i2c dose not work

Hi

has anyone got the I2c bus run to?
device and driver are running.
[21.718100] i2c-core: driver [dummy] registered
[23.445605] i2c / dev entries driver
[23.449343] i2c-core: driver [dev_driver] registered
[23.454561] i2c i2c-0: adapter [mv64xxx_i2c adapter] registered
[23.460720] i2c-dev: adapter [mv64xxx_i2c adapter] registered as minor 0

sensors-detect to find mv64xxx_i2c adapter and scans.
But at the pins is no signal. Tested with LOGIC PORT.
8 = TW_SDA
9 = TW_SCK

more here http://www.mikrocontroller.net/topic/187115

best regards



Edited 1 time(s). Last edit at 09/10/2010 05:57PM by nevtag.

es ist im Deutsch, und Google Chrome does not do a great job with the translation :-(

Yes, german forum, but pictures and code can help ;-)

I resolved the problem.

In the kernel init function sheevaplug_init
the MPP Ports should be set.
So the kernel know which outputs should be at the ports.

static unsigned int sheevaplug_mpp_config[] __initdata = {
MPP0_SPI_SCn,
MPP1_SPI_MOSI,
MPP2_SPI_SCK,
MPP3_SPI_MISO,
MPP6_SYSRST_OUTn,
MPP7_PEX_RST_OUTn,
MPP8_TW_SDA,
MPP9_TW_SCK,
MPP29_GPIO, /* USB Power Enable */
MPP46_GPIO, /* LED green */
MPP47_GPIO, /* LED orange */
0
};



Edited 1 time(s). Last edit at 09/11/2010 12:25PM by nevtag.

I'll be brushing up my German skills as soon as I get my spare Dockstars. I see they are also working on a battery backup for the RTC.
Thank you for the lead!!!!

Gerrit

What can the i2c support be used for on the DockStar?

With Debian or Ubuntu stupid use is temperature mesurement with LM75 or higher level control functions like home automation, control blinds or ventilation.
You can use the board for much more than stupid bring HD to the Network.

nevtag Wrote:
-------------------------------------------------------
> With Debian or Ubuntu stupid use is temperature mesurement with LM75
> or higher level control functions like home automation, control blinds or ventilation.

All these require hardware mods to the board, right? Are there any built-in capabilities that become available when i2c is enabled?

Do you have any pointers to home automation mods? I was planning to use a USB-to-serial cable and just control the DTR signal from software (to control some relays in a home theater).

yes and no
you can use the internal i2c, than you must mod the board with wires or you use i2ctinyusb

take a look to i2c_io.pdf

http://dworkin-dmx.de/DMX_I2C.htm - up to 64 relays

http://www.pickeringtest.com/pdf/SIMRC%201000D.pdf