Go to advanced search

by jrychter
Fri Dec 15, 2017 10:47 am
Forum: Compute Module
Topic: WiFi chip for Compute Module 3
Replies: 22
Views: 20031

Re: WiFi chip for Compute Module 3

I've had good experiences with TI WiLink chips, connected via SDIO. They exist in the form of pre-certified modules from a number of vendors (I used a Jorjin WG7831DELF). WiLink8 chips will do WiFi and Bluetooth, in various bands, depending on the specific option you choose. TI supplies Linux driver...
by jrychter
Mon May 22, 2017 1:35 pm
Forum: Compute Module
Topic: CM3 rpiboot get serial number
Replies: 5
Views: 1203

Re: CM3 rpiboot get serial number

Board revision?

To clarify: what is actually needed is the MAC address. This seems to be derived from the CM serial number. Board revision isn't that helpful.
by jrychter
Mon May 22, 2017 12:30 pm
Forum: Compute Module
Topic: CM3 rpiboot get serial number
Replies: 5
Views: 1203

Re: CM3 rpiboot get serial number

Anyone? Reading the serial number (or the MAC) at rpiboot stage is important in production. When mass-producing devices with CM modules, one usually needs to program the onboard flash and read the MAC address (for printing stickers, keeping a database of devices, etc). If this requires an additional...
by jrychter
Sat Nov 26, 2016 11:37 am
Forum: Camera board
Topic: IO0 and IO1 signals
Replies: 5
Views: 1252

Re: IO0 and IO1 signals

Thanks for all the info. I decided to terminate IO1 with a pullup, which shouldn't hurt anything, and properly level-shift the IO0 line so that it works as intended.
by jrychter
Wed Nov 09, 2016 8:45 am
Forum: Camera board
Topic: IO0 and IO1 signals
Replies: 5
Views: 1252

Re: IO0 and IO1 signals

Hey 6by9 — thanks for the explanation! Ok, so I went ahead and double-checked with a logic analyzer. Here's what I'm seeing: * IO0 line starts low, then goes high during bootup for about 6ms, during which time there is some I2C chatter. Then the line goes low again. * IO0 goes high when I actually s...
by jrychter
Tue Nov 08, 2016 1:10 pm
Forum: Camera board
Topic: IO0 and IO1 signals
Replies: 5
Views: 1252

Re: IO0 and IO1 signals

Responding to myself — I checked, and IO0 is brought high during powerup, it always stays high. It seems to be an ENABLE signal that keeps the camera turned on. IO1 goes high while the camera is actually active (recording video). It seems to me that I can safely just use pullups for both of those si...
by jrychter
Sun Nov 06, 2016 8:19 pm
Forum: Camera board
Topic: IO0 and IO1 signals
Replies: 5
Views: 1252

IO0 and IO1 signals

Hi, I've been wondering — are the IO0 and IO1 signals actually used? I am designing a board with an RPI Compute Module, and routing these signals across the board is a bit of a nuisance. When the camera is up and running, it seems these lines always stay high. I don't know what they are supposed to ...
by jrychter
Wed Oct 19, 2016 10:51 am
Forum: Compute Module
Topic: Where to buy CSI-2 camera ports
Replies: 4
Views: 1702

Re: Where to buy CSI-2 camera ports

Hi,

For the FPC/FFC connectors, I used to use Molex 52610-1572 or 52610-1533 depending on which one was cheaper at the time (the difference is the gold plating). I am now switching to Wuerth 686115148922.

Hope this helps!
by jrychter
Fri Sep 16, 2016 2:45 pm
Forum: Compute Module
Topic: Availability
Replies: 33
Views: 4586

Re: Availability

To expand on the point in my previous post, do you need all four cores runnings? Will you be using the camera? Will you be using the 3D block? Will you be using the H264 decoder or encoder? Hmm. I'm not sure if these questions are serious (I use two cameras, encoded to mjpeg, no display whatsoever,...
by jrychter
Thu Sep 15, 2016 7:31 am
Forum: Compute Module
Topic: Availability
Replies: 33
Views: 4586

Re: Availability

I realize it sounds like I'm complaining, but I just wanted to explain: "more than the CM1" doesn't cut it, when your PoE-powered device sits right on the edge of two different flyback transformers. Do I overprovision and accept the increased cost and physical dimensions of a larger transformer? Or ...
by jrychter
Wed Sep 14, 2016 12:46 pm
Forum: Compute Module
Topic: Availability
Replies: 33
Views: 4586

