Hi Robert, On Wednesday, 10 July 2019 05:32:06 UTC+3, Robert Heller wrote: > > OK, I have designed a cape, a Quad Stallmotor controller with/sense, which > uses 8 GPIO lines: four as outputs to drive a "stallmotor" type of switch > motor for model railroad turnouts [switch tracks] and four inputs to sense > the current state of the stallmotor (the state of the switches). > > The I/O pins I am using are: > > // GPIO0_7: P9-42 > // GPIO1_6: P8-3 > // GPIO1_28: P9-12 > // GPIO1_7: P8-4 > > > // GPIO1_16: P9-15 > // GPIO1_17: P9-23 > // GPIO3_21: P9-25 > // GPIO3_19: P9-27 > > I am testing the cape and I having some issues and wanted to check if > there > are problems with using these pins, partitularly GPIO1_6 on P8-3 and > GPIO1_7 > on P8-4 and I am slightly confused about GPIO0_7 on P9-42 (P9-42 seems to > be > listed as P9-42a and P9-42b). > > I am getting kernel error messages relating to mmcblk1 (I am not using > mmcblk1 > and I have zeroed it). I *think* this might be because what is "wired" to > P8-3 and P8-4. > > Should I be looking at redesigning my cape to use other GPIO lines? > > -- > Robert Heller -- 978-544-6933 > Deepwoods Software -- Custom Software Services > http://www.deepsoft.com/ -- Linux Administration Services > hel...@deepsoft.com <javascript:> -- Webhosting Services >
I recommend Derek Molloy's GPIO tables for figuring out which pin is used for what. Out of experience I would recommend not using for GPIO a pin which has anything written in the "Notes" column. https://github.com/derekmolloy/boneDeviceTree/blob/master/docs/BeagleboneBlackP8HeaderTable.pdf https://github.com/derekmolloy/boneDeviceTree/blob/master/docs/BeagleboneBlackP9HeaderTable.pdf -- Kind regards, Tarmo -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1b015b3d-e82a-44e6-a00f-5cf90677a84c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
