Fresh boards, can't flash via DFU

[cnlohr]

I ordered several boards of this variant from JLCPCB. And, they used a STM32F072C8T6 C80488 but it seems the parts don't come from the factory with a USB bootloader for DFU. According to the datasheet, for DFU USB should be on PB6/7 instead of PA11/12.

What is the actual procedure for getting an appropriate bootloader onto the STM32F072C8T6, or mechanism to use other programmer?

I have an ST-Link programmer, which is OpenOCD compatible, but I don't see any indication how to use the SWD programming with this part. What is the recommended path forward?

[cnlohr]

Using st-flash succeeds but the part remains dysfunctional :(

st-flash write EASYPDKPROG.bin 0x08000000
st-flash 1.6.0
2023-07-05T16:11:19 INFO usb.c: -- exit_dfu_mode
2023-07-05T16:11:19 INFO common.c: Loading device parameters....
2023-07-05T16:11:19 INFO common.c: Device connected is: F07x device, id 0x20016448
2023-07-05T16:11:19 INFO common.c: SRAM size: 0x4000 bytes (16 KiB), Flash: 0x10000 bytes (64 KiB) in pages of 2048 bytes
2023-07-05T16:11:19 INFO common.c: Attempting to write 35108 (0x8924) bytes to stm32 address: 134217728 (0x8000000)
Flash page at addr: 0x08008800 erased
2023-07-05T16:11:19 INFO common.c: Finished erasing 18 pages of 2048 (0x800) bytes
2023-07-05T16:11:19 INFO common.c: Starting Flash write for VL/F0/F3/F1_XL core id
2023-07-05T16:11:19 INFO flash_loader.c: Successfully loaded flash loader in sram
 18/18 pages written
2023-07-05T16:11:21 INFO common.c: Starting verification of write complete
2023-07-05T16:11:21 INFO common.c: Flash written and verified! jolly good!

[20309.056409] usb 1-3: new low-speed USB device number 31 using xhci_hcd
[20309.184423] usb 1-3: device descriptor read/64, error -71
[20309.424377] usb 1-3: device descriptor read/64, error -71
[20309.664411] usb 1-3: new low-speed USB device number 32 using xhci_hcd
[20309.792386] usb 1-3: device descriptor read/64, error -71
[20310.028388] usb 1-3: device descriptor read/64, error -71
[20310.140432] usb usb1-port3: attempt power cycle
[20310.556408] usb 1-3: new low-speed USB device number 33 using xhci_hcd
[20310.556930] usb 1-3: Device not responding to setup address.
[20310.764895] usb 1-3: Device not responding to setup address.
[20310.972389] usb 1-3: device not accepting address 33, error -71
[20311.100448] usb 1-3: new low-speed USB device number 34 using xhci_hcd
[20311.100937] usb 1-3: Device not responding to setup address.
[20311.308932] usb 1-3: Device not responding to setup address.
[20311.520396] usb 1-3: device not accepting address 34, error -71
[20311.520447] usb usb1-port3: unable to enumerate USB device

[cnlohr]

All boards have the same issue, all flash fine, all report low speed device. Are there any extra fuses or anything that need to be set beforehand?

[cnlohr]

I am using the variant from thomasesr. https://github.com/thomasesr/easy-pdk-programmer-hardware which has flipped D+/D- it seems. I wish I could open an issue to warn others.

But even when flipping them, the part does not appear to come online.

[cnlohr]

Aah! That was it. Just flipped D+/D- on Thomasesr's version.