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MSP430I2041: EMDC Active Energy value sent over UART doesn't match activeEnergy expression in debug window for single phase energy meter

Fakruddin Mulla9
Prodigy 100 points
Part Number: MSP430I2041
Other Parts Discussed in Thread: MSP430I2040,

Dear Sir,

We are using MSP430I2040 for the energy measurement.
The Energy measurement in debug windiw is 706164 and the same energy information is transferred to another device via UART...

For the energy value mentioned above the UART message is as follows :
packet->payload[4] = actEnergy[0] = 0xE3;
packet->payload[5] = actEnergy[1] = 0x83;
packet->payload[6] = actEnergy[2] = 0x02;
packet->payload[7] = actEnergy[3] = 0x00;
packet->payload[8] = actEnergy[4] = 0x00;
packet->payload[9] = actEnergy[5] = 0x00;
packet->payload[10] = actEnergy[6]= 0x00;
packet->payload[11] = actEnergy[7] =0x00;

For the Hex conversion of 706164 is ox000AC674. Let me know if any mistake in my understading.

Thanks and Regards,

Fakruddin Mulla

  • 0
    TI__Mastermind 41310 points
    Hello Fakruddin,

    Are you using a software from TI? Can you please let me know which software base you are using?

    You may also want to check out the latest energy measurement SW package for MSP430I2041 below.

    www.ti.com/.../msp-em-design-center
  • 0 in reply to Eddie LaCost
    Prodigy 100 points

    Hello Sir,

    I am using the same software package from TI, EnergyMeasurementDesignCenter , and generated code from this.

    But power values and packet message both are not matching.

    Thanks and Regards,

    Fakruddin Mulla

  • 0 in reply to Fakruddin Mulla9
    TI__Mastermind 41310 points

    Hello Fakruddin,

    We tested the example code here and the data is matching properly.  Please see the image below.  Can you also have a look at these results on your set up?  I want to be sure that you are not comparing aggregated results with active energy.  Also, have you made any changes to the code?

     

  • 0 in reply to Eddie LaCost
    Prodigy 100 points

    Hello Sir,

    Thanks for your reply. 

     

    We are using EM_GUI to generate code. Here is the results we are observed while testing :

     

    RMS voltage : 2287901(Debug window)

    Hex RMS voltage : 0x0022E91D

    UART Message : 55 AA 0A 04 80 01 01 1D E9 EE 00 7F 01

    VRMS data : (LSB) 1D E9 EE 00 (MSB)

    VRMS value  = 228.79V

    Which is matching the VRMS value showed in Debug window

     

    RMS current : 372155 (Debug window)

    Hex IRMS  : 0x0005ADBB

    UART Message : 55 AA 0A 04 81 01 01 BB AD 05 00  E2 00

    IRMS data : (LSB) BB AD 05 00 (MSB)

    IRMS value  = 0.372155A

    Which is matching the IRMS value showed in Debug window

     

    Power Factor : 9999(Debug window)

    Hex Conversion : 0x270F

    UART Message : 55 AA 0A 04 84 01 01 0F 27 2C 01

    PF data : (LSB) OF 27 (MSB)

    PF value  = 0.9999

    Which is matching the PF value showed in Debug window

     

    Frequency :4999(Debug window)

    Hex Conversion: 0x1387

    UART Message : 55 AA 0A 04 85 01 01 87 13 CA 00

    PF data : (LSB) 87 13 (MSB)

    Frequency value  = 49.99Hz

    Which is matching the Frequency value showed in Debug window

     

    Active Energy :85136922 (Debug window)

    Hex Conversion: 0x0513161A (Which is not matching with packet)

    UART Message : 55 AA 0A 04 89 01 01  E3 83 02 00 00 00 00 00 F7 01

    Active Energy data : (LSB) E3 83 02 00 00 00 00 00 (MSB)

    Active Energy value  = 164835 (which is not correct)

    Which is not matching the Active energy value showed in Debug window

     

    We are able to decode the VRMS,IRMS,PF,Frequency but the Active energy is not matching with the value shown in debug window.

     

    Please clarify ?

  • 0 in reply to Fakruddin Mulla9
    TI__Mastermind 49692 points

    Hello,

    Unfortunately, I was not able to duplicate your error. In CCS, I put a breakpoint at the "Comm_writePacket(packet);" line inside the "CommandHandler_transmitActiveEnergy()" function in the 'emDCCommandHandlers.c' file.

    Then, I manually changed "packet->payload[4] ... payload[11]" from "actEnergy[0] ... actEnergy[7]" to hex values such as 0x1A, 0x16, 0x13, 0x05, 0x00, 0x00, 0x00 and 0x00. After sending the MCU the ACTIVE command, I confirmed that the UART packet with the command byte for Active Energy (0x89) matched what I changed in the code. To read the UART packets, I used a terminal program called Serial Port Utility and sent over the ACTIVE command one byte at a time at 250kBaud. This triggers the MSP430i2041 to start sending the results to the terminal once a second.

    Next, I undid my changes above and then manually changed the "activeEnergy" expression to "0x000000000513161A (Hex)" with the code halted at the same function. After running to the same breakpoint, I again confirmed that the UART packet matched the changed expression. Here are two screenshots demonstrating my findings.

    Please use the default EMDC project for the MSP430i2041 (without any changes) to generate the source code and then program the device with this code. You should be able to duplicate my results. Perhaps there's an issue with your host MCU that's reading the data from the MSP430i2041.

    Regards,

    James

  • 0 in reply to Fakruddin Mulla9
    TI__Mastermind 49692 points
    Hello,

    Have you had a chance to read through my feedback? Were you able to reproduce the issue?

    Regards,

    James
  • 0 in reply to James Evans
    Prodigy 100 points

    Hello Sir,

    Thanks for your attention . The issue has been solved .

    Regards,

    Fakruddin

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