How to use NVM and EEPROM partition in S32k146?

[s32k146_ige]

Hi,

I am using S32K146.

I want to use 4Kb EEPROM and 64Kb NVM partition in my project, i tried running code example flash_partitioning_s32k146, which helped me use EEPROM partition.

But i am unable to Write or erase in NVM, The D_Flash size is 0 [ data flash 0 kb emulated eeprom backup 64kb ]as per the flex nvm partition, so the operation is failed.

How to configure the flex nvm partition ? 

Thanks

[s32k146_ige]

Hey Hi @Robin_Shen 

Thanks, This worked, I have one more question?

How to write in 32kB backup eeprom like what should be address ? and how to read back data from NVM(DFlash) or EEPROM ? 

[Robin_Shen]

When using the EEPROM of S32K1xx, user does not need to write to the EPROM backup address. It is recommended that you read AN11983 Using the S32K1xx EEPROM Functionality

[s32k146_ige]

Dear @Robin_Shen
i am unable to understand here concept of backup EEPROM, i did read the said application note, but failed to grasp if i am using partition setting as 32KB EEPROM and 32kb NVM (DFlash), what actually happens to 32KB EEPROM, as i am going to use bootloader 16KB of NVM is going to be used as Bootloader, so i am left with 16KB of DFlash, but what happens to 32KB backup EEPROM ?

[Robin_Shen]

The training video  Benefit from FlexNVM Flash Block Memory in S32K MCUs introduces Emulated EEPROM from 10:08

Hope it helps.

[Robin_Shen]

Hi 

That example configure FlexNVM for maximum E-Flash size 64K

 * - EEEDataSizeCode = 0x02u: EEPROM size = 4 Kbytes
* - DEPartitionCode = 0x08u: EEPROM backup size = 64 Kbytes */
ret = FLASH_DRV_DEFlashPartition(&flashSSDConfig, 0x02u, 0x08u, 0x0u, false, true);

You can Split FlexNVM for D-Flash(32Kbytes) and E-Flash(32Kbytes):
ret = FLASH_DRV_DEFlashPartition(&flashSSDConfig, 0x02u, 0x03u, 0x0u, false, true);

Best Regards,
Robin
-------------------------------------------------------------------------------
Note:
- If this post answers your question, please click the "Mark Correct" button. Thank you!

- We are following threads for 7 weeks after the last post, later replies are ignored
Please open a new thread and refer to the closed one, if you have a related question at a later point in time.
-------------------------------------------------------------------------------

[s32k146_ige]

Hey Robin thanks for reply,

So going by current configuration, my MCU is configured for 64Kb + 4Kb of EERPOM ? is that right ?

Also how do i access the 64Kb of EEPROM ? as i have checked i can write on 4Kb of EEPROM only 

        /* Configure FlexRAM as EEPROM and FlexNVM as EEPROM backup region,
         * DEFlashPartition will be failed if the IFR region isn't blank.
         * Refer to the device document for valid EEPROM Data Size Code
         * and FlexNVM Partition Code. For example on S32K146:
         * - EEEDataSizeCode = 0x02u: EEPROM size = 4 Kbytes
         * - DEPartitionCode = 0x08u: EEPROM backup size = 64 Kbytes */
        ret = FLASH_DRV_DEFlashPartition(&flashSSDConfig, 0x02u, 0x08u, 0x0u, false, true);
        DEV_ASSERT(STATUS_SUCCESS == ret);

As per mentioned by You, i also tried doing following changes

ret = FLASH_DRV_DEFlashPartition(&flashSSDConfig, 0x02u, 0x03u, 0x0u, false, true);

but this function return Error (0x1) and code is stuck in assert condition. i have attached screenshot of flashSSDConfig variable data.

[Robin_Shen]

That example configure all 64 kB FlexNVM as EEPROM backup. But you want to configure 32 kB FlexNVM as Data Flash and 32kB as EEPROM backup? so:
ret = FLASH_DRV_DEFlashPartition(&flashSSDConfig, 0x02u, 0x03u, 0x0u, false, true);

Please notice the NOTE of that example: