Today the weather is good, in learning how to establish a register template and Hal library project template, picked up a development version can't wait the establishment of the project, copying routines in the code to compile and through st_link burn into the development version, try to run simple lantern and key control routines phenomenon brings joy, picked up the ucos system directly onto/32 development board, the mood.according I tried every function module, the curiosity is how to make a complete system so I took the question to b a great god play 32 video, a facial recognition locks with raspberry pie for face recognition and tracking, and 32 version development ucos as control, more and more interested in, although relatively stable c language foundation, but 32 code can't read, thought the whole code, learn the sentence by sentence, find the tutorials also find the baidu, discover and explain the tutorial code into, but in 32 video saw step-by-step review c language tutorial, opened the first GPIOA - & gt; CRL&=0 xffffff0f, learned - & gt; Is a structure pointer to the internal variables, this code is to use the value behind the direct and the CRL register and operation, equivalent to the CRL 4 to 7 in the register.

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