https://blog.csdn.net/QWQ_DIODA/article/details/116712401
The value of the register, such as the TC flag of SR, is changed by hardware. If you want to monitor the changes of these values in the software, you need _IO
The meaning of __IO in STM32 keil
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Origin blog.csdn.net/weixin_44057803/article/details/129546460
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