串口发送接收._c

ICCAVR_mega8_串口发送接收

//ICC-AVR application builder : 2009-3-11 14:28:07
// Target : M8
// Crystal: 8.0000Mhz

#include <iom8v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

/************************************
Name         :小延时程序
Target       :atmega8
Crystal(晶振):8M
************************************/
void delay()
{
 unsigned int i;//最大值65536
 for (i=0;i<40000;i++)
 {;}
}

/***********************************************************
用    途:串口发送接收程序
Taget   :mega8
crystal :8M
介    绍:
**********************************************************/
//晶振和波特率
#define fosc 8000000
#define baud 9600
//UART初始化函数
void init_uart()
{
 UCSRB=(1<<RXEN)|(1<<TXEN)|(1<<RXCIE);//允许收发,打开接收中断
 UBRRL=(fosc/16/(baud+1))%256;//设置波特率寄存器
 UBRRH=(fosc/16/(baud+1))/256;
 UCSRC=(1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0);//8位数据+1位STOP
}
//字符输出
void uart_putchar(unsigned char c)
{
 while(!(UCSRA&(1<<UDRE)));//上次发送有没有完成
 UDR=c;
}
//字符输入
unsigned char uart_getchar()
{
 while(!(UCSRA&(1<<RXC))){;}//有没有接收到数据
 return UDR;
}
//带回车的字符串输出
int uart_print(char *s)
{
 while(*s)
 {
  uart_putchar(*s);
  s++;
 }
 uart_putchar(0x0a);//回车换行
 uart_putchar(0x0d);
 return 1;
}
//不带回车换行的字符串输出
void uart_prints(char *s)
{
 while(*s)
 {
  uart_putchar(*s);
  s++;
 }
}
//接收中断
#pragma interrupt_handler uart_rec_int:iv_USART_RX
void uart_rec_int()
{
 unsigned char i;
 i=UDR;
 uart_putchar(i);
 uart_putchar(0x0a);//回车换行
 uart_putchar(0x0d);
}
//**************************************************************************

void main()
{
 port_init();
 init_devices();
 
 init_uart();
 uart_print("xiaozhiyong");
 while(1)
 {
  ;
  //delay();
 }
}