为啥pb3没有输出，设计是1k输出

只看该作者 · 2012-9-29 11:40

#include <iom32v.h>
#include <macros.h>
void port_init(void)
{
PORTA = 0x00;
DDRA  = 0x00;
PORTB = 0x08;
DDRB  = 0x08;
PORTC = 0x00;
DDRC  = 0x00;
PORTD = 0x00;
DDRD  = 0x00;
}
//TIMER0 initialize - prescale:64
// WGM: Normal
// desired value: 1KHz
// actual value:  1.002KHz (0.2%)
void timer0_init(void)
{
TCCR0 = 0x00; //stop
TCNT0 = 0x8D; //set count
OCR0  = 0x73;  //set compare
TCCR0 = 0x23; //start timer
}
#pragma interrupt_handler timer0_comp_isr:10
timer0_comp_isr()
{
}

#pragma interrupt_handler timer0_ovf_isr:12
timer0_ovf_isr()
{
TCNT0 = 0x8D;
}
//call this routine to initialize all peripherals
main()
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
port_init();
timer0_init();
MCUCR = 0x00;
GICR  = 0x00;
TIMSK = 0x03; //timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}