Dear Niv, dear all, thanks for this great tutorial. I think this is exactly what people need to start with GPIO on BBB.
Just one note for beginners: To make & make install the dts file you will need some tools. There is a script available (thanks to Robert Nelson - again!!!): wget -c https://raw.github.com/RobertCNelson/tools/master/pkgs/dtc.sh Then just use the 'dtc.sh' script and all required tools will be installed. [ I have just tried to enable the DCAN1 interface and it works like expected. Open the file 'am335x-boneblack.dts', uncomment the two includes regarding 'can1', make, make install, reboot. When you then use ifconfig -a the interface will show up! ] Thanks Niv, Thanks Robert! Best regards, Marco Am Mittwoch, 14. Januar 2015 00:10:50 UTC+1 schrieb niv...@gmail.com: > > I set out to connect a water flow sensor to my bbb. > The water/gas sensor is " G3/4 Water Flow Sensor Switch Hall Effect Flow > Meter Counter 1-60L/min" > When water flow in the given direction you will get a pulse. 5.5 pulses , > mean 1L passed the sensor. > > You connect one pin to +5V one to GND and the middle to a GPIO. > This GPIO pin should be pulled up to the "high" voltage , the GPIO is set > to. in our case its 3.3V > So I wanted to use the on-board GPIO pull-up feature. > > RobertCNelson maintains a kernel for the BBB and he released the > 3.19-rc3-bone2. This kernel has a new way to define the device tree. > You need to define the GPIO to use a pull-up using the device tree. > I first got the debian image and flashed the BBB. Here is how > https://blog.fite.cat/2014/03/upgrade-beaglebone-black-to-debian-7-4-and-kernel-3-14/ > > I then installed the new kernel from here: > https://rcn-ee.net/deb/jessie-armhf/v3.19.0-rc3-bone2/ > > I then got dtb-rebuilder from > https://github.com/RobertCNelson/dtb-rebuilder/tree/3.19.x: > git clone https://github.com/RobertCNelson/dtb-rebuilder.git > > > > I then used the example by Derek Molloy to define the GPIO pullup : > https://github.com/derekmolloy/boneDeviceTree/blob/master/overlay/DM-GPIO-Test.dts > > I got this file and saved it under the directory of dtb-rebuilder under > the sub-dir src/arm as DM-GPIO-Test.dtsi > I then edit the file am335x-boneblack.dts and add this line at the end of > the file: > > #include "DM-GPIO-Test.dtsi" > > > > Then from the dtb-rebuilder directory I ran, make , then sudo make install. > I reboot the BBB, and the GPIO is now pulled up. > > Thanks Robert Nelson, > Niv > -- 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.
