SLAU908B October   2023  – May 2024 MSPM0C1104

 

  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
    4. 2.4 Measure Current Draw of the MSPM0C1104
    5. 2.5 Clocking
    6. 2.6 BoosterPack Plug-in Module Pinout
  9. 3Software
    1. 3.1 Software Development Options
    2. 3.2 Out-of-box GUI
    3. 3.3 CCS Cloud
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Revision History

2.3 XDS110 Debug Probe

LP-MSPM0C1104 features a onboard debug probe to streamline prototyping. The debugger used on this LaunchPad is the XDS110 variant, which supports all MSPM0 device derivatives. The integrated XDS110 debug probe is physically separated from the rest of the MSPM0C1104 circuitry as shown in figure 2.x. The XDS110 is also electrically separated from the MSPM0C1104. The XDS110 is only connected through signals that pass through J101, in addition to a common ground.

Isolation Jumper Block

The isolation jumper block at jumper J101 allows the user to connect or disconnect signals that cross from the XDS110 domain into the MSPM0C1104 target domain. This includes XDS110 SWD signals, application UART signals, and 3.3V and 5V power.

Jumper Description
5V 5V VBUS from USB.
3V3 3.3V rail, derived from VBUS in the XDS110-ET domain.
RXD<< Backchannel UART: The target MSPM0L1306 receives data through this signal. The arrows indicate the direction of the signal.
TXD>> Backchannel UART: The target MSPM0L1306 sends data through this signal. The arrows indicate the direction of the signal.
NRST RST signal.
SWDIO Serial wire debug: SWDIO data signal.
SWCLK Serial wire debug: SWDCLK clock signal.

During normal prototyping all shunts are populated. However, there are some scenarios where a user needs to open these connections:

  • To remove any and all influence from the XDS110 debug probe for high accuracy target power measurements.
  • To control 3.3V and 5V power flow between the XDS110 and target domains.
  • To expose the target MCU pins for other use than onboard debugging and application UART communication.
  • To expose the programming and UART interface of the XDS110 so that the XDS110 can be used for devices other than the onboard MCU.

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.

Figure 3-3 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.

MSPM0C1104 LP-MSPM0C1104 Application Backchannel UART in Device ManagerFigure 2-3 Application Backchannel UART in Device Manager

The backchannel UART is the XDS110 Class Application/User UART port. In this case, Figure 3-3 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 MSPM0C1104 side, the backchannel is connected to the UART0 module. The XDS110 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.