Electronic equipment and its master-slave switching method and device

Abstract

The invention provides an electronic device and a master-slave switching method and apparatus thereof. The master-slave switching method comprises the following steps: receiving a USB (Universal Serial Bus)_ID pin signal of a central processing unit in the electronic device, pin USB_ID of the central processing unit being grounded; judging whether another electronic device connected with the electronic device is a master device or not; when the other electronic device is not the master device, sending the USB_ID pin signal to the central processing unit; when the other electronic device is the master device, receiving a slave device switching instruction, and not sending the USB_ID pin signal to the central processing unit to switch the electronic device into a slave device according to the slave device switching instruction. According to the electronic device and the master-slave switching method and apparatus, the electronic device can be freely switched into the master device and the slave device, the reliability of a USB application is enhanced, the failure risk of the ID pin of the central processing unit is lowered, a PCB (Printed Circuit Board) wiring design space and OTG (On-The-Go) transfer cables are saved, and the switching cost is reduced.

Description

Technical field [0001] The present invention relates to the technical field of electronic equipment, in particular to a master-slave switching method of electronic equipment, a master-slave switching device of electronic equipment, and an electronic equipment. Background technique [0002] At present, OTG (On-The-Go, mainly used in the connection between various electronic devices for data exchange) technology is to realize data transmission between different electronic devices without a Host (host device) . The OTG protocol stipulates that two electronic devices can only have one Host and one Device (slave device) at the same time during data transmission. Among them, according to the USB (Universal Serial Bus, universal serial bus), such as the ID pin of USB2.0, the roles of two electronic devices are distinguished, that is, the electronic device with the ID pin grounded is the Host, and the electronic device with the ID pin floating (internally pulled high) For Device. [000...

AI Technical Summary

Problems solved by technology

[0005] However, the technical solution in the related art needs to add an OTG transfer wire when the role of the electronic device is changed, which will lead to an increase in cost, an increase in the DC impedance of the VBUS' path of the electronic device, and a decrease in the quality of the D'+ data signal and D'-data signal. Poor, in severe cases, it will lead to abnormal charging detection of electronic devices, failure to read storage devices, etc.

In addition, if the USB socket enters debris, sweat, rain and other liquids that will cause electrical corrosion, the impedance of the ID' pin to the ground will be lowered, or even short-circuited to the ground. At this time, the ID' pin will fail, and the electronic device will enter the Host, and The role cannot be converted to Device, and the electronic device cannot be charged until it is turned off after the power is exhausted.

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