PIC's ports individual bits manipulation - how to?

[flotulopex]

Right then Mister_e, that's the one I had a hard time to make work...

Maybe I should insist a little more.

The simulator I use is that easy... but maybe not fully reliable so it may be worth to spend more time on the MELABS Sim programmer.

[skimask]

Right then Mister_e, that's the one I had a hard time to make work...

Maybe I should insist a little more.

The simulator I use is that easy... but maybe not fully reliable so it may be worth to spend more time on the MELABS Sim programmer.

I don't know if the MPLABs simulator is 'hard to use', at least I don't think so anyways. There is a bit of an initial learning curve to figure out which windows to use, which keystrokes and which functions key are really handy, etc.
All I do it pull up MPSIM, load the .asm file that PBP gave me, and run it, or single step it or whatever. Yes, you need to have some input values, and maybe a stimulus file, but I don't use any of that and just set my program up to 'fake' those values.
All I can say is that MPSIM has always treated me right...and I especially like the 'stopwatch' function.

[mister_e]

Well it's actually pretty simple once you know how.

Start a new project using the usual method, then Select MPLAB Sim and compile your code.

Go to View> Watch, right to Add Symbol chose the variable you want to monitor and add them in the list.

If you want to monitor a PORT ouput, you go on the Add SFR side.

Once done, press f9 and enjoy the show.

If you have some PAUSE, PAUSEUS in your code... comment them.

You can use and create your Code in MPLAB and use the animate mode... it works. You just need to install properly the MPLAB plug-in. Easier to figure out than the .ASM file.

Today i notice that Microchip have added the VSM plug-in. I need to laugh and waste some time... i'll try it...

[flotulopex]

Well it's actually pretty simple once you know how.

Ça, c'est la phrase qui tue :-)

I wish this could be as simple as it looks like... to your (expert) eyes.

Going to sleep now but tomorrow, MELABS will have to be nice with me!

Bonne nuit.

[mister_e]

MELABS or MPLAB?

Bonne nuit

[mister_e]

Update to the VSM... painful and useless as you can't create your OWN neither modify the provided sample...

Idiot and useless...

[SteveB]

I might have misread the original intent, but you did ask:

How is it possible to handle ONLY those four bits wihtout modifying the other (MSB) four bits?

"Under the hood" PBP will either write to the port as a Byte, or set/clear individual bits. This means you have 2 basic approaches:
1) Dave's approach, which deals with the port as a byte. This uses some bit manipulation to preserve the status of the MSBs.
2) And what I was trying to get at, but was not very clear, and that is to set each bit individually.

Just so I've got it straight, as your FOR...NEXT loop counts from 0 to 3 you would like to see a pattern on PORTAs LSB like: 0001, 0010, 0100, 1000. Is this correct?

If this is the case, then this should work:

Digit VAR Byte
DCD_temp VAR Byte

FOR Digit = 0 TO 3
     DCD_temp = DCD Digit 
     PORTA.0 = DCD_temp.0
     PORTA.1 = DCD_temp.1
     PORTA.2 = DCD_temp.2
     PORTA.3 = DCD_temp.3
NEXT Digit

SteveB

[nish]

hi all
i m new to pic16f877a.i need a help regarding timers in pic 16f877a.
in the timer1,T1CON register what is the purpose of using T1OSCEN bit and the T1SYNC bit.if we are using T1SYNC bit,with what signal it will get synchronised and the purpose of synchronization.expecting the reply.

thanx n advance

nish