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circuit for realizing hardware autonomous switching by connecting three pieces of equipment through a USB port

A technology for autonomous switching and equipment, which is used in electrical digital data processing, instruments, etc.

Active Publication Date: 2019-05-24
SHANGHAI HUACE NAVIGATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (4) When connecting with a computer, U disk, or B device, the communication object can only be automatically switched through hardware

Method used

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  • circuit for realizing hardware autonomous switching by connecting three pieces of equipment through a USB port
  • circuit for realizing hardware autonomous switching by connecting three pieces of equipment through a USB port
  • circuit for realizing hardware autonomous switching by connecting three pieces of equipment through a USB port

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Experimental program
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Embodiment 1

[0021] Embodiment 1, with reference to Figure 1-Figure 4 As shown, in the present invention, the default status confirms:

[0022] In the USB protocol, the USB is the master device, the ID must be low, and the power is supplied externally. When working as a slave device, the ID is suspended or high level, and the power is supplied by the master device;

[0023] The PC side is usually only the master device, VBUS is 5V, ID is suspended or high;

[0024] U disk, usually need OTG line to connect with other devices, ID is low, VBUS is suspended.

[0025] In the default state, COMA is not connected to the U disk and PC, the ID1 of COMA is pulled up to high level by the internal 5V of the system, VBUS is pulled down to low level by the internal system of the system, ID and VBUS make the ID2 of the system CPU low through the logical AND gate At the same time, the VBUS of COMA keeps the USB switch to COMB, and connects to the B device. Realize communication with B equipment. The...

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Abstract

The invention provides a circuit for realizing automatic switching of hardware by connecting three USB (Universal Serial Bus) ports, which is characterized in that in a USB protocol, a USB is used asmain equipment, the ID (Identity) is required to be low, and power is supplied to the outside; When the slave device is made, the ID is suspended or at a high level and is powered by the master device; The PC end is usually only used as main equipment, the VBUS is 5V, and the ID is suspended or has a high level; The USB flash disk usually needs to be connected with other equipment through an OTG line, the ID is low, and the VBUS is suspended; Default state, the COMA is not connected with the USB flash disk and the PC; wherein the ID1 of the COMA is pulled up from 5V inside the system to a highlevel, the VBUS is pulled down from the inside of the system to a low level, the ID and the VBUS enable the ID2 of a CPU of the system to a low level through a logic AND gate, and meanwhile, the VBUSof the COMA enables a USB switch to be kept at the COMB and is connected with B equipment; Communication with equipment B is realized; And the VBUS of the device B continuously supplies power, the IDis suspended, autonomous master-slave switching is realized, and time-sharing communication with one master device of the two slave devices is realized.

Description

technical field [0001] The invention relates to the fields of digital circuit design and automatic control, in particular to a circuit for realizing hardware autonomous switching by connecting three devices with a USB port. Background technique [0002] The existing USB technology is very mature, and the USB port expansion technology is also mature, but the extended interface can usually only be used as a master device and cannot be used as a slave device. Such a situation: [0003] (1) There is only one USB OTG interface, which needs to be connected to the computer as a slave device; [0004] (2) Connected with a U disk, it can communicate with the U disk and act as the main device; (The U disk and the computer have the same interface, named COMA); [0005] (3) When it is not connected to the U disk or computer, it needs to communicate with the B device and act as the master device; [0006] (4) When connecting with a computer, U disk, or B device, the communication obje...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40G06F13/42
CPCY02D10/00
Inventor 杨荣仕顾金霞李朝阳王晓波朱敏王诚程广茂石磊
Owner SHANGHAI HUACE NAVIGATION TECH
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