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Example Summary

Toggles a GPIO configured as Hi-Z and on board LED. A logic low is forced actively, but a logic high sets the pin as Hi-Z. This feature is useful for open-drain digital input/output applications. This example expects an external pull-up, but an internal pull-up could be used.

Peripherals & Pin Assignments

Peripheral Pin Function
GPIOA PA0 Open-Drain Output
GPIOA PA6 Standard Output
SYSCTL
EVENT
DEBUGSS PA20 Debug Clock
DEBUGSS PA19 Debug Data In Out

BoosterPacks, Board Resources & Jumper Settings

Visit LP_MSPM0L1306 for LaunchPad information, including user guide and hardware files.

Pin Peripheral Function LaunchPad Pin LaunchPad Settings
PA0 GPIOA PA0 J1_10
  • PA0 is 5V tolerant open-drain so it requires pull-up
    • J10 2:3 Use 3.3V pull-up
    • J10 1:2 Use 5V pull-up

  • PA0 can be connected to LED1
    • J2 ON Connect to LED1
    • J2 OFF Disconnect from LED1
PA6 GPIOA PA6 J1_7
  • This pin can be used for testing purposes in boosterpack connector
    • Pin can be reconfigured for general purpose as necessary
PA20 DEBUGSS SWCLK J2_13
  • 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 J2_17
  • 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_MSPM0L1306 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-MSPM0L1306 User’s Guide.

Example Usage

Connect an external pull-up to pin. Compile, load and run the example. Check output of pin. Note that without the pull-up, the pin will be in Hi-Z when high.