Bad things happen when I try to power the beaglebone through the header pins. I'm doing this by connecting an external 5V supply to header P9 pin 5, and ground header P8 pin 1.
I have the pull-downs for GPIO1_12:15 enabled in software. I believe this is done correctly: I've verifying that the pull-downs overcome a large external resistor pulling up, and that enabling the internal pull-up instead works as expected (my interface doesn't support no-pull so I can't test that). The IO pins stay right near 0V when I power the bone through the jack. When I power it through the the header as described above, the pins float up to 0.1 V or more, sometimes high enough to cause spurious high reads on the pins. I've also tried connecting header P9 pin 6 to 5V as well (no change). The GND pins appear to be internally connected (as expected). I'm on a BBW Rev. A6. Ideas? Success stories? Known problems? -- 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.
