MCUXpresso_LPC55S69/boards/lpcxpresso55s69/driver_examples/ostimer/cm33_core0

Overview

The OSTIMER project is a simple demonstration program of the SDK OSTIMER driver. It sets the OSTIMER as the wakeup source from deep-sleep mode. Board will enter power deep sleep mode, and then wakeup by OS timer after about 5 seconds. After wakeup from deep-sleep mode, OS timer will set match value to trigger the interrupt while the timer count tick reach the match value about every 2 seconds.

SDK version

• Version: 2.15.000

Toolchain supported

• IAR embedded Workbench 9.40.1
• Keil MDK 5.38.1
• GCC ARM Embedded 12.2
• MCUXpresso 11.8.0

Hardware requirements

• Mini/micro USB cable
• LPCXpresso55s69 board
• Personal Computer

Board settings

No special settings are required.

Prepare the Demo

Note: MCUXpresso IDE project default debug console is semihost

1. Connect a micro USB cable between the PC host and the CMSIS DAP USB port (P6) on the board
2. Open a serial terminal with the following settings (See Appendix A in Getting started guide for description how to determine serial port number):
   • 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 demo.

Running the demo

The log below shows the output of the hello world demo in the terminal window:

Press any key to start example.

Board will enter power deep sleep mode, and then wakeup by OS timer after about 5 seconds.
After Board wakeup, the OS timer will trigger the match interrupt about every 2 seconds.
Board wakeup from deep sleep mode.

OS timer match value reached
OS timer match value reached
OS timer match value reached