Auto reset on DTR

[GGORG0]

Hi, I'd like to make use of the automatic reset on DTR line feature found on Arduinos.
Essentially, if you connect via serial, upon opening the connection the DTR line will pulse and the ATMega will be reset.
Is there an equivalent feature for the rp2040? Is it possible to implement it on my own, for example by attaching an interrupt to the virtual DTR pin (i know that the rp2040 uses USB-CDC for its serial connection)

If that's not possible, then is there an easy way to reset the rp2040 using the serial connection, without just sending a special packet interpreted by the program over the data lines?

[earlephilhower]

It's already there for USB, see:

arduino-pico/cores/rp2040/SerialUSB.cpp

Lines 182 to 221 in bc7adf4

	static void CheckSerialReset() {
	if (!_rebooting && (_bps == 1200) && (!_dtr)) {
	if (__isFreeRTOS) {
	__freertos_idle_other_core();
	}
	_rebooting = true;
	// Disable NVIC IRQ, so that we don't get bothered anymore
	irq_set_enabled(USBCTRL_IRQ, false);
	// Reset the whole USB hardware block
	reset_block(RESETS_RESET_USBCTRL_BITS);
	unreset_block(RESETS_RESET_USBCTRL_BITS);
	// Delay a bit, so the PC can figure out that we have disconnected.
	busy_wait_ms(3);
	reset_usb_boot(0, 0);
	while (1); // WDT will fire here
	}
	}
	bool SerialUSB::dtr() {
	return _dtr;
	}
	bool SerialUSB::rts() {
	return _rts;
	}
	extern "C" void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts) {
	(void) itf;
	_dtr = dtr ? true : false;
	_rts = rts ? true : false;
	CheckSerialReset();
	}
	extern "C" void tud_cdc_line_coding_cb(uint8_t itf, cdc_line_coding_t const* p_line_coding) {
	(void) itf;
	_bps = p_line_coding->bit_rate;
	CheckSerialReset();
	}
	SerialUSB Serial;