Any plans to add support for picorvd?

[Plaque-fcc]

I'm currently using picorvd as my main and only programmer hardware for programming some CH32V003 boards.
It is based on a Raspberry Pi Pico (RP2040) board and implements an SWD link. I can upload firmwares using GDB and this programmer, but it would probably be also nice to be able to config fuses, I guess.

What do you think?

[dwillmore]

I'm not sure what you mean by fuses. Unlike the AVR chips, all parts of flash can be programmed without special methods. The user code can program the 'option bytes' which govern a few chip level properties. Please see the example program: https://github.com/cnlohr/ch32v003fun/blob/master/examples/flashtest/flashtest.c

[Plaque-fcc]

Oh, that helped. Yes, I was talking about the option bytes Thanks!

[Plaque-fcc]

I happen to have an ESP32 S2 Mini board, it turns out. so I etched myself a shield to use it as a esp32s2-funprog tool.
Turns out, this won't help me:

$ ../../ch32fun/../minichlink/minichlink -D
Found ESP32S2-Style Programmer
Interface Setup
Error: DefaultConfigureNRSTAsGPIO does not work via the programmer here.  Please see the demo "optionbytes"

So I compiled the optionbytes example choosing uint16_t OB_RST = OB_RST_NoEN;, flashing it and letting the chip boot up and do the configuration.

So thank you @dwillmore for the advice, and thank you the one who added this hint into minichlink tool of this project (likely @cnlohr).

I wonder whether we could be able to configure it in less steps maybe. Just curious.

[monte-monte]

You can set option bytes by writing the directly with minichlink:
minichlink -w +nUSER|USER 0x1FFFF802
USER is user byte which contains setting for PD7 Reset behavior (look in the reference manual)
nUSER - inverse USER byte.

[cnlohr]

I would love to support picorvd, but, it's very squarely centered around just being a GDB backend. That said, it wouldn't be too hard to port the bitbang rvswdio library to support SWD and SWIO both, https://github.com/cnlohr/rv003usb/blob/master/testing/rvswdio_programmer/bitbang_rvswdio.h

But, I am just not into the rp2040 myself.