Unfortunately you might be out of luck. I'm not certain, but that sounds like a problem I had with a HIH6130 temperature sensor. I think the answer was basically you either need to bit-bang an I2C bus or do some kernel hacking to get the I2C bus to act appropriately. I wound up going with a different temperature sensor that worked without any hacking, since I wanted my project to work now, and not 6 months from now.
Here's a link to the original discussion: https://groups.google.com/forum/#!topic/beagleboard/lRWF8rADp0Y On Thursday, January 8, 2015 10:54:25 AM UTC-5, Rex Byrns wrote: > > Going crazy trying to get a AM2315 I2C Hygrometer to work with my BBB. The > datasheet <http://www.adafruit.com/datasheets/AM2315.pdf> Says that I > have to wake up the sensor before using it. I have tried writing to it > once, then waiting the 800us it wants. I then sent the write command to > tell it to send me the 4 bytes required to calculate the temp and RH. > Nothing is working right, played with the timing, tried several libs etc. > > Out of desperation I searched more and found this explanation of the > problem a user had with this sensor and a Raspberry PI. > > on page 3 - "The AM2315 device requires a standard SMBus write function to > request the data, but then simply writes the data response immediately on > the i2c bus. It does not bother waiting for an SMBus formatted read request" > > He decided to use a library called quick2wire that is not for the BBB - > and he concluded this --> > > on page 4 - "So, why did the Quick2Wire library work and the SMBus library > did not? Simple. The Quick2Wire library has a function that allows a direct > read off the i2c bus without sending a command code > (i2c.reading(AM2315_addr, no_bytes)." > > Any suggestions on how I deal with this? I am working in c++ at the > moment, but I will use anything will get it done. > > The full article quoted above is here > <http://sopwith.ismellsmoke.net/wp-content/uploads/2014/03/PI-How-To-AM2315.pdf> > > Thanks in advance. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
