Microchip PIC Forum: December 2007

Thursday, December 13, 2007

Re: [piclist] Re: address decode on serial

You can't get a PC to generate it. PC UARTS aren't capable of it. You
need to get a RS485 module between the network and the PC to handle that
part of the protocol. With enough effort you might get the PC to do some
kind of parity bit fiddling to get it to work, but an interface dongle is
a bit simpler to manage I think.

DLC

> 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
>>
>
>
>
>
> to unsubscribe, go to http://www.yahoogroups.com and follow the
> instructions
> Yahoo! Groups Links
>
>
>
>

--
Dennis Clark
TTT Enterprises

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Re: [piclist] Re: web copy of the list

On 13/12/2007, Lez <lez.briddon@googlemail.com> wrote:
> On 13/12/2007, Ronald C. Barnes <ka1kjz@cox.net> wrote:
> >
> >
> >
> >
> >
> >
> > Thank you for calling this to my attention, it is not sanctioned by this list. This member has been banned and the blog reported to blogspot.
>
> Thanks, seems my idle day in front the pc has not been in vain!

<cough> its still happening!

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Re: [piclist] Re: web copy of the list

On 13/12/2007, Ronald C. Barnes <ka1kjz@cox.net> wrote:
>
>
>
>
>
>
> Thank you for calling this to my attention, it is not sanctioned by this list. This member has been banned and the blog reported to blogspot.

Thanks, seems my idle day in front the pc has not been in vain!

The only thing that bothered me was it making my email visible to the
world, as it was my @googlemail.com address, I usually use a separate
email for everything and have it redirected, if one starts to get
spam, I can stop redirecting it and start another, but now my secret
identity is known, and I will forever receive asking if I need to
increase the size of my RAM........

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Re: [piclist] Re: web copy of the list

Thank you for calling this to my attention, it is not sanctioned by this list. This member has been banned and the blog reported to blogspot.

At 01:48 PM 12/13/2007, you wrote:

Ok seems to be getting forwarded to blog with posts by ''samantha'',
but a quick search on here does not show a ''samantha'' posting.

http://microchippicforum.blogspot.com/

It does have a flag if this blog is offensive button, I suppose its up
to the users to decide if having their posts mirrored without
consultation is offensive.

I for one am not damn happy, as it shows my email, which no doubt is
one way that my email keeps getting damn spam, having it shown on a
website for a spider to find.

''thankyou'' samantha ..............

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

There are several free and open source bootloaders out there.
Just Google for "pic bootloader"

james pruett wrote:

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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<http://home.online.no/~eikarlse/index.htm>
LAST UPDATED: 23/08/2003
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RE: [piclist] USB and 18f2550

Try Oshonsoft Pic18_Sim_Ide at www.oshonsoft.com. The simulator,
basic compiler is 29 euro. There is an addon for USB. Under projects
you will find a bootloader for the 18F series. The bootloader uses
the serial port which may be better than using the USB for
bootloading. You can play with Pic18_Sim_Ide with out paying for the
product to get a feeling for it. 29Euro is a great deal.

Richard

---- Original Message ----
From: lez.briddon@googlemail.com
To: piclist@yahoogroups.com
Subject: [piclist] USB and 18f2550
Date: Thu, 13 Dec 2007 15:27:11 +0000

>I want to programa 18f2550 with nothing more complicated than a usb
>cable..........
>
>Now I know that first time round I need to serial program into it and
>then....
>
>
>(a) bootloader into pic
>
>(b) assemble all my code starting above the bootloader (say org0x800
>etc)
>
>(c) have some software to ''send'' this assembled hex file to the pic
>
>
>I have no idea what to use for (a) as they are a few out there and
>for
>(c) I have seen nothing but people must be using something!
>
>/insert clue ...............

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[piclist] Re: web copy of the list

Ok seems to be getting forwarded to blog with posts by ''samantha'',
but a quick search on here does not show a ''samantha'' posting.

http://microchippicforum.blogspot.com/

It does have a flag if this blog is offensive button, I suppose its up
to the users to decide if having their posts mirrored without
consultation is offensive.

I for one am not damn happy, as it shows my email, which no doubt is
one way that my email keeps getting damn spam, having it shown on a
website for a spider to find.

''thankyou'' samantha ..............

__._,_.___

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to unsubscribe, go to http://www.yahoogroups.com and follow the instructions

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Re: [piclist] USB and 18f2550

> > For the c part is google your friend:
> > http://www.sprut.de/electronic/soft/usboot/usboot.htm
> >
>
> Oh no its not it lies to me...............
>
> but I am off to look at that now thanks.
>

I think it likes me more :)

good luck :)

joris

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Re: [piclist] USB and 18f2550

> For the c part is google your friend:
> http://www.sprut.de/electronic/soft/usboot/usboot.htm
>

Oh no its not it lies to me...............

but I am off to look at that now thanks.

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[piclist] web copy of the list

for how long has this list had a web copy available, I made a post on
here an hour or so ago, then found *my* post on a website ! (via
google)

Post (c) L. Briddon 2007 - unauthorised web 'bloggin' of my post could
lead to strong emails asking questions about the parentage of your
mother...

tracking id: ttj412d

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Re: [piclist] USB and 18f2550

Well to put the bootloaderin you could use a galvawisp,
http://www.picbasic.nl/galvawisp2_uk.htm. I got one and like it a lot,
cheap and reliable.

For the c part is google your friend:
http://www.sprut.de/electronic/soft/usboot/usboot.htm

good luck
Joris

On Dec 13, 2007 4:27 PM, Lez <lez.briddon@googlemail.com> wrote:
>
>
>
>
> I want to programa 18f2550 with nothing more complicated than a usb
> cable..........
>
> Now I know that first time round I need to serial program into it and
> then....
>
> (a) bootloader into pic
>
> (b) assemble all my code starting above the bootloader (say org0x800 etc)
>
> (c) have some software to ''send'' this assembled hex file to the pic
>
> I have no idea what to use for (a) as they are a few out there and for
> (c) I have seen nothing but people must be using something!
>
> /insert clue ...............
>