Part 2 is to implement M23: select file. That's more than just a
few lines, as we also have to teach the gcode-parser to collect
strings.
For now the file is simply tested for successful opening, no
actual printing, yet.
About build size: during development there was another
implementation, which didn't abstract SD card functions into
sd.c/.h, but put them into gcode_process.c directly. At the
feature completeness of this commit, the other implementation
used 70 bytes flash less, but also 23 bytes more RAM. So I decided
for the more abstracted/encapsulated version. --Traumflug
Also, this adds 14 bytes binary size even without SD card support.
A lot more #ifdefs around each use of next_target.read_string
would remove this, but after all we do care a bit about
readability of the source code, so let's sacrify these 14 bytes
to it. --Traumflug
##############################################################################
# #
# Teacup - lean and efficient firmware for RepRap printers #
# #
# by Triffid Hunter, Traumflug, jakepoz, many others. #
# #
##############################################################################
For installation instructions, see
http://reprap.org/wiki/Teacup_Firmware#Simple_Installation and/or
http://reprap.org/wiki/Teacup_Firmware#Developer_Installation
For documentation, see
http://reprap.org/wiki/Teacup_Firmware
##############################################################################
# #
# This firmware is Copyright (c) ... #
# 2009 - 2010 Michael Moon aka Triffid_Hunter #
# 2010 - 2013 Markus "Traumflug" Hitter <mah@jump-ing.de> #
# #
# This program is free software; you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation; either version 2 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA #
# #
##############################################################################
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