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102 lines
4.1 KiB
Python
102 lines
4.1 KiB
Python
# Copyright 2015-2021 Espressif Systems (Shanghai) CO LTD
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import sys
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import time
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import serial
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from .constants import TAG_SERIAL
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from .output_helpers import red_print, yellow_print
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from .stoppable_thread import StoppableThread
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try:
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import queue
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except ImportError:
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import Queue as queue # type: ignore # noqa
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class SerialReader(StoppableThread):
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""" Read serial data from the serial port and push to the
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event queue, until stopped.
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"""
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def __init__(self, serial_instance, event_queue):
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# type: (serial.Serial, queue.Queue) -> None
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super(SerialReader, self).__init__()
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self.baud = serial_instance.baudrate
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self.serial = serial_instance
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self.event_queue = event_queue
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self.gdb_exit = False
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if not hasattr(self.serial, 'cancel_read'):
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# enable timeout for checking alive flag,
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# if cancel_read not available
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self.serial.timeout = 0.25
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def run(self):
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# type: () -> None
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if not self.serial.is_open:
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self.serial.baudrate = self.baud
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# We can come to this thread at startup or from external application line GDB.
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# If we come from GDB we would like to continue to run without reset.
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if self.gdb_exit:
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self.serial.rts = False
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self.serial.dtr = True
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else: # if we exit from GDB, we don't need to reset the target
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# This sequence of DTR/RTS and open/close set the serial port to
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# condition when GDB not make reset of the target by switching DTR/RTS.
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self.serial.rts = True # IO0=LOW
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self.serial.dtr = self.serial.dtr # usbser.sys workaround
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self.serial.rts = False # IO0=HIGH
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self.serial.dtr = False
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# Current state not reset the target!
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self.gdb_exit = False
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self.serial.open()
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time.sleep(0.005) # Add a delay to meet the requirements of minimal EN low time (2ms for ESP32-C3)
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self.serial.rts = False # 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:
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while self.alive:
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try:
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data = self.serial.read(self.serial.in_waiting or 1)
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except (serial.serialutil.SerialException, IOError) as e:
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data = b''
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# self.serial.open() was successful before, therefore, this is an issue related to
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# the disapperence of the device
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red_print(e)
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yellow_print('Waiting for the device to reconnect', newline='')
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self.serial.close()
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while self.alive: # so that exiting monitor works while waiting
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try:
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time.sleep(0.5)
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self.serial.open()
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break # device connected
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except serial.serialutil.SerialException:
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yellow_print('.', newline='')
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sys.stderr.flush()
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yellow_print('') # go to new line
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if data:
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self.event_queue.put((TAG_SERIAL, data), False)
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finally:
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self.serial.close()
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def _cancel(self):
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# type: () -> None
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if hasattr(self.serial, 'cancel_read'):
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try:
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self.serial.cancel_read()
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except Exception: # noqa
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pass
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