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1. 

   trunet
   Member

   Reading thru datasheet it seems that this uC's are pin compatible with some minor modifications on power pins.

   Any of you already tried to change the uC? Is it possible?

   Posted 3 years ago #
2. 

   Cyclegadget
   Member

   You have to read around to find it but, a few people have designed their own boards using the newer chips. In this link their is some open hardware although I don't think it is the chip you are looking for.
   https://github.com/gbulmer/

   Posted 3 years ago #
3. 

   crenn
   Moderator

   The problem isn't so much the pin compatibility, but the lack of a LQFP-48 package in the STM32F4 line.

   Posted 3 years ago #
4. 

   Rod
   Member

   I have a 0.7" wide Maple Mini board I have successfully loaded code into. It has a 64 pin chip layout and I've installed an F1 series chip in it at the moment, but is laid out to take F4 and L1 series as well. It's pin compatible with the Maple Mini (except for the 32 kHz crystal pins which I've diverted to an on-board crystal). (Pin compatible means you should have a socket row at both 0.6" and 0.7" on the right side that are connected together.)

   Also has on-board 64 Mbyte flash for data-logging, and of course it will take the STM32103RG chip that already has a meg of flash and 96K of RAM on-board.

   The plan was to provide an evolutionary path that could start with relatively well known F1 software and provide a path to F4 and L1 upgrades to projects using the Maple Mini.

   I'm planning to use it as the core of multiple projects myself.

   I'd be glad to have help with the effort. I was holding off on a further upload until it was more thoroughly debugged.

   Initial layout is at github.com/openstm32. (BTW I made gbulmer an administrator on that site and thought I should make Siy and bubulindo admin's as well. Seems like it would be a good thing to have a central repository with active admin's to keep it current.)

   Posted 3 years ago #
5. 

   gbulmer
   Moderator

   trunet - you could buy a Maple Mini size board with an STM32F4 from http://www.ghielectronics.com/catalog/product/353

   If you want to make your own, the Open Source Eagle PCB CAD is mentioned on page
   http://wiki.tinyclr.com/index.php?title=FEZ_Cerberus_Developer
   and is currently at
   http://www.ghielectronics.com/downloads/Gadgeteer/Mainboard/Cerberus/EAGLE%20FEZ%20Cerb40.zip

   Posted 3 years ago #

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