HPWM with zero duty cycle on PIC18F2550

[missouri100]

I have attempted to attach the code. I couldn't figure out how to insert it.

I have an autocad wiring diagram but haven't figured out how to attach it or insert it yet.

Sort of a humbling experience.

thanks

[cyberroth]

Consider this section of your code:

'create a  +/- value centered at 512
    left1 = abs(analogleft-512)
    right1 = abs(analogright-512)
    
    'scale value and create centered deadband of +/-10
    'value should fall between -10 and 256 for duty cycle
    
    dutycycleleft = ((left1 * 52)/100)-10
    dutycycleright =  ((right1 *52)/100)-10

PBP only supports unsigned integers, meaning negative numbers are not supported. There can be no "-10"

For example, you have a word variable "dutycycleleft". As a word, it can hold a value from 0 to 65555. If the current value is 5 and you subtract 10 then the variable will underflow by 5 and become 65531 instead of -5. This will cause the PWM to go full on.

A quick and dirty way to fix the code is to take this from your code:

if dutycycleleft < 1 then       'if dutycycle is between -10 and 1
       dutycycleleft = 0         'then it equals zero
    endif

And change it to:

  if dutycycle left > 300 then
      dutycycleleft = 0
  endif

Do the same for dutycycleright

Try this and let me know how it works out

[SUNFLOWER]

if dutycycle left > 255 then
dutycycleleft = 0
endif

Or whatever -- HPWM value must be 0 to 255.

[SUNFLOWER]

if dutycycle left > 32777 then
dutycycleleft = 0
elseif dutycycle left > 255 then dutycycleleft = 255
endif

Or whatever -- HPWM value must be 0 to 255.