Skip to main content
H
harry123
Graduate II
September 25, 2024
Solved

Nucleof446 UART

  • September 25, 2024
  • 3 replies
  • 3878 views

Hi

  • I am trying to communicate between arm processor and nucleo board through uart 
  • The processor has a type b usb , to interface with computer.
  • For the same usb I am connecting my Nucelo board through usb type B mini and sending the data through it
  • When i connect the device to laptop/computer the communication happens, and when i connect nucleo the communication does not happen.
  • Im giving both power supply and uart communication from usb cable.1.jpeg
    This topic has been closed for replies.
    Best answer by Andrew Neil
    @harry123 wrote:
    •      Will the same STM UART transmit receive code that is used for VCP  i.e teraterm/putty works for AT91SAM

    The whole point of the standard USB device profiles is that the device is completely oblivious to the nature of the host - it neither knows nor cares whether the host is a PC or a Mac or some  sort of Linux or whatever.

    Similarly the Host is completely oblivious to the nature of the device - it just sees a standard Virtual Serial Port.

    So the question is: does your SAM board support a VCP?

    You can easily find out by just plugging it in - does a VCP device appear?)

    It will probably appear as a /dev/ttyACMx (maybe a /dev/ttyUSBx) ::(:(:(

    https://community.st.com/t5/stm32-mcus-products/communication-between-nucleo-f411re-and-raspberry-pi-using-st/m-p/721528/highlight/true#M261168

    3 replies

    A
    Andrew Neil
    Super User
    September 25, 2024
    @harry123 wrote:
    • I am trying to communicate between arm processor and nucleo board through uart 
    • The processor has a type b usb , to interface with computer.

    So this "ARM processor" has a USB Device connection.

    The CN1 USB connector on your Nucleo board is also a USB Device connection:

    AndrewNeil_0-1727255027976.png

     

    You cannot connect two USB Devices together - a Device can only connect to a Host.

     

    @harry123 wrote:
    • When i connect the device to laptop/computer the communication happens

    That's because the computer is a Host.

      A
      Andrew Neil
      Super User
      September 25, 2024

      What is CN2?

      Is that a USB Host port?

      AndrewNeil_0-1727255369704.png

       

        H
        harry123Author
        Graduate II
        September 25, 2024
        •  YES That USB type A port is used to interface a printer
        • and another port USB type is is used to interface with a computer.
        • And I want to have communication between Nucleo and Processor ( I have attached pdf of processor) .
        A
        Andrew Neil
        Super User
        September 25, 2024
        @harry123 wrote:
        • I want to have communication between Nucleo and Processor

        The CN1 USB connector on your Nucleo board is a USB Device connection for the Virtual COM Port (VCP) in the ST-Link:

        https://community.st.com/t5/stm32-mcus-products/communication-between-nucleo-f411re-and-raspberry-pi-using-st/m-p/721571 

        To use that, you must connect it to a USB Host port. That's the way it works.

        Instead of using this USB connection, could you use a direct logic-level connection to one of the UARTs on your ARM9 board?

        AndrewNeil_0-1727259278863.png

         

          A
          Andrew Neil
          Super User
          September 25, 2024

          There's not enough information in that brief document - you need a more detailed technical manual.

          But this Mini6045 board seems to be obsolete and no longer supported - so no idea where you'll find that.

           

            Terms & ConditionsAccessibility statement