16 bit PC PWM

16 bit PC PWM

 

================================ Outline ====================================

16bit PC PWM

- LED를 활용한 dimming

----------------------------------------------------------------------------

Duty rate를 변경하여 LED를 제어해보자.

GPIO를 버튼 2개에 활용하여 up과 down을 설정하고 LED의 불 밝기를 조절해 보자.

 

 

/*** 소스 ***/

 

<main.c>

#include "SMART.h" int main(void) {   /*** 변수 선언 ***/   int duty=0;   char i=0;      /*** 포트 설정 ***/   DDRB = 0xFF;  //PORT B의 모든 핀 출력 설정   DDRA = 0xFC;  //PORT A의 모든 핀 입력 설정         /*** PC PWM  설정 ***/   TCCR1A = 0x81;  //Phase Correct PWM 0b 1000 0001   TCCR1B = 0x02;  // 0b 0001 0001, 1분주      while(1)   {     while(PINA==0x01)     {       if(PINA==0x00)       {           duty +=51;           ++i;                              if(i>5)           {                         OCR1A=duty=255;             i = 6;           }           OCR1A = duty;                      }     }                              while(PINA==0x02)     {       if(PINA==0x00)       {                      duty -=51;             --i;                              if(duty<=50)           {                          i=duty=0;                        }           OCR1A = duty;                  }                    }                }      return 0; }