Timer works at double speed compared to what the calculator

[Malmir]

Hi.
I like this timer calculator Tool, but not my chip . I have tried to do some clicks at 2.5 ms and 100 ms. Both are calculated in the calculator software. But when running in the chip I get clicks at 1.25 ms and 50 ms.
Any clues ??? I am so tired now, that i for sure might see the error, without knowing it .
Thanks in advance
BRGDs
Klavs.

[marko.stankovic]

Hi,

Can you tell me which microcontroller and the oscillator you use?

Best regards,

[Malmir]

Ups Sorry.
I use a STM32F103R8 with an external 8MHz crystal.

[andreadipietro]

Hello!, I have same problem! Any solution? LD1 on clicker 2 blink much speed than I predict.

//Timer0
//Prescaler 1:32; TMR0 Preload = 3036; Actual Interrupt Time : 1

//Place/Copy this part in declaration section
void InitTimer0(){
T0CON = 0x84;
TMR0H = 0x0B;
TMR0L = 0xDC;
GIE_bit = 1;
TMR0IE_bit = 1;
}

void Interrupt(){
if (TMR0IF_bit){
TMR0IF_bit = 0;
TMR0H = 0x0B;
TMR0L = 0xDC;
//Enter your code here
}
}

Thanks.

[stefan.filipovic]

Hi,

I realized from this part of the code that you use Clicker 2 for PIC18, but I'm not sure whether it's for PIC18FK or PIC18FJ, I guess that's the Clicker 2 for PIC18FJ.
I tried this with the Clicker 2 for PIC18FJ in several ways, but unfortunately, I was not able to reproduce this issue successfully.
Could you please attach a minimal project which reproduces this issue?

Kind regards,

[andreadipietro]

Thanks dear,

this is my project. And the proof of issue.

[stefan.filipovic]

Hi,

I just tested your project on my Clicker 2 for PIC18FJ, and unfortunately, it works as it should work.
Can you tell me does the LD1 and LD2 blinking separately with the 1s delay after loading the hex file which I just attached?

Kind regards

[andreadipietro]

Here, the frequency..

[stefan.filipovic]

Hi,

I just noticed that you are using the bootloader for programming.
In this case, if you use USB HID Bootloader you should use PLL in the config bits (on the top of the main function you also should put this code line PLLEN_bit = 1; ) and set MCU frequency to 48MHz, also you will need to generate Timer Interrupts for this MCU frequency.

Please find your modified project in the attachment.

Kind regards,

[andreadipietro]

Hi dear!

Finally, we are in the point! Now everything works! Thank you!

PLLEN_bit = 1; and Timer Calculator on 48Mhz.

This is an indirect way, but it works.

[stefan.filipovic]

Hi,

You're welcome.

I'm glad that we managed to solve this.

Kind regards,