PWM=>factor umplere&frecventa

[asyx]

imaginea postata a doua oara este doar uCul, fara sarcina, am deconectat rezistenta din baza tranzistorului si am pus testerul pe rezinstenta.Iar pe iesire are totusi varfuri.

sa fie ceva din prgramare?

[criss]

atasez si programul.

 

Cuprinde mai multe 'magarii' dar eu doar partea cu PWMul il folosesc.

 

#include <avr/io.h>#include <avr/interrupt.h> #include "lcd.h"#include <stdlib.h>#include <inttypes.h>char s[7];volatile unsigned char LcdDelay;   // 200 mS LCD delaystatic uint32_t new_value; // button //---------- timer ----------------------------ISR (TIMER0_OVF_vect) {// timer static unsigned char Count1mS = 0;  static unsigned char Count10mS = 0;   TCNT0 += 6; // Adjust count so we get 250 uS rollover period      if (++Count1mS == 2)   {      // Set a flag to indicate 1mS has elapsed      Count1mS = 0;	if (++Count10mS == 200) // 200ms	{	Count10mS = 0;	LcdDelay = 1;	}		}}// -------------------------------------------------------------------void Timer_0_setup(void){// setup timer 0 TCCR0 |= (1 << CS01); // 8 dividerTCNT0 = 0;            // Initial value TIMSK |= (1<<TOIE0); //Timer/Counter0 Overflow Interrupt Enable }//------------------------------output pwm control------------------------------------- void pwm(void){// Fast PWM 14; ICR1 Clear OC1A/OC1B on Compare Match, set OC1A/OC1B at BOTTOM, (non-inverting mode)   TCCR1A  = ((1<<WGM11) | (1 << COM1A1) );   // Fast PWM, Fcpu speed; clkI/O/8 (From prescaler)   TCCR1B  = ((1<<WGM13) | (1<<WGM12) | (1 << CS11));   //where 0xA is the desired brightness   ICR1  = 24; // 20 khz}//-------------------------------------------------------------------int main(void){DDRB |= (1 << 1); // Set led as outputTimer_0_setup();pwm();// LCD initlcd_init(LCD_DISP_ON); /* initialize display, cursor off */lcd_clrscr(); /* clear the screen*/sei();  while (1) /* loop forever */   {OCR1A=new_value;new_value=7;if (LcdDelay==1){lcd_clrscr();  lcd_gotoxy( 0, 0 );	lcd_puts("%:");lcd_gotoxy( 8, 0 );	 utoa(new_value, s, 10);lcd_puts(s);LcdDelay = 0;}}}

uCul ruleaza la 4Mhz ceas intern.