First, it is best to test your Customized USB interface circuit. USB flash disk interface circuit, this circuit does not have any particular elements it is just two knowledge strains D + and D-, it is advisable to measurement knowledge cable to the line between the grasp whether working or not. Generally talking, between the data line and the principle control circuit linked in collection to 2 small resistors with a view to play a task in safety, so you wish to test whether or not these two resistors is working effectively. Second, Test the Clock circuit of your custom USB drive USB and pc communications in a sure frequency, If the working frequency of USB and computer cannot sync, then the system will think that is an “unrecognized gadget”. Presently, we must always change the crystal. The actual upkeep has many examples of crystal injury.
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