unsigned char i;
write_lcd (comm,0x30);
switch (lines)
{
case 0: write_lcd (comm,0x80);for (i=0;i<16;i++)write_lcd (dat,chn[i]);break;
case 1: write_lcd (comm,0x90);for (i=0;i<16;i++)write_lcd (dat,chn[i]);break;
case 2: write_lcd (comm,0x88);for (i=0;i<16;i++)write_lcd (dat,chn[i]);break;
case 3: write_lcd (comm,0x98);for (i=0;i<16;i++)write_lcd (dat,chn[i]);break;
}
}
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