I think the 3.3V you are connecting to is an output from the BBB look at U4 on the schematics, this is an LDO (LowDropout Regulator) I think connecting an external supply to that point could damage U4 on the BBB. You really want to input the power on the VDD_5V input the feeds the Texas Instruments Power Management chip on the BBB.
I would make sure that the Analog device IC has the output TX connected to the TX on the Ext. Board and the input RX to RX. I wish I had a nickel for every time I saw the DTE (Data Terminal Equipment) and DCE (Data Communications Equipment) swapped. It would be helpfull to probe the RX and TX line to see if there is activity on it using a logic analyzer or o-scope. This will let you verify the TX/RX and baud rates of the two devices. I did not have to change any configuration or enable anything to get the UARTS working using Bonescript commands on my two Rev C BBB's. I have a simple HTML/Java app that you can point to from Chrome to send out data bytes on the UART if you want that let me know, I haven't gotten to the receive part of my app yet. I am probably less experienced than you with software so this is the only way I got the UARTs working. -- 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.
