ac13-1.c

来自「AVR学习资料」· C语言 代码 · 共 55 行

#include <iom16v.h>
#include <macros.h>
//==================================
void port_init(void)
{
 PORTA = 0xFF; 
 DDRA  = 0x00; 
 PORTB = 0xFF; 
 DDRB  = 0xFF; 
 PORTC = 0xFF; 
 DDRC  = 0x00; 
 PORTD = 0xFF; 
 DDRD  = 0x02; 
}
//**********************************************
void uart0_init(void)
{
 UCSRB = 0x00; 
 UCSRA = 0x02;
 UCSRC = 0x06;
 UBRRL = 0x67;
 UBRRH = 0x00; 
 UCSRB = 0x18;
}
//**********************************************
void init_devices(void) 
{
 port_init();
 uart0_init();
 }
//**********************************************
void uart0_send(unsigned char i)
{
while(!(UCSRA&(1<<UDRE)));
UDR=i;
}
//************************************************
unsigned char uart0_receive(void) 
{
while(!(UCSRA&(1<<RXC)));
return UDR;
}
//---------------------------------------------------------------
void main(void)
{
unsigned char temp;
init_devices();
 while(1) 
 {
 temp=uart0_receive();
 PORTB=~temp; 
 uart0_send(temp);
 }
}