RTOS: TI RTOS HTTP Server | Post File Example

Daniel Vamos

Tool/software: TI-RTOS

Dear Support Team,

I would like to upload a file (*.txt) to an HTTP sever. Do you have any preferred method for this purpose?

Right now I am using this:

<!DOCTYPE html>
<html lang="en">
   <body>
	<form enctype="multipart/form-data" method="POST" name="fileinfo" action="192.168.1.65/file.cgi">
	  <label>File to stash:</label>
	  <input type="file" name="file" required />
	  <input type="submit" value="Stash the file!" />
	</form>
   </body>
</html>

But the "cgiParseVars()" function can not process the 'name=file' argument well. If I remove the ectype, i got the "file" arg back, but the file content is missing.

Any idea? or suggestion?

over 5 years ago

0 ToddMullanix over 5 years ago

TI__Guru* 96960 points

H Daniel,

Someone will look at this Monday, but in the meantime, can you confirm which version of TI-RTOS you are using.

Thanks,
Todd

0 Daniel Vamos over 5 years ago in reply to ToddMullanix

Genius 3950 points

Thank you for your reply. I am using: 2.16.0.08

0 Gerardo Gomez Martinez over 5 years ago in reply to Daniel Vamos

TI__Expert 5825 points

Hi Daniel,

How big is the file you want to upload?

Thanks,
Gerardo

0 Daniel Vamos over 5 years ago in reply to Gerardo Gomez Martinez

Genius 3950 points

Hello Gerardo,

Just a few KB. The whole file should be placed into a malloc location.

0 Gerardo Gomez Martinez over 5 years ago in reply to Daniel Vamos

TI__Expert 5825 points

Daniel,

Here's the source for an example with a web server on it and a HTML form which shows how to upload a text file, this shows how it should be done. client.zip

Hope that helps,
Gerardo

0 Daniel Vamos over 5 years ago in reply to Gerardo Gomez Martinez

Genius 3950 points

Hello,

Thank you for your help! Now I can see I that the cgiparsem.h is used to upload the file. With TM4C129 I don't have this library but I am going to grab it from the Simplelink. If I need more help, I will let you know!

0 Daniel Vamos over 5 years ago in reply to Gerardo Gomez Martinez

Genius 3950 points

one more question.... if this solution exists, do you event plan to implement firmware upgrade such a file upload like this example?

0 Gerardo Gomez Martinez over 5 years ago in reply to Daniel Vamos

TI__Expert 5825 points

Hi Daniel,

Can you elaborate on your question? I'm not sure I'm understanding what you're asking.

Thanks,
Gerardo

0 Daniel Vamos over 5 years ago in reply to Gerardo Gomez Martinez

Genius 3950 points

Hello,

I am thinking of the TFTP-based firmware update for the TM4C family. I am sure that you know about the BOOTP - TFTP flasing procedure that exists for the TM4C and the MSP432 families to update the user application fot the device. If a user can upload the firmware *.bin file like this way that you presented in your example (multipart/form-data) that could be awesome and more user friendly.

What do you think? Are you planning to implement such a method for flashing?

(should I open a new thread for this question?)

0 Peter Borenstein over 5 years ago in reply to Daniel Vamos

Mastermind 8695 points

Using a web page to upload firmware seems nice and user friendly.

Are you suggesting the bootloader host the website that receives the .bin file? As it stands, the bootloader implements minimal features of TCP/IP to keep itself small. Hosting a web page would be a significant change.

Alternatively, the application to host the website, then call the bootloader after stashing the .bin file in flash. The bootloader could check the CRC of wherever you placed the .bin and coping it to APP_BASE. Or perhapse the bootloader could set VTABLE, SP, and the PC to run the downloaded image right where it is. This changes two principles of the bootloader.

First, the bootloader runs from SRAM for modification of flash. Section 8.2.3.10 of the TM4C datasheet says "If instruction execution is required during a Flash memory operation, the code that is executing must be placed in SRAM". I think this is applies only to flash code in the 16kB region being erased or written. If this is true and you are downloading to a buffer, this point is moot, because you would not be modifying the flash you are executing.

Second, the flash bootloader expects to receive/download the .bin file. This saves the space of some reserved flash buffer the app code would download the .bin file to. there is no need for a reserved buffer if you download directly to APP_BASE.

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RTOS: TI RTOS HTTP Server | Post File Example