Re: [lwip-users] TFTP init

[Stephen Cowell]

Nick... I'm using the same ftp... and the same processor... I wrote sftp 
but it's actually ftpd, from toelke.

Some confusion... your board, your design, is an FTP server?  You are 
pushing files from a PC client to an embedded server.
I'm assuming no OS... raw, in other words.

Do you have the SAM4E-EK?  or the Explained? kit?  Or are you already on 
custom hardware?   Always easiest to start with a kit.

Looking at fatfs's conf_access.h file, I see this entry:

<>

/*! \name Activation of Logical Unit Numbers
 */
//! @{
#ifdef VIRTUAL_MEMORY_ENABLE
#define LUN_0                ENABLE   //!< Enable On-Chip Virtual Memory.
#else
#define LUN_0                DISABLE  //!< Disable On-Chip Virtual Memory.
#endif

</>

.. so it looks like FatFS will do virtual memory.  I don't expect that 
you'll be able to get on-chip flash working easily... this seems more 
designed for RAM.  How big are the files you're moving? You say 
'image'... these are bitmaps, or iso's?  Using on-chip flash is 
complicated.  Use RAM if at all possible.  Open the fatfs docs (you'll 
have to tell AtmelStudio to use a browser, this is silly of course) and 
find the f_mount() function... follow what it does. They have a user forum,

http://elm-chan.org/fsw/ff/bd/

I created an example project for LWIP using the 
THIRDPARTY_RAW_BASIC_HTTP example, then I created other example projects 
for SD Card, then diffed the projects and added the pieces into my first 
project.  Now I have an SD card that is an FTP server with NTP-based 
clock.  It was not easy... use every cheat you can find.  If you have to 
add a USB stick or an SD card to get it going, do so.
__
Steve
.

On 1/18/2017 9:20 AM, nrichard wrote:
> Stephen Cowell wrote
> > What ftp library are you using?  I successfully used sftp with lwip
> > 1.4.1 and fatFS, no OS needed, to be an FTP server for an SD card.
> >
> > Are you being a server or a client?  Sounds like client.  Pretty sure
> > all the ftp things need a file system to work.
> >
> > Using a file system is going to be easier than hacking an FTP client I
> > think.  Your goal is to use as much already-done code as possible.
> > Choose hardware with a rich set of example projects... Atmel SAM4E
> > helped me a lot.
> >
> > --
> > Stephen Cowell
> I'm actually using a SAM4E myself (specifically Sam4e16e).  I'm using this
> library for FTP: https://github.com/toelke/lwip-ftpd
> You are correct, I am the client on my local PC and the board will be the
> server running elsewhere.  I would like to avoid using an SD card and have
> the FTP server transfer to flash memory.  I only need to transfer 2 image
> files to 2 locations in memory, nothing else.
> With the library above, FatFs wants to use up all my memory for some reason,
> so I need to figure out how I can not use up all my memory, or be able to
> modify the vfs files to not use FatFs at all.
>
> -Nick
>
>
>
> --
> View this message in context: 
> http://lwip.100.n7.nabble.com/TFTP-init-tp28231p28409.html
> Sent from the lwip-users mailing list archive at Nabble.com.
>
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