本例液晶屏基于HD44780近制芯片，它连接单片机串口，显示单片机串口所发送的字符信息。
程序执行时串行液晶上显示：Serial LCD DEMO 当光标在第二行闪烁时，虚拟终端中输入的字符显示
在LCD上，按下退格键进光标左移，按回车键时清屏
Proteus截图：
Atmel Studio6.2运行时截图：
程序清单：
- /*
- * GccApplication28.c
- *
- * Created: 2014-12-5 20:39:58
- * Author: Administrator
- */
- #define F_CPU 4000000UL
- #include <avr/io.h>
- #include <avr/interrupt.h>
- #include <util/delay.h>
- #include <stdint.h>
- void Init_USART()
- {
- UCSRB = _BV(RXEN)| _BV(TXEN)|_BV(RXCIE);//允许接收和发送，接收中断使能
- UCSRC = _BV(URSEL)| _BV(UCSZ1)| _BV(UCSZ0);
- UBRRL = (F_CPU/9600/16 - 1) % 256;
- UBRRH = (F_CPU/9600/16 - 1) /256;
- }
- void PutChar(char c)
- {
- if( c == '\n') PutChar('\r');
- UDR = c;
- while(!(UCSRA & _BV(UDRE)));
- }
- void PutStr(char *s)
- {
- uint8_t i = 0;
- while(s[i] !='\0')
- {
- PutChar(s[i++]);
- _delay_ms(5);
- }
- }
- void Write_LCD_COMMAND(uint8_t comm)
- {
- PutChar(0xFE);
- PutChar(comm);
-
- }
- int main(void)
- {
- Init_USART();
- sei();
- _delay_ms(300);
- PutStr(" Serial LCD DEMO ");
- Write_LCD_COMMAND(0xC0);
- Write_LCD_COMMAND(0x0d);
- while(1);
- }
- ISR(USART_RXC_vect)
- {
- uint8_t c = UDR;
- if(c == 0x0D)
- {
- Write_LCD_COMMAND(0x01);
- return;
- }
- if(c == 0x08)
- {
- Write_LCD_COMMAND(0x10);
- return;
- }
- PutChar(c);
- }
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