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Prevent sending next command before an "ok" is received

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fieldOfView 2018-03-30 14:07:53 +02:00
parent 261945b469
commit 08d4200f92
1 changed files with 23 additions and 14 deletions
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37
plugins/USBPrinting/USBPrinterOutputDevice.py
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@ -18,7 +18,7 @@ from .avr_isp import stk500v2, intelHex
from PyQt5.QtCore import pyqtSlot, pyqtSignal, pyqtProperty
from serial import Serial, SerialException, SerialTimeoutException
from threading import Thread
from threading import Thread, Event
from time import time, sleep
from queue import Queue
from enum import IntEnum
@ -82,8 +82,11 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
self.setConnectionText(catalog.i18nc("@info:status", "Connected via USB"))
# Queue for commands that need to be send. Used when command is sent when a print is active.
# Queue for commands that need to be sent.
self._command_queue = Queue()
# Event to indicate that an "ok" was received from the printer after sending a command.
self._command_received = Event()
self._command_received.set()
## Reset USB device settings
#
@ -263,23 +266,24 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
## Send a command to printer.
def sendCommand(self, command: Union[str, bytes]):
if self._is_printing:
if not self._command_received.is_set():
self._command_queue.put(command)
elif self._connection_state == ConnectionState.connected:
else:
self._sendCommand(command)
def _sendCommand(self, command: Union[str, bytes]):
if self._serial is None:
if self._serial is None or self._connection_state != ConnectionState.connected:
return
if type(command == str):
command = (command + "\n").encode()
command = command.encode()
if not command.endswith(b"\n"):
command += b"\n"
try:
self._command_received.clear()
self._serial.write(command)
except SerialTimeoutException:
Logger.log("w", "Timeout when sending command to printer via USB.")
self._command_received.set()
def _update(self):
while self._connection_state == ConnectionState.connected and self._serial is not None:
@ -290,6 +294,8 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
if self._last_temperature_request is None or time() > self._last_temperature_request + self._timeout:
# Timeout, or no request has been sent at all.
self._command_received.set() # We haven't really received the ok, but we need to send a new command
self.sendCommand("M105")
self._last_temperature_request = time()
@ -316,17 +322,20 @@ class USBPrinterOutputDevice(PrinterOutputDevice):
if b"FIRMWARE_NAME:" in line:
self._setFirmwareName(line)
if b"ok" in line:
self._command_received.set()
if not self._command_queue.empty():
self._sendCommand(self._command_queue.get())
if self._is_printing:
if self._paused:
pass # Nothing to do!
else:
self._sendNextGcodeLine()
if self._is_printing:
if line.startswith(b'!!'):
Logger.log('e', "Printer signals fatal error. Cancelling print. {}".format(line))
self.cancelPrint()
if b"ok" in line:
if not self._command_queue.empty():
self._sendCommand(self._command_queue.get())
elif self._paused:
pass # Nothing to do!
else:
self._sendNextGcodeLine()
elif b"resend" in line.lower() or b"rs" in line:
# A resend can be requested either by Resend, resend or rs.
try: