SLAU928A May   2024  – September 2025 MSPM0L1227 , MSPM0L1227-Q1 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L2227 , MSPM0L2227-Q1 , MSPM0L2228 , MSPM0L2228-Q1

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Hardware Overview
    2. 2.2 Power Requirements
    3. 2.3 XDS110 Debug Probe
      1. 2.3.1 Isolation Jumper Block
      2. 2.3.2 Application (Backchannel) UART
    4. 2.4 Measure Current Draw of the MSPM0L2228
    5. 2.5 Clocking
    6. 2.6 BoosterPack Plug-in Module Pinout
    7. 2.7 Liquid Crystal Display (LCD)
    8. 2.8 SuperCap
  9. 3Software
    1. 3.1 Software Development Options
    2. 3.2 CCS Cloud
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layers
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Related Documentation
    1. 6.1 Supplemental Content
  13. 7Revision History

2.3.2 Application (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.

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.

LP-MSPM0L2228 Application Backchannel UART in Device Manager Figure 2-3 Application Backchannel UART in Device Manager

The backchannel UART is the XDS110 Class Application/User UART port. In this case, Figure 2-3 shows COM14, but this port can vary from one host PC to the next. After identifying the correct COM port, configure the port in the host application according to documentation. The user can then open the port and begin communication from the host.

On the target MSPM0L2228 side, the backchannel UART is connected to UART0 (PA10, PA11). The XDS110 has a configurable baud rate; therefore, the PC application configuring the baud rate needs to be the same baud rate.