RTEMS on Beaglebone Black

Mr. Andrei Chichak groups at chichak.ca
Wed Jul 29 05:42:11 UTC 2015

> On 2015-July-28, at 23:31, Angelo Fraietta <newsgroups at smartcontroller.com.au> wrote:
> I just tried writing to the pins using the methods in the interrupt example
> What is very strange is that pin P9-15 toggles whether I write to GPIO1_16 or GPIO2_0, which may be why the read is not correct on it
> So in short, 
> I found that GPIO1_0 to GPIO1_3 did not read or write
> I found that GPIO1_30 and GPIO1_31 did not read or write

All routed to the eMMC chip U13. It is strange that GPIO1_4 through 7 work, perhaps the eMMC has been programmed in 4-bit mode.

> I found that GPIO0_4 and GPIO0_5 did not read or write
Connected to I2C board id chip U7

> P9-15 writes whether writing to GPIO1_16 or GPIO2_0

Yes, this makes sense. According to the schematics, 1_16 and 2_0 are wire-or-ed together with R160 and R161 and routed to P9-15.

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