topic Re: How to use NVM and EEPROM partition in S32k146? in S32 SDK

How to use NVM and EEPROM partition in S32k146?

s32k146_ige — Wed, 22 Feb 2023 05:33:23 GMT

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

Re: How to use NVM and EEPROM partition in S32k146?

Robin_Shen — Wed, 22 Feb 2023 07:29:05 GMT

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
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Re: How to use NVM and EEPROM partition in S32k146?

s32k146_ige — Wed, 22 Feb 2023 10:56:26 GMT

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.

Re: How to use NVM and EEPROM partition in S32k146?

Robin_Shen — Thu, 23 Feb 2023 09:10:53 GMT

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:

Re: How to use NVM and EEPROM partition in S32k146?

s32k146_ige — Thu, 23 Feb 2023 09:28:49 GMT

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 ?

Re: How to use NVM and EEPROM partition in S32k146?

Robin_Shen — Fri, 24 Feb 2023 09:18:14 GMT

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

Re: How to use NVM and EEPROM partition in S32k146?

s32k146_ige — Mon, 27 Feb 2023 05:32:45 GMT

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 ?

Re: How to use NVM and EEPROM partition in S32k146?

Robin_Shen — Tue, 28 Feb 2023 01:50:51 GMT

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

Hope it helps.