BBB Enable UARTs

[lucent.p...@gmail.com]

Hi,

We've been using the BBB for a year or so now do act as webserver and a gateway to a zigbee based network. We have developed a cape that contains a zigbee device that we can easily communicate with through one of the UARTs.

We have had a working setup using the old April 2014 image that the BBB came shipped with, this needed to be brought up to date and I have been developing new software with the January 2016 image and a USB based zigbee device. 

My trouble is, now I have come to test the software using the cape I cannot seem to enable the UARTs.

In my 2014 version I followed the instructions on this page: http://beaglebone.cameon.net/home/serial-ports-uart and this work successfully.

After "some" digging I found out about the config-pin application here: https://github.com/cdsteinkuehler/beaglebone-universal-io and have checked the help page of the app. I had hoped this would solve the problem and tried to set the use of pins I wanted (to enable UART5) however I got an error message that there was no pinmux file. Having re-read the above page I don't have half the directory structure that the instructions talk about, namely no ocp.* in /sys/devices/, so I'm completely stuck.

I just need to know how to enable UART5, I'm a fairly experienced linux user and very experience programmer, though my knowledge of Linux kernal stuff is terrible.

I also have a strange setup in my /dev/ for ttyO* I had expected there only to be ttyO0 as that was the only port enabled by default, is that still the case?

/dev# dir -l ttyO*

lrwxrwxrwx 1 root root 5 May 25 14:30 ttyO0 -> ttyS0

lrwxrwxrwx 1 root root 5 May 25 14:30 ttyO1 -> ttyS1

lrwxrwxrwx 1 root root 5 May 25 14:30 ttyO2 -> ttyS2

lrwxrwxrwx 1 root root 5 May 25 14:30 ttyO4 -> ttyS4

My Linux knowledge is also failing me here are these showing symbolic links? I'm not sure if this is part of why I can't use the UARTs or something separate.

Sorry for the long post with a couple of problems in it.

Thanks

Lucent 

[William Hermans]

So the difference you're running into is the cape manager path naming I bet. But here: http://www.embeddedhobbyist.com/2015/09/beaglebone-black-updating-device-tree-files/

Read that, but you should not need worry about compiling the DTS files for kernel 4.4.x. But you can tell if they're installed already by listing the contents of /lib/firmware/. Obviously if the directory does not exist, or it is empty, you need to either download the device tree overlay package, or build your own as I describe from the beginning of the link above.

Let me know if that's enough information or not, and I'll answer back answers to your questions . . .

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[William Hermans]

Additionally I just read cameron's page there and . . .

william@beaglebone:~/dev$ cat /boot/uEnv.txt
...

##Example v3.8.x
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=

##Example v4.1.x
#cape_disable=bone_capemgr.disable_partno=
#cape_enable=bone_capemgr.enable_partno=
 ...

You're seeing the difference here ? But also I have no personally hands on tested this recently but ##Example v4.1.x should work for 4.4.x kernels too.

[William Hermans]

william@beaglebone:~/dev$ apt-cache search cape |grep overlay
bb-cape-overlays - Device tree overlays for Beaglebone.

The package above is the package you're wanting to download, if your /lib/firmware is not populated, or is missing all together.

Sorry for the multi posts . . . but I'm pretty busy on my own ;)

[lucent.p...@gmail.com]

Thank you so much for your time!

It's working now, I feel so stupid for missing it, it was the second post that did it, and so quickly.

I was still trying to get my head round all the info in the first when I when the second came in - so I tried that quickly

Can't thank you enough!

Lucent

[William Hermans]

Thank you so much for your time!

heh, no problem. My comment yesterday about being busy was not meant in that way however. I just meant, that I'm busy doing my own thing, and hence is what is mostly on my mind. So, when I'm busy, and answer a post like yours, I tend to make multiple posts as additional things occur to me . .

It's working now, I feel so stupid for missing it, it was the second post that did it, and so quickly.

I was still trying to get my head round all the info in the first when I when the second came in - so I tried that quickly

Can't thank you enough!

Lucent

Awesome, glad that worked for you.

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[akshath.va...@vit.ac.in]

Hi I am facing the same issue I tried downloading the bb.org-overlays from the github repository ( https://github.com/beagleboard/bb.org-overlays ) but It did n't work for me any idea why?