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#USE PWM and bootloader [18F26K22]

 
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Milentije89



Joined: 07 Apr 2017
Posts: 31

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#USE PWM and bootloader [18F26K22]
PostPosted: Fri Mar 27, 2020 5:50 am     Reply with quote

Hello to you all!

I am having a bit of a problem. I have found the source of a problem, and also found the solution. But, I am not satisfied with the solution, so I am opening this thread.

MCU: PIC18F26K22 @5V
Compiler version: 5.075

I am using PWM for driving a buzzer. PWM output pin is B3.

PWM is set using #USE PWM

Code:
#use PWM (STREAM = BUZZ, PWM2, OUTPUT = PIN_B3, TIMER = 2, FREQUENCY=2730, DUTY = 50, PWM_OFF)


PWM is working when HEX is programmed directly (without bootloader).

When I program the MCU using bootloader with the same HEX (addresses are set correctly ofcourse), everything works except the PWM.

Then I added #USE PWM line to the bootloader and programmed everything again. Now, PWM works when HEX is programmed via bootloader.

Checking the .LST file i saw some fuses that are setting CCP2 and CCP3 in/out. That is how I found the source of a problem.

But, for everything to work, I have to have #USE PWM line in bootloader as well as in "main" program. If I delete #USE PWM line from main program then none of the functions related to PWM doesn't work (PWM is not initiated/setup correctly).

Is there a way around this problem? I would like to evade adding #USE PWM line in a bootloader.

TIA,
Milos

EDIT: Sorry, I posted this thread in wrong subforum... It should be in General Discussion. My bad, sorry.

EDIT 2: There is a solution. Just add CCP2B3 fuse in bootloader.
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Fri Mar 27, 2020 7:18 am     Reply with quote

Yes.

If you looked at the .LST for the main program you would see that the
#USE PWM line resulted in this fuse being added to the code.

Now the fuses the bootloader programs must always match what the
'main' needs to have....
Milentije89



Joined: 07 Apr 2017
Posts: 31

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PostPosted: Fri Mar 27, 2020 7:29 am     Reply with quote

It is good to talk with yourself from time to time. It helps you solve the problem. Very Happy
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