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EEPW首頁(yè) > 嵌入式系統(tǒng) > 設(shè)計(jì)應(yīng)用 > AVR和51單片機(jī)串口通信簡(jiǎn)單實(shí)驗(yàn)

AVR和51單片機(jī)串口通信簡(jiǎn)單實(shí)驗(yàn)

作者：時(shí)間：2016-11-30 來(lái)源：網(wǎng)絡(luò)

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//AVR作為發(fā)送機(jī)，控制51的喇叭發(fā)聲和2極管發(fā)光

//AVR發(fā)送方代碼 //采用2400波特率

#include
#include

#define uchar unsigned char
#define uint unsigned int

#define k1 PIND_Bit4 //設(shè)置為喇叭
#define k3 PIND_Bit6 //設(shè)置為發(fā)光管
#define k4 PIND_Bit7 //發(fā)送控制命令

#define UDRE 5
#define RXC 7

uchar dat=48;

void delay(uint k)
{
uint i,j;
for(i=0;ifor(j=0;j<1140;j++);
}

#include "1602.h"

void port_init()
{
PORTA=0xff;
DDRA=0xff;
PORTB=0xff;
DDRB=0xff;
PORTC=0xff;
DDRC=0xff;
PORTD=0xff;
DDRD=0x0f;
}

void serial_init()
{
UCSRB=0x00;
UCSRA=0x02; //雙倍速
UCSRC=0x06; //8位字符模式
UBRRH=0x01; //2400波特率
UBRRL=0xa0;
UCSRB=0x18;
}

void send(uchar k) //串口發(fā)送函數(shù)
{
while(!(UCSRA&(1<UDR=k;

}

void key1()
{
static uint i,j;
if(k1==0)
{
if(i==0)
{
j++;
if(j>10)
{
if(k1==0)
{
i=1;j=0;
dat=49;
}
}
}
}
else
{
i=0;j=0;
}
}

void key3()
{
static uint i,j;
if(k3==0)
{
if(i==0)
{
j++;
if(j>10)
{
if(k3==0)
{
i=1;j=0;
dat=50;
}
}
}
}
else
{
i=0;j=0;
}
}

void main()
{
port_init();
serial_init();
init1602();
delay(1000);
while(1)
{
displayonechar(1,6,dat);
if(k4==0)
{
send(dat);
}
key1(); //喇叭發(fā)聲

key3(); //2極管發(fā)光
}
}

//----------1602庫(kù)函數(shù)-----------

#define RS PORTB_Bit0
#define RW PORTB_Bit1
#define EN PORTB_Bit2
#define DATA PORTA
#define busy 0x80

void wait()
{
uchar val;
DATA=0xff;
RS=0;
RW=1;
__no_operation();
__no_operation();
EN=1;
__no_operation();
__no_operation();
DDRA=0x00;
val=PINA;
while(val&busy)
{
val=PINA;
}
EN=0;
DDRA=0xff;
}

void writecmd(uchar cmd)
{
wait();
RS=0;
RW=0;
__no_operation();
DATA=cmd;
__no_operation();
EN=1;
__no_operation();
__no_operation();
EN=0;
}

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關(guān)鍵詞： AVR51單片機(jī)串口通

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AVR和51單片機(jī)串口通信簡(jiǎn)單實(shí)驗(yàn)

嵌入式系統(tǒng) AVR51單片機(jī)串口通 | 2016-11-30

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