MCUXpresso SDK Documentation
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Hardware requirements

Hardware requirements#

  • USB Type-C cable

  • MCIMX93-EVK board

  • J-Link Debug Probe

  • 12V~20V power supply

  • Personal Computer

Board settings#

No special settings are required.

Prepare the Demo#

  1. Connect 12V~20V power supply and J-Link Debug Probe to the board, switch SW301 to power on the board.

  2. Connect a USB Type-C cable between the host PC and the J1401 USB port on the target board.

  3. Open a serial terminal with the following settings:

    • 115200 baud rate

    • 8 data bits

    • No parity

    • One stop bit

    • No flow control

  4. Boot Linux BSP to u-boot, and load M core image from SD card to run. (Put the image into SD card before.) => load mmc 1:1 0x80000000 imx93_m33_TCM_power_mode_switch.bin => cp.b 0x80000000 0x201e0000 0x20000 => bootaux 0x1ffe0000 0

  5. Append “${mcore_clk}” in u-boot “mmcargs” env, before booting linux. => run prepare_mcore => setenv mmcargs ‘setenv bootargs ${jh_clk} ${mcore_clk} console=${console} root=${mmcroot}’

  6. You can also test power_mode_switch function with flash.bin. After flash.bin compilation, please load the bianry by using “UUU” command. For flash.bin test mode, please skip step 4.

Running the demo#

Mcore debug console shows the menu to command the MCU to the target power mode. The target power mode can be wakeup by LPTMR and LPUART. SYSTEM SLEEP flow: In linux console use command “echo mem > /sys/power/state” to suspend A55, then select SUSPEND mode in Mcore debug console. The STBY LED on board will light with RED color. NOTE: M33 wakeup A55 by using MU interrupt “GCR[GIR1]”. Please ensure the A55 already in SUSPEND mode, then press “W” button in Mcore debug console. Or you will meet call trace info in linux. Switch M33 Root Clock frequency: Press M for frequency switch. OD(Over dirve) mode frequency 250Mhz. ND(Norminal) mode frequency 200Mhz. The default frequency is 200Mhz. NOTE: Please do not perform M33 Root clock switching concurrently with A-core suspend operations! If we change the M-core root clock while the A-core is suspended, the function for M-core to wake up A-core will hang.

The log below shows the output of the power mode switch demo in the terminal window:

Start SRTM communication
Task 1 is working now

####################  Power Mode Switch Task ####################

    Build Time: Nov 10 2023--15:15:16
    Core Clock: 200000000Hz

Select the desired operation

Press  A to enter: Normal RUN mode
Press  B to enter: WAIT mode
Press  C to enter: STOP mode
Press  D to enter: SUSPEND mode
Press  W to wakeup A55 core
Press  M for switch M33 Root Clock frequency between OD/ND.

Waiting for power mode select..
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