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How to create UART connection using CC2650 SensorTag?

Joshua Bijak
Intellectual 790 points
Other Parts Discussed in Thread: CC2650, CC2650STK

Hey there,

Let me give you overview of the project I am trying to create. 

Ultimately I am looking to create a device that uses a ZNP+ZAP setup that uses a 5X5 CC2650 and a STM32 MCU. The two are currently wired together on a custom board via UART. I have been able to flash the SensorTag+ZstackCore project successfully to the 2650. I can connect it to a network as a SensorTag

I have not begun looking at transmitting data over UART yet. I am looking to receive or view UART test data from a SensorTag to theCCDebugger to my PC. Once i get the UART test data from a sensortag, I can use a similar approach for my custom board. This will allow me to verify the UART is working on the board. Once I have a proper UART connection I will start pushing real data through the UART and see if the 2650 can package and handle that properly.

I am going by a very step by step approach. I am wondering if anyone has done this before? And if so, what was required to get it working. 

I am aware that the ZNP+ZAP setup will require the STM to have ZDO commands from the Zigbee library. So for now I am using a Zstackcore+SensorTag image for the 2650. Would it be possible to connect another  pseudo"sensor" to the UART aka the STM to the SensorTag?

Currently I have imported the UART.h and UART.c files into the IAR SensorTag project. But I am not sure what to do from there and what to call to send and receive data through a UART line.

Any and all help is always appreciated,

-J

  • 0
    Guru 735685 points
    CC2650 is a very powerful SOC. Unless you want to run ZC or ZR on it, I don't suggest you to use ZAP-ZNP which would need an extra MCU.
  • 0 in reply to YiKai Chen
    Intellectual 790 points

    Ok, good to know. I think I'll stick with my current SensrTag+Enddevice setup then. Do you have any insight on how to create UART connections on it?

  • 0 in reply to Joshua Bijak
    Guru 735685 points

    You can do the following steps to enable UART on CC2650STK.

    1. Revise the following red lines in Board.c (under C:\ti\tirtos_simplelink_2_11_01_09\packages\ti\boards\SensorTag\CC26XXST_0120)

    const UARTCC26XX_HWAttrs uartCC26XXHWAttrs[CC2650_UARTCOUNT] = {
        {    /* CC2650_UART0 */
            .baseAddr = UART0_BASE,
            .intNum = INT_UART0,
            .powerMngrId = PERIPH_UART0,
            .txPin = Board_DP5_UARTTX,
            .rxPin = Board_DP4_UARTRX,
            .ctsPin = PIN_UNASSIGNED,
            .rtsPin = PIN_UNASSIGNED
        },
    };

    2. Add "#include <ti/drivers/UART.h>" in sensortagapp.c

    3. Claim two global variables "static UART_Handle SbpUartHandle;" and "static UART_Params SbpUartParams;" in sensortagapp.c

    4. You can add the following codes in the end of SensorTagApp_initialization() to output UART messages.

      {  
      uint8 txbuf[] = {0,1,2,3,4};
      UART_Params_init(&SbpUartParams);
      SbpUartHandle = UART_open(CC2650_UART0, &SbpUartParams);
      UART_write(SbpUartHandle, txbuf, 5);
      }

  • 0 in reply to YiKai Chen
    Intellectual 790 points

    Awesome, I take it that this only outputs what is received on the UART line? Does this function like an echo? Or do I have to send data to the UART line from the app elsewhere?

    Edit:

    I performed all the changes. tera Term Still does not echo back the words I type. Is there anything else I am missing? 

  • 0 in reply to Joshua Bijak
    Guru 735685 points
    To receive UART message, you should register A UART receiver callback to do it.
  • 0 in reply to YiKai Chen
    Intellectual 790 points

    I have actually solved the UART issue.

    I was able to make use of the TL module.

    By adding an event handler to SensorTagApp_process

    #if defined (NPI_USE_UART) || defined (NPI_USE_SPI)
    //TL handles driver events. this must be done first
    TL_handleISRevent();
    #endif //TL

    Now when I connect to the SensorTag 2650 via Tera Term, I am now able to successfully echo values to the screen. I am able to do the same on the custom board as long as I change the Board.h Pinout to what my custom board is.

    This page was helpful. Although written for Bluetooth, the way it is used is the same for Zigbee.

    http://processors.wiki.ti.com/index.php/Adding_driver_cc2650

  • 0 in reply to Joshua Bijak
    Guru 735685 points
    Thanks for sharing.
  • 0 in reply to Joshua Bijak
    Intellectual 760 points

    Hello,

    Whilst I am working with a TL module implementation I would like to know

    how do the MRDY/SRDY management because from my experience the

    TL library does not work with the POWER_SAVING predefined option.

    Otherwise MRDY/SRDY will be required although I will assign to

    PIN_UNASSIGNED both pins.

    I suppose that the MRDY/SRDY “handshake” sequence described on

    "Adding Serial Communication to a BLE Project"  will enable both devices

    to be ready to send and/or receive data.

    Welcome any advice.

    Thanks

    Alex