What is the working process of USB interface?

1, USB device access. The +5V power supply in USB interface can not only provide small current supply for external settings, but also play the role of detection. When the USB setting is plugged into the USB interface, the host's +5V power supply will be connected to the USB device through the USB sideline. The control chip of the USB peripheral will check whether the USB device is connected to the USB port of the host through two resistors of 10K. If one of these two pins is high and the other is low, it means that the USB peripheral has been normally connected to the USB interface. At this time, the peripheral control chip starts to work, and sends out data through data+ and data-. At this point, after receiving the data, the host will prompt to find new hardware and start installing new hardware drivers.

2. Identification of 2.USB devices. When the USB peripheral sends out data, it includes the name of the device and the model of the device itself. According to this information, the host displays the name and model of the discovered new hardware on the display. One more word: If the price of flash memory is lower now, we can store the drivers of scanners, printers and digital cameras in our devices. When the host needs to be driven, it can be read directly from the inside of the device, and there is no need to drive the CD and install the driver.