WIFI interface, ESP01S 
uses two CAN channels, the chip is the domestic SIT1042T. 
Verification effect, power supply test OK, using STC-ISP software, operation is consistent with the manual, but it is not recognized, and the STC USB Writer is not displayed. The board was resoldered once, but it is still the same. However, I am using the same chip. I suspect that the chip may be broken. I have been struggling with it for a long time, so I gave up on 
the physical pictures.
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