ATMage16的16位定時器的PWM應(yīng)用

// Target : M16
// Crystal: 8.0000Mhz
//TIMER1 initialize - prescale:64
// WGM: 10) PWM phz correct, TOP= ICRn
// desired value: 1Hz
// actual value: 1.000Hz (0.0%)


#include
#include

#define PWM1A PORTD5 //OC1A PD5
#define PWM1B PORTD4 //OC1B PD4
unsigned char OCAH;
unsigned char OCAL;
unsigned char OCBH;
unsigned char OCBL;

void timer1_init(void)
{
TCCR1B = 0x00; //stop
TCNT1H = 0x00; //setup
TCNT1L = 0x01;
OCR1AH = OCAH;
OCR1AL = OCAL;
OCR1BH = OCBH;
OCR1BL = OCBL;
ICR1H = 0xff; // pwm 的計數(shù)頂值
ICR1L = 0xFF;
TCCR1A = 0xA3; // 匹配清零 top置位
TCCR1B = 0x0B; // start Timer
}

void init_devices(unsigned char valueah,unsigned char valueal,unsigned char valuebh,unsigned char valuebl)
{

OCAH=valueah;
OCAL=valueal;
OCBH=valuebh;
OCBL=valuebl;
CLI();
//disable all interrupts
timer1_init();
MCUCR = 0x00;
GICR = 0x00;
TIMSK = 0x04; //timer interrupt sources
SEI(); //re-enable interrupts

}


void main(void)
{
PORTD&=(0<DDRD|=(1<init_devices(0x0f,0x45,0x0f,0xf0); //修改實參即可改變占空比,最大值為0X0FFF;
while(1);
}

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