@Beagle Bone How did you end up resolving the error? I followed the exact same set up as you but still getting Invalid arguments error?
On Thursday, June 8, 2017 at 7:59:03 AM UTC-4, Beagle Boner wrote: > > Hi, > > i´m using the latest Debian Image an I´m trying to set an external RTC as > a hardwareclock for my BBB. I have a different RTC module (PCF8563) but > basicly I stick to the following manual: > > https://learn.adafruit.com/adding-a-real-time-clock-to-beaglebone-black/set-rtc-time > > What I dont understand here is the following: > > The author sets the ds1307 as a new i2c device with the command: > > echo ds1307 0x68 > /sys/class/i2c-adapter/i2c-1/new_device > > In the next step he can already access the new rtc1 device. > > hwclock -r -f /dev/rtc1 > > Why is that? How does the system know that the new i2c device connected is > a RTC and how to access it. Is there a preinstalled driver for DS1307? > > > > According to the manual I did the following: > > echo pcf8563 0x51 > /sys/class/i2c-adapter/i2c-2/new_device > > My PCF8563 is getting recognized as rtc1 (not sure why - I havent > installed any drivers?) > > When I try to access > > hwclock -r -f /dev/rtc1 > > I just get > > hwclock: ioctl(RTC_RD_TIME) to /dev/rtc1 to read the time failed: Invalid > argument > > Does anyone have some hints on that? > > Cheers. > > > > > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/459da9d0-f04e-437a-8843-3a640df8cad6%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
