这个4线太难搞了，1602的PDF没对4线作详细介绍。哪位好心人帮忙看看
#include <reg51.h>
#define lcd_rs P1_1
#define lcd_rw P1_2
#define lcd_e P1_3
#define lcd_io P1
sbit P1_0=P1^0;
sbit P1_1=P1^1;
sbit P1_2=P1^2;
sbit P1_3=P1^3;
sbit P1_4=P1^4;
sbit P1_5=P1^5;
sbit P1_6=P1^6;
sbit P1_7=P1^7;
sbit P3_0=P3^0;
sbit P3_1=P3^1;
sbit P3_2=P3^2;
sbit P3_3=P3^3;
sbit P3_4=P3^4;
sbit P3_5=P3^5;
sbit P3_6=P3^6;
sbit P3_7=P3^7;
unsigned char code msg1[] = {"Hello"};
unsigned char code msg2[] = {"World"};
unsigned char code msg3[] = {" "};
void lcd_init(void);
void lcd_send(unsigned char dat);
void lcd_addr(unsigned char addr);
void lcd_string(unsigned char code *sdata,unsigned char lengh);
void Delay_5ms()
{
unsigned int i=1000;
while(--i);
}
void Delay_5us()
{
unsigned char i=5;
while(--i);
}
//========================================
void main(void)
{
unsigned char t;
lcd_init();
while(1)
{
lcd_addr(0x05);
lcd_string(msg1,5);
lcd_addr(0x45);
lcd_string(msg2,5);
for(t=200;t>0;t--) Delay_5ms();
lcd_addr(0x05);
lcd_string(msg3,5);
lcd_addr(0x45);
lcd_string(msg3,5);
for(t=200;t>0;t--) Delay_5ms();
}
}
void lcd_init(void)
{
lcd_rw = 0;
lcd_rs = 0;
Delay_5ms();
lcd_e = 1;
lcd_io &= 0x0f;
lcd_io |= 0x30;//
Delay_5us();
lcd_e = 0;
Delay_5ms();
lcd_e = 1;
lcd_io &= 0x0f;
lcd_io |= 0x30;//
Delay_5us();
lcd_e = 0;
Delay_5ms();
lcd_e = 1;
lcd_io &= 0x0f;
lcd_io |= 0x30;//
Delay_5us();
lcd_e = 0;
Delay_5ms();
lcd_send(0x28);//
lcd_send(0x0c);
lcd_rs = 0;
lcd_send(0x01);
lcd_send(0x0c);
lcd_send(0x06);
lcd_send(0x14);
lcd_rs = 1;
Delay_5ms();
}
void lcd_send(unsigned char dat)
{
lcd_e = 1;
lcd_io &= 0x0f;
lcd_io |= dat & 0xf0;
Delay_5us();
lcd_e = 0;
Delay_5us();
lcd_e = 1;
dat <<= 4;
lcd_io &= 0x0f;
lcd_io |= dat;
Delay_5us();
lcd_e = 0;
Delay_5us();
}
void lcd_addr(unsigned char addr)
{
lcd_rs = 0;
addr |= 0x80;
lcd_send(addr);
lcd_rs = 1;
}
void lcd_string(unsigned char code *sdata,unsigned char lengh)
{
unsigned char x;
for(x=0;x<lengh;x++)
{
lcd_send(sdata[x]);
}
}
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