The F4 flash is organised into sectors,
small, medium, large
the small sectors are organised into small pages, can be erased on their
own while the micro is running, and are useful in conjunction with a
wear levelling algorthm for NV memory, I describe below.
I would suggest say choosing a small sector/page for NV.
if you need 64 bytes, use an area of say 4kbytes and store your data in
consecutive 128 byte lumps.
IE
erase the whole lot
when you need to write settings, write your 64 bytes.
when you need to write again, write into the next 64 bytes
when you need to write again, write into the next 64 bytes
and so on
when you run out of 64 byte chunks (IE you reach the end of the page or
the sector) and THEN do you trigger a page or sector erase
this minimises flash wear.
for reading, the software just reads the chunks up to where it finds
erased (0xff) cells , it knows which is most recent
or you can compute a CRC for each say 60 bytes in the top 4 bytes of
the 64 bytes. if it fails crc check, it is probably an unused block (or
a bad block where if it is your block you need to read then you'd read
out of main flash defaults and write them in)
On 10/03/2018 8:31 AM, David Rowe wrote:
The EEPROM is not used - plenty of storage on board the stm32f4. Not
sure how much memory is being used at run time, but its usually pretty
tight. Less than half the flash is being used I think.
- David
On 10/03/18 02:11, Jacob Falzon wrote:
Thanks!
If you don't mind, I would also like to ask you regarding the EEPROM.
Is it currently being used by the board or is it also implemented for
expansion purposes? I thought it might have been used for storing
prefences to be loaded but apparently from the comments its eems to
be done from Flash rather than the external EEPROM.
If it is used was it implemented because of a lack of on-board memory
on the STM32F4? Might you know how much memory is consumed as the
SM1000 is running and how I could verify it?
Kindest regards and sorry for any bother.
On Wed, Mar 7, 2018 at 9:43 PM, David Rowe <da...@rowetel.com
<mailto:da...@rowetel.com>> wrote:
Hi Jacob,
1/ Test is an unused feature at present, you can treat it like a
GPIO
2/ We use an opto-isolator so we don't have to provide a switch to
the external radios PTT circuit. An electro-mechanical relay would
have been an alternative. It's usually a mechanical switch on your
PTT mic.
- David
On 08/03/18 00:22, Jacob Falzon wrote:
Hello again,
there are another two pins for the SM1000 that I wanted to know
more about.
The Test pin connects to a Self-Test circuit. What exactly is
this used to test for please?
Also there is another pin named CPPT that connects to an
optoisolator. I understand that the CPPT signal is used to
trigger the PTT for the radio but why is the opto-isolator
implemented please?
Thank you very much for your attention.
Kindest regards,
On Sat, Feb 24, 2018 at 9:01 PM, Jacob Falzon
<jacobfalzon2...@gmail.com <mailto:jacobfalzon2...@gmail.com>
<mailto:jacobfalzon2...@gmail.com
<mailto:jacobfalzon2...@gmail.com>>> wrote:
Thank you very much for your attention.
Have a good night!
On 24 Feb 2018 8:26 PM, "David Rowe" <da...@rowetel.com
<mailto:da...@rowetel.com>
<mailto:da...@rowetel.com <mailto:da...@rowetel.com>>>
wrote:
Hi Jacob,
These pins are just broken out as GPIOs or for future
expansion.
- David
On 25/02/18 00:54, Jacob Falzon wrote:
Hi there,
i was looking at the schematic and I came upon the
SPI pins
and the UART pins in the schematic.
The SPI pins ( SCK, MOSI, MISO, NSS) do not seem
to be
connected with an external component. What is their
purpose?
Also the UART pins whilst available are they
currently
utilised for some purpose?
Many thanks for your kind attention.
Regards,
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the
world's most
engaging tech sites, Slashdot.org!
http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
<mailto:Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>>
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the
world's most
engaging tech sites, Slashdot.org!
http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
<mailto:Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>>
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
<mailto:Freetel-codec2@lists.sourceforge.net>
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
<https://lists.sourceforge.net/lists/listinfo/freetel-codec2>
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Freetel-codec2 mailing list
Freetel-codec2@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/freetel-codec2
