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by bootc
Wed Jun 20, 2012 8:01 pm
Forum: HATs and other add-ons
Topic: XBee ZB SMT Backpack
Replies: 0
Views: 2373

XBee ZB SMT Backpack

I have recently been working on a Raspberry Pi expansion board to host a Digi XBee ZB SMT . These are surface-mount ZigBee modules (not tiny pitch so not scary to solder) that can be interfaced with using SPI as well as serial. I'd really appreciate it if folks could have a look at my blog post abou...
by bootc
Tue Jun 19, 2012 5:56 pm
Forum: Camera board
Topic: Camera module! (And a picture of JamesH)
Replies: 431
Views: 166978

Re: Camera module! (And a picture of JamesH)

So what I'm working round to saying is: what sort of parameters are you working to in your selection of cameras (apart from price)? Taking into account: every camera needs a specific camera driver and tuning, so just getting the HW to match isn't enough A major selection criteria is whether a camer...
by bootc
Sun Jun 17, 2012 4:41 pm
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

Thought I'd best keep you folks posted:
http://www.bootc.net/archives/2012/06/1 ... 20-kernel/
by bootc
Sun Jun 17, 2012 12:18 pm
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

lb wrote:Careful, that branch doesn't apply cleanly, and it's missing an important patch. I've ported the changes over to the 3.2 kernel and added selsinork's fix for signaling voltage, it's in the rpi-3.2.19-sdhci branch.
Thanks. I'll use your branch instead.
by bootc
Sun Jun 17, 2012 9:20 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

dom wrote:lb has provided a clean set of sdcard patched here:
https://github.com/grigorig/rpi-linux/c ... rf-cleanup
I've picked up all the patches from this branch, so I'd think it sensible for you to do so to.
Thanks. Expect to see a new kernel from me soon! :-)
by bootc
Sun Jun 17, 2012 9:07 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

Folks - I'm just working on a 3.2.20 kernel and I really want to include these SD patches. Can anyone point me to where the latest and greatest patches are for me to include?

Thanks,
Chris
by bootc
Thu Jun 14, 2012 11:49 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

My kernel doesn't have any of the patches that really make a difference, as mentioned in this thread, yet.
by bootc
Wed Jun 13, 2012 9:03 pm
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

A firmware update w/o kernel update shouldn't be harmful. SD access will be slow due to the low clock, but that's all. The other way around won't work, though. Yes that's very true. bootc, by the way I ported the cleaned up patchset to the 3.2.19 kernel, it's available from https://github.com/grigo...
by bootc
Wed Jun 13, 2012 8:57 pm
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

dom wrote:I've been meaning to a add a mailbox based get/set property machanism that could handle this (and also cope with changing clocks from ARM).
Being able to query and/or change clocks from Linux on the fly would be a very nice feature. :-)
by bootc
Wed Jun 13, 2012 11:58 am
Forum: General discussion
Topic: SD Card performance in R-Pi onboard slot
Replies: 291
Views: 169362

Re: SD Card performance in R-Pi onboard slot

dom wrote:init_emmc_clock now defaults to 50Mhz, so config.txt entry is not required.
Is there a way the kernel can query such things as clocks? Strikes me if people update the firmware but not the kernel you'll have a lot of non-booting Raspberry Pis...
by bootc
Fri Jun 01, 2012 6:58 pm
Forum: Camera board
Topic: Camera module! (And a picture of JamesH)
Replies: 431
Views: 166978

Re: Camera module! (And a picture of JamesH)

All I have to add is I'd really like to see a V4L2 interface, or at least some way of talking to the VideoCore that we could implement that. That means no closed-source userspace libraries and no floating point, please!

And yes, of course I'd be willing to help out with the implementation. :-)
by bootc
Fri Jun 01, 2012 5:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: /dev/ttyUSB0 as a serial link
Replies: 11
Views: 7160

Re: /dev/ttyUSB0 as a serial link

Does that mean you did change your /etc/modules or not?

If you did, try this instead of what you pasted above:

Code: Select all

ftdi_sio product=0xfc0d
by bootc
Thu May 31, 2012 8:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Kernel panic w/ PCF8563 I2C RTC & bootc kernel
Replies: 4
Views: 5929

Re: Kernel panic w/ PCF8563 I2C RTC & bootc kernel

Good news! Thanks for pointing out the bug :-)
by bootc
Thu May 31, 2012 8:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C interfacing SHT21 sensor
Replies: 11
Views: 16635

Re: I2C interfacing SHT21 sensor

Easiest thing to do would be to build a new kernel with CONFIG_I2C_DEBUG_CORE and/or CONFIG_I2C_DEBUG_ALGO and/or CONFIG_I2C_DEBUG_BUS enabled. They should give you a much better idea about what's going on. If you haven't yet got a logic analyser, I recommend the Open Bench Logic Analyzer from Dange...
by bootc
Thu May 31, 2012 4:01 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C interfacing SHT21 sensor
Replies: 11
Views: 16635

Re: I2C interfacing SHT21 sensor

Do you see anything in /var/log/kernel.log or dmesg that might be of any indication? Do you have a logic analyzer or scope you can connect to the i2c pins to check what's going on?

HTH,
Chris
by bootc
Thu May 31, 2012 11:26 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Add RS232 to GPIO
Replies: 6
Views: 5286

Re: Add RS232 to GPIO

Edit your /etc/inittab and comment out the line that mentions /dev/ttyAMA0. Then run

Code: Select all

telinit q
and check your process list to make sure there isn't a getty process running on that port. Then try your inputattach.
by bootc
Thu May 31, 2012 11:23 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Kernel panic w/ PCF8563 I2C RTC & bootc kernel
Replies: 4
Views: 5929

Re: Kernel panic w/ PCF8563 I2C RTC & bootc kernel

Can you please give this new kernel a try and see if you still get the error?

http://www.bootc.net/raspberrypi/linux- ... _armel.deb

HTH,
Chris
by bootc
Thu May 31, 2012 9:09 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Kernel panic w/ PCF8563 I2C RTC & bootc kernel
Replies: 4
Views: 5929

Re: Kernel panic w/ PCF8563 I2C RTC & bootc kernel

Ah, I can see a potential problem in my code that might cause this. Let me get a patch pushed out that should hopefully fix it.
by bootc
Mon May 28, 2012 7:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Controlling a 595 using SPI from Python (working)
Replies: 3
Views: 6205

Re: Controlling a 595 using SPI from Python (working)

sinneb - you shouldn't need to be root; you should be able to chown the /dev/spidev0.X device nodes to a non-root user and then use them as said user. df8ms - my kernel has a driver for the Broadcom SPI peripheral, and transfers are done in interrupt mode for minimum CPU usage. My kernel also has a ...

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