how to read and write to internal flash in STM32f303CB .

[KnarfB]

Doing that at register level is explained in the chips reference manual. For doing that at HAL level, there are examples included in the STM32Cube repository, online e.g. https://github.com/STMicroelectronics/STM32CubeF3/tree/master/Projects/STM32F303RE-Nucleo/Examples/FLASH/FLASH_EraseProgram

[OBEHE.1]

i have tried above example , but it failed during flash erase, please help

[waclawek.jan]

Which sector did you try to erase?

How exactly did it fail? How are the status bits set?

What is your hardware, a Nucleo board?

JW