About DJC

DJC · 2022-03-07

Say, I have a STM32L431RB (128k,64k) on a board design. This is the lowest flash size on the 6 chips on the STM32L4x1Rx 64pin variety. It certainty looks like I can drop-in any of the larger flash/ram chips as the pin outs all look the same. But do I...

DJC · 2021-09-20

In AN4899 it specifies that one should add a zener diode from the 5V rail to the 3.3V rail in order to have complete safety when using FT pins with 5V pull ups. Does anyone know what the specifications of the Zener diode should be (currents, resistan...

DJC · 2021-09-10

SummaryAt the end of the day, my issue is missing something in documentation. The lesson here, is test thoroughly. Just because it works for a few minutes, doesn't mean forever. Anyway, I've been running >3mA through the pins that are limited before ...

DJC · 2021-09-07

See the image. I can't figure out how I have done this, but my source folders appear like this, rather than in a hierarchy. When I open the folders in explorer, they are all nested as you would expect, folders inside folders. They are not folders wit...

DJC · 2021-09-02

Does anyone have experience with 5V pull ups? do you have to power on the 5V source after the MCU is started?I'm running a STM32L431CBT6 with external 5 volt 10k pull-ups on the pins PB11,12,13,14,15 and PA1. (all flagged as FT pins)I've been able t...

DJC · 2022-09-14

I think he means this link. https://stackoverflow.com/questions/3657054/eclipse-freezing-at-startup-before-loading-workspaceIn which case, says just delete the file [Workspace Directory]/.metadata/.plugins/org.eclipse.core.resources/.snapI has a pret...

DJC · 2022-03-07

Sorry, I don't understand what you mean by "die" and "tested flash size". (looking up "MCU DIE", brings up lots of Marvel stuff  )Until now, I was under the impression that one builds firmware for a specific target and its pretty much assumed that t...

DJC · 2021-09-21

Thanks. I find it really curious about this document is that this is done on I2C. I2C is bi-directional and therefor there will be times when (at least) SDA needs to be configured as output with open drain. However there are SO many places where peop...

DJC · 2021-09-21

I think that, based on you comments and my ongoing investigations this FT pin stuff was not an issue. I have also since not be able to replicate it. Thanks for all your help. Further to this case, I was also looking using a Zener diode to further pro...

DJC · 2021-09-07

Pin configurations are described in the original question. As far as i know, open drain is what is needed to operate a 5vt pin. However, it should also work in reset_state as this equates to an open circuit.would be good to know where you are going w...

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Code changes needed for drop in replacement of MCU's with more flash

Zener Diode from 5V rail to VDD across the LDO?

Don't drive LEDs from these pins. "PC13, PC14 and PC15 are supplied through the power switch". What does this power switch really do?

CubeIDE strange presentation of nested folder structure.

Powering up a 5 volt tolerant external pull up.

Re: CubeIDE is not opening.

Re: Code changes needed for drop in replacement of MCU's with more flash

Re: Zener Diode from 5V rail to VDD across the LDO?

Re: Powering up a 5 volt tolerant external pull up.

Re: Powering up a 5 volt tolerant external pull up.