1 files changed, 72 insertions, 0 deletions
diff --git a/externals/gridflow/devices4ruby/ParallelPort.rb b/externals/gridflow/devices4ruby/ParallelPort.rb
new file mode 100644
index 00000000..10188592
--- /dev/null
+++ b/externals/gridflow/devices4ruby/ParallelPort.rb
@@ -0,0 +1,72 @@
+require "linux/ioctl"
+# Copyright (c) 2001, 2003 by Mathieu Bouchard
+# this is published under the Ruby license
+
+=begin
+  if using a DB-25 female connector as found on a PC,
+  then the pin numbering is like:
+  13 _____ 1
+  25 \___/ 14
+
+  1 = STROBE = the clock line is a square wave, often at 9600 Hz,
+      which determines the data rate in usual circumstances.
+  2..9 = D0..D7 = the eight ordinary data bits
+  10 = -ACK (status bit 6 ?)
+  11 = BUSY (status bit 7)
+  12 = PAPER_END (status bit 5)
+  13 = SELECT (status bit 4 ?)
+  14 = -AUTOFD
+  15 = -ERROR (status bit 3 ?)
+  16 = -INIT
+  17 = -SELECT_IN
+  18..25 = GROUND
+=end
+
+module Linux; module ParallelPort
+	extend IoctlClass
+
+	@port_flags = %w[
+	LP_EXIST
+	LP_SELEC
+	LP_BUSY
+	LP_OFFL
+	LP_NOPA
+	LP_ERR
+	LP_ABORT
+	LP_CAREFUL
+	LP_ABORTOPEN
+	LP_TRUST_IRQ
+	]
+
+	@port_status = %w[
+		nil,
+		nil,
+		nil,
+		LP_PERRORP  # unchanged input, active low
+		LP_PSELECD  # unchanged input, active high
+		LP_POUTPA   # unchanged input, active high
+		LP_PACK     # unchanged input, active low
+		LP_PBUSY    # inverted input, active high
+	]
+
+	LPCHAR = 0x0601
+	LPTIME = 0x0602
+	LPABORT = 0x0604
+	LPSETIRQ = 0x0605
+	LPGETIRQ = 0x0606
+	LPWAIT = 0x0608
+	LPCAREFUL = 0x0609 # obsoleted??? wtf?
+	LPABORTOPEN = 0x060a
+	LPGETSTATUS = 0x060b # return LP_S(minor)
+	LPRESET = 0x060c # reset printer
+	LPGETSTATS = 0x060d # struct lp_stats (most likely turned off)
+	LPGETFLAGS = 0x060e # get status flags
+	LPTRUSTIRQ = 0x060f # set/unset the LP_TRUST_IRQ flag
+
+	ioctl_reader :port_flags , :LPGETFLAGS
+	ioctl_reader :port_status, :LPGETSTATUS
+	ioctl_writer :port_careful,:LPCAREFUL
+	ioctl_writer :port_char,   :LPCHAR
+
+end end
+