Yes, I saw that. I decided it was a secret message and sent it on just in case.
Gerald On Wed, Mar 23, 2016 at 4:20 PM, <[email protected]> wrote: > 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. > -- Gerald [email protected] http://beagleboard.org/ [email protected] -- 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.
