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Have a RIoTboard question?  Ask the expert, John McLellan

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John McLellanJohn McLellan
John McLellan is a hardware hacker, maker, and embedded systems guy with more than 10 years semiconductor experience at Freescale.
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  • Hi,

    I have installed Linux in the RiotBoard.

    i would like use UART's in Expansion Port (UART3, UART4 and UART5)

     

    I have found :

    - UART3 on / dev/ttymxc2

    - Debug port on /dev/ttymxc1

     

    I don't know where is connected /dev/ttymxc0.

     

     

    Where is dev files of Serial port : UART4 & 5 ?

  • in reply to Former Member

    Quickly checked the RIOT kernel code, only UART 0,1,2 are initialized.  You need rebuild the Kernel to use 4 & 5.

  • in reply to xw024

    Hello, I'm also strugling with UART's. Is it possible for you, to write some guide where to find and how to modify kernel code to get working UART 4&5? I'm not an kernel expert so I would be glad to have some guide for that. Thank you very much.

  • in reply to Former Member

    Hello Marek, Enable UART 4,5 need first make sure their pins/pads are not MUX for other use on the RIOT design (checking the Schematic). If they are clear, you need add their pads definition in header file board-mx6dl_riot.h and add UART 4,5 init in file board-mx6q_riot.c. They both in the folder /linux-imx/arch/arm/mach-mx6/ if you fellow the UM. The current UART init looks like this in board-mx6q_riot.c file

     

    static inline void mx6q_riot_init_uart(void)

    {

      imx6q_add_imx_uart(0, NULL);

      imx6q_add_imx_uart(1, NULL);

      imx6q_add_imx_uart(2, NULL);

    }

     

    You may first build your own kernel image without any change and test on the RIOT to check it works before add more UART. I'm try to porting something else on RIOT. I will try the UARTs later if you still on it. Post a update if you get 4 and 5 working.

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  • in reply to Former Member

    Hello Marek, Enable UART 4,5 need first make sure their pins/pads are not MUX for other use on the RIOT design (checking the Schematic). If they are clear, you need add their pads definition in header file board-mx6dl_riot.h and add UART 4,5 init in file board-mx6q_riot.c. They both in the folder /linux-imx/arch/arm/mach-mx6/ if you fellow the UM. The current UART init looks like this in board-mx6q_riot.c file

     

    static inline void mx6q_riot_init_uart(void)

    {

      imx6q_add_imx_uart(0, NULL);

      imx6q_add_imx_uart(1, NULL);

      imx6q_add_imx_uart(2, NULL);

    }

     

    You may first build your own kernel image without any change and test on the RIOT to check it works before add more UART. I'm try to porting something else on RIOT. I will try the UARTs later if you still on it. Post a update if you get 4 and 5 working.

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