X-NUCLEO-PGEEZ1 M95P32 extended operations

Overview

This sample demonstrates the M95P32-specific flash operations exposed through the Flash API flash_ex_op() extension:

  • Read the 1024-byte identification area with RDID (0x83).

  • Write and read back a pattern in the customer identification page with WRID (0x82), and verify that a write crossing its boundary is rejected.

  • Read across the factory/customer identification-page boundary.

  • Compare standard page programming through flash_write() with PGPR (0x0A) page program with buffer load over two independently erased 64-KiB main-array regions. The sample times only each write call, then reads back both regions to verify their contents.

The page-program-with-buffer-load operation enables and disables the M95P32 buffer mode internally using its volatile register. Direct volatile-register access is not part of the public API.

Warning

The sample modifies the customer identification page at offset 0x200 and erases the main-array regions from 0x3e0000 to 0x3fffff. Do not run it when this region contains data that must be preserved.

Building and Running

Build the sample for a NUCLEO-U575ZI-Q with the X-NUCLEO-PGEEZ1 shield:

west build -b nucleo_u575zi_q --shield x_nucleo_pgeez1 samples/shields/x_nucleo_pgeez1
west flash

Sample Output

[00:00:00.000,000] <inf> ospi_stm32: MSPI config result: success
*** Booting Zephyr OS build v4.4.0-11617-g2189ec6da640 ***
M95P32 extended operation test

==================== READ: Factory identification page ====================
Identification page [0x000..0x00f]: 20 00 16 00 ff ff ff ff ff ff ff ff ff ff ff ff

==================== READ: Customer identification page before clear ====================
Customer identification page before WRID [0x200..0x20f]: 4d 39 35 50 33 32 2d 65 78 2d 6f 70 2d 74 65 73

==================== WRITE: Clear customer identification page ====================
Clearing customer identification page [0x200..0x20f]: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

==================== READ: Customer identification page after clear ====================
Customer identification page after clear [0x200..0x20f]: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

==================== WRITE: Customer identification page ====================
Writing customer identification page [0x200..0x20f]: 4d 39 35 50 33 32 2d 65 78 2d 6f 70 2d 74 65 73

==================== READ: Customer identification page after WRID ====================
Customer identification page after WRID [0x200..0x20f]: 4d 39 35 50 33 32 2d 65 78 2d 6f 70 2d 74 65 73

==================== READ: Identification page boundary ====================
Identification page boundary [0x1f8..0x207]: ff ff ff ff ff ff ff ff 4d 39 35 50 33 32 2d 65

==================== WRITE: Cross-page protection ====================
Cross-page WRID protection passed

Identification page read/write passed

==================== PREPARE: Erase write benchmark regions ====================

==================== WRITE: Standard page program ====================
Standard page program data verification passed

==================== WRITE: Page program with buffer load ====================
Page program with buffer load data verification passed

==================== RESULT: Write performance ====================
Standard page program (65536 bytes): 21752449 cycles, 0.135952 s
Page program with buffer load (65536 bytes): 17151523 cycles, 0.107197 s
Page-program-with-buffer-load speedup: 1.26x (21.1% less write time)
M95P32 extended operation test passed