我的LCD1602不显示，马老师请帮帮我！！！！！
无论如何1602就是不亮，下面是我的程序#include <avr\io.h>
#include <avr\delay.h>
#include <avr\interrupt.h>
//=======================================================================
#define LCD_EN_PORT PORTA //以下2个要设为同一个口
#define LCD_EN_DDR DDRA
#define LCD_RS_PORT PORTA //以下2个要设为同一个口
#define LCD_RS_DDR DDRA
#define LCD_DATA_PORTPORTA //以下3个要设为同一个口
#define LCD_DATA_DDR DDRA //一定要用高4位
#define LCD_DATA_PIN PINA
#define LCD_RS (1<<PA2) //0x04 portA2 out
#define LCD_EN (1<<PA3) //0x08 portA3 out
#define LCD_DATA ((1<<PA4)|(1<<PA5)|(1<<PA6)|(1<<PA7)) //0xf0 portA4/5/6/7 out
///////////////////////////////////////////////////////////////////
void LCD_init(void);
void LCD_en_write(void);
void LCD_write_command(unsignedchar command) ;
void LCD_write_data(unsigned char data);
void LCD_set_xy (unsigned char x, unsigned char y);
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s);
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data);
void delay_nus(unsigned int n);
void delay_nms(unsigned int n);
//-----------------------------------------------------//
void delay_1us(void) //1us延时函数
{
asm("nop");
}
void delay_nus(unsigned int n) //N us延时函数
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1us();
}
void delay_1ms(void) //1ms延时函数
{
unsigned int i;
for (i=0;i<1140;i++);
}
void delay_nms(unsigned int n) //N ms延时函数
{
unsigned int i=0;
for (i=0;i<n;i++)
delay_1ms();
}
void LCD_init(void) //液晶初始化
{
LCD_DATA_DDR|=LCD_DATA; //数据口方向为输出
LCD_EN_DDR|=LCD_EN; //设置EN方向为输出
LCD_RS_DDR|=LCD_RS; //设置RS方向为输出
LCD_write_command(0x28);
LCD_en_write();
delay_nus(40);
LCD_write_command(0x28);//4位显示
LCD_write_command(0x0c);//显示开
LCD_write_command(0x01);//清屏
delay_nms(2);
}
void LCD_en_write(void)//液晶使能
{
LCD_EN_PORT|=LCD_EN;
delay_nus(1);
LCD_EN_PORT&=~LCD_EN;
}
void LCD_write_command(unsigned char command) //写指令
{
delay_nus(16);
LCD_RS_PORT&=~LCD_RS; //RS=0
LCD_DATA_PORT&=0X0f; //清高四位
LCD_DATA_PORT|=command&0xf0; //写高四位
LCD_en_write();
command=command<<4; //低四位移到高四位
LCD_DATA_PORT&=0x0f; //清高四位
LCD_DATA_PORT|=command&0xf0; //写低四位
LCD_en_write();
}
void LCD_write_data(unsigned char data) //写数据
{
delay_nus(16);
LCD_RS_PORT|=LCD_RS; //RS=1
LCD_DATA_PORT&=0X0f; //清高四位
LCD_DATA_PORT|=data&0xf0;//写高四位
LCD_en_write();
data=data<<4; //低四位移到高四位
LCD_DATA_PORT&=0X0f; //清高四位
LCD_DATA_PORT|=data&0xf0; //写低四位
LCD_en_write();
}
void LCD_set_xy( unsigned char x, unsigned char y )//写地址函数
{
unsigned char address;
if (y == 0) address = 0x80 + x;
else address = 0xc0 + x;
LCD_write_command( address);
}
void LCD_write_string(unsigned char X,unsigned char Y,unsigned char *s) //列x=0~15,行y=0,1
{
LCD_set_xy( X, Y ); //写地址
while (*s)// 写显示字符
{
LCD_write_data( *s );
s ++;
}
}
void LCD_write_char(unsigned char X,unsigned char Y,unsigned char data) //列x=0~15,行y=0,1
{
LCD_set_xy( X, Y ); //写地址
LCD_write_data( data);
}
void init_devices(void)
{
cli(); //disable all interrupts
LCD_init();
MCUCR = 0x00;
GICR= 0x00;
TIMSK = 0x00; //timer interrupt sources
sei(); //re-enable interrupts
}
int main(void)
{
DDRA= 0xff;
init_devices();
LCD_write_string(1,0,"OK");
for(;;)
{
LCD_write_string(0,1,"HELLO");
LCD_write_char(13,0,'R');
}
return 0;
} 背光倒是亮是不显示字符 应该是初始化没成功。
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