SLAA494B May   2011  – September 2023 MSP430AFE221 , MSP430AFE222 , MSP430AFE223 , MSP430AFE231 , MSP430AFE232 , MSP430AFE233 , MSP430AFE251 , MSP430AFE252 , MSP430AFE253

 

  1.   1
  2.   Implementation of a Single-Phase Electronic Watt-Hour Meter Using the MSP430AFE2xx
  3. 1 Trademarks
  4. 2 Introduction
  5. 3 Block Diagram
  6. 4 Hardware Implementation
    1. 4.1 Power Supply
      1. 4.1.1 Resistor Capacitor (RC) Power Supply
      2. 4.1.2 Switching-Based Power Supply
    2. 4.2 Analog Inputs
      1. 4.2.1 Voltage Inputs
      2. 4.2.2 Current Inputs
  7. 5 Software Implementation
    1. 5.1 Peripherals Setup
      1. 5.1.1 SD24 Setup
    2. 5.2 Foreground Process
      1. 5.2.1 Formulas
        1. 5.2.1.1 Voltage and Current
        2. 5.2.1.2 Power and Energy
    3. 5.3 The Background Process
      1. 5.3.1 Voltage and Current Signals
      2. 5.3.2 Phase Compensation
      3. 5.3.3 Frequency Measurement and Cycle Tracking
      4. 5.3.4 LED Pulse Generation
    4. 5.4 Energy Meter Configuration
  8. 6 Energy Meter Demo
    1. 6.1 EVM Overview
      1. 6.1.1 Connections to the Test Setup or AC Voltages
      2. 6.1.2 Power Supply Options
    2. 6.2 Loading the Example Code
      1. 6.2.1 Opening the Project
  9. 7 Results
    1. 7.1 Viewing Results on PC
    2. 7.2 Viewing Results During Debug
  10. 8 Important Notes
  11. 9 Schematics
  12. 10References
  13. 11Revision History

6.2.1 Opening the Project

The Source folder structure is shown in Figure 6-3.

GUID-1D12172D-C40F-4A11-AB45-7AD57BC070AA-low.pngFigure 6-3 Source Folder Contents

The emeter-ng folder contains project files; for this application, use the EVM_AFE253.ewp project file. The emeter-toolkit folder has a corresponding project file named emeter-toolkit-afe2xx.ewp. For first time use, it is recommended that you complete rebuild of both projects:

  1. Open IAR Embedded Workbench®, find and load the project emeter-toolkit-afe2xx.ewp, and rebuild all (see Figure 6-4).
    GUID-21E94741-7F62-4EC7-8577-325F719538C2-low.pngFigure 6-4 Toolkit Compilation in IAR
  2. Close the existing workspace and open the main project EVM_AFE253.ewp, rebuild all and load this onto the MSP430AFE253 (see Figure 6-5).
    GUID-AB14286A-735E-4DD8-B87F-43CDF37A8425-low.pngFigure 6-5 Metrology Project Build in IAR
  3. Load it onto the EVM and hit GO from the Debug menu, once the main project has been rebuilt.