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

adc16_low_power_async_edma

adc16_low_power_async_edma#

Overview#

The ADC Low Power Async DMA demo application demonstrates the usage of the ADC and DMA peripheral while in a low power mode. The microcontroller is first set to very low power stop (VLPS) mode. Every 100 ms, low power timer trigger the ADC module convert value on ADC channel. After 16 times(1,6s) the DMA transfer finish interrupt wake up the CPU to process sampled data, print result to user and toggle LED.

Supported Boards#

FRDM-K22F
Hardware requirements

  • Mini/micro USB cable

  • FRDM-K22F board

  • Personal Computer

Board settings

This 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 Demo

  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 demo.

Running the demo

When the demo runs successfully, the log would be seen on the OpenSDA terminal like:

ADC LOW POWER ASYNC DMA DEMO
ADC16_DoAutoCalibration() Done.
ADC value: 15670
ADC value: 16634
ADC value: 16686
ADC value: 16681

Note:

  • LED will be toggled when the CPU wake up.

Contents