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IWR1642: IWR1642 vital signal UART path

terry fang
Prodigy 170 points
Part Number: IWR1642

HI,

I am using IWR1642 board connec USB -> jetson nano. I can send config and read data from USB to UART driver in Jetson Nano.  I am trying to get rid of the this USB cable since I noticed that there is AR_RS232TX and AR_RS232RX pin.

I noticed that vital signal  is using one dedicated UART to send data(is this AR_MSS_LOGGER signal on the schmatics ) and for getting the command it is using another UART( is it AR_RS232RX signal) ?.  I am attached the schematics.

Now my question is that can I change the data out path from AR_MSS_LOGGER  to AR_RS232TX pin out. so we can connect these AR_RS232TX & AR_RS232RX pin to Jetson NANO and get rid of the usb cable.  

do you see any potention problem ?  

Thanks

  • 0
    TI__Mastermind 24955 points

    Terry,

    AR_MSS_LOGGER is an output only signal. It is configured for UART TX only. You need the AR_RS232TX and AR_RS232RX UART pins to send commands to the sensor and receive signals back. The AR_MSS_LOGGER is used to send output data to the connected PC for visualization. The IWR1642 leverages two different UART ports and they cannot be combined into a single UART.

    Regards,
    Kyle

  • 0 in reply to Kyle Cousino
    Prodigy 170 points

    Thanks Kyle,

    On the pc side I saw /dev/ttyACM0 and /dev/ttyACM1

    does  /dev/ttyACM0 map to AR_MSS_LOGGER for reading the data for visualization

    does /dev/ttyACM1 map to  AR_RS232TX & AR_RS232RX for sending command to sensor and recevie signals backs ? also here after sending command to the sensor what kind of signal is receiving back ? acknowlegement ? 

    Thanks,

    Terry

  • 0 in reply to terry fang
    TI__Mastermind 24955 points

    Terry,

    On a Windows PC, when you have the EVM sensor connected and powered on, two COM port entries are populated. The first COM port is the "Application/UART" COM port. This COM port is what the CLI commands are sent over. The second COM port is the "Auxiliary/Data" COM port. This COM port is used for sending the output data from the sensor to the PC.

    Regards,
    Kyle 

  • 0 in reply to Kyle Cousino
    Prodigy 170 points
    Hi Kyle Are AR_RS232TX & AR_RS232RX both used for CLI command and why?
  • 0 in reply to terry fang
    TI__Mastermind 24955 points

    Terry,

    Yes both AR_RS232TX and AR_RS232RX are used for CLI commands. You cannot consolidate the two COM ports into a single COM port.

    Regards,
    Kyle