You need to do echo 60 > export
Before cd gpio60 On Dec 9, 2014 2:32 AM, <janszymanski12...@gmail.com> wrote: > A good tutorial here: > > http://derekmolloy.ie/gpios-on-the-beaglebone-black-using-device-tree-overlays/ > simple example: > cd /sys/class/gpio > cd gpio60 > echo 60 > export > echo out > direction > echo 1 > value > > good luck > Jan > > > > > > > On Tuesday, December 9, 2014 1:41:10 AM UTC+11, Hemant Kapoor wrote: >> >> Hello All, >> >> I am a newbie to Linux and trying to figure out how device tree overlay >> works... >> >> So after googling for many days, I came up with below device tree: >> >> /dts-v1/; >> /plugin/; >> >> / { >> compatible = "ti,beaglebone", "ti,beaglebone-black"; >> >> /* identification */ >> part-number = "MY-LED"; >> version = "00A0"; >> >> /* state the resources this cape uses */ >> exclusive-use = >> /* the pin header uses */ >> "P9.12", /* GPIO*/ >> /* the hardware ip uses */ >> "gpio0"; >> >> fragment@0 { >> target = <&am33xx_pinmux>; >> __overlay__ { >> bb_mygpio_pins: pinmux_bb_mygpio_pins { >> pinctrl-single,pins = < >> 0x870 0x07 /* >> output mode | MODE7, see Pin_Configuration.pdf in BBB */ >> >; >> }; >> }; >> }; >> >> fragment@1 { >> target = <&ocp>; /* not sure why it is not gpio0 >> */ >> __overlay__ { >> status = "okay"; >> pinctrl-names = "default"; >> pinctrl-0 = <&bb_mygpio_pins>; >> }; >> }; >> }; >> >> >> I was able to "build" the dtc and generated MY-LED-00A0.dtbo >> >> I then copied the MY-LED-00A0.dtbo to /lib/firmware >> >> Then i echoed it to slots: >> echo MY-LED > $SLOTS >> >> and cat $SLOTS gives me below result: >> >> root@beaglebone:/lib/firmware# cat $SLOTS >> 0: 54:PF--- >> 1: 55:PF--- >> 2: 56:PF--- >> 3: 57:PF--- >> 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G >> 5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI >> 6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN >> 9: ff:P-O-L Override Board Name,00A0,Override Manuf,MY-LED >> >> By looks of this, MY_LED seems to be loaded... >> >> >> The main confusion is how can I use MY-LED? >> Where are the files for MY-LED present? >> >> Any help or guidance is much appreciated. >> >> -- > 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. > For more options, visit https://groups.google.com/d/optout. > -- 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. For more options, visit https://groups.google.com/d/optout.
