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by Jason
Wed Nov 30, 2011 1:44 pm
Forum: General discussion
Topic: USB RS232 Serial Port
Replies: 3
Views: 1373

Re: USB RS232 Serial Port

<r>If you only need simple RS232, then a level shift (3v3 to RS232 levels) would be an easy add-on using the GPIO.<br/> From what I've seen, you don't get CTS/RTS etc, but a basic 3-wire RS232 connection will be fairly easy between you.<br/> The FTDI chips are fairly well supported by Linux;<br/> <U...
by Jason
Thu Nov 17, 2011 12:31 pm
Forum: Off topic discussion
Topic: YOU SUCK: the venting thread
Replies: 948
Views: 180033

Re: YOU SUCK: the venting thread

<r>For me, getting back to the UK from our Honeymoon (cut short as I took a Booking to DJ a Wedding), then back in the office Monday.<br/> It was over too quick, now wishing I didn't take that gig and we had 2 weeks out there....<br/> <br/> Now, coding low level I2C Drivers. In a Lab with no externa...
by Jason
Fri Sep 30, 2011 1:03 pm
Forum: General discussion
Topic: Max data rate over I2C/SPI/UART
Replies: 21
Views: 16086

Re: Max data rate over I2C/SPI/UART

<t>I don't think I2C is suitable for high-speed. SPI has better quality signals, and I've seen 70Mhz clock rates. SPI may need an additional /CS signal (so CLK, MOSI, MISO and /CS.. and GND)<br/> <br/> I'm currently using a NI sbRIO controller and are getting around 8Mhz clock (using the FPGA for cl...
by Jason
Fri Sep 30, 2011 12:45 pm
Forum: General discussion
Topic: RS232
Replies: 10
Views: 5846

Re: RS232

<t>I have used a SPI based UART with 4 (?) UARTS onboard. You'd need to level shift, but these have internal FIFOs and can run at fairly high speed (so RS485/422 rates). You'd need your own drivers.<br/> <br/> Sadly, RS232 is only really used in industry and that it being phased out in preference to...
by Jason
Mon Sep 26, 2011 1:24 pm
Forum: Off topic discussion
Topic: HDMI to VGA connector
Replies: 29
Views: 9043

Re: HDMI to VGA connector

<r>Quote from trigger on September 26, 2011, 12:52<br/> So what's involved in making a HDMI to VGA adapter for the Raspi? Does anyone have any circuit designs to do this? <br/> <br/> I can't see this being easy (unless there are off-the-shelf IC's to do this)<br/> HDMI is basically high speed digita...
by Jason
Mon Sep 12, 2011 1:09 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3745
Views: 230725

Re: Introduce yourself!

<r>Hi!<br/> I'm Jason, based in the UK (Hertfordshire/North London).<br/> By day, I'm a product developer using embedded/realtime, with some hardware involvement.<br/> Prior roles have been in Motion Control (robotics etc), and Tech Support.<br/> <br/> My first computer was a Sinclair Spectrum, and ...
by Jason
Mon Sep 12, 2011 1:00 pm
Forum: Other projects
Topic: Turn Raspberry Pi into a P.L.C (Programable Logic Controller) Advanced
Replies: 233
Views: 266589

Re: Turn Raspberry Pi into a P.L.C (Programable Logic Controller) Advanced

<t>Quote from vorrias on September 11, 2011, 18:25<br/> So coming back to what field bus we have to use, I had an interesting talk with Eduard from Beremiz team.<br/> He told me that If we go with 3rd party field bus devices to do IO's then we will come up with an expensive solution, R-PI should hav...
by Jason
Sun Sep 11, 2011 11:19 am
Forum: Off topic discussion
Topic: iOS :)
Replies: 15
Views: 4150

Re: iOS :)

I doubt this would be possible, but a x86 VM running on the 'Pi "may" allow Windows/iOS.
I'm thinking QEMU or similar.

A far more achievable solution would be Android, or even Googles Chrome OS, at least they have code for ARM.
by Jason
Sun Sep 11, 2011 10:59 am
Forum: Other projects
Topic: Break out board (GPIO, SPI, I2C, and UART)
Replies: 189
Views: 47237

Re: Break out board (GPIO, SPI, I2C, and UART)

<t>(1st post..)<br/> <br/> I'd like to see SPI, or I guess I2C available.<br/> SPI has the advantage of better quality signals, faster clock rates and the signals are unidirectional (so 3v3 to 5v buffering is simple).<br/> I use both, and have also used I2C multiplexers to give 4 x I2C busses from a...

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