Hi, i’ve been trying with sipeed-rv-debugger to upload compiled object in VS Code without my luck.
I got no issue with USB dfu method, but this FT2232 adapter yielded only “Error: JTAG scan chain interrogation failed: all ones”
Win 7 64bit + VS Code 1.39.2 + PIO 1.9.3
I saw “Dual RS232” in my Device Manager, and applied WinUSB with Zadig, so the adapter has been recognized.
The error suggested connection issue. I connected TDI/TMS/TDO/TCK/GND from adapter to the board (TDI & TDO were crossed). I connected USB cable to the board to supply power.
I also tried with RST of the adapter connected/not connected to RST of the board, which didn’t make any difference.
I believe this Sipeed branded adapter should work with Longan nano.
Any suggestion would be appreciated.