[Be]

Is there any way to access the ESP32's JTAG interface over USB, or could there be with changes to the SAMD21 firmware? I was hoping to use probe.rs with my Tangara, but probe-rs doesn't detect it. I know the documentation says you can disassemble the Tangara and solder wires to the JTAG pins, but that's much more cumbersome than plugging in a USB cable. Is it still feasible to close the case if wires are soldered to the JTAG pins?

[Be]

I figured out that I could log info over UART in Rust by using the "println" Cargo feature of esp-backtrace, using the "uart" and "log" Cargo features of esp-println, calling esp_println::logger::init_logger_from_env() at the beginning of main, and putting

[target.xtensa-esp32-none-elf]
runner = "espflash flash --monitor"

[env]
ESP_LOG="INFO"

in cargo/config.toml.

This isn't as pretty or performant as defmt over JTAG with probe-rs, but it works.