实现两个单片机系统串行通信的功能，一端的功能为发送数据，一端的功能为接收并显示数据；（提交电路图、程序文档、视频）

用proteus模拟，单片机型号：ATMega16

电路图：

 U1（接收端）代码：

//共阳极数码管，接收端代码，ATMega16
#include<iom16v.h>
const unsigned char num[] = { 0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90 };
unsigned int led[3];
unsigned char x = 0;
//io初始化
void io_init(void)
{
	DDRC = 0XFF;
	PORTC = 0X00;
	DDRD = 0XF0;
	PORTD = 0XF0;
}

//时钟初始化 T/C0
void t_init(void)
{
	TCCR0 = 0B00001100;//ctc,256分频
	OCR0 = 50;
}

//USART初始化
void usart_init(unsigned int baud)
{
 	UBRRH = (unsigned char)(baud>>8);
	UBRRL = (unsigned char)baud;
	UCSRB = 1<<RXEN;
	UCSRC = (1<<URSEL)|(3<<UCSZ0);
}

//数据接收函数
unsigned int usart_receive(void)
{
 	unsigned char dl,dh;
	unsigned int d;
	while(!(UCSRA & (1<<RXC))) ;
	dl = UDR;
	while(!(UCSRA & (1<<RXC))) ;
	dh = UDR;
	d = (unsigned int)dl + ((unsigned int)dh<<8);
	return d;
}

//中断刷新
#pragma interrupt_handler _led:20
void _led(void)
{
 	PORTD |= 0xF0;
 	x =(++x)%4;
	PORTC = num[led[x]];
	switch(x)
	{
		case 0: PORTD &= ~(1<<4); break;//个位
	 	case 1: PORTD &= ~(1<<5); break;//十位
		case 2: PORTD &= ~(1<<6); break;//百位
		case 3: PORTD &= ~(1<<7); break;//千位
		default: ; break; 
	}
}

//译码函数
void ledbuf(unsigned int input)
{

 	unsigned char i;
	for(i = 0; i <= 3; i++)
	{
 	 	led[i] = input % 10;
		input = input /10;
	}
}

void main(void)
{
 	io_init();
	t_init();
 	usart_init(103);
	TIMSK = 1<<1;
	SREG = 1<<7;    // T0比较匹配
 	while(1)
	{	
		ledbuf(usart_receive());
	}
}

U2（发送端代码）：

//发送数据代码
#include<iom16v.h>
#define DATA 9531
//传输数据DATA

//usart初始化
void usart_init(unsigned int baud)
{
	UBRRH = (unsigned char)(baud>>8);
	UBRRL = (unsigned char)baud;// 设置波特率
	UCSRB = 1<<TXEN;//发送器使能 
	UCSRC = (1<<URSEL)|(3<<UCSZ0);// 帧格式:8个数据位,1个停止位 
}

//数据发送函数
void usart_transmit(unsigned int data)
{
	while(!(UCSRA & (1<<UDRE))) ;
	UDR = (unsigned char)data;
	while(!(UCSRA & (1<<UDRE))) ;
	UDR = (unsigned char)( data>>8);
}

void main(void)
{
 	usart_init(103);
 	while(1)
	{
	 	usart_transmit(DATA);		
	}
}