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Getting UART working with BB-View

Former Member

Hello

I used to use the original circuitco beagleboardtoys.com 7" inch display and I didn't have any problems of getting the UART working on it.

When I connect BeagleBone Black to the BB-View Screen, I cannot get the UART4 ( p9_11 RxD & p9_13 TxD) working. In the datasheet for the BB-View It says that pins that should have UART4 are either not-connected or assigned to another set: J2_11 USER3, GPIO3; J2_13 NC, NC.

 

I tried doing: echo BB-UART4 > /sys/devices/bone_capemgr.*/slots. Was expecting UART4 to be working (even: cat  /sys/devices/bone_capemgr.*/slots, was showing UART4 to be activated), but couldn't get anything out of UART.

 

My first guess was that at fault is am335x-boneblack.dtb & am335x-bonebalck-lcd7.dtbo device tree overlay that I put (installed) on the board for BB-View Screen to work. Now I suspect that it's uImage file that changed all configurations on the board and made the UART inaccessible.

 

If anybody had the same problem of not getting the UART working, could you please guide me how to get UART working with the BB-View 7" inch touch-screen.  

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  • I have the same issue, but I think that the problem is that UART4 needs P8_35 and P8_33 (CTS and RTS) and they are used by the BBView.

     

    From UART 1 to UART5 at least one pin is being used by the BBView, so maybe we can't get BBView and UART working at the same time. I'm still working on this, so if I manage to get a solution I will reply you again.

  • in reply to Former Member

    I have the same problem as you two have. Can't get UART2 working on latest Debian with BB View 7".

    I tried using UART4 also but couldn't get it to work either. Exporting BB-UART4 worked though (unlike for BB-UART2 which had a conflict with BB-BONELT-HDMI).

    Miguel, have you tried to disable BB-BONELT-HDMI in uEnv.txt? I read in another forum that if you do that, BB-BONELT-HDMIN will be loaded instead which doesn't conflict with BB-UART2.

     

    I've also tried the TI SDK and got UART2 to work fine, but then I couldn't get I2C to work!

     

    Have anyone found a solution to this?

  • in reply to Former Member

    Yes I did, but now I have removed the BB-View from my project, so it might take a while since I work on a solution for that.

     

    Thank you anyway.

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