On 5/15/2014 7:25 AM, [email protected] wrote: > I alread tried to ask this question but it seems my posting got lost, so > once again: > At > http://elinux.org/Beagleboard:Cape_Expansion_Headers#Full_Headers_with_8_Modes > > the expansion header pinout of BBB is listed. For every pin that > corresponds to an output of MPU a single row with up to 8 entries is > listed. Every of these up to 8 functionalities can be choosen via pin mux > of processor. > > But for P9 pin 41 and 42 situation is different, they are named 41# and 42@ > and show _two_ rows with different, conflicting functions. So...what does > it mean? How can I choose one specific function there?
Look at the schematic. There are two pins from the CPU connected to each P9.41 and P9.42. It is up to your software and device tree to insure that these functions do not conflict (ie: do not enable the two pads tied together as outputs driving different values!). Typically, you will disable one of the pads (or set it as an input) and use the other one. -- Charles Steinkuehler [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.
