163 lines
6.2 KiB
Python
163 lines
6.2 KiB
Python
# Virtual sdcard support (print files directly from a host g-code file)
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#
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# Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import os, logging
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class VirtualSD:
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def __init__(self, config):
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printer = config.get_printer()
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# sdcard state
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sd = config.get('path')
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self.sdcard_dirname = os.path.normpath(os.path.expanduser(sd))
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self.current_file = None
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self.file_position = self.file_size = 0
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# Work timer
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self.reactor = printer.get_reactor()
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self.must_pause_work = False
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self.work_timer = None
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# Register commands
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self.gcode = printer.lookup_object('gcode')
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for cmd in ['M20', 'M21', 'M23', 'M24', 'M25', 'M26', 'M27']:
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self.gcode.register_command(cmd, getattr(self, 'cmd_' + cmd))
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for cmd in ['M28', 'M29', 'M30']:
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self.gcode.register_command(cmd, self.cmd_error)
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def printer_state(self, state):
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if state == 'shutdown' and self.work_timer is not None:
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self.must_pause_work = True
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def get_file_list(self):
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dname = self.sdcard_dirname
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try:
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filenames = os.listdir(self.sdcard_dirname)
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return [(fname, os.path.getsize(os.path.join(dname, fname)))
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for fname in filenames]
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except:
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logging.exception("virtual_sdcard get_file_list")
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raise self.gcode.error("Unable to get file list")
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def get_status(self, eventtime):
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progress = 0.
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if self.work_timer is not None and self.file_size:
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progress = float(self.file_position) / self.file_size
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return {'progress': progress}
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# G-Code commands
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def cmd_error(self, params):
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raise self.gcode.error("SD write not supported")
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def cmd_M20(self, params):
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# List SD card
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files = self.get_file_list()
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self.gcode.respond("Begin file list")
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for fname, fsize in files:
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self.gcode.respond("%s %d" % (fname, fsize))
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self.gcode.respond("End file list")
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def cmd_M21(self, params):
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# Initialize SD card
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self.gcode.respond("SD card ok")
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def cmd_M23(self, params):
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# Select SD file
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if self.work_timer is not None:
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raise self.gcode.error("SD busy")
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if self.current_file is not None:
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self.current_file.close()
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self.current_file = None
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self.file_position = self.file_size = 0
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try:
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orig = params['#original']
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filename = orig[orig.find("M23") + 4:].split()[0].strip()
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if '*' in filename:
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filename = filename[:filename.find('*')].strip()
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except:
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raise self.gcode.error("Unable to extract filename")
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if filename.startswith('/'):
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filename = filename[1:]
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files = self.get_file_list()
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files_by_lower = { fname.lower(): fname for fname, fsize in files }
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try:
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fname = files_by_lower[filename.lower()]
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fname = os.path.join(self.sdcard_dirname, fname)
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f = open(fname, 'rb')
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f.seek(0, os.SEEK_END)
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fsize = f.tell()
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f.seek(0)
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except:
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logging.exception("virtual_sdcard file open")
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raise self.gcode.error("Unable to open file")
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self.gcode.respond("File opened:%s Size:%d" % (filename, fsize))
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self.gcode.respond("File selected")
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self.current_file = f
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self.file_position = 0
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self.file_size = fsize
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def cmd_M24(self, params):
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# Start/resume SD print
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if self.work_timer is not None:
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raise self.gcode.error("SD busy")
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self.must_pause_work = False
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self.work_timer = self.reactor.register_timer(
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self.work_handler, self.reactor.NOW)
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def cmd_M25(self, params):
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# Pause SD print
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if self.work_timer is not None:
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self.must_pause_work = True
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def cmd_M26(self, params):
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# Set SD position
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if self.work_timer is not None:
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raise self.gcode.error("SD busy")
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pos = self.gcode.get_int('S', params)
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self.file_position = pos
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def cmd_M27(self, params):
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# Report SD print status
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if self.current_file is None or self.work_timer is None:
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self.gcode.respond("Not SD printing.")
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return
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self.gcode.respond("SD printing byte %d/%d" % (
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self.file_position, self.file_size))
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# Background work timer
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def work_handler(self, eventtime):
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self.reactor.unregister_timer(self.work_timer)
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try:
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self.current_file.seek(self.file_position)
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except:
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logging.exception("virtual_sdcard seek")
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self.gcode.respond_error("Unable to seek file")
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self.work_timer = None
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return self.reactor.NEVER
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partial_input = ""
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lines = []
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while not self.must_pause_work:
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if not lines:
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# Read more data
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try:
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data = self.current_file.read(8192)
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except:
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logging.exception("virtual_sdcard read")
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self.gcode.respond_error("Error on virtual sdcard read")
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break
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if not data:
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# End of file
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self.current_file.close()
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self.current_file = None
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self.gcode.respond("Done printing file")
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break
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lines = data.split('\n')
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lines[0] = partial_input + lines[0]
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partial_input = lines.pop()
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lines.reverse()
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continue
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# Dispatch command
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try:
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res = self.gcode.process_batch(lines[-1])
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if not res:
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self.reactor.pause(self.reactor.monotonic() + 0.100)
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continue
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except self.gcode.error as e:
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break
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except:
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logging.exception("virtual_sdcard dispatch")
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break
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self.file_position += len(lines.pop()) + 1
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self.work_timer = None
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return self.reactor.NEVER
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def load_config(config):
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return VirtualSD(config)
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