On Sun, Jul 31, 2016, at 10:44 PM, Charles Steinkuehler wrote:
> On 7/31/2016 9:20 PM, John Kasunich wrote:
> >
> > 3) I successfully loaded it using input pin 803 (header P8, pin 3)
> >
> > loadrt hal_bb_gpio input_pins=803
> >
> > Jul 31 21:39:54 beaglebone msgd:0: hal_lib:522:rt memmapped gpio port 1 to
> > 0xb66a5000, oe: 0xb66a5134, set: 0xb66a5194, clr: 0xb66a5190
> > Jul 31 21:39:54 beaglebone msgd:0: hal_lib:522:rt pin 3 maps to pin 1-6,
> > mode 85
> >
> > Now it gets interesting.
> > I unloaded the driver:
> >
> > unloadrt hal_bb_gpio
> >
> > And tried reloading it with the same pin number, just as a
> > test before moving to a different pin number.
> >
> > loadrt hal_bb_gpio input_pins=803
> >
> > this time it didn't work
> >
> > Jul 31 21:40:25 beaglebone rtapi:0: rtapi_app_main(hal_bb_gpio): -1
> > Operation not permitted
> > Jul 31 21:40:25 beaglebone msgd:0: hal_lib:522:rt hal_bb_gpio: ERROR: pin
> > p8.03 is not available as a GPIO.
> > Jul 31 21:40:25 beaglebone msgd:0: rtapi_app:522:user
> > rtapi_app_main(hal_bb_gpio): -1 Operation not permitted
> >
> > That error message is printed when the "claimed" field
> > of the pin structure is non-zero. Those fields are set to
> > zero in beaglebone_gpio.h, and I expected that unloading
> > and reloading the module would reset them...
> >
> > I completely exited from HAL ("quit" at the halcmd prompt)
> > and then tried again loading multiple pins. Success.
>
> This looks like an actual bug...good catch! Could you open an issue
> on github so it won't get lost?
>
What is the bug? "claimed" fields retaining their value
over an unloadrt/loadrt cycle? Since they are arrays and
are initialized as part of the declaration, I don't see how
it can be a bug in the driver code.
What about the 0x803 as a control_offset value instead of
a multiple of 4? That sounds like a typo to me, I've never
seen a chip that had such a break in the pattern of I/O
addresses.
--
John Kasunich
[email protected]
--
website: http://www.machinekit.io blog: http://blog.machinekit.io github:
https://github.com/machinekit
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