Pic16f877 + "C/C++" + PICSTART plus

striker2509 said:

there it goes.....this ocurrs during the verify proccess

im using MPLAB v.7.01, it also occurs in V.7.10

and PICSTART plus as a programmer

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striker2509 said:

got it...thans mike....but in order to understand your code....i need to know...what does the comf instruction?

let me try your code. But how im supossed to watch if the interrupt is ocurring

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org 0004

; save W and STATUS
movwf W_TEMP
movf STATUS, w
clrf STATUS
movwf STATUS_TEMP

; put your interrupt handling code here

; restore W and STATUS
movf STATUS_TEMP, w
movwf STATUS
swapf W_TEMP, f
swapf W_TEMP, w

retfie

striker2509 said:

1. the interrupt routine its suppose to be working, right, as you just told me....its supossed to change on and off... the question is... RB4-RB7 are low....when i switch one of them.....no matter which one...the led flashes like 5 seconds and then remains on....as i understand the code...its suppose to turn on (if the led is off) when an interrupt occurs....right?

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striker2509 said:

2. The other thing is....Should i erase portB value or so...because as i can see the program takes the initial value of RB4-RB7 and saves it. And no matter if i reset the pic....it takes the saved value...As i said before, the pic is acting that way

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striker2509 said:

3. Going a bit farther, if i want to set some output pins after an interrupt occurs, should i do this in the ISR or in the main loop, cause as u told me, the ISR only takes 5 seconds to act...right?

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striker2509 said:

As i was saying to Jay.Slovak, its very hard to explain something in a foreign language. But im tried to be explicit. Sorry if i confused you.

The flashing of the led during the interruption could occur just because im switching the RB4-RB7 manually?

My project consist in develop a Switching Matrix for some Measurement Equipment. Sorry for my english so far and foward.

Now, The Switching Matrix (work with biestables latches) is 20x20, one latch per connection point. Follow me. Now, in order to controlled the 400 switches (latches), i thougth that i can save a lot of space using demux (4 to 16 lines) and i could connect one latch per demux output.

Implement the circuit this way, im only need control signals (from the pic) in the demux enable pin. And 4 data bits that tells the demux which latch must be set. Right?

In the final project. The RB4-RB7 are data bits from the PC. There is 14 circuits in the evaluation (measurement test) proccess. And 4 bits data gives me the possiblity of 16 diferent circuits. Now, every circuit does not connect more than 20 points (max, i think). And checking the value of Pins RB4-RB7, the pic has to set the latches associated with that value.

I hope you understand me know mike. Right now, im just working with 1 demux, in the final project, some pics (like 3) has to control like 20 demux and give them the data bits to activate the latches.

If anyone here knows spanish. Well, i gladly explain it in spanish.

Hoping you are not confused anymore. Thanks again pal

Striker

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striker2509 said:

dont get it, really dont

striker

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