I have about 4KB of operational parameters to be stored in non- volitile memory but they will be updated occasionally. I have experience doing this in EEPROM but this is my first encounter with flash. I found the flash routines in the download area but would appreciate a chance to talk to anyone who has experience with updating and erasing segments in flash. I could use the flash or tag on an I2C EEPROM but need to make that decision soon. Thanks, Jeremy jweese@jwee...
Storing parameters in Flash
Started by ●November 4, 2004
Reply by ●November 4, 20042004-11-04
working with internal flash on a msp430 is simple. the docs in ti.com are just ok for assembler. pay attention to the timing. good luck! jkw_ee <jkw_ee@jkw_...> wrote: I have about 4KB of operational parameters to be stored in non-volitile memory but they will be updated occasionally. I have experience doing this in EEPROM but this is my first encounter with flash. I found the flash routines in the download area but would appreciate a chance to talk to anyone who has experience with updating and erasing segments in flash. I could use the flash or tag on an I2C EEPROM but need to make that decision soon. Thanks, Jeremy jweese@jwee... --------------------------------- Do you Yahoo!? Check out the new Yahoo! Front Page. www.yahoo.com/a
Reply by ●November 4, 20042004-11-04
Using flash as a data store is very simple with the MSP430. Flash write
direct from memory (ie you don't have to move the flash write code to
RAM) works exceptionally well in my opinion, and is quicker than most
other devices. I would steer clear of block writes. these can be
unreliable.
I would go back through the archives on this group where this was
discussed very heavily. Both in the context of remote code updating and
use of bulk data storage. The discussion covered many techniques such as
dtaa integriity, mini file systems etc.
Al
jkw_ee wrote:
>
> I have about 4KB of operational parameters to be stored in non-
> volitile memory but they will be updated occasionally. I have
> experience doing this in EEPROM but this is my first encounter with
> flash. I found the flash routines in the download area but would
> appreciate a chance to talk to anyone who has experience with
> updating and erasing segments in flash. I could use the flash or tag
> on an I2C EEPROM but need to make that decision soon.
>
> Thanks,
> Jeremy
> jweese@jwee...
>
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
Reply by ●November 4, 20042004-11-04
In addition to what others have written, be careful where you write the data into FLASH to be sure it does not conflict with where the compiler puts code. Since you have a lot of data to write, you will not be able to store all of it in info FLASH. You will have to use some of the other 512-byte blocks. Some compilers (like the IAR one I used to use) fill backward from the top of memory, so the lower blocks (just above the information blocks) would be available. But the Rowley compiler seems to load low so you would want to use some upper blocks that do not conflict with vectors. Also, if you are using an 'F149, keep in mind the first block just above Info Segment A is 256 bytes in size - not 512 like they say all non-info blocks are. The remainder of the blocks are indeed 512 bytes each. Lou >I have about 4KB of operational parameters to be stored in non- >volitile memory but they will be updated occasionally. I have >experience doing this in EEPROM but this is my first encounter with >flash. I found the flash routines in the download area but would >appreciate a chance to talk to anyone who has experience with >updating and erasing segments in flash. I could use the flash or tag >on an I2C EEPROM but need to make that decision soon. _________________________________________________________________ Get ready for school! Find articles, homework help and more in the Back to School Guide! http://special.msn.com/network/04backtoschool.armx
Reply by ●November 4, 20042004-11-04
On Fri, Nov 05, 2004 at 01:32:38AM +1030, onestone wrote:
>
> Using flash as a data store is very simple with the MSP430. Flash write
> direct from memory (ie you don't have to move the flash write code to
> RAM) works exceptionally well in my opinion, and is quicker than most
> other devices.
.. and need very little current. 0.3mA approx (much less than any other
flash I have seen).
Matthias
Reply by ●November 6, 20042004-11-06
How I can determine what is the first position in flash to save data, to prevent risk of erase code in flash? Cleber ----- Original Message ----- From: onestone To: msp430@msp4... Sent: Thursday, November 04, 2004 1:02 PM Subject: Re: [msp430] Storing parameters in Flash Using flash as a data store is very simple with the MSP430. Flash write direct from memory (ie you don't have to move the flash write code to RAM) works exceptionally well in my opinion, and is quicker than most other devices. I would steer clear of block writes. these can be unreliable. I would go back through the archives on this group where this was discussed very heavily. Both in the context of remote code updating and use of bulk data storage. The discussion covered many techniques such as dtaa integriity, mini file systems etc. Al jkw_ee wrote: > > I have about 4KB of operational parameters to be stored in non- > volitile memory but they will be updated occasionally. I have > experience doing this in EEPROM but this is my first encounter with > flash. I found the flash routines in the download area but would > appreciate a chance to talk to anyone who has experience with > updating and erasing segments in flash. I could use the flash or tag > on an I2C EEPROM but need to make that decision soon. > > Thanks, > Jeremy > jweese@jwee... > > > > > > > . > > > .
