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MSP430I2040: Modifying the Communication Protocol on EMDC-Generated Code

Anuradha Bulakh
Intellectual 480 points
Part Number: MSP430I2040

Tool/software: Code Composer Studio

Hello,

I have generated code using EMDC.

Now I want to modify as per my application. I want to change uart protocol for sending metering parameters.

Can I call functions independently?

Please help me regarding this.

Thanks

Anuradha.

  • 0
    TI__Genius 14655 points

    Hello Anuradha,

    First off could you please be more specific when creating a title for your posts so that other customers can find solutions to similar issues you are having?

    You are welcome to modify the source code as needed for your specific application; however it likely wont work with the EMDC GUI anymore if you change the communication protocol aspect of the source code. You could use two different EMDC-generated projects: one project to calibrate the system with the EMDC GUI, then copy the calibration factors over to the other project with the different protocol.

    Refer to this E2E thread where a customer had a similar inquiry regarding changing the communication protocol for their specific application.

    Best regards,

    Matt

  • 0 in reply to Matt Calvo
    Intellectual 480 points

    Hi Matt,

    Thanks for the reply!

    Yes, I will take care while creating title (more specific).

    I don't want EVM to communicate with GUI, rather want to call functions which will return values of metering parameters(Voltage, current, PF, active and reactive power etc) and then as per application protocol I want to send it on UART.

    I found difficulties while modifying code.

    Like-

    1.What is baudrate of uart in code and how I can change it?

    2.Which are functions there which will give me metering parameter values? Do you have API for that?

    In short what I want to do ,

    Eg,

    VTG= get_VTG();

    PF=get_PF();

    Now I have VTG, PF. I can send it to uart as per protocol.

    Please guide me regarding this.

    Thanks,

    Anuradha.

  • 0
    Intellectual 480 points

    Part Number: MSP430I2040

    Tool/software: Code Composer Studio

     Hello,

    This is related to previous post but as observed not getting response to comment on previous post (below link)

    http://e2e.ti.com/support/microcontrollers/msp430/f/166/p/839870/3106012#3106012

     

    so created new thread.

     

    In EMDC generated code I made some changes as baud rate at 9600 and transmitting metering data on uart.

     

    But not able to decode it.

     

    Eg. For frequency getting 2 bytes as 0x9A and 0x13. How to decode it to display around 50 hz.

     

    Code is not calibrated yet. But getting same response for example code for 50hz 1-phase metering( which I suppose is calibrated)

    This is first question.

     

     

    And second is ,

     

    In same previous post mentioned above reply from TI is,

     

    "You could use two different EMDC-generated projects: one project to calibrate the system with the EMDC GUI, then copy the calibration factors over to the other project with the different protocol"

     

    So, how tocopy calibration factors to new project. Please explain in detail.

     

    Thanks,

    Anuradha.

  • 0 in reply to Anuradha Bulakh
    TI__Genius 14655 points

    Hey Anuradha,


    I went ahead and merged your latest post so that support for the same issue resides in the same thread.


    As you likely have already found out, the default UART baud rate is 250k and modifications to the default UART configuration can be made in the 'uart_defs.h' file located under your CCS project > DesignCenter > comm > drivers folder. Please refer to this E2E FAQ for detailed information regarding how to change the default baud rate generated by EMDC.

    The 2 bytes you are receiving for the frequency are valid because if you plug in 0x139A into a calculator you will find that the decimal value equates to 5018 which means that it is reporting a 50.18Hz frequency. This is explained in the EMDC Technology Guide in the Communication Protocol Spec. section under "Frequency Result".


    All of the calibration factors associated with the energy measurement algorithm resides in the ‘EM_userConfig.c’ file located under your CCS project >EM_Config folder. If you do plan to use the recommendation to have 2 separate projects for calibrating the system via the GUI and having a customized version for your application, then you will want to use the first project along with the GUI to find the calibration factors best suited for your specific hardware. Then you would go into the ‘EM_userConfig.c’ file and copy over the EM_Phase_Calibration structure identified below to the other more customized project which has your custom protocol implemented. (Disregard the actual numbers as this is just an example)

    EM_Phase_Calibration g_emPhaseCalibration[EM_PHASE_LENGTH] =
{
    //PHASE_A
    {
        .voltageSF = _IQ24(23.711392999),
        .currentSF = _IQ24(16.260255575),
        .activePowerSF = _IQ30(0.385561275),
        .reactivePowerSF = _IQ30(0.385561275),
        .phaseCorrection = 0x0071,
    },
};

    Best regards,

    Matt

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