usart.c

ATmega128芯片的测试程序

#include"usart.h"
void Init_USART1(void)										//UART 初始化 
{	
	UBRR1H=0;   
	UBRR1L=47;                                 	//波特率9600 											
    UCSR1B |= (1<<RXEN)|(1<<TXEN);                     //RXEN1,TXEN1使能，查询方式主动发送
	UCSR1C |=(3<<UCSZ10);			       //数据桢设为8位数据
}
//从串口输出一个字符 
void putch( unsigned char c)									
{ 
	while( !(UCSR1A & (1<<UDRE1)) ); 
	UDR1=c; 

} 
//从串口输出一个字符串
void putstr(unsigned char *str)
{
  while(*str!='\0')
  {
     putch(*str);
	 str++;
   }
   
}
void putnumb(unsigned int num,unsigned char number_bit)
{   
    unsigned char digi[5];
    unsigned char i;

    digi[0]=num/10000;
    digi[1]=num/1000%10;
    digi[2]=num/100%10;
    digi[3]=num/10%10;
    digi[4]=num%10;

    for(i=0;i<number_bit;i++) 
	   putch(digi[5-number_bit+i]+0x30);
}