MCUXpresso SDK Documentation
Open on Repo Open an Issue
Source (.md/.rst) Page PDF (.pdf)

lpi2c_vlps_peripheral

lpi2c_vlps_peripheral#

Overview#

This example describes how to use kinetis SDK drivers to implement LPI2C transmit and receive in the VLPS (very low power STOP mode) with async DMA. The LPI2C module is designed to have ability to work under low power module like STOP, VLPW and VLPS. It can use DMA to transmit the data from or to application user buffer without CPU interaction.

It uses LPI2C to access the on board accelerometer sensor to read the Accelerometer X, Y, Z data every 500ms. CPU would keep in VLPS low power mode, except for some trigger events and data output to LPUART0.

Supported Boards#

FRDM-KE15Z
Hardware requirements

  • Micro USB cable

  • FRDM-KE15Z board

  • Personal Computer

Board settings

No special settings are required.

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Press the reset button to begin running the demo.

Running the demo

Disconnect any debugger to run this demo in case the sequence of entering sleep mode is interrupted. When the example runs successfully, you can see the similar information from the terminal as below.

LPI2C_VLPS demo start...
X:    2,  Y: -148,  Z: 2107
X:   -2,  Y:  -97,  Z: 2086
FRDM-KE17Z
Hardware requirements

  • Micro USB cable

  • FRDM-KE17Z board

  • Personal Computer

Board settings

Make sure the FXOS8700CQ(U12) on the board is installed to run this demo. No special settings are required.

Prepare the Demo

  1. Connect a USB cable between the host PC and the OpenSDA USB port on the target board.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Press the reset button to begin running the demo.

Running the demo

Disconnect any debugger to run this demo in case the sequence of entering sleep mode is interrupted. When the example runs successfully, you can see the similar information from the terminal as below.

LPI2C_VLPS demo start...
X:    2,  Y: -148,  Z: 2107
X:   -2,  Y:  -97,  Z: 2086
FRDM-KE17Z512
Hardware requirements

  • Micro USB cable

  • FRDM-KE17Z512 board

  • Personal Computer

Board settings

Make sure the FXLS8974CFR3(U12) on the board is installed to run this demo. No special settings are required.

Prepare the Demo

  1. Connect a USB cable between the host PC and the MCU-LINK USB port on the target board.

  2. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  3. Download the program to the target board.

  4. Press the reset button to begin running the demo.

Running the demo

Disconnect any debugger to run this demo in case the sequence of entering sleep mode is interrupted. When the example runs successfully, you can see the similar information from the terminal as below.

LPI2C_VLPS demo start...
X:    2,  Y: -148,  Z: 2107
X:   -2,  Y:  -97,  Z: 2086
Contents