STM32WLE5 cannot write to FLASH

[Foreen]

Hello,

I'm encountering an issue when trying to write data to the flash memory on the STM32WL5C8U6. I'm using the official driver implementation (V1.3.1) and the following sequence of commands:

1. HAL_FLASH_Unlock()

2. FLASH_Program_DoubleWord(0x08030000UL, <data>)

3. HAL_FLASH_Lock()

The problem is that the data is only written to flash the first time I run this sequence on the chip. On subsequent attempts, no data is written. I’ve also tried calling FLASH_PageErase(0x30) before writing, but that didn’t resolve the issue. Additionally, I attempted to reset the flash to 0xFFFFFFFF manually, which seemed to help intermittently, but I have been unable to reproduce this reliably.

Does anybody have any suggestions on what might be going wrong? Are there any working examples for this chip?

Thank you in advance!

[TDK]

HAL_FLASH_Program is used to program, not FLASH_Program_DoubleWord.

HAL_FLASHEx_Erase is the correct function to use to erase a page, not FLASH_PageErase.

Flash can only be written once before it must be erased.

Here's an example that uses both of these correctly:

STM32CubeWL/Projects/NUCLEO-WL55JC/Examples/FLASH/FLASH_EraseProgram/Src/main.c at 249cbca4a1b13c5f0cf3a1b6413f356a6e52b7a2 · STMicroelectronics/STM32CubeWL