gumstix

If I use the pins 23 and 24 as gpio to bitbanging would I still be able to use i2c?
In that case I think it will work (at a very low frequency) to set bit by bit like this:

set_bit ( value )
{
SCK = 1;
DATA = value;
DATA = 0;
SCK = 0 
}


From: mathias_kriebel@...
To: gumstix-users@...
Date: Wed, 23 Mar 2011 16:46:22 -0300
Subject: [Gumstix-users] non-i2c humidity sensor (SHT15)








Hello all,

Does somebody ever used a SHT15 humidity sensor (http://www.sparkfun.com/products/8257) ?
It is has a 2 wire interface but not compatible with i2c standard. The SCK line is pulled down on the breakout board.
The datasheet (http://www.sparkfun.com/datasheets/Sensors/Datasheet-humidity-sensor-SHT1x.pdf) says it can be used on the i2c bus, just switching the protocol.

How can I implement this protocol (without using a microcontroler) ?
How to synchronize the DATA and SCK lines (I'm using an Overo with Tobi) ? 


Thanks,
Mathias
 		 	   		  

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Hi,
I see that there is a ready sht15 driver in linux. I can see it on Overo by "locate sht15":

/lib/modules/2.6.34/kernel/drivers/hwmon/sht15.ko
/usr/lib/opkg/info/kernel-module-sht15.control
/usr/lib/opkg/info/kernel-module-sht15.list
/usr/lib/opkg/info/kernel-module-sht15.postinst
/usr/lib/opkg/info/kernel-module-sht15.postrm

Linux documentation (http://www.mjmwired.net/kernel/Documentation/hwmon/sysfs-interface) says that after modprobing the driver, there will be an entry at " /sys/class/hwmon/hwmon* ".
Then the reading would be done by the file " /sys/class/hwmon/hwmon*/humidity1_input ".

But after modprobing I couldn't find that entry. Does this works on Gumstix? 


Thanks,
Mathias