Microchip PIC Forum

Thursday, December 6, 2007

[piclist] Re: [ee:] EAGLE PCB-CAD

You need a gerber viewer to check the output files.

GCPREVUE is free.

I didnt buy eagle but bought pcbcad30 and that already comes with its own gerber viewer.

I was a bit perturbed at you finding 3 hole sizes where only one was used.

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[piclist] Re: 12F675 Startup Problems

Are you going back to bank 0 after the osccal is set ?

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[piclist] 12F675 Startup Problems

I'm using a serial routine on a 12F675 and started by sending out the
word "HELLO" over and over. Funny thing is while it's powered on I get
nothing out, but the instant I remove power it sends out 10 or 11
characters. The filter cap is powering it for that fraction of a
second. The circuit is being powered by a 9V battery with a 78L05 to
regulate it at 5V. My meter reads 4.99v at the pic chip. A logic probe
connected to the output blinks the whole time it is powered up which
should mean that its sending something. I had to include this bit of
code at the very beginning before I got anything at all.
call 0x3FF ; Retrieve Factory Calibration
BANKSEL OSCCAL ; BANK1
movwf OSCCAL

Anyone have any ideas as to what might cause a problem like this?

Thanks, Max

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Tuesday, December 4, 2007

[piclist] Help cant get a WPU to work on pic12f629

Hi all, I have been pulling my hair out trying to enable a WPU in a
12F629. The pin detects an input if i put 5V on it, but shows as
clear when not. If a WPU was set, it should show an input (bit set)
when nothing is on the pin and clear when grounded. Isn't that right?
I have set GP0 as my input and enabled the WPU. Any help appreciated.

START
BCF STATUS,RP0
CLRF GPIO

MOVLW 7H
MOVWF CMCON

BSF STATUS,RP0

MOVLW B'00000010'
MOVWF OPTION_R

MOVLW B'00001001'
MOVWF TRISIO

CALL H'03FF'
MOVWF OSCCAL

MOVLW B'00000001'
MOVWF WPU

BCF STATUS,RP0
;***************************************************************

BEGIN ;WINK THE LIGHTS TO SHOW PROGRAM START

BSF GPIO,GP2
CALL DELAYP5
BCF GPIO,GP2
BSF GPIO,GP5
CALL DELAYP5
BCF GPIO,GP5
CALL DELAYP5

GPTEST BTFSC GPIO,GP0
GOTO GPSET

BSF GPIO,GP4 ;GET HERE AS GP0 CLEAR
BSF GPIO,GP1
CALL DELAY1 ;my 1 second delay routine
BCF GPIO,GP4
BCF GPIO,GP1
GOTO GPTEST

GPSET BSF GPIO, GP2 ;GET HERE AS GP0 SET
BSF GPIO,GP5
CALL DELAY1
BCF GPIO,GP2
BCF GPIO,GP5
GOTO GPTEST
END

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[piclist] Re: address decode on serial

I read about the 9th bit address.....

How do I get the pc to generate it? Im using QBASIC on the pc and
not sure how to create a extra bit there.

Randy

-- In piclist@yahoogroups.com, "Dennis Clark" <dlc@...> wrote:
>
> You don't need to do that with the newer PICs. Read up on "9th bit
> addressing" for the PIC. In this mode the 9th bit is set and the
USART
> recognizes this as an address. Your code then needs only to look
for this
> bit set to pay attention to a byte as an address.
>
> DLC
>
> > Hello all:
> >
> > I have a desire for a project to use a PC as a master, poll
various
> > pics on a rs485 network, using a very simple polling idea and
have
> > the pics respond with their status as well as take data from the
pic
> > if desired.
> >
> > Im working on this in small parts and my first thoughts on
overall
> > programming is this to get the pic to respond to its address:
> >
> > pic watches the data stream for a "sync byte" such as "89"
> > if "89" appears then check the next byte for its address such
as "02"
> > if "02" is its address then respond with its status
> >
> > I tried this before without using the sync byte and the pic
> > responded to any bit sequence that appeared and matched 4 bits.
By
> > using the sync byte, will this help with the false responses? my
> > first attempt was using a addres of "2" and any bit opattern that
> > matched "0010" falsed a response.
> >
> > Serial speed is not set, I tested at 9600.....
> > PIC is 16F627/16F628
> >
> > Im a NOVICE to programming and trying to learn as I go here.
> >
> > All help appreciated!
> >
> > Randy
> > kk4ej
> >
> >
> >
> >
> > to unsubscribe, go to http://www.yahoogroups.com and follow the
> > instructions
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
> --
> Dennis Clark
> TTT Enterprises
>

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Sunday, December 2, 2007

[piclist] What is the cheapest way to put a bootloader inside a PIC16F877A

Eg, what do I buy? I dont need Incircuit emulation and I only use the one chip. Cheap is my middle name.

Thanks for any replys.

I have been using modtronix PICs for 3 years, so its about time I run with the little dogs '-)

-jim

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[piclist] PIC programmer

hello everyone.

i am new to PIC microcontroller,so i need help. However i have a lot
of experience on avr microcontroller but now i want to work on PIC.
i need to know about some homebrew programmer for 16-bit
PIC24FJ64GA002 microcontroller.
i want to program it without using the costly readymade PICSTART
programmer Kit or something like this.
So can someone please tell me the link or some schematic for its
programmer? i will be highly grateful for ur cooperation.

thanks in advance.