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by wardyprojects
Mon Apr 01, 2013 2:37 pm
Forum: Troubleshooting
Topic: [RESOLVED] UART problem - reading back my own data
Replies: 5
Views: 1317

Re: UART problem - reading back my own data

Well, that was an interesting couple of hours of debugging. The fault was with a call to... ioctl(devFD, TIOCMGET, &portstatus); ...the portstatus variable was later being modified by a value that was initialised by another variable that was itself uninitialised. I had to break out valgrind with...
by wardyprojects
Sun Mar 31, 2013 5:32 pm
Forum: Troubleshooting
Topic: [RESOLVED] UART problem - reading back my own data
Replies: 5
Views: 1317

Re: UART problem - reading back my own data

In fact if I completely disconnect my circuit board from the RasPi entirely (in other words a bare bones RasPi) then the problem still exists.
by wardyprojects
Sun Mar 31, 2013 5:29 pm
Forum: Troubleshooting
Topic: [RESOLVED] UART problem - reading back my own data
Replies: 5
Views: 1317

Re: UART problem - reading back my own data

I've checked the circuit and there is no short between TX and RX (16 Megohms of resistance when powered off). Then I ran my logic analyzer (at an excessively high sampling rate of 16MS/s) on TX, RX and GPIO_0 (the latter being a simulated DTR signal). All signals were correct, even the analyzer's de...
by wardyprojects
Sun Mar 31, 2013 4:46 pm
Forum: Troubleshooting
Topic: [RESOLVED] UART problem - reading back my own data
Replies: 5
Views: 1317

[RESOLVED] UART problem - reading back my own data

I'm using a RasPi Rev B and I'm attempting to hook up the UART pins on the GPIO header (pins 8 and 10) to talk to another 3.3 volt slave device. I have a problem with getting the RasPi to read incoming data from the slave device. DESIRED BEHAVIOUR: RasPi sends "ABCD" slave sends "X&qu...
by wardyprojects
Fri Feb 24, 2012 9:15 pm
Forum: General discussion
Topic: more mem
Replies: 16
Views: 4343

Re: more mem

Sorry, I meant the Raspi.  It seems to be taking forever, but promises to be spectacular, so that's ok.

I can't wait to get one.  Even if I probably have to wait 2 years.
by wardyprojects
Fri Feb 24, 2012 8:49 pm
Forum: General discussion
Topic: more mem
Replies: 16
Views: 4343

Re: more mem

<t>Hi guys,<br/> <br/> I think my memory board might be a hindrance to the R'Pi rather than an asset.<br/> <br/> It's 4x8-bit parallel really, not serial, but yes the problem is that the CPU in the R'Pi is vastly too powerful and swift for my SRAM board to keep up with.  It was designed for microcon...

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