LeafLabs Garden

A place to share, learn, and grow...

1. 

   Wingnut
   Member

   Greetings.

   I'm struggling to build a Windows Flash update utility for the Maple R3 environment...

   My plan is to create a .NET program that can be installed... which will pulse the DTR and put the maple into Bootloader mode... and then launch DFU UTIL in the background to flash software updates to a customer base using the maple board.

   I've been working in .NET to create something that pulses DTR (HI/LOW) and sends the "1EAF" to the device to try to trigger the boatloader... and I can't get a thing out of the board. In fact, when I try to send ANY data to the device (after the DTR pulse), my program just freezes when I try to send my first ASCII character.

   I have verified that the IDE will upload a compiled sketch to the maple board. The IDE successfully pulses DTR, uploads the program, and resets the board... so I know my drivers are all OK, and I know that the hardware configuration is all good... (COM Port, etc).

   I'm just getting tripped up on the Windows implementation of this.

   Has anyone already written a windows program that will do what I'm attempting? Or does anyone have a forehead slapping answer that could help put me on the correct path?

   (thanks in advance)

   Jay

   Posted 3 years ago #
2. 

   Wingnut
   Member

   Ok... after stumbling around a bit, I've gotten a bit further... (I can now send serial data to the Maple (took me a bit to figure out I had to reset the device each time I tried).

   BUT... it's still not responding to DTR pulse or 1EAF Ascii data transmission.

   Is there a delay I should be paying attention to? (Set DTR HIGH for X milliseconds, then LOW for x milliseconds, then send the ASCII data?)

   When the maple goes into "bootloader" mode via software, will it flash the LED the same way as with the button? (So I can at least visually see whether it worked?)

   Jay

   Posted 3 years ago #
3. 

   mbolivar
   LeafLabs

   Is there a delay I should be paying attention to? (Set DTR HIGH for X milliseconds, then LOW for x milliseconds, then send the ASCII data?)

   You could try replicating the timing we use in our reset.py script:
   https://github.com/leaflabs/libmaple/blob/v0.0.12/support/scripts/reset.py#L66

   When the maple goes into "bootloader" mode via software, will it flash the LED the same way as with the button? (So I can at least visually see whether it worked?)

   There's only one way to run the bootloader (resetting the board), and it always behaves the same way, so you'll definitely be able to tell if the bootloader is running.

   The bootloader is just the program that's run on reset, so "going into bootloader mode" is synonymous with "being reset". When the Maple detects the DTR pulse + "1EAF", it just resets itself via SCB_AIRCR.

   Posted 3 years ago #
4. 

   Wingnut
   Member

   Thanks for the post, it helped clarify the steps, but still no-go.

   I've found a work-around by just putting my Windows app into a "scanning" loop, waiting for the selected COM port to disappear during a reset of the controller, then just calling DFU-UTIL to punch up the binary.

   Jay

   Posted 3 years ago #

RSS feed for this topic

Reply

You must log in to post.