esp-idf/tools/idf_monitor_base/serial_reader.py

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# SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
# SPDX-License-Identifier: Apache-2.0
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import queue
import subprocess
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import sys
import time
import serial
from .constants import CHECK_ALIVE_FLAG_TIMEOUT, MINIMAL_EN_LOW_DELAY, RECONNECT_DELAY, TAG_SERIAL
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from .output_helpers import red_print, yellow_print
from .stoppable_thread import StoppableThread
class Reader(StoppableThread):
""" Output Reader base class """
class SerialReader(Reader):
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""" Read serial data from the serial port and push to the
event queue, until stopped.
"""
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def __init__(self, serial_instance, event_queue):
# type: (serial.Serial, queue.Queue) -> None
super(SerialReader, self).__init__()
self.baud = serial_instance.baudrate
self.serial = serial_instance
self.event_queue = event_queue
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self.gdb_exit = False
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if not hasattr(self.serial, 'cancel_read'):
# enable timeout for checking alive flag,
# if cancel_read not available
self.serial.timeout = CHECK_ALIVE_FLAG_TIMEOUT
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def run(self):
# type: () -> None
if not self.serial.is_open:
self.serial.baudrate = self.baud
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# We can come to this thread at startup or from external application line GDB.
# If we come from GDB we would like to continue to run without reset.
high = False
low = True
self.serial.dtr = low # Non reset state
self.serial.rts = high # IO0=HIGH
self.serial.dtr = self.serial.dtr # usbser.sys workaround
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# Current state not reset the target!
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self.serial.open()
if not self.gdb_exit:
self.serial.dtr = high # Set dtr to reset state (affected by rts)
self.serial.rts = low # Set rts/dtr to the reset state
self.serial.dtr = self.serial.dtr # usbser.sys workaround
# Add a delay to meet the requirements of minimal EN low time (2ms for ESP32-C3)
time.sleep(MINIMAL_EN_LOW_DELAY)
self.gdb_exit = False
self.serial.rts = high # Set rts/dtr to the working state
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self.serial.dtr = self.serial.dtr # usbser.sys workaround
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try:
while self.alive:
try:
data = self.serial.read(self.serial.in_waiting or 1)
except (serial.serialutil.SerialException, IOError) as e:
data = b''
# self.serial.open() was successful before, therefore, this is an issue related to
# the disappearance of the device
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red_print(e)
yellow_print('Waiting for the device to reconnect', newline='')
self.serial.close()
while self.alive: # so that exiting monitor works while waiting
try:
time.sleep(RECONNECT_DELAY)
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self.serial.open()
break # device connected
except serial.serialutil.SerialException:
yellow_print('.', newline='')
sys.stderr.flush()
yellow_print('') # go to new line
if data:
self.event_queue.put((TAG_SERIAL, data), False)
finally:
self.serial.close()
def _cancel(self):
# type: () -> None
if hasattr(self.serial, 'cancel_read'):
try:
self.serial.cancel_read()
except Exception: # noqa
pass
class LinuxReader(Reader):
""" Read data from the subprocess that runs runnable and push to the
event queue, until stopped.
"""
def __init__(self, process, event_queue):
# type: (subprocess.Popen, queue.Queue) -> None
super().__init__()
self.proc = process
self.event_queue = event_queue
self._stdout = iter(self.proc.stdout.readline, b'') # type: ignore
def run(self): # type: () -> None
try:
while self.alive:
for line in self._stdout:
if line:
self.event_queue.put((TAG_SERIAL, line), False)
finally:
self.proc.terminate()
def _cancel(self): # type: () -> None
self.proc.terminate()