STM32L1系列内部FLASH写之前是要擦除地，擦除后内容是00，你可以使用STLINK utility看看。
Program memory Fast Word Write
This operation is used to write a word to the program memory, assuming that it was
previously erased. To do so:
• Unlock the FLASH_PECR register
• Unlock the Program memory
• Write a word to a valid address in the program memory. This activates a programming
phase |
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