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AVR microcontroller microsecond and millisecond delay function

Publisher:delta14Latest update time:2015-10-19 Source: eefocus Reading articles on mobile phones Scan QR code
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I always encounter problems when using the microcontroller IO port to simulate the bus timing. I have summarized that most of them are caused by inaccurate delay, so I adjusted two delay functions. My board uses an AT Mega128 microcontroller and a 16MHz crystal oscillator. I used an oscilloscope to see that the waveforms generated by these two functions are quite accurate. I hope you can use them^_^

 

//16MHz crystal oscillator    time range: 1-65535us

void Delay_us(unsigned int us)
{
   unsigned int i;
  i = us/2;
  i--;
  asm("nop"); asm("nop");
    for(;i!=0;i--)      
    {
          asm("nop");     asm("nop");     asm("nop");
          asm("nop");     asm("nop");     asm("nop");
          asm("nop");     asm("nop");     asm("nop");
    }
   
}

//16MHz crystal oscillator    time range: 1-65535ms 

void Delay_Ms(unsigned int t)
{  
    for(;t>0;t--)      
          Delay_us(1100);
}

Reference address：AVR microcontroller microsecond and millisecond delay function

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He Limin Column Microcontroller and Embedded Systems Bible

Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.

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