Kinetis SDK v.1.2 Demo Applications User's Guide  Rev. 0
Freescale Semiconductor, Inc.
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LPTMR Example

Overview

The LPTMR (Low Power Timer) project is a demonstration program to show how to use the LPTMR driver. It triggers an LPTMR interrupt once every second and prints out the number of interrupts that have occurred since the program started running.

Supported Platforms

These Freescale Freedom development platforms and Tower System modules are supported by the LPTMR example.

System Requirement

Hardware requirements

Toolchain requirements

Software requirements

Getting Started

Hardware settings

The LPTMR Example project does not call for any special hardware configurations. Although not required, the recommendation is to leave the development board's jumper settings and configurations in default state when running this example.

Prepare the example

  1. Connect a USB cable between the PC host and the OpenSDA USB port on the board.
  2. Open a serial terminal with these settings:
    • 115200 baud rate
    • 8 data bits
    • No parity
    • One stop bit
    • No flow control
  3. Download the program to the target board.
  4. Either press the reset button on your board or launch the debugger in your IDE to begin running the example.

Run the example

These instructions are displayed/shown on the terminal window:

Low Power Timer Example
LPTMR interrupt No.1
LPTMR interrupt No.2
LPTMR interrupt No.3

An LPTMR interrupt is triggered once every second. The LED blinks and prints out the number of interrupts that have occurred since the program started running.