Hi Karina, I agree with the posts on the power consumption. Depending on the USB devices you are using you might be overloading the power. I've experienced this when using SPI devices and USB devices in conjunction. HP makes a very cheap 4 port USB hub with a 2A power supply that you can by through MicroCenter.com for about $5. This fixed my problem. You can probably pull datasheets on all your devices and add up the MAX mA draw. I think the max output on the USB ports for BeagleBoard Black are around 600mA. Some USB devices like a WiFi and Bluetooth adapters in conjunction will consume most of this. I noticed an issue when I actually tried to access my SPI device (another 2.4ghz radio) it would cause USB failure. One last little thing of note. Make sure you're brick that your USB is powering the BeagleBoard with is rated for at least 1A(2A is better for many devices). Hope this helps.
Schuyler Note to the moderator - Sorry I tried to post this and sent it blank :) On Monday, March 21, 2016 at 10:49:32 PM UTC-6, Karina wrote: > > Hi, > > I have a unpowered 2-port USB hub that I have connected to the BeagleBone > Black (Rev C). I have two (serial over ) USB devices connected to the two > port of the USB hub. They are are not powered to begin with. When i power > up the Beagle Bone, i see the USB hub listed in the output for 'lsusb'. Now > i power up the two USB device hanging off the USB hub. But i do not see the > USB devices listed in the output of 'lsusb'. Also, there is no /dev/ttyUSB* > file. For my project, it wold be ideal for the beagle bone to be powered up > before these USB devices. Any idea on what i have messed up or missed? > > I have verified that if i connect the USB device directly into the USB > port on the beagle bone black, then I can power the USB device after the > beagle bone is powered up and it shows up in the output of 'lsusb' and i > can control the device. > > Here are some more specifics about my setup. > 1. I am using the beagle bone black Rev C board. > 2. I am running Debian linux (jessie v 8.3) on the beagle bone black . The > version of the linux kernel is v3.8.15 -bone 71. > 3. I am powering the beagle bone with the power supply ( instead of over > the USB connector for etherent over USB). > > Thanks, > Karina > > -- 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.
