c - 如何在 atmega328p 中启用 timer0 中断？

Question

我正在尝试使用 timer0 中断用 atmega328p 制作闪烁的 LED。

这是一个非常基本的东西，但 Microchip Studio 给了我这个：

========== Build: 0 succeeded or up-to-date, 1 failed, 0 skipped=======

如何解决这个问题？代码附在下面：

#include<avr/io.h>
#include<avr/interrupt.h>
#include<util/delay.h>
    
#define F_CPU 1000000UL
    
int main(void)
{
  //define inputs and outputs
  DDRC = (1<<DDC4); // portc4 as output
  TCNT0 = 0x00;
  TCCR0A = 0x00;
  TCCR0B = (1<<CS00) | (1<<CS01);
  TIMSK0 = (1<<TOIE0);
  sei(); // set global interrupts
  while (1) 
  {
    PORTC4 |= (1<<PORTC4);
  }
}
    
ISR(TIMER0_OVF_vect) {
  TCNT0 = 0x00;
  PORTC &= ~(1<<PORTC4);    
}

Answer 1

纠正了一些事情，也许这会有所帮助：

#define F_CPU 1000000UL

#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>


ISR(TIMER0_OVF_vect) {
    // TCNT0 = 0x00;  // Not necessary, it is done by hardware
    PORTC = ~(1<<PINC4);
}

int main(void)
{
    //define inputs and outputs
    DDRC = (1<<PINC4);
    
    // TCNT0 = 0x00;    // Autoset to zero after initialisation
    // TCCR0A = 0x00;   // Autoset at startup
    
    // Timer 0
    // Mode: Overflow, Interrupt
    // Prescaler: /64
    TCCR0B = (1<<CS01) | (1<<CS00);
    TIMSK0 = (1<<TOIE0);
    
    sei(); // set global interrupts
    
    while (1)
    {
        // PORTC |= (1<<PINC4); // is done in interrupt
    }
}

Build succeeded.

========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========