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Example Summary

The following example configures the UART at 9600bps waiting to echo received characters. The device goes to Standby mode while waiting and uses interrupts to wake up.

Peripherals & Pin Assignments

Peripheral Pin Function
GPIOA PA0 Open-Drain Output
GPIOA PA15 Standard Output
SYSCTL
UART0 PA11 RX Pin
UART0 PA10 TX Pin
EVENT
DEBUGSS PA20 Debug Clock
DEBUGSS PA19 Debug Data In Out

BoosterPacks, Board Resources & Jumper Settings

Visit LP_MSPM0G3507 for LaunchPad information, including user guide and hardware files.

Pin Peripheral Function LaunchPad Pin LaunchPad Settings
PA0 GPIOA PA0 J27_9
  • PA0 is 5V tolerant open-drain so it requires pull-up
    • J19 1:2 Use 3.3V pull-up
    • J19 2:3 Use 5V pull-up

  • PA0 can be connected to LED1
    • J4 ON Connect to LED1
    • J4 OFF Disconnect from LED1
PA15 GPIOA PA15 J3_30
  • This pin can be used for testing purposes in boosterpack connector
    • Pin can be reconfigured for general purpose as necessary
PA11 UART0 RX J4_33/J26_6
  • PA11 can be used as UART RX connected to XDS-110 backchannel, to boosterpack connector or to CAN/LIN connector:
    • To use backchannel UART on J101:
      J22 1:2: Connects XDS-110 backchannel UART RX to J101
      J101 7:8 Connects XDS-110 backchannel to UART RX
    • To use UART on boosterpack connector:
      J22 2:3: Connects UART RX to J4_33
    • To use on J26 CAN/LIN connector:
      R63 is populated by default and connects pin to J26_6
PA10 UART0 TX J4_34/J26_5
  • PA10 can be used as UART TX connected to XDS-110 backchannel, to boosterpack connector or to CAN/LIN connector:
    • To use backchannel UART on J101:
      J21 1:2: Connects XDS-110 backchannel UART TX to J101
      J101 9:10 Connects XDS-110 backchannel to UART TX
    • To use UART on boosterpack connector:
      J21 2:3: Connects UART TX to J4_34
    • To use on J26 CAN/LIN connector:
      R62 is populated by default and connects pin to J26_5
PA20 DEBUGSS SWCLK N/A
  • PA20 is used by SWD during debugging
    • J101 15:16 ON Connect to XDS-110 SWCLK while debugging
    • J101 15:16 OFF Disconnect from XDS-110 SWCLK if using pin in application
PA19 DEBUGSS SWDIO N/A
  • PA19 is used by SWD during debugging
    • J101 13:14 ON Connect to XDS-110 SWDIO while debugging
    • J101 13:14 OFF Disconnect from XDS-110 SWDIO if using pin in application

Device Migration Recommendations

This project was developed for a superset device included in the LP_MSPM0G3507 LaunchPad. Please visit the CCS User’s Guide for information about migrating to other MSPM0 devices.

Low-Power Recommendations

TI recommends to terminate unused pins by setting the corresponding functions to GPIO and configure the pins to output low or input with internal pullup/pulldown resistor.

SysConfig allows developers to easily configure unused pins by selecting Board→Configure Unused Pins.

For more information about jumper configuration to achieve low-power using the MSPM0 LaunchPad, please visit the LP-MSPM0G3507 User’s Guide.

Example Usage

Compile, load and run the example. Connect to terminal if using Launchpad’s back-channel UART, or connect to external device using BoosterPack. The UART will wait to receive data and respond with echo. Every time UART receives data the LED toggles and the USER_TEST matches the LED pin state.