MDM-AP Status register reading while the PKE02Z64 device held in reset

[guide19]

Hi,

I am wondering if it is normal behaviour when the MDM-AP Status register is not possible to read while the PKE02Z64 device is held in reset.

I get only return value of MDM-AP status  0x00000000. Is this the correct situation?

Writing and reading of the MDM-AP Control is OK while in reset. 

After releasing reset, the MDM-AP Status return correct values.

BR,

Jozef

[pgo · Accepted solution]

Hi Josef,

I had a look at this with FRDM-KE02 and FRDM MK20 boards using the USBDM TCL interpreter.  I got the following results:

For a FRDM-KE02

% stat
Found 1 devices
USBDM DLL Version = 4.10.6.100
BDM Version = HW=59, SW=4A
USBDM DLL Version = 4.10.6.100
BDM Version = HW=59, SW=4A
:setTarget ARM
:connect
With reset low
:pinSet 0x8
:rCreg r=0x1000000(MDM_AP.Status)->0x00000000
:rCreg r=0x1000004(MDM_AP.Control)->0x00000000
:rCreg r=0x10000FC(MDM_AP.Ident)->0x001C0020
With reset high
:pinSet 0x4
:rCreg r=0x1000000(MDM_AP.Status)->0x0001000A
:rCreg r=0x1000004(MDM_AP.Control)->0x00000000
:rCreg r=0x10000FC(MDM_AP.Ident)->0x001C0020

FRDM-MK20

% stat
Found 1 devices
USBDM DLL Version = 4.10.6.100
BDM Version = HW=59, SW=4A
USBDM DLL Version = 4.10.6.100
BDM Version = HW=59, SW=4A
:setTarget ARM
:connect
With reset low
:pinSet 0x8
:rCreg r=0x1000000(MDM_AP.Status)->0x00000032
:rCreg r=0x1000004(MDM_AP.Control)->0x00000000
:rCreg r=0x10000FC(MDM_AP.Ident)->0x001C0000
With reset high
:pinSet 0x4
:rCreg r=0x1000000(MDM_AP.Status)->0x0001003A
:rCreg r=0x1000004(MDM_AP.Control)->0x00000000
:rCreg r=0x10000FC(MDM_AP.Ident)->0x001C0000
1835008

This was using the following TCL script:

set ::status  0x01000000
set ::control 0x01000004
set ::idreg   0x010000FC

proc stat {} {
   openbdm
   settarget arm
   connect
   puts "With reset pin low"
   pinSet rst=0
   rcreg $::status
   rcreg $::control
   rcreg $::idreg
   puts "With reset pin 3-state"
   pinSet rst=3
   rcreg $::status
   rcreg $::control
   rcreg $::idreg
}

This would confirm your conclusion that the mdm-ap-status register reads zero when the device is being held in reset by the reset pin.  This is different from the MK20.

bye

[guide19]

Hi pgo,

thanks for your asnwer. It looks like the MDM-AP status register of the MKE device is not readable while in reset from some reason.

BR,

Jozef

[kerryzhou]

Hi Jozef Prokopovic,

    Thank you for your question in our community! I'd like to serve you!

    Actually,MDM-AP status register can be read out when the device is held in reset.

  So, I think may be your read method is not right.

  If you use jlink debugger, Please do your operation according to the following script on jlink commander:

usb
h
r0 //system reset
swdwritedp 2, 0x01000000           //select MDM-AP
sleep 10
swdreadap 0
sleep 10
swdreadap 0 // read MDM-AP register 0
sleep 10
swdreadap 1
sleep 10
swdreadap 1 // read MDM-AP register 1
sleep 10
swdwritedp 2, 0x00000000           //select AHB-AP
r1 //system reset release

When you read the register, please read twice, I think you just not read it out .

Wish my answer will help you!

If you still have question, please let me know!

Best regards!

Jingjing

[dry]

Hello,

Which hw debugger is this the script for?

Is this for MDM-AP or DAP?

[kerryzhou]

Hi D.RY,

   It is using the JLINK debugger.

Best Regards,

Kerry

[dry]

Segger's Jlink?

Is that script for JLink commander? Sorry just dont' recognize the steps.  Also, is that the debug Access Port you accessing?

[kerryzhou]

Hi D.RY,

Yes, Segger's JLINK, then use the JLINK commander to type the according command, I use the debug to access it.You can try it on your side.

Best Regards,

Kerry

[guide19]

Hi Jingjing,

I think that the read method is OK at least for MKL devices, where can I read out the MDM-AP status even when the device is held in reset.

BR,

Jozef

[kerryzhou]

Hi Jozef Prokopovic,

    I am sorry for my later reply!

    Actually,reading the MDM-AP status register of KE is different from other series chip, after communicate with our expert, their advice just like the following:

   If Pin reset hold 0, MDM-AP register can’t load from NVM or core in KE family. But you can try to generate system reset by MDM-AP Control register bit3. In this case, it’s ok to read MDM-AP Status register:

   Please do the following script on jlink commander:

usb
r
swdwritedp 2, 0x01000000           //select MDM-AP
sleep 10
swdreadap 0
sleep 10
swdreadap 0      
sleep 10
swdreadap 1
sleep 10
swdreadap 1
sleep 10
swdwriteap 1, 0x00000008           //generate system reset;
sleep 100
swdreadap 0
sleep 10
swdreadap 0                        //read MDM-AP reg0 in reset   =>0x03000052
sleep 10
swdreadap 1
sleep 10
swdreadap 1                        //read MDM-AP reg1     =>0x00000008
sleep 10
swdwriteap 1, 0x00000000             //release MDM system reset quest
sleep 100
swdreadap 0
sleep 10
swdreadap 0
sleep 10
swdreadap 1
sleep 10
swdreadap 1
sleep 10
swdwritedp 2, 0x00000000           //select AHB-AP
r

After do like that, you can read the MDM-AP status register out.

I  wish it helps you!

Best regards!

Jingjing