C40 Code Memory Allocation – Hard Fault When Changing Sector

GaneshBhagwat — Tue, 12 Aug 2025 16:26:39 GMT

I’m working with the C40 flash memory driver and used the following configuration, which works fine with the default project settings:

#define EXAMPLE_MASTER_ID         (0U)
#define EXAMPLE_SECTOR_START_ADDR (0x00600000U)
#define EXAMPLE_SECTOR_TEST       (C40_CODE_ARRAY_0_BLOCK_1_S256)
#define EXAMPLE_BUFFER_SIZE       (64U) // or 128U

However, when I change the settings to:

#define EXAMPLE_MASTER_ID         (0U)
#define EXAMPLE_SECTOR_START_ADDR (0x00500000U)
#define EXAMPLE_SECTOR_TEST       (C40_CODE_ARRAY_0_BLOCK_0_S128)
#define EXAMPLE_BUFFER_SIZE       (64U) // or 128U

the program hits a hard fault.

Could anyone clarify what might cause this issue?
From my understanding, possible causes could be:

The selected start address overlaps with a protected or reserved flash region.
The sector/block size definition (C40_CODE_ARRAY_0_BLOCK_0_S128) doesn’t match the actual memory map for the device.
Attempting to write or erase from a block where the code is currently executing.
Misalignment with the flash controller’s sector boundaries.

I’ve attached an image showing the issue in more detail.

Thanks and Regards,

Ganesh Bhagwat

Re: C40 Code Memory Allocation – Hard Fault When Changing Sector

Senlent — Wed, 13 Aug 2025 06:29:53 GMT

Hi@GaneshBhagwat

This should be an Read-While-Write Event Error(RWE), you need to put flash operation into SRAM to avoid RWE.

Please refer to this post:

https://community.nxp.com/t5/S32K-Knowledge-Base/S32K312-C40-Ip-SRAM-RTD-500-DS35/ta-p/2074245

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C40 Code Memory Allocation – Hard Fault When Changing Sector

Re: C40 Code Memory Allocation – Hard Fault When Changing Sector