The question is this:

Homemade USB to UART serial port, using CP2102 chip, plug in the computer port, can display the COM number, but after about 5 seconds will automatically disappear, is that there is no port number, even unable to identify USB device "" this kind of mistakes all have no,

Circuit, after the electricity, voltage is measured with a multimeter, 4.7 5 V input voltage is normal, within a CP2102 has a 3.3 V voltage regulator, 3.3 V and stable output,

There are leaders met such question? Save the children.

CodePudding user response:

A preliminary judgment, poor contact

CodePudding user response:

Recently the whole printer, printer somehow not also happen!!!!!!