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Re: Simple filesystem for embedded platform

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Il 01/02/2018 10:00, David Brown ha scritto:
> On 01/02/18 09:39, pozz wrote:
>> I'm using lwip that runs httpd over LPC1769 MCU.  Now the filesystem for
>> httpd can't fit the internal Flash memory anymore.  So I'm going to use
>> an external SPI Flash memory.
>>
>> I need some suggestions about a filesystem to use.  I need:
>>
>> - a tool that creates a binary (or Intel HEX) image from a folder on my
>>    Windows development machine (the image will be downloaded to Flash);
>> - file management functions (open, close, read);
>> - simple integration with lwip httpd;
>>
>> I don't need to change the filesystem, so a read-only filesystem is enough.
> 
> Do you really need open, close and read functions?  All you actually
> need is to copy a block of SPI memory into ram.  That might simplify
> things a bit.

Yes, you're right. open/close here can be avoided.  read is a must (your 
copy from SPI to memory RAM is a *read*).


> Does your filesystem need to be independent of the main program?  Your
> filesystem tool could read through the files in a directory, concatenate
> them together into a single binary file, and generate a C header with
> something like:
> 
> enum {
> 	start_index_html = 0, length_index_html = 4040,
> 	start_favicon_ico = 4040, length_favicon_ico = 840,
> 	start_node_js = 4880, length_node_js = 10391,
> 	...
> };
> 
> If that is enough, then your "tool" could be done as a bash script if
> you wanted (I'd use Python myself).

I can't understand. Suppose you need to open the URI "/index.html". How 
to search for this filename in your enum list?


> It will be a little more work if you want to track filenames as well,
> rather than having them fixed in the code, but you could generate a
> table of indexes, lengths, and names.  It is easier if that part can be
> linked directly in the C code, but it would be possible to have it at
> the start of the binary blob for the SPI.

I know I can write something from zero, but I'm sure something already 
written that can be reused.

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Thread

Simple filesystem for embedded platform pozz <pozzugno@gmail.com> - 2018-02-01 09:39 +0100
  Re: Simple filesystem for embedded platform David Brown <david.brown@hesbynett.no> - 2018-02-01 10:00 +0100
    Re: Simple filesystem for embedded platform pozz <pozzugno@gmail.com> - 2018-02-01 12:04 +0100
      Re: Simple filesystem for embedded platform David Brown <david.brown@hesbynett.no> - 2018-02-01 12:21 +0100
        Re: Simple filesystem for embedded platform pozz <pozzugno@gmail.com> - 2018-02-02 13:22 +0100
          Re: Simple filesystem for embedded platform David Brown <david.brown@hesbynett.no> - 2018-02-02 14:43 +0100
          Re: Simple filesystem for embedded platform Stefan Reuther <stefan.news@arcor.de> - 2018-02-02 19:08 +0100
  Re: Simple filesystem for embedded platform pippo2@disney.com (Jack) - 2018-02-01 21:58 +0100
    Re: Simple filesystem for embedded platform Dave Nadler <drn@nadler.com> - 2018-02-01 18:18 -0800
  Re: Simple filesystem for embedded platform Joe Chisolm <jchisolm6@earthlink.net> - 2018-02-01 17:25 -0600

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