Thank you for your replies!!
I took photos of every pin on the flash chip during boot and flash. I noticed that it now doesn't matter whether or not I press the BOOT button or not, the bootloader always goes into USB mode.
CS Boot
![Image]()
CS Flash
![Image]()
CLK Boot
![Image]()
CLK Flash
![Image]()
IO1 Boot
![Image]()
IO1 Flash
![Image]()
I didn't take photos of IO2 and IO3 since I assumed they would be similar enough to IO1.
About PCB layout: would love to hear more suggestions about grounding! I'm quite a novice when it comes to PCB design (obviously...), so I really want to hear every suggestion you have to improve.
I took photos of every pin on the flash chip during boot and flash. I noticed that it now doesn't matter whether or not I press the BOOT button or not, the bootloader always goes into USB mode.
CS Boot
CS Flash
CLK Boot
CLK Flash
IO1 Boot
IO1 Flash
I didn't take photos of IO2 and IO3 since I assumed they would be similar enough to IO1.
About PCB layout: would love to hear more suggestions about grounding! I'm quite a novice when it comes to PCB design (obviously...), so I really want to hear every suggestion you have to improve.
Statistics: Posted by VE3SVF — Sun Mar 30, 2025 11:03 pm