uart_test._c

avr单片机的串口程序

#include <iom48v.h>

void delay(void)
{
  unsigned long i;
  for(i=0;i<11142;i++);
}

void uart0_init(void)
{

 UCSR0B = 0x00; //disable while setting baud rate
 UCSR0A = 0x00;
 UCSR0C = 0x0E;
 UBRR0L = 0x6; //set baud rate lo
 UBRR0H = 0x00; //set baud rate hi
 UCSR0B = 0x08;
//  UBRR0 =0x33;
//  UCSR0B=0x08;
//  UCSR0C=0x0e;
//  UBRR0L=0x6;
}

void sendchar(unsigned char c)
{
  // while(!(UCSR0A&0x40));
      UDR0=c;
	  while(!(UCSR0A&0x40));
}

main()
{
 int i;
 uart0_init();
 while(1)
 {
   delay();
  
   sendchar('0'+i);
   i=i+1;
   if(i>=9)
   i=0;
 } 
}