writing to Program memory in PIC controllers

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Hi!

With reference to the do
http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t38%003&start=all&postdays=0&postorder=asc

,it's possible to write directly into the program memory section in AV
controller ,I would like to know whether it is possible to follow
similar kind of procedure for PIC controllers as well.

(I use an MPLAB v7 for programming the PICs )

Thanks in advance,





Re: writing to Program memory in PIC controllers
On Wed, 02 Jan 2008 10:23:17 -0600, "aroravaibhav87"

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The current version is 8.01, not that it matters much for most parts.

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Yes, but for *some* flash types only (generally not the
cheapest/smallest ones, but there may be exceptions).

Best regards,
Spehro Pefhany
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Re: writing to Program memory in PIC controllers
On Wed, 02 Jan 2008 10:23:17 -0600, "aroravaibhav87"

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Some PICs yes, some PICs no.  Name your PIC.

--
Dan Henry

Re: writing to Program memory in PIC controllers
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currently  I am using PIC 30F series ( 30F2010 ),
but even if it does not support that feature I would be interested i
knowing the procedure for writing data directly into the prog mem of othe
PICs , as I  might switch over to some other PIC .

Re: writing to Program memory in PIC controllers
On Wed, 02 Jan 2008 23:01:56 -0600, "aroravaibhav87"

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Programming PIC 30F series flash is described in the reference manual
section(s) downloadable from Microchip.  You also need to consult the
data sheet for your particular device since row lengths may vary.

The procedures for other PIC families are likewise described in their
respective reference manuals and data sheets.

--
Dan Henry

Re: writing to Program memory in PIC controllers

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You forgot some text: Your mileage may vary. This posting contains
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FDIC insured. Caution: microwave meal will be hot after heating.



Re: writing to Program memory in PIC controllers

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Don't forget that hot coffee is also served hot. I saw a message to
that effect in the McDonalds drive-through recently.

Why is it that lawyers were only born with half a brain?

Eric

Re: writing to Program memory in PIC controllers

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Starbucks cups say something like "The beverage you are about to enjoy
is extremely hot". I'd like to revise that text, surreptitiously, to
something more of the order of "Caution: The beverage you will shortly
be raising to your lips, while capable of conveying your taste and
olfactory senses unto the utmost seventh heaven of ecstasy, will
simultaneously scald, sear and deglove your tongue with the
excruciating pain of a beverage dipped directly from a lake in hell".

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Judges and juries, not lawyers, are the root of this evil. Without
those credulous simpletons roaming the streets ready to judge in favor
of massive damages for ludicrous lawsuits, we would not need such
disclaimers, and liability insurance would be pennies per month.
Lawyers are the facilitators, not the cause, of stupidity.


Re: writing to Program memory in PIC controllers
In message
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I thought that until some one sent me a link to the case history.  Turns
out McDonnell's were intentionally running their coffee some 20 degrees
hotter than anyone else for reasons of storage life when brewed.  On a
drive through where spillage is more likely burns from MacDonalds coffee
would be (and were) substantially worse than any other coffee shop.
Hence the "scalded by a hot cup of coffee" law suite.  And the
complainant won against McD I believe.

This is why McDonalds put the signs up (and had to set the temperature
on the coffee some 20 degrees lower).


--
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Re: writing to Program memory in PIC controllers

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Tip of the iceberg, as far as lawsuits vs. frivolity go.

BTW that story was always very counter-intuitive to me - I would
expect that increasing the temp would REDUCE the shelf life. Very
strange.

Re: writing to Program memory in PIC controllers
In message
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Yes.


Me too. Never did work it out.
--
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\/\/\/\/\ Chris Hills  Staffs  England     /\/\/\/\/
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Re: writing to Program memory in PIC controllers
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Re: writing to Program memory in PIC controllers
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After looking at the link you posted, it looks to me like you want to
know how to store C language constants in flash memory? That is, you
want to compile them into your code, and burn them into the target
chip at the same time you download your program, right?

That is certainly possible with the PIC24/dsPIC devices. They have a
special architecture that lets you map the 24-bit program memory bus
over to the 16-bit data memory bus. I think this is called Program
Visibility, or something like that. C30 handles that for you
automatically.

There's actually 2 ways to view program memory as data on that chip
family. The other is via a special table assembler instruction. C30
supports both of these, and you don't have to know the underlying
details.

const char buf[] 3D% "abc"; // constant data is stored in flash and
accessed automatically via Program Visibility (you write zero code)

char buf[] 3D% "abc"; // this is an initialized value. It's stored in
flash and copied to RAM in the startup code. That uses the table
method internally. This is a little more memory efficient because it
can use every byte of flash. The Program Visibility method actually
wastes 1 byte out of every 3 because 24 bits don't map directly to 16
bits. But Program Visibility lets you directly read flash data at
runtime without first copying them over to RAM, which is needed with
non-consts.

My discussion above does NOT tell you how to write to flash memory at
runtime. This is strictly a discusssion of how to store constants in
flash at the time you download your program to the chip. Writing to
flash at runtime is much harder.

Eric


Re: writing to Program memory in PIC controllers
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dochttp://www.avrfreaks.net/index.php?name3D%PNphpBB =
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AVR



Thanks for all the info , the two methods that you described work fine
but I was actually for a way by which I could store some constants int
the chip independent of the program itself, ie I do not have to write th
data variables in the program itself, but download the variables in th
program flash directly.



Re: writing to Program memory in PIC controllers
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dochttp://www.avrfreaks.net/index.php?name3D%PNphpBB =
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AVR



Thanks for all the info , the two methods that you described work fine
but I was actually for a way by which I could store some constants int
the chip independent of the program itself, ie I do not have to write th
data variables in the program itself, but download the variables in th
program flash directly.



Re: writing to Program memory in PIC controllers
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