example TWR-MEM

[Microfelix]

hello,

I wanted to know if there are examples of the TWR-MEM with MQX.

thanks Maurizio

[DavidS]

I recently go the TWR-K60N512 kit working with the TWR-MEM Rev B card.

Please reference another thread:

https://community.freescale.com/message/301229

Regards,

David

[propellerhead99]

Have replaced TWR-MEM board with a new one. Still have same memory read/write problem. Addressability is correct. Simple peek/poke works correctly. Tried several read after write techniques and NOP delays to change timing. Far more errors are counted if I init the memory bits to one rather than zero. Writing with integer boundary rather than byte boundary does not change situation. 

I cannot reliably read/write to the TWR-MEM board work with the K60 tower and have submitted a support ticket.

[propellerhead99]

Re: memory test with the K60 tower and TWR-MEM board.

When I tested the TWR-MEM MRAM chip using the Freescale test software about 25% of the 512kb bytes were in error.

Freescale support reproduced the problem and verified that it is their problem. No answer as to

what will be their next step.

[monXii]

same problem here..

.. something new???

[monXii]

removing R14 is not enough!

Remove C2 too!

[propellerhead99]

I'm newbie to ARM and trying to utilize MRAM. Believe MRAM is interfaced as FlexBus which is addressed at x6000-0000. Looked over example of mfs/example/ramdisk (in Shell_Task) and don't understand how linker moved RAM_DISK_BASE to x6000-0000. It would seem the ram disk was allocated in SRAM. In what units is the ram disk size 0x1800?

Bill

[DavidS]

Hi Microfelix,

In general the TWR-MEM card was validated with the TWR-MCF52259.

If you open TWR-MCF52259 projects look for the MRAM target that is using the MRAM on the TWRMEM card.

Hope this helps.

Regards,

David

[Microfelix]

hello
thanks for the reply.
I have a TWR-K60N512.

I can also find here or should I download the card's documentation that you haveindicated?

[DavidS · Accepted solution]

Hello,

The Freescale MQX 3.7\mfs\examples\ramdisk\cw10\mfs_ramdisk_twrk60n512 example can be setup to access MRAM on the TWRMEM card.

I just haven't tried it yet.

Regards,

David

[Microfelix]

thanks Maurizio

[DavidS]

Hi Maurizio,

I was making a fast attemp to test the MRAM and found the following the TWR-K60N512.h:

/*
* MRAM cannot be reliably used on TWR_K60N512 due to a hardware conflict unless a hw modification is done:
* disconnecting IrDA receiver e.g. by removing R14 makes MRAM usage possible.
*/
//#define BSP_EXTERNAL_MRAM_RAM_SIZE          ((uint_32)__EXTERNAL_MRAM_RAM_SIZE)

I was able to add the TWR-MEM card to my K60 setup and access the MRAM OK.

Regards,

David

[Nana]

Maybe in next revision of the  TWR-K60N512 of the board the hardware engineers will put a jumper on that IR led to connect if I want to use that future or if I want to use an external ram memory.

This is only a suggestion i hope will be sent to the devs. 

Thank you,

Electronic and Software Engineer

Alexandru Nan

[LuisCasado]

Hello,

That modification is already done in TWR-K60 RevD. Is the actual production Tower.

Best Regards,

Luis

[propellerhead99]

Using TWR-MEM with K60 tower. Can read/write various MRAM locations with no issue but using a memory

test program in MRAM address space found many bit errors. Have made the IRDA R14 removal. TWR-MEM

jumpered J10 on, J11 off, J16 off.

Is my problem jumper configuration, bad board, or ? Does someone have this board/K60 working with no issues?

[Microfelix]

thanks david. Begin to test ...

maurizio