请写出LCD显示单片机代码
时间: 2023-09-27 22:11:12 浏览: 48
以下是一个基于AVR单片机的LCD显示代码示例:
```
#include <avr/io.h>
#include <util/delay.h>
#define LCD_DATA_PORT PORTD
#define LCD_CTRL_PORT PORTB
#define LCD_RS PB0
#define LCD_RW PB1
#define LCD_EN PB2
void lcd_command(unsigned char cmd)
{
LCD_DATA_PORT = cmd;
LCD_CTRL_PORT &= ~(1<<LCD_RS);
LCD_CTRL_PORT &= ~(1<<LCD_RW);
LCD_CTRL_PORT |= (1<<LCD_EN);
_delay_us(1);
LCD_CTRL_PORT &= ~(1<<LCD_EN);
_delay_ms(2);
}
void lcd_data(unsigned char data)
{
LCD_DATA_PORT = data;
LCD_CTRL_PORT |= (1<<LCD_RS);
LCD_CTRL_PORT &= ~(1<<LCD_RW);
LCD_CTRL_PORT |= (1<<LCD_EN);
_delay_us(1);
LCD_CTRL_PORT &= ~(1<<LCD_EN);
_delay_ms(2);
}
void lcd_init()
{
LCD_DATA_PORT = 0xFF;
LCD_CTRL_PORT &= ~(1<<LCD_RS);
LCD_CTRL_PORT &= ~(1<<LCD_RW);
LCD_CTRL_PORT |= (1<<LCD_EN);
_delay_us(20);
LCD_CTRL_PORT &= ~(1<<LCD_EN);
_delay_ms(5);
lcd_command(0x38);
lcd_command(0x0C);
lcd_command(0x06);
lcd_command(0x01);
_delay_ms(2);
}
int main()
{
DDRD = 0xFF;
DDRB = (1<<LCD_RS) | (1<<LCD_RW) | (1<<LCD_EN);
lcd_init();
lcd_command(0x80); // Set cursor to beginning of first line
lcd_data('H');
lcd_data('e');
lcd_data('l');
lcd_data('l');
lcd_data('o');
lcd_data(',');
lcd_data(' ');
lcd_data('W');
lcd_data('o');
lcd_data('r');
lcd_data('l');
lcd_data('d');
while(1)
{
}
return 0;
}
```
这段代码的作用是初始化LCD并在第一行显示“Hello, World”。具体实现方式是使用AVR单片机的GPIO口控制LCD屏幕的RS、RW和EN引脚,向LCD屏幕发送命令和数据。注意到该代码中使用了_delay_us()和_delay_ms()函数进行延时,这是为了确保LCD屏幕能够正确地接收和处理信号。
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