[Ovmsdev] Flash memory and developement setup

[Michael Balzer]

Eddy,

note that Fabrizio works on porting the OVMS to ESP-IDF 4:

https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/issues/263#issuecomment-606132473

Maybe you can join forces?

Regards,
Michael


Am 08.04.20 um 04:05 schrieb Mark Webb-Johnson:
>
>> Am I correct to assume that the 16Mb of memory is on the  module now?
>
> The ESP32 chip uses an external flash chip. The WROOM/WROVER modules include a flash chip in the modules.
>
> In the very early days of development prototypes for OVMS v3, we used an external 16MB flash chip (as only 4MB WROOM modules were available at the time).
>
> For production, we switched to 16MB WROVER modules, so don’t require any external flash chip any more.
>
>> How are the core developers dealing with this slowness?
>
> I don’t find it slow at all (but I use MAC and LINUX for development). Most of the time, it is an incremental build (only building changes code, and then a
> linking step) - it normally takes longer to flash the chip than build the code. I timed a full ‘make clean; make -j 4’ to see what it is for me:
>
>     $ time make -j 4
>     ...
>     real2m53.557s
>     user5m55.978s
>     sys1m40.391s
>
>
> Just under 3 minutes real time. Perhaps you can check in windows to see how much worse it is?
>
>> Is it at all possible, if i could force platformio to use the correct the idf-esp libraries, to compile the OVMS code in a  more recent environment that uses
>> cmake and ninja?
>
> I haven’t tried it myself. We do have some make scripts in various components that may rely on the existing build system. Things like the versioning.
>
> OVMS was written when ESP-IDF was quite new, and unpolished. At some point, we will most likely migrate to a newer build system, as ESP-IDF matures.
>
> Regards, Mark.
>
>> On 8 Apr 2020, at 8:37 AM, Eddy Vromen <eddy_vromen at hotmail.com <mailto:eddy_vromen at hotmail.com>> wrote:
>>
>>
>>
>>
>> HI All,
>>
>> I have a question about the flash memory of the ESP32.
>> I read that the ESP32 uses 16Mb of external flash memory and in the schematics on page 27 there is a flash memory chip. However, in the latest v3.2
>> schematics there is no external flash chip.
>> Am I correct to assume that the 16Mb of memory is on the  module now?
>> How does this impact the e-fuse settings?
>>
>>
>>
>> Another question that came up while setting up a development environment:
>> The version of esp-idf thats used by the OVSM project uses the Mingw32  environment. Based on my limited exposure to using this environment, its very slow
>> compared to compiling esp-idf code under e.g. platformio under VSCode. 
>> How are the core developers dealing with this slowness?
>> Is it at all possible, if i could force platformio to use the correct the idf-esp libraries, to compile the OVMS code in a  more recent environment that uses
>> cmake and ninja?
>>
>>
>>
>> Thanks,
>> Eddy
>>
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>
>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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