writing to Program memory in PIC controllers

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

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

Best regards, Spehro Pefhany

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

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 .

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.

You forgot some text: Your mileage may vary. This posting contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements are based upon the current beliefs and expectations of Usenet and are subject to significant risks and uncertainties. Actual results may differ from those set forth in the forward-looking statements. May lose value. Not FDIC insured. Caution: microwave meal will be hot after heating.

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

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".

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.

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

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).

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.

Yes.

Me too. Never did work it out.

doc

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.

doc

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.

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