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#define f_base 13000
unsigned int du = 0, du_OCR = f_base;

void setup() {   
//  ====================================================================
Serial.begin(57600);
//  ====================================================================
  DDRD =  B00011000;
  PORTD = B00100000;
    DDRB = B000010;
    PORTB = B000000;
//  TCCR1A = (1<<COM1A1)|(1<<COM1A0)|(1<<WGM11);
//  TCCR1B = (1<<WGM13)|(1<<WGM12)|(1<<CS10);       // mode 14 1110 = Fast Pwm to ICR1
//  TCCR1A = 0xC2;  TCCR1B = 0x19;
cli (); TCCR1A = 0; TCCR1B = 0; ICR1 = f_base; sei ();
    } 

void loop() { 
 if ((PIND&(1<<PIND5))==0) { soft_start(); }  
  }  
 
void soft_start() { cli(); TCCR1A = 0xC2; TCCR1B = 0x19; sei();
label:
  OCR1A = du_OCR; du_OCR = du_OCR-130; delay (25);  
  Serial.print(du_OCR,1);Serial.println(" stp "); 
if (du_OCR > 100 && (PIND&(1<<PIND5))==0){ goto label;}   

cli (); TCCR1A = 0; TCCR1B = 0; ICR1 = f_base; sei ();
  du_OCR = f_base;
  }