Reply by ●November 6, 20042004-11-06
I use the list file. This shows me all the code, tables etc, and free
spaces. I also place my code where I want it to be, so that I can
control free space. I'm not sure how the various compilers do this. I
use assembler, it makes life so much easier. ;?}
Al
Cleber wrote:
> How I can determine what is the first position in
flash to save data, to prevent risk of erase code in flash?
>
> Cleber
> ----- Original Message -----
> From: onestone
> To: msp430@msp4...
> Sent: Thursday, November 04, 2004 1:02 PM
> Subject: Re: [msp430] Storing parameters in Flash
>
>
> Using flash as a data store is very simple with the MSP430. Flash write
> direct from memory (ie you don't have to move the flash write code
to
> RAM) works exceptionally well in my opinion, and is quicker than most
> other devices. I would steer clear of block writes. these can be
> unreliable.
>
> I would go back through the archives on this group where this was
> discussed very heavily. Both in the context of remote code updating and
> use of bulk data storage. The discussion covered many techniques such as
> dtaa integriity, mini file systems etc.
>
> Al
>
> jkw_ee wrote:
>
> >
> > I have about 4KB of operational parameters to be stored in non-
> > volitile memory but they will be updated occasionally. I have
> > experience doing this in EEPROM but this is my first encounter with
> > flash. I found the flash routines in the download area but would
> > appreciate a chance to talk to anyone who has experience with
> > updating and erasing segments in flash. I could use the flash or tag
> > on an I2C EEPROM but need to make that decision soon.
> >
> > Thanks,
> > Jeremy
> > jweese@jwee...
> >
> >
> >
> >
> >
> >
> > .
> >
> >
> > .
>
>
>
>
>
>
>
>
>
> .
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
Reply by ●November 6, 20042004-11-06
Various C compilers do it in their own way. You can generally look at the map file. You can put your variables to store in flash in a separate C file, and force the loading of that particular constant data segment at the address of your choice, through linker directives. One thing you have to remember is that the flash memory is erased by segments (generally 512 bytes, but sometimes 128, and even 256), so that you have to make sure that none of your code will share a segment with the data zone that you will have to erase and reprogram. Michel --- In msp430@msp4..., onestone <onestone@b...> wrote: > I use the list file. This shows me all the code, tables etc, and free > spaces. I also place my code where I want it to be, so that I can > control free space. I'm not sure how the various compilers do this. I > use assembler, it makes life so much easier. ;?} > > Al > > Cleber wrote: > > > How I can determine what is the first position in flash to save data, to prevent risk of erase code in flash? > > > > Cleber > > ----- Original Message ----- > > From: onestone > > To: msp430@msp4... > > Sent: Thursday, November 04, 2004 1:02 PM > > Subject: Re: [msp430] Storing parameters in Flash > > > > > > Using flash as a data store is very simple with the MSP430. Flash write > > direct from memory (ie you don't have to move the flash write code to > > RAM) works exceptionally well in my opinion, and is quicker than most > > other devices. I would steer clear of block writes. these can be > > unreliable. > > > > I would go back through the archives on this group where this was > > discussed very heavily. Both in the context of remote code updating and > > use of bulk data storage. The discussion covered many techniques such as > > dtaa integriity, mini file systems etc. > > > > Al > > > > jkw_ee wrote: > > > > > > > > I have about 4KB of operational parameters to be stored in non- > > > volitile memory but they will be updated occasionally. I have > > > experience doing this in EEPROM but this is my first encounter with > > > flash. I found the flash routines in the download area but would > > > appreciate a chance to talk to anyone who has experience with > > > updating and erasing segments in flash. I could use the flash or tag > > > on an I2C EEPROM but need to make that decision soon. > > > > > > Thanks, > > > Jeremy > > > jweese@s... > > > > > > > > > > > > > > > > > > > > > . > > > > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > . > > > > > > > > > > Yahoo! Groups Sponsor > > > > Get unlimited calls to > > > > U.S./Canada > > > > > > > > > > ------------------------------ ------------ > > Yahoo! Groups Links > > > > a.. To visit your group on the web, go to: > > http://groups.yahoo.com/group/msp430/ > > > > b.. . > > > > c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. > > > > > > > > > > > > > > > > > > > > . > > > > > > Yahoo! Groups Links > > > > > > > > > > > > > > > >
