usart.rar_AVR 串口_AVR 串口通信_USART_avr gcc_avr usart

#include<avr/io.h> #include<avr/interrupt.h> void usart_init(void) { //设置波特率 UBRRL=51; //9600bps,8M UCSRB= _BV(RXEN) | _BV(TXEN) | _BV(RXCIE); //发送使能 UCSRC= _BV(URSEL) | _BV(UCSZ1) | _BV(UCSZ0);//8位数据 sei();//开中断 } main() { unsigned char i; unsigned int j; usart_init(); while(1) { //UDR=i; //while(!(UCSRA & _BV(TXC)));//等待发送完 //UCSRA |= _BV(TXC); for(j=0;j<10000;j++); i++; } } SIGNAL(SIG_USART_RECV) //串口接收中断 { unsigned char tmp=0x34; unsigned char i; unsigned char tbl[10]; //while(UCSRA & _BV(RXC)); //UCSRA |= _BV(RXC); tbl[0]=UDR; for(i=1;i<10;i++) { while(!(UCSRA & _BV(RXC)));//接收完毕 tbl[i]=UDR; } for(i=0;i<10;i++) { UDR=tbl[i]; while(!(UCSRA & _BV(TXC)));//等待发送完 UCSRA |= _BV(TXC); } }