Going back to electronic after a 20 years break

 It is painful, but it is beginning to work : On the picture a RP2040-pico zero running lnBMP and happily debugging a ch32v307 Riscv chip (of course it can still debug Arm chips) Perigoso did a lot of work there, only the communication protocol /implementation was missing. It is still a bit slow though :(

Edit: There is a much simpler way. Press the Key Button will connecting the USB-C , it will switch between ARM & RISCV I recently bought the WeAct WCHLINK-W, a small dap style debugger  (both USB & BT)   At first it is configured in Arm/SWD mode and is being listed as  1a86:8012 QinHeng Electronics  by lsusb. On linux, the simpler way to switch it to RiscV mode is to download mountriver community  Then go to Flash->Configuration Click Query on the "Target Mode" line. It should be detected as WCH DapLink Switch it to "WCH Link RV", click apply , wait 2 seconds and done! The id of the device has changed and now lsusb should report 1a86:8010 QinHeng Electronics