Hi Thank you for your reply, and the book's title! I checked table of contents of the book. Maybe, The Chapter 6 is that? I have experiences to control GPIO by python, and configure the device tree's defualt setting, write to value&direction file. I changed the GPIO Pin setting of device tree file to out&High for the LED turn on when bbb is powered on. But I can't find the method to turn off the LED in a few seconds. I tried to write python script to turn off the LED, and Systemd run the service script( using the After setting is "generic-board-startup.service ). but the timing is over 1minutes from the bbbw is powered on! I'm looking for the information of "as soon as bbb is powered on". I'm not familiar with embedded Linux. In particular, I have little idea about the behavior of driver-related programs. I'm wondering if the driver's program should do this.
2021年1月6日水曜日 22:39:14 UTC+9 [email protected]: > Hi! > Yes! I'm pretty sure that the Derek Molloy's "Exploring BeagleBone: Tools > and Techniques for Building with Embedded Linux" book has the examples that > you are looking for in various programming languages. > > El mié., 6 de ene. de 2021 10:16, BBBW User A <[email protected]> > escribió: > >> >> Hi everyone. >> >> I'm BBBW user. >> Could you tell me below question. >> >> Is there a wai to turn on the GPIO Controlled LED for a few seconds as >> soon as the bbbw is powered on, like user leds? >> and How to do it? >> >> Regards, >> >> -- >> 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/364a2d6d-897f-4c72-99e0-4008f5504c77o%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/364a2d6d-897f-4c72-99e0-4008f5504c77o%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- 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/a06b8f08-80c5-432a-af9d-45d1e1042222n%40googlegroups.com.
