Firmware design

AN3288

14/27

Doc ID 18011 Rev 2

else if(acc<thr2) /* it corresponds to a medium braking effort */

{...

TIM1_SetCompare1(PWM2); /* set the PWM duty cycle to 50% */

brk_stat = TRUE;

...

}

else if(acc<thr1) /* it corresponds to a soft braking effort */

{...

TIM1_SetCompare1(PWM1); /* set the PWM duty cycle to 75% */

brk_stat = TRUE;

...

}

else /* if no braking */

{TIM1_SetCompare1(PWM0); /* PWM duty cycle to 100% set LEDs OFF */

brk_stat = FALSE;

}

For each deceleration range, the MCU sets the PWM signal duty cycle in order to switch

LEDs ON when a braking occurs, and then an internal timer starts to manage the light

duration.