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low_power_demo in - could not wake up from sleep.

Question asked by M Joa on Dec 17, 2014


I am using the application low_power_demo from official package KL05- to test deep sleep/wakeup on FRDM_KL05z. Somehow, after selecting a particular low power mode other than VLPR, VLLS0-1, VLLS0-2, MCU goes to sleep/stop but could not wake up after lptmr expires. I would expect MCU will be waken up after 10s  and execute the next instruction.

I have done the following tests:


(1) use original outfile.s19 under KL05-SC\klxx-sc-baremetal\build\keil\low_power_demo by dragging and dropping image  into the FRDM-KL05Z drive. The above problem appears with this trace:


Enter the key number to choose one mode: 4

enter into stop mode--


MCU just stuck there until reset button is pressed.


(2) build outfile.s19 using keil and run the image by dragging and dropping image into the FRDM-KL05Z drive as well as using Keil debugger. The same problem appears. MCU could not wake up.


(3) use low_power_demo.srec from FRDM-KL05Z_QSP Quick Start Package. MCU COULD wake up properly.



I am really puzzled why the original image under KL05-SC\klxx-sc-baremetal\build\keil\low_power_demo could not run properly on my FRDM_KL05z board whereas the one from FRDM-KL05Z_QSP Quick Start Package could run properly.


Is there anything I am missing?

Thanks a lot



The Hardware Information:

Board Name is: FRDM-KL05Z

MicroBoot Kernel Version is: 1.03

Bootloader Version is: 1.11

Installed Application: PEMicro FRDM-KL05Z Mass Storage/Debug App

Application Version is: 1.14


I am using MSD-DEBUG-FRDM-KL05Z_Pemicro_v114.SDA. Attached please find 3 traces:

1. low_power_mode_org_1.txt - trace using original outfile.s19 under KL05-SC\klxx-sc-baremetal\build\keil\low_power_demo

2. low_power_mode_org_build_1.txt - trace using outfile.s19 that is built under KL05-SC\klxx-sc-baremetal\build\keil\low_power_demo using keil

3. low_power_mode_1.txt - trace using low_power_demo.srec from FRDM-KL05Z_QSP Quick Start Package.


From trace 1 and 2, it seems MCU is reset and could NOT be waken up after LPTMR expires

Original Attachment has been moved to:

Original Attachment has been moved to:

Original Attachment has been moved to: