Method for responding to USB slave device by USB master device and related device

Abstract

The embodiment of the invention provides a method for responding to a USB slave device by a USB master device and a related device. The method comprises the following steps of using the USB slave device to receive a first instruction inputted through the input device; generating an interrupt signal according to the first instruction; outputting the interrupt signal to the master USB slave device through the auxiliary pin of the first USB interface; when the USB main device detects that the level signal of the auxiliary pin in the second USB interface is an interrupt signal, powering on the second USB module to enable the suspended USB bus to recover to a normal working state; using the USB slave device to send a first instruction to the USB master device through the differential signal pinof the first USB interface; furthermore, using the USB master device to receive the first instruction through the differential signal pin of the second USB interface and execute the first operation,so that the USB master device in a suspended state responds to the USB slave device instruction.

Description

technical field [0001] The invention relates to the field of electronic communication, in particular to a method for controlling a USB slave device and related devices. Background technique [0002] Universal Serial Bus (USB) is an external bus standard used to regulate the connection and communication between computers, mobile phones, etc. and external devices. The USB interface supports the plug-and-play and hot-swap functions of the device. [0003] A USB device (such as a USB master device or a USB slave device) can support the suspend state, and can enter the suspend state from any level state, so that the USB bus stops data transmission. When the USB device finds that the idle state duration on the USB bus exceeds 3.0ms, the USB controller of the USB device can be powered down, and the USB physical layer module (USB PHY) can be powered down, thereby entering a suspend (suspend) state to reduce The energy consumption of the equipment. [0004] When the USB controller...

AI Technical Summary

Problems solved by technology

[0004] When the USB controller, USB physical layer module, etc. enter the suspended state, data cannot be transmitted between the USB master device and the USB slave device, and the USB master device cannot respond to the operation instructions of the USB slave device. When the volume is increased, the USB slave device cannot send this command to the USB master device, and the USB master device cannot respond to the command

[0005] If the USB master device needs to respond to the commands sent by the USB slave device in a timely manner, the USB controller and USB PHY of the USB master device and the USB controller and USB PHY of the USB slave device need to be kept powered on, resulting in high power consumption of the USB device.

Images