You may need to write code for the PRU, if the timing is critical. But I see no reason why it shouldn't be possible to make this work on the BBB.
> On Jan 12, 2015, at 14:22 , Rex Byrns <rex.by...@gmail.com> wrote: > > I have been trying to get a AM2315 I2C Hygrometer to work with my BBB. The > datasheet 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 > > In case you are wondering, yes I have configured the i2c bus. I can get > several devices to work well. -- Rick Mann rm...@latencyzero.com -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
