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by MozisII
Sun Oct 06, 2013 3:30 pm
Forum: Automation, sensing and robotics
Topic: MCP23S17 as I/O expander?
Replies: 19
Views: 12745

Re: MCP23S17 as I/O expander?

Hello, Does somebody can explain me how to make equivalent procedure of the modprobe gpio-mcp23s08 for the SPI version and then SPI bus. I can't find the way do attach the driver to the spi bus. Thanks there are kernel drivers for the spi and i2c versions of these chips under drivers/gpio, you'll ha...
by MozisII
Mon Apr 08, 2013 8:54 am
Forum: General discussion
Topic: 5V power supply tolerance on A model ?
Replies: 8
Views: 2488

Re: 5V power supply tolerance on A model ?

You're right the label is VDD_BATx. I think also that BCM is build to work with a single cell lithium ion battery. With a 'A' model on an embedded system that don't need HDMI nor USB it would be interesting to know the power source limit on '5V' input. There is two points that are concerned on '5V' ...
by MozisII
Sun Apr 07, 2013 4:39 pm
Forum: General discussion
Topic: 5V power supply tolerance on A model ?
Replies: 8
Views: 2488

5V power supply tolerance on A model ?

Hi,
The 5V on BCM seems to be marked as Bat 5V, this lets think that 5V may be not 'regulated'.
Then my question is on 'A' model (without 5V USB/Ethernet chip) what is the 5V voltage tolerance for the BCM ?

Thanks
by MozisII
Sun Mar 17, 2013 11:40 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: FTDI USB Serial Hangs
Replies: 138
Views: 161842

Re: FTDI USB Serial Hangs

There is no problem on R model (FT232RL), only on 'B' one (and 'A' ?) .
Anyway the problem as been solved by P33M see at http://www.raspberrypi.org/phpBB3/viewt ... 0&p=311249
New firmware is available on the last kernel on https://github.com/raspberrypi/firmware
by MozisII
Sun Mar 10, 2013 10:34 am
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112214

Re: USB/serial converters (not very) broken on Pi

I've just tested on my 'B' model with and without external hub:
FT232M : OK
FT2232M : OK
Then thanks a lot P33M! :lol:
by MozisII
Wed Mar 06, 2013 10:51 am
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112214

Re: USB/serial converters very broken on Pi

Cool !
I will test it this WE. How did you force speed on a hub port ?
by MozisII
Mon Mar 04, 2013 8:40 am
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 22176

Re: Model A: How low can you go? (Power consumption)

@M33P My own concern is autonomous powered systems as solar or battery equipment then energy tariff is not the sames. There is 4 voltage levels and we have no informations on current consumption on each levels. Sure the head regulator efficiency impact all levels but final result is unknown. We need...
by MozisII
Thu Feb 28, 2013 2:15 pm
Forum: Advanced users
Topic: Model A: How low can you go? (Power consumption)
Replies: 34
Views: 22176

Re: Model A: How low can you go? (Power consumption)

Hi, I make some test on raspberry to quantify influence of underclock and overclock on Raspberry consumption. For ones interested in result you can take a look on http://moze.free.fr/blog/index.php?post/2013/02/Underclock-and-Overclock . Part of conclusion is that only core frequency have a big impa...
by MozisII
Mon Feb 18, 2013 2:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: FTDI USB Serial Hangs
Replies: 138
Views: 161842

Re: FTDI USB Serial Hangs

Hi, I also apply that patch but t doesn't fully solve the problem that is sometime I get only one toggle error and then running fine but generally I got also an infinite loop on toggle error. The problem occurs only when there is a usb hub (raspberry integrated or external) as reported on my post ht...
by MozisII
Mon Feb 18, 2013 2:55 pm
Forum: Troubleshooting
Topic: USB/serial converters (not very) broken on Pi
Replies: 162
Views: 112214

Re: USB/serial converters very broken on Pi

I apply toggle identification patch to my kernel to search about ftdi hang problem. I use ttyAMA0 device to monitor system and don't use ethernet (no ethernet cable). Toggle pbm depend on ftdi chips: FT232R, FT245R and FT2232M are OK FT232BM crash at first access and sometime keep working with only ...
by MozisII
Wed Jan 30, 2013 10:15 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: FTDI USB Serial Hangs
Replies: 138
Views: 161842

Re: FTDI USB Serial Hangs

Hi
Try with
FT232R : OK
FT245R: OK
FT2232M: OK
FT232BM: Fail as soon I open device
It's not related to ftdi_sio because I have the same problem with the ftdi2xx lib that use libusb.

Sylvain

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