2013/12/24 Charles Steinkuehler <[email protected]>: > Actually, VDD_5V is raw 5V power, connected directly to the DC power > jack. It is absolutely possible to power the BeagleBoard this way, and > I have several capes that do so and work just fine (the BeBoPr and K9) > powering the 'Bone via VDD_5V.
I see at http://elinux.org/Beagleboard:BeBoPr_Cape that 3.3v signals are also used by this cape. I guess they're used as output after powering through VDD_5V de board. > > The LED behavior likely indicates something is going wrong with booting > the operating system. The easiest way to debug these issues is with a > serial port cable, so you can see what's happening. As a guess, you may > be tying some other pins (specifically the LCD_DATA lines) to circuitry > and messing up the AM335x boot process. By changing the values on these > signals at reset, you can determine if the CPU should boot from eMMC > flash, SD card, ethernet, USB, serial, etc., so messing this up can > easily result in a system that won't boot. > Nope, I'm connecting only GND and VDD_5V for testing, no other connections are made to the board. > Double-check the LCD_DATA lines, and get a serial debug cable so you can > see what's going on. I'll try to get a serial cable trying to see anything, but the board powers down in 5 or 6 seconds (at least the power led does it), so I don't think I'll have time to check it. Thanks for your advices. José L. -- 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/groups/opt_out.
