joric
commented
3 years ago - New unflashed chip does not work with USB, because well, there's no firmware.
- Bootloader has been flashed correctly, according to the Big Picture, so normally it pops up USB drive right away.
- I don't have methodology for checking out badly soldered USB connector. Just check that all USB pins are soldered. That includes VBUS, CC1, CC2, and D+ D- pins, they all should go where they belong and should not be shorted to each other.
Hi, it is me again). It have a similiar symptoms, but I gathered more details, I can augment #37 if it necessary. I've got Bluepill from Aliexpress and it have CKS32F103C8T6 chip. I've used UART module with STM32 Flash loader demonstrator to upgrade it.
I've checked nrfMicro according to the method described in wiki Testing and I've got 3.3V on VCC, 4.2V between B- and B+, ~5.2V on USB-C power pin, and have voltage drop 0.6-1.1V on almost all pads. Voltage drop also exist 0.6-1.1V between B- and E73 backpads and soldered components (except cases when some of them have direct/short connection like antenna or E73 shield), but couple resistors shows, I think, off scale values (may be it is the cause). Red LED is glowing when I plug nrfMicro to USB port. After soldering nrfMicro doesn't recognizable via USB - is it correct?
I tried to flash E73 on linux and here is what I have:
1) So is there any advice of what I can check additionally or what should I do? 2) May be I should find Bluepill with STM... chip instead of CKS...? 3) Do you have a some reference map, so I could check drop of voltage between all solder contacts/fields? 4) Is unlocking and flashing of E73 completed successfully?