1. The internal flash write operation of stm32 can only write two bytes, not one byte at a time
2. Erase is required before writing, and all data after erasing are FF
3. The internal flash is 512kb for large capacity, and less than 512 for small capacity. In the stm32f10x_flash.c of stm32, the FLASH_Status FLASH_ErasePage erase page function is different from erasing 2k or 1k. Large capacity erases 2k, and small capacity erases 1k
4. Reading can read only one byte, for example: *(uint8_t*)(Address)
5. In my code, there is no delay function added to the erase and write process, because there is already a function in the library function to ensure the completion of the operation.
6. Call the unlock function before erasing.
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