TIDUE59A May   2018  – September 2020

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5. 1System Description
    1. 1.1 Key System Specifications
  6. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 CC3220
      2. 2.3.2 CC2640R2F
      3. 2.3.3 DRV8837
    4. 2.4 System Design Theory
      1. 2.4.1 CC3220S to CC2640R2F Interface
      2. 2.4.2 CC3220S to DRV8837 Interface
      3. 2.4.3 Software Architecture
      4. 2.4.4 Network Connection Management
      5. 2.4.5 Provisioning
        1. 2.4.5.1 AP Provisioning and SmartConfig™
        2. 2.4.5.2 Wi-Fi Provisioning Over BLE
      6. 2.4.6 Sending and Receiving Messages Through Cloud
        1. 2.4.6.1 Message Queue Telemetry Transport Protocol
        2. 2.4.6.2 MQTT Client Implementation
      7. 2.4.7 Over-the-Air Updates
        1. 2.4.7.1 HyperText Transfer Protocol
      8. 2.4.8 Security Enablers
        1. 2.4.8.1 Secure Boot
        2. 2.4.8.2 Secure Sockets
          1. 2.4.8.2.1 Hardware Accelerators
          2. 2.4.8.2.2 Simple Network Time Protocol
        3. 2.4.8.3 File System Security
          1. 2.4.8.3.1 Failsafe Files and Bundle Protection
      9. 2.4.9 Low-Power Consumption
  7. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 CC3220S LaunchPad™ Development Kit
        2. 3.1.1.2 CC2640R2F LaunchPad™ Development Kit
        3. 3.1.1.3 Sensor BoosterPack™ Connections (BMI160)
        4. 3.1.1.4 DRV8837EVM Modifications and Connections
        5. 3.1.1.5 Assembling EVMs
      2. 3.1.2 Software
        1. 3.1.2.1 Getting Started With Software
          1. 3.1.2.1.1 Build simple_np Application and Flash CC2640R2F
          2. 3.1.2.1.2 Use Premade UniFlash ImageCreator Project
          3. 3.1.2.1.3 Importing Project Source Files Into CCS
        2. 3.1.2.2 User Files
        3. 3.1.2.3 Run Wi-Fi® Doorlock Demo
          1. 3.1.2.3.1 Connect CC3220 to Network
          2. 3.1.2.3.2 Networking Functions
            1. 3.1.2.3.2.1 Get Current Date and Time (SNTP)
            2. 3.1.2.3.2.2 Send and Receive Messages (MQTT)
            3. 3.1.2.3.2.3 Perform Software Update Using Dropbox (OTA Update)
    2. 3.2 Testing and Results
      1. 3.2.1 Pass or Fail Tests
      2. 3.2.2 Power Measurements
      3. 3.2.3 Test Setup
        1. 3.2.3.1 CC3220S
        2. 3.2.3.2 CC2640R2F
        3. 3.2.3.3 DRV8837
      4. 3.2.4 Test Results
      5. 3.2.5 Battery Life Estimate
  8. 4Design Files
  9. 5Software Files
  10. 6Related Documentation
    1. 6.1 Trademarks
  11. 7Terminology
  12. 8About the Author
  13. 9Revision History

3.1.1.4 DRV8837EVM Modifications and Connections

By default, the DRV8837 on the DRV8837EVM is controlled by an onboard MSP430™ MCU, and the entire DRV8837EVM is powered through a micro-USB interface. To control the DRV8837 from the CC3220S, the following steps must be taken to modify the DRV8837EVM and connect it to the CC3220S LaunchPad.

  1. Remove R3 and R4 (0-Ω resistors) from the back of the DRV8837EVM to disconnect the IN1/IN2 signals of the DRV8837 from the MSP430 (see Figure 3-3).
  2. Provide power to the DRV8837 from the CC3220 LaunchPad by connecting the 5-V, GND pins of J23 on the CC3220S LaunchPad to J1 on the DRV8837EVM see Figure 3-4).
  3. Connect to the IN1 and IN2 test points on the DRV8837EVM from the CC3220S LaunchPad headers corresponding to P16 and P17 (see Figure 3-4).
GUID-C4C520E6-7190-4D82-AFB1-623C13A17D6E-low.gifFigure 3-3 R3 and R4 Location on Back of DRV8837EVM
GUID-428782E0-115A-4BC3-9BCF-709D5DA55DED-low.gifFigure 3-4 J1 and IN1/IN2 Highlighted on Front of DRV8837EVM

In this example, two GPIOs and one PWM signal are used to control the DRV8837. Table 3-3 lists the connections required between the LaunchPad and the modified DRV8837EVM when using the included reference software.

Table 3-3 CC3220 LaunchPad™ to DRV8837EVM Connection List
CC3220 LAUNCHPADDRV8837EVM
P18nSleep (JP2)
P16IN1 (TP1)
P17IN2 (TP2)
5VVM (J1)
GNDGND (J1)

Further modifications of the DRV8837EVM are necessary to accurately measure the power consumption of the motor. These modifications are described in Section 3.2.