#include
#include
int k=0,i=0,j=0;
char s[4];
/*
*The function of the program is to send back the data sent from the computer
*/
void usart0_init()
{
UCSR0A=0X00;
UCSR0B = 0x00;
UCSR0C=0X00;
UCSR0C=(1<
UBRR0H=0;
UCSR0B=(1<
DDRE=0X02; //MCU ports RX0 and TX0 must be functional, the PE buckle corresponding to RX0 must be set to input mode, and the pull-up must be enabled, and TX0 must be set to output mode
}
int main(void)
{
DDRA=0XFF;
PORTA=0XFF;
DDRB=0XFF;
PORTB=0X00;
usart0_init();
sei();
while(1)
{
PORTA=(s[0]<<8)+s[0];
}
}
/*
*Receive end interrupt
*/
ISR(USART0_RX_vect)
{
cli();
if(i<2)
{
s[i]=UDR0;//Accept 4 characters each time
i++;
}
else
{
i=0;
while(!(UCSR0A&(1<
UDR0=s[0];
}
}
/*
*Send end interrupt
*/
ISR(USART0_TX_vect)
{
cli();
j++;
while(!(UCSR0A&(1<
else j=0;
sei();
}
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