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