#emc-devel | Logs for 2008-05-05

[18:51:02] <CIA-32> EMC: 03rayh 07TRUNK * 10emc2/docs/src/common/Glossary.lyx: edits and a couple added words
[20:34:40] <alex_joni> hmm.. I should try wubi one of these days...
[20:42:43] <jepler> of all the things they shouldn't have wasted their time on </mho>
[20:45:57] <alex_joni> yeah, but it could make emc2 much more attractive as an alternative to other win-blows systems
[21:08:04] <CIA-32> EMC: 03jepler 07TRUNK * 10emc2/docs/src/hal/comp.lyx: make the 'constant' example compile
[21:08:29] <CIA-32> EMC: 03jepler 07v2_2_branch * 10emc2/docs/src/hal/comp.lyx: from TRUNK: make the 'constant' example compile
[21:08:52] <skunkworks_> jepler: did you get a chance to see if the 8255 was dead?
[21:09:21] <jepler> skunkworks_: a chance ? I had plenty of time this weekend when I *could have* tried to do something with it, but I did not.
[21:09:28] <skunkworks_> heh :)
[21:09:54] <jepler> that and the laundry, the two great undone tasks of the weekend :-P
[21:09:58] <jepler> oh, and the dishes on sunday
[21:10:03] <jepler> sigh
[21:10:06] <jepler> bbl
[21:10:56] <skunkworks_> you're just a procrastinator. :)
[23:05:32] <jepler> wallygl: http://www.cnc-workshop.com/ http://www.cnc-workshop.com/map.htm
[23:05:46] <jepler> wallygl: it's more effective to ask your questions in the channel then in private message
[23:06:05] <jepler> * jepler wanders off again
[23:46:41] <jepler> that guy did not understand how to use irc (he thanked me in private too)
[23:48:23] <jepler> data point: with the driver on the 8.04 live cd and a different computer, adding the read function crashes the system
[23:48:43] <jepler> data point: after removing two DIP 74hct245 chips (bus transceivers), adding the read function does *not* crash the system
[23:48:55] <jepler> this effectively has disconnected the tiger320 chip from the 8255 chips
[23:50:04] <jepler> the tiger320 internal configuration registers are now reading again, though I didn't check today before removing the chips (their values are only printed in my build, not in 2.2.5)
[23:52:53] <jepler> it appears that one of the '245s is used to level-shift the address and control signals to 5V from the voltage the tiger320 uses, probably 3.3v.
[23:53:14] <jepler> the other is used to either gate the data from the tiger320 data bus onto the 8255 data bus or vice versa
[23:54:08] <jepler> it seems to me that if the logic of the '245 direction register isn't right, it might be driving one of the buses at the wrong time
[23:59:17] <jmkasunich> the 245 doesn't have a direction register, just a dir pin
[23:59:27] <jmkasunich> do you know what drives the pin?
[23:59:59] <jmkasunich> btw, that certainly could explain the results you've seen - bus contention if the 8255 side is driving the tiger side a the same time as the tiger is trying to drive back