SLAU869E October   2022  – January 2024

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Getting Started
    1. 1.1 Introduction
    2. 1.2 Key Features
    3. 1.3 What's Included
      1. 1.3.1 Kit Contents
      2. 1.3.2 Software Examples
    4. 1.4 First Step Out-of-Box Experience
      1. 1.4.1 Connecting to the Computer
      2. 1.4.2 Running the Out-of-Box Experience
    5. 1.5 Next Steps: Looking Into the Provided Code
  5. 2Hardware
    1. 2.1 Jumper Map
    2. 2.2 Block Diagram
    3. 2.3 Hardware Features
      1. 2.3.1 MSPM0L1306 MCU
      2. 2.3.2 XDS110-ET Onboard Debug Probe With EnergyTrace Technology
      3. 2.3.3 Debug Probe Connection: Isolation Jumper Block
      4. 2.3.4 Application (or Backchannel) UART
      5. 2.3.5 Using an External Debug Probe Instead of the Onboard XDS110-ET
      6. 2.3.6 Using the XDS110-ET Debug Probe With a Different Target
      7. 2.3.7 Special Features
        1. 2.3.7.1 Thermistor
        2. 2.3.7.2 Light Sensor
    4. 2.4 Power
      1. 2.4.1 XDS110-ET USB Power
    5. 2.5 External Power Supply and BoosterPack Plug-in Module
    6. 2.6 Measure Current Draw of the MSPM0 MCU
    7. 2.7 Clocking
    8. 2.8 BoosterPack Plug-in Module Pinout
  6. 3Software Examples
  7. 4Resources
    1. 4.1 Integrated Development Environments
      1. 4.1.1 TI Cloud Development Tools
      2. 4.1.2 TI Resource Explorer Cloud
      3. 4.1.3 Code Composer Studio Cloud
      4. 4.1.4 Code Composer Studio IDE
    2. 4.2 MSPM0 SDK and TI Resource Explorer
    3. 4.3 MSPM0L1306 MCU
      1. 4.3.1 Device Documentation
      2. 4.3.2 MSPM0L1306 Code Examples
    4. 4.4 Community Resources
      1. 4.4.1 TI E2E Forums
  8. 5Schematics
  9. 6Revision History

2.3.4 Application (or Backchannel) UART

The backchannel UART allows communication with the USB host that is not part of the target application’s main functionality. This is very useful during development, and also provides a communication channel to the PC host side. This can be used to create graphical user interfaces (GUIs) and other programs on the PC that communicate with the LaunchPad development kit.

Figure 2-6 shows the pathway of the backchannel UART. The backchannel UART is connected to UART0 (PA8, PA9) deepening on the jumper settings on headers J16 and J17.

On the host side, a virtual COM port for the application backchannel UART is generated when the LaunchPad development kit enumerates on the host. You can use any PC application that interfaces with COM ports, including terminal applications like Hyperterminal or Docklight, to open this port and communicate with the target application. You need to identify the COM port for the backchannel. On Windows PCs, Device Manager can assist.

GUID-20221006-SS0I-DLRD-XSKN-LSLLZL8JJWGT-low.png Figure 2-6 Application Backchannel UART in Device Manager

The backchannel UART is the XDS110 Class Application/User UART port. In this case, Figure 2-6 shows COM14, but this port can vary from one host PC to the next. After identifying the correct COM port, configure in the host application according to documentation. The user can then open the port and begin communication from the host.

On the target MSPM0L1306 side, the backchannel is connected to the UART0 module. The XDS110-ET has a configurable baud rate; therefore, the PC application configuring the baud rate to be the same as what is configured on the UART0 is important.