#include <project.h>
void PWM2_Init()
{
*AT91C_PMC_PCER = 1<<(AT91C_ID_PWMC); //clock into PWM
*AT91C_PIOA_PPUDR = (AT91C_PA25_PWM2);//pull-up register disable
*AT91C_PIOA_PDR = (AT91C_PA25_PWM2); //PIOA pin disable
*AT91C_PIOA_BSR = (AT91C_PA25_PWM2); //Prepheral B 25(PWM2) enable
*AT91C_PWMC_MR = (30 << DIVA) |(0x03<< PREA)
| (30 << DIVB) |(0x03<< PREB); //200,000hz
*AT91C_PWMC_CH2_CMR = AT91C_PWMC_CPRE_MCKA & (~AT91C_PWMC_CALG)
& (~AT91C_PWMC_CPOL) & (~AT91C_PWMC_CPD); //channel mode register
*AT91C_PWMC_CH2_CPRDR = MAXDUTY; //Channel Period Register
*AT91C_PWMC_CH2_CDTYR = DEF_DUTY; //Channel Duty Cycle Register
*AT91C_PWMC_ENA = AT91C_PWMC_CHID2; //PWMC Enable Register
}
//타이밍도 486
//파형의 왼쪽을 늘이고 줄이는 레지스터 CDTY
//파형의 오른쪽을 조절하는 레지스터 CPRD
void Set_Duty(int iDuty) //duty rate 조절
{
if(iDuty > MAXDUTY)
iDuty = MAXDUTY;
else if( 0 > iDuty)
iDuty = 0;
//파형 중간에 듀티비를 수정할 수 없음으로 update register를 사용한다.
*AT91C_PWMC_CH2_CUPDR = iDuty;//Channel Update Register
} |
동영상 - https://www.youtube.com/watch?v=a9irzMGpZFc&feature=youtu.be
