Pb with Servo component

[Mathy]

Hi !

I have some troubles with the Servo component on 18F2520 and ECIO 28 for example.

The simulation on Flowcode and compilation works well but dont into the real life.

The simulation in Proteus doesn't work. If I assign an output to the servo0, for example B0, I have nothing on B0, only on A0 but the setting is B0...

I have the same problem with the Matrix Multimedia program example.

It is possible to check if i'm alone in the world in front of this bug ?

Have a nice day.

[Steve]

I've looked at the code generated by Flowcode and it seems fine to me (I don't have hardware handly to test with).

Please confirm which version of Flowcode you are using and also post the generated C code file and I should be able to help more.

[Mathy]

Hi Steeve,

I'm working on the servo component.

I already tried last year but without more result.

I made a little program who set 127 to the servomoteur number 0 connected to the RB2 pin.

It works well on ECIO40 but nothing on an other hardware with a 18F2420.
I tried with different hardware but without any success.
I think my hard is ok because It can flashing a led a the good rate on RA4.

You have the two little program on the attached files. One for my hard, the other for ECIO40.

Can you help me ? I realy need to use servomotor

[Mathy]

With Proteus simulation, I have the same problem on the 18F2420 but it works well with 18F6627.

Is it a problem on the FCD file ?

[Benj]

Hello,

In the chip configuration you could try disabling the Extended CPU enable bit.

Have you also tried the 1 second flasher technique on the 18F2420 to make sure that the chip is running at 40MHz? I take it you are using a crystal value of 10MHz.

[Mathy]

Hi Benj,

I'm out of the office now. I will try tomorrow in the morning about the Extended CPU Enable bit.

Im pretty sure that the chip running at 40 Mhz because I always choose 40 Mhz for all my boards in the project setting with a 10 Mhz crystal and the PLL x 4 set for the fuse.

My LED on RA4 flash at the good rate so I think the truth is out there !

Also, I try too choose a 18F242 instead of 18F2420 in the project setting. I import the hex generated in my 18F2420 and......it works.

But I think that de difference between the 242 and the 2420 could create some trouble in my application.....no ?
What do you think about that ?

Thanks for your help,

Mathy

[Mathy]

Hello !

I try the Extented CPU Enable bit tips but without any success.

I test in simulation with Proteus and in the real life on my own hardware.

I think you have Proteus because of your schematics we can see on many of your datasheet. If you want I can upload you the .DSN to try something.

Mathy

[Benj]

Hello Mathy,

Looking at the 18F2420 device it looks like it has a slightly unusual capture compare peripheral. I would compare the device datasheets of the 18F242 and the 18F2420 and see if you can spot the key differences in the CCPxCON registers. Then modify the C code to suit.

If you get stuck then let me know and I will have a look into this for you.