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mpremote: fix esp usb reset #17776

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Merged
merged 1 commit into from
Aug 1, 2025
+6 −1
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mpremote: fix esp usb reset #17776

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7 changes: 6 additions & 1 deletion tools/mpremote/mpremote/transport_serial.py
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Original file line number Diff line number Diff line change
Expand Up @@ -40,6 +40,8 @@
from .console import VT_ENABLED
from .transport import TransportError, TransportExecError, Transport

VID_ESPRESSIF = 0x303A # Espressif Incorporated


class SerialTransport(Transport):
fs_hook_mount = "/remote" # MUST match the mount point in fs_hook_code
Expand Down Expand Up @@ -71,7 +73,10 @@ def __init__(self, device, baudrate=115200, wait=0, exclusive=True, timeout=None
self.serial = serial.Serial(**serial_kwargs)
self.serial.port = device
portinfo = list(serial.tools.list_ports.grep(device)) # type: ignore
if portinfo and portinfo[0].manufacturer != "Microsoft":
if portinfo and (
getattr(portinfo[0], "vid", 0) == VID_ESPRESSIF
or getattr(portinfo[0], "manufacturer", "") != "Microsoft"
):
# ESP8266/ESP32 boards use RTS/CTS for flashing and boot mode selection.
# DTR False: to avoid using the reset button will hang the MCU in bootloader mode
# RTS False: to prevent pulses on rts on serial.close() that would POWERON_RESET an ESPxx
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