英文:
How can I make my led turn on for 1 second then turn off for 1 second?
问题
我正在学习嵌入式系统，我有一个简单的任务，要点亮一个LED灯，但我还想要实现一个定时器，让LED点亮一秒，然后熄灭一秒（依此类推），但我不确定如何做到这一点。我正在使用IAR Embedded Workbench开发ATmega324PB微控制器。以下是我的代码：
#include "iom324pb.h"
#include <ioavr.h>
#include <intrinsics.h>
void set_output(int pin)
{
DDRC |= (1 << pin);
}
void set_pin(int pin)
{
PORTC |= (1 << pin);
}
void turn_off(int pin)
{
PORTC &= ~(1 << pin);
}
int main(void)
{
set_output(7);
while (1)
{
set_pin(7);
turn_off(7);
}
}
我已经在互联网上搜索过，但我找到的代码对我来说过于复杂。我还尝试使用__delay_cycles(1000);函数，但它没有任何效果。
英文:
I am learning embedded and I had the simple task of lighting up a led, but also i want to implement a timer that turns the led on for a second and then turns it off for another seconds(and so on), but i am not sure how to do it. I am working on a ATmega324PB microcontroller using the IAR Embedded Workbench. Here is my code:
include "iom324pb.h"
#include <ioavr.h>
#include <intrinsics.h>
void set_output(int pin)
{
DDRC |=(1<< pin);
}
void set_pin(int pin)
{
PORTC |=(1 << pin);
}
void turn_off(int pin)
{
PORTC &= ~(1 << pin);
}
int main(void)
{
set_output(7);
while (1)
{
set_pin(7);
turn_off(7);
}
}
I have searched on the internet but the codes I've found were far too complex for my understanding.I've also tried using the __delay_cycles(1000); function but it doesn't do anything.
答案1
得分: 2
ATmega324PB内置了一个8MHz的RC振荡器，但是代码中没有明确的MCU外设的初始过程。因此，假设ATmega324PB默认以8MHz主时钟运行，那么__delay_cycles(1000);将等待大约125微秒甚至更多。相反，__delay_cycles(8000000);或者一个有限的循环，例如for(i=2000000;i>0;i--);，可能会起作用。
建议：尝试使用内部定时器来实现延迟功能。应用笔记AVR130：使用tinyAVR和megaAVR设备上的定时器可能是一个可行的参考。
英文:
ATmega324PB has an internal 8MHz RC oscillator, while the code has no explicit initial process for the peripheral of MCU. Then, assuming ATmega324PB runs with a main clock of 8MHz by default, so a __delay_cycles(1000); would wait for about 125uS and some more. Instead, __delay_cycles(8000000); or a finite-loop, e.g. for(i=2000000;i>0;i--);, might work.
Suggestion: Try to use its internal Timer to implement the functionality of delay. The application note AVR130: Using the timers on tinyAVR and megaAVR devices would be a viable reference.
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