A problem with PORTF

[CGEngineering]

Hi,

today i discovered a little problem with my mikroC 7.0 beta.
If i set PORTF (i use a pic18f8621) like this :

Code: Select all

TRISF = 0x00

Means that PORTF is all-outputs, and then i would like to access single pins using this :

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PORTF.F0 = 0;
PORTF.F1 = 1;

etc. But it doesn't work!

Using that, instead :

Code: Select all

PORTF = 0x02

it works perfectly. I think that there are some problems with bit-wise operations

Bye
CG

[picdog]

Hello!
just curious for your post, I tried quickly this snippet:

void main(void) {
TRISF = 0x00;
PORTF.F0=0;
PORTF.F1=1;
}

compiling it with 7.0beta on target 18F8722 (and then 18F8621).

With the internal simulator it works. I tried also other combinations of bits. I have many firmwares that are on the field compiled with 6.2.1.0 and they do extensive use of .Fx, so I was very interested in checking this, but I am not able to reproduce your error, so if possible please post the exact your code.
Thank you and have a good weekend!
picdog

[CGEngineering]

Hello!
just curious for your post, I tried quickly this snippet:

void main(void) {
TRISF = 0x00;
PORTF.F0=0;
PORTF.F1=1;
}

-cut-

am not able to reproduce your error, so if possible please post the exact your code.

Hi!
thanks for your reply. I modified the code before reading this post, so i can't copy/paste what i wrote on friday.
I don't use simulators, i write into a real uC and switch the power on .
I noted that this bit-wise problem is only on PORTF .
I haven't tried on other uCs because i'm working with this at the moment (PIC18F8621 or PIC18F8622)

Bye
CG

[bruno]

Hello,

did you disable ADC and comparator modules ? they all are multiplexed with PORTF pins.
ADCON1 register should be set to 0x0f to have full PORTF as digital I/O.

[janni]

I don't use simulators, i write into a real uC and switch the power on .
I noted that this bit-wise problem is only on PORTF .

It could have been RMW (read-modify-write) problem rather than compiler issue. Use LATF instead of PORTF.

[picdog]

Hello CGEngineering!
I also use real uC, when possible but now are at holidays

But Iuse also Proteus VSM simulator. I hold the license for PIC24, unfortunately not for PIC18 It is a complete simulator, with also interrupts, watchdog, and issues related to ADCON & other SFRs. So many times it is very useful to replicate the things.

Hope I can be helpful to you in the future. I appreciate very much your posts!

picdog