int main(void) {
char buf[36];
uint8_t ee_timer = 0;
PORTB = (1<<PB7)|(1<<PB4);
DDRB = (1<<PB7)|(1<<PB4);
PORTD = 0;
DDRD = 0;
UBRRH=0;
UBRRL = 12; // 9,6 kBaud
UCSRA = (1<<U2X);
UCSRB = (1<<TXEN);
UCSRC = (3<<UCSZ0); // 8 bit, 1 stopbit
TCCR0A = (1<<WGM01)|(1<<WGM00);
TCCR0B = (1<<WGM02)|(7<<CS00);
OCR0A = 49;
TCCR1A = 0;
TCCR1B = (5<<CS10);
TCCR1C = 0;
TIMSK = (1<<TOIE1) | (1<<TOIE0);
MCUCR = (1<<ISC01);
GIMSK = (1<<INT0);
set_sleep_mode(SLEEP_MODE_IDLE);
buf[0]='*';
buf[1+8] = buf[1+8+1+8] = buf[1+8+1+8+1+8] = ',';
buf[1+8+1+8+1+8+2] = ',';
buf[30]='#';
buf[31]='\r';
buf[32]='\n';
buf[33]=0;
load_eeprom();
while(1) {
cli();
if(events & EVT_TIMER) {
uint32_t cnt_copy = cnt;
uint32_t mark_copy = mark_cnt;
uint8_t evts_copy = events;
uint32_t echo;
events = 0;
sei();
PORTB &= ~(1<<PB7); // LED on
echo = ping();
u32tostr((uint8_t*)buf+1, cnt_copy);
u32tostr((uint8_t*)buf+1+8+1, mark_copy);
u32tostr((uint8_t*)buf+1+8+1+8+1, echo);
// error indicator - inverted input
buf[28] = (PINB & (1<<PB0)) ? '0' : '1';
if(buf[28]&1) {
PORTB &= ~(1<<PB4); // ERROR-LED on
}
else {
PORTB |= (1<<PB4); // ERROR-LED off
}
buf[30]=0;
cksum((uint8_t *)buf);
uart_send(buf);
/* eeprom write pending? */
if(ee_timer) {
ee_timer--;
if(!ee_timer)
write_eeprom(cnt_copy);
}
else if(evts_copy & EVT_CNTR)
ee_timer = EE_WRDIV; // counter changed -> schedule eeprom write
PORTB |= (1<<PB7); // LED off
}
else
sei();
sleep_mode();
}
return 0;
}
/*****************************************************************************
** 函数名称: USART_Put_Num
** 功能描述: 串口发送数值
函数中会将数值转为相应的字符串，发送出去。比如 4567 转为 "4567"
** 作 者: Dream
** 日 期: 2010年12月17日
*****************************************************************************/
void USART_Put_Num(u32 dat)
{
char temp[20];
u32tostr(dat,temp);
USART_Send_Str(temp);
}