Overview

The Power mode switch demo application demonstrates the use of power modes in the KSDK. The demo prints the power mode menu through the debug console, where the user can set the MCU to a specific power mode. User can wakeup the core by key interrupt. The purpose of this demo is to show how to switch between different power modes, and how to configure a wakeup source and wakeup the MCU from low power modes. Hardware requirements

  • Mini/micro USB cable

  • MIMXRT1060-EVKB 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. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.

Running the demo

When running the demo, the debug console shows the menu to command the MCU to the target power mode.


CPU wakeup source 0x1...

***********************************************************
	Power Mode Switch Demo for iMXRT1062
***********************************************************

***********************************************************
CPU:             600000000 Hz
AHB:             600000000 Hz
SEMC:            75000000 Hz
IPG:             150000000 Hz
PER:             75000000 Hz
OSC:             24000000 Hz
RTC:             32768 Hz
ARMPLL:          1200000000 Hz
USB1PLL:         480000000 Hz
USB1PLLPFD0:     720000000 Hz
USB1PLLPFD1:     246857130 Hz
USB1PLLPFD2:     332307684 Hz
USB1PLLPFD3:     576000000 Hz
USB2PLL:         24000000 Hz
SYSPLL:          528000000 Hz
SYSPLLPFD0:      351999990 Hz
SYSPLLPFD1:      594000000 Hz
SYSPLLPFD2:      396000000 Hz
SYSPLLPFD3:      594000000 Hz
ENETPLL0:        24000000 Hz
ENETPLL1:        24000000 Hz
ENETPLL2:        24000000 Hz
AUDIOPLL:        24000000 Hz
VIDEOPLL:        24000000 Hz
***********************************************************

Task 2 is working now
Task 1 is working now

########## Power Mode Switch Demo (build Apr 25 2019) ###########

    Core Clock = 600000000Hz 
    Power mode: Over RUN

***********************************************************
CPU:             600000000 Hz
AHB:             600000000 Hz
SEMC:            75000000 Hz
IPG:             150000000 Hz
PER:             75000000 Hz
OSC:             24000000 Hz
RTC:             32768 Hz
***********************************************************


Select the desired operation 

Press  A for enter: Over RUN       - System Over Run mode
Press  B for enter: Full RUN       - System Full Run mode
Press  C for enter: Low Speed RUN  - System Low Speed Run mode
Press  D for enter: Low Power RUN  - System Low Power Run mode
Press  E for enter: System Idle    - System Wait mode
Press  F for enter: Low Power Idle - Low Power Idle mode
Press  G for enter: Suspend        - Suspend mode
Press  H for enter: SNVS           - Shutdown the system

Waiting for power mode select...

Note: Only input when the demo asks for input. Input entered at any other time might cause the debug console to overflow and receive the wrong input value.

Note: When wake up from Suspend state, target will reset. Please run in flexspi_nor_debug and flexspi_nor_release targets to test Suspend states.

Note: To download binary into external flash and boot from external flash directly, following steps are needed:

  1. Compile flash target of the project, and get the binaray file “power_mode_switch_rtos.bin”.

  2. Set the SW4: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J41.

  3. Drop the binaray into disk “RT1060-EVK” on PC.

  4. Wait for the disk disappear and appear again which will take couple of seconds.

  5. Reset the board by pressing SW7 or power off and on the board.

Note: To debug in external flash, following steps are needed:

  1. Select the flash target and compile.

  2. Set the SW4: 1 off 2 off 3 on 4 off, then power on the board and connect USB cable to J41.

  3. Start debugging in IDE.

    • Keil: Click “Download (F8)” to program the image to external flash first then clicking “Start/Stop Debug Session (Ctrl+F5)” to start debugging.