writing flash of KEAZN64 M0+ device via SWD

danielrickers · ‎03-19-2019

Hello,

I want to flash a KEAZN64 M0+ device via SWD. This should be realized by a host processor instead of a programmer so I have to implement the host code.

The protocol basics are working and I'm already able to write and verify data in the RAM via AHB-AP but not yet into flash.

To do that I have to erase the flash first, but what is the correct sequence?

I use an appnote from another vendor AN0062 link as base and try to adapt it to the NXP KEA M0+ target.

I chose the simple variant (direct write to msc registers) without a flash driver that is loaded into the target RAM to keep it as simple as possible.

I traces the communication between the KEAZN64 and a programmer (PE Micro universal FX) but it’s hard to find the correct sequence part for erase and flash.

Maybe you can help me?

Thanks a lot

Daniel

Alexis_A · ‎03-22-2019

Hi Daniel,

Please check the KEA64 Sub-Family Reference Manual section:

18.3.4.2 Command write sequence

This section explain the sequence to program the flash.

Best Regards,

Alexis Andalon

danielrickers · ‎03-25-2019

Hej Alexis ,

thanks a lot for the answer.

Do I have to halt or reset the controller before I make the full erase?

Thanks

Daniel

Alexis_A · ‎03-27-2019

Hi Daniel,

If you already execute the SWD sequence to enable the comunication, it doesn't need it..

Best Regards,

Alexis Andalon

danielrickers · ‎05-07-2019

Hi Alexis ,

thanks a lot. the description helps to create a flash sequence.

the problem no is that I always get a ACK_WAIT when I try to access the FTMRH registers

Do I need other AP settings?

thanks a lot

Daniel

Request AccessPort Write CSW

Turnaround

ACK OK

Turnaround

WData 0x22000012 reg CSW bits DbgSwEnable=0

Data parityok

Trailing bits

Request AccessPort Write TAR

Turnaround

ACK OK

Turnaround

WData 0x40020000 reg TAR

Data parityok

Trailing bits

Request AccessPort Read DRW

Turnaround

ACK OK

WData 0x00000000 reg DRW

Data parityok