Running the device from a bench top power supply still yeilds no fix I have since bodged in an alternative power supply as attached below Scoping 3v3 shows no issues As I said in an earlier post, replacing the microcontroller fixed the issue We still have 4x boards that have not powered up as yet an...

I have measured GPIO 2 and found it to be low (but it may come to bite us later if the microcontroller boots during CANRX) GPIO 8 is an output with a 10k pull down The power supply is a simple LDO I have scoped this rail and there is no oddities Note there is substantially more capacitance on the ra...

That was a mistake on my part with that board however I have attempted to put it in bootloader mode using IO9 This did not fix the issue, although it did behave differently in device manager Another board (attached schematic) also has the same issues I am certain there is some form of hardware issue...

The boot pin is definitely in the wrong location however I have experimented a significant amount with getting the actual boot pin (9) low to get into bootloader mode It does show up as a different device on device manager (I think) however it will not take a flash. There is another PCB we made that...

Hi all, We have designed a few PCB's recently using Easy Eda. We typically get the board manufactured and pick and placed at JLCPCB (They use LCSC stock for the PNP) I was unable to flash the microcontroller over USB like I would normally be able to so I went through a great troubleshooting list as ...