I don't see anything that looks bridged. It appears to be a clone of a clone as it is missing some labeling that the original and the older clones used to have.
It is interesting that VK3HAW has the same problem and both of you are using RPi 4's. I noticed that Andy created a script that runs during the boot process that is supposed to reset the hat if it detects a RPi 4. I would expect that to be working when you boot but maybe it isn't for some reason.
Heres two things I would try:
Get it to the condition where the SVC LED is not blinking slowly and run this:
Code: Select all
Another thing I would try is to remove the hat, and boot the RPi and then carefully push the hat on enough to for all the pins to make contact and see if the hat initializes properly. My thinking there is since Andy wrote the reset scripting maybe the RPi 4 GPIO is in a weird state on first powerup where its enough to trick the STM32 into thinking it should be in bootloader mode. The STM32 would initialize much faster than the RPi GPIO would.
I don't have a RPi 4, but it would be interesting to maybe put it on a scope and see what the GPIO pins are doing on first powerup.