Arduino/Host Communications issues

I'm having an issue with the communications between the arduino 1.3 firmware and the source software. I can send data to the arduino just fine, but I can't read anything from either the opto-endstops or the temperature sensor. After putting the software in communications debug mode, I got the following printout:


james@switzer:~/Desktop/ardinstall/reprap-host-20080523$ ./reprap-host
DEBUG: Opening port /dev/ttyUSB0 [0.002s/-1228951046045ms]
Experimental: JNI_OnLoad called.
Stable Library
=========================================
Native lib Version = RXTX-2.1-7
Java lib Version = RXTX-2.1-7
DEBUG: Attempting to initialize Arduino [0.063s/61ms]
Java 3D WARNING : reported GLX version = 1.2
GLX version 1.3 or higher is required
The reported version number may be incorrect. There is a known
ATI driver bug in glXQueryVersion that incorrectly reports the GLX
version as 1.2 when it really is 1.3, so Java 3D will attempt to
run anyway.
comms: tx 0->8: 0 ( = 0 ) [4.112s/4049ms]
comms: rx: 30 30 30 30 30 30 30 30 30 30 54 52 30 0 8 c3 ( = 48 48 48 48 48 48 48 48 48 48 84 82 48 0 8 195 ) [4.126s/14ms]
comms: rx: 54 51 33 0 8 0 1 0 6d ( = 84 81 51 0 8 0 1 0 109 ) [4.131s/5ms]
DEBUG: CAPA extruder vRefFactor set to 7 [4.131s/0ms]
comms: tx 0->8: 34 7 ( = 52 7 ) [4.131s/0ms]
comms: rx: 54 52 30 0 8 c3 ( = 84 82 48 0 8 195 ) [4.142s/11ms]
comms: tx 0->8: 35 4 ( = 53 4 ) [4.143s/1ms]
comms: rx: 54 52 30 0 8 c3 ( = 84 82 48 0 8 195 ) [4.159s/16ms]
comms: tx 0->8: 0 ( = 0 ) [4.159s/0ms]
comms: rx: 54 52 30 0 8 c3 ( = 84 82 48 0 8 195 ) [4.175s/16ms]
comms: rx: 54 51 33 0 8 0 1 0 6d ( = 84 81 51 0 8 0 1 0 109 ) [4.178s/3ms]
comms: tx 0->9: 0 ( = 0 ) [4.186s/8ms]
comms: rx: 54 51 31 9 0 0 11 ( = 84 81 49 9 0 0 17 ) [4.207s/21ms]
DEBUG: Device at address 9 not present [4.207s/0ms]
comms: tx 0->9: 0 ( = 0 ) [4.207s/0ms]
comms: rx: 54 51 31 9 0 0 11 ( = 84 81 49 9 0 0 17 ) [4.223s/16ms]
DEBUG: Device at address 9 not present [4.223s/0ms]
Exception in thread "RepRap" java.lang.NullPointerException
at javax.swing.ImageIcon.(ImageIcon.java:138)
at org.reprap.gui.botConsole.PrintTabPanel.initComponents(Unknown Source)
at org.reprap.gui.botConsole.PrintTabPanel.(Unknown Source)
at org.reprap.gui.botConsole.BotConsoleFrame.initComponents(Unknown Source)
at org.reprap.gui.botConsole.BotConsoleFrame.(Unknown Source)
at org.reprap.gui.botConsole.BotConsoleFrame$1.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
comms: tx 0->8: 8 ( = 8 ) [4.592s/369ms]
comms: rx: 54 52 30 0 8 c3 ( = 84 82 48 0 8 195 ) [4.607s/15ms]
comms: rx: 54 51 32 0 8 8 0 4d ( = 84 81 50 0 8 8 0 77 ) [4.610s/3ms]
comms: tx 0->8: a ( = 10 ) [4.610s/0ms]
comms: rx: 54 52 30 0 8 c3 ( = 84 82 48 0 8 195 ) [4.623s/13ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [4.686s/63ms]
comms: rx: 54 51 33 0 8 a fe 12 a7 ( = 84 81 51 0 8 10 254 18 167 ) [4.735s/49ms]
DEBUG: CAPA extruder current temp -28.577268425245023 [4.735s/0ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [5.187s/452ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [5.687s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [6.187s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [6.688s/501ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [7.188s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [7.690s/502ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [8.190s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [8.691s/501ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [9.191s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [9.691s/500ms]
DEBUG: Attempting to control or interrogate non-existent extruder for PDMS [10.192s/501ms]


Has anyone had this problem before? Any idea where the problem is or how to fix it?

I forgot to mention, I'm using an Arduino diecimila (with built-in USB/Serial converter), and ubuntu 8.04

That null pointer exception seems to be a glitch with ver 0.9. Doesn't seem to be fatal, though.

The "non-existent extruder for PDMS" is likely because your preferences have 2 extruders defined in the preferences. Changing the number of extruders to 1 should get rid of that.

Beyond that, it's kinda hard to see what's going on, short of picking through the hex codes. Cursory glance shows that it's talking to extruder0 (address 8) at least.

Here's some documentation to help sift through the debug info:
RepRap SNAP comms: [reprap.org]
Extruder commands: [reprap.org]
SNAP docs: [www.hth.com]

I'm tempted to write a javascript app that interprets SNAP hex codes.

OK, here's a rudimentary SNAP interpreter: [degroof.googlepages.com]

I haven't tested it exhaustively, so it might not work under all conditions.