用AtmelStudio6.2跑mega16例程（4）

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楼主 | 2014-8-28 22:15 | 只看该作者 |只看大图回帖奖励

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mega16, Atmelstudio, TI, ni, ic

由定时器产生的PWM 通过PD4，PD5输出

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/*

 * GccApplication6.c

 *

 * Created: 2014-8-28 21:50:18

 *  Author: Administrator

 */ 





#include <avr/io.h>

#include <avr/interrupt.h>

//PWM输出程序

//在端口PD4,PD5（led5,led6）输出PWM脉冲,可用示波器测量,或者外加一LED灯，可以看到LED由于脉宽的变化引起的灯的亮度不同



//#include <macros.h>



void port_init(void)

{

        PORTA = 0x00;

        DDRA  = 0x00;

        PORTB = 0x00;

        DDRB  = 0x08;

        PORTC = 0x00; //m103 output only

        DDRC  = 0x00;

        PORTD = 0xff;

        DDRD  = 0xff;

}



//TIMER1 initialize - prescale:64

// WGM: 10) PWM phz correct, TOP= ICRn

// desired value: 1000Hz

// actual value: 1000.000Hz (0.0%)

void timer1_init(void)

{

        TCCR1B = 0x00; //stop

        TCNT1H = 0xFF; //setup

        TCNT1L = 0x83;

        OCR1AH = 0x00;

        OCR1AL = 0x65; //占空比

        OCR1BH = 0x00;

        OCR1BL = 0x1f; //占空比

        ICR1H  = 0x00;

        ICR1L  = 0x7D;

        TCCR1A = 0xA2;

        TCCR1B = 0x13; //start Timer

}



//call this routine to initialize all peripherals

void init_devices(void)

{

        //stop errant interrupts until set up

        cli();//CLI(); //disable all interrupts

        port_init();

        timer1_init();



        MCUCR = 0x00;

        GICR  = 0x00;

        TIMSK = 0x00; //timer interrupt sources

        sei();//SEI(); //re-enable interrupts

        //all peripherals are now initialized

}



int main(void)

{

        init_devices();

}