Hi again,
thanks for all your help.
I had a question regarding the power connections for the stm32.
Not all the VDD and VSS pins of the F4 are connected externally together.
Is there a reason for that?
On Tue, Mar 13, 2018 at 3:48 PM, Danilo Beuche <[email protected]>
wrote:
> Hi,
>
>
> fyi: storing configuration data in stm32f4 flash is already being
> supported by stm32f4_vrom.c/.h in the sm1000 code.
>
>
> Regards,
> Danilo
>
> On 13.03.2018 13:56, Andy Wood wrote:
>
> www.st.com/resource/en/application_note/dm00036065.pdf
>
>
> Application note for using flash as emulated eeprom.
>
>
> ------------------------------
> *From:* Jacob Falzon <[email protected]>
> <[email protected]>
> *Sent:* 13 March 2018 12:48
> *To:* [email protected]
> *Subject:* Re: [Freetel-codec2] UART, SPI Pins on SM1000
>
> Thanks a lot for the help.
>
> I'll be sure to take a look at it.
>
> I was afraid that the system was going to run out of memory if I expanded
> on the program.
>
> Ran into something else I couldn't understand on the schematic.
>
> Not all the VDD and VSS pins of the F4 are connected externally together.
> Is there a reason for that?
>
>
> On Fri, Mar 9, 2018 at 10:43 PM, glen english <[email protected]>
> wrote:
>
> 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 <[email protected] <mailto:
> [email protected]>> 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
> <[email protected] <mailto:[email protected]>
> <mailto:[email protected]
> <mailto:[email protected]>>> wrote:
>
> Thank you very much for your attention.
>
> Have a good night!
>
> On 24 Feb 2018 8:26 PM, "David Rowe" <[email protected]
> <mailto:[email protected]>
> <mailto:[email protected] <mailto:[email protected]>>> 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,
>
>
>
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