Re: Availability

Oh, I do hope that nobody is playing games like that (anniversary launches), especially with the essentially non-consumer product that the Compute Module is. I am hoping for quick availability, but more importantly, I'm really hoping we will finally see some specs. I don't want to have to wait until...
by jrychter
Thu Sep 01, 2016 10:56 am
Forum: Compute Module
Topic: CM3 specs
Replies: 14
Views: 3644

Re: CM3 specs

I looked at the git commit and I like the "i2c2_iknowwhatimdoing" line :-) That's the same as all the other platforms - see https://github.com/raspberrypi/linux/issues/1028 i2c2 is used by the HDMI interface to read the EDID information, so to use it for other purposes you need to know what you're ...
by jrychter
Thu Sep 01, 2016 8:12 am
Forum: Compute Module
Topic: CM3 specs
Replies: 14
Views: 3644

Re: CM3 specs

Thanks for all the tips. I have already sent an E-mail to the foundation (no response so far) and will try other means of contact. I looked at the git commit and I like the "i2c2_iknowwhatimdoing" line :-) I think I also now understand why the 22-pin connectors with the weird converters appeared on ...
by jrychter
Tue Aug 30, 2016 8:53 am
Forum: Compute Module
Topic: CM3 specs
Replies: 14
Views: 3644

Re: CM3 specs

I'm afraid you will have to wait until the CM3 is released. The RPF/RPT don't release details of their new products until they are ready, partly in case any of the specs need to be changed at any point. Sigh. Well, this is a bit of a problem — I mean, in the hobby world, this is perfectly fine, but...
by jrychter
Sun Aug 28, 2016 8:40 am
Forum: Compute Module
Topic: CM3 specs
Replies: 14
Views: 3644

CM3 specs

Hi, We are building a product based on the Compute Module (and two RPI v2.1 cameras). Production is about to start, and we're about to start working on the next hardware version. However, I am completely in the dark regarding the rumored CM3. I don't actually need an exact shipping date (e.g. "later...
by jrychter
Fri Jul 01, 2016 8:04 am
Forum: Compute Module
Topic: 4 Camera Modules with Compute Module & IO Board
Replies: 8
Views: 3331

Re: 4 Camera Modules with Compute Module & IO Board

Are you thinking of using the FSA642 MIPI switch to swap the SOC's CSI input lines between two physical cameras without the SOC being aware that it is getting even frames from one camera and odd frames from a different camera? Yes. I see no reason for it not to work, if you don't push everything to...
by jrychter
Thu Jun 30, 2016 5:09 pm
Forum: Compute Module
Topic: 4 Camera Modules with Compute Module & IO Board
Replies: 8
Views: 3331

Re: 4 Camera Modules with Compute Module & IO Board

Actually, I've been looking at the same problem and there is a reasonably straightforward way to use more than 2 cameras in hardware, but it requires software support. I haven't looked at the driver code (is all of it actually available?) to see how complex that would be. Hardware-side, you do it by...
by jrychter
Thu Jun 30, 2016 5:00 pm
Forum: Compute Module
Topic: Factory programming
Replies: 7
Views: 1336

Re: Factory programming

Thanks for all the advice. For now I will use a FSUSB42 and 3 MOSFETs like the IO board, as I can't risk delays. In the future, however, I will want to eliminate it, because of the cost, so I'll try a hacky solution with holding the LAN9500 in reset and attaching a programmer connection somewhere.
by jrychter
Tue Jun 28, 2016 2:45 pm
Forum: Compute Module
Topic: Factory programming
Replies: 7
Views: 1336

Re: Factory programming

Thanks for the helpful info! I guess the switch is the way to go, then, just like on the CM IO board (a FSUSB42 DPDT switch is used there). I wondered about the possibility of holding the LAN9500 in reset, which should prevent it from doing anything to the USB signals (I'd expect them to go HiZ). It...
by jrychter
Tue Jun 28, 2016 12:55 pm
Forum: Compute Module
Topic: Factory programming
Replies: 7
Views: 1336

Factory programming

I'm designing a board that will host the RPi Compute Module and I'm wondering about how people go about factory programming the CMs. It seems the only way is to use USB, like the IO board. But that has drawbacks: on my board, instead of the cheaper&simpler LAN9500, I'd have to use a LAN9512 with the...

Go to advanced search