Program DCF for S32K358

[bryan-jeong]

Hello,
I was wondering how to program additional bytes in the DCF for the S32K358. I understand I need to change the UTEST address to change my clock option for HSE-B SW, but I can't get my desired value into flash. I was wondering if there was a way to put in the value using a T32.

Thanks in advance

[VaneB]

Hi @bryan-jeong 

To write data in the UTEST Sector, the process is the same as used to program data in other blocks. IMPORTANT, to write data first, you need to unlock the sector using the PFCBLKU_SPELOCK[SLCK] register.

It is important to mention that the UTEST Sector is an OTP (One Time Programmable). This causes the erase operations not to be allowed. You only going to be able to append new data or configuration and read data.

BR, VaneB

[ovidiubriscan]

Hi Bryan, for T32 here a small example of how to write into UTEST (it is from an S32K344 uC which i guess is more or less same platform as yours) : 

; Program UTEST in order to activate HSE_B usage
do ~~\demo\arm\flash\s32k3.cmm prepareonly
flash.Program 3. /OTP
Data.Set SD:0x1B000000--0x1B000007 %LE %Long 0xAABBCCDDDDCCBBAA
flash.Program off

Hope this helps.