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Slave USB HID device and firmware implementation method based on embedded Linux

It is a firmware implementation and embedded technology, which is applied in the direction of instruments, electrical digital data processing, etc., and can solve the problems of unrecognized plug events, USB bus reset process, hot plug function not supported, host and slave USB devices unable to communicate, etc. , to achieve the effect of improving stability and improving usability

Inactive Publication Date: 2009-12-02
NO 709 RES INST OF CHINA SHIPBUILDING IND CORP
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  • Abstract
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Problems solved by technology

However, using the above two design methods, under different host operating systems, the user needs to develop a driver to realize the communication between the USB peripheral device and the upstream host, and at the same time, the compatibility issue under different operating systems needs to be considered
In addition, these two methods do not support the hot-swapping function. When the device is plugged and unplugged, the firmware program on the slave device cannot recognize the plug-in event and the USB bus reset process, resulting in the firmware on the slave device being unable to re-initialize the USB bus. Cause host and slave USB device to be unable to communicate

Method used

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  • Slave USB HID device and firmware implementation method based on embedded Linux
  • Slave USB HID device and firmware implementation method based on embedded Linux
  • Slave USB HID device and firmware implementation method based on embedded Linux

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Embodiment

[0051] To illustrate with the accompanying drawings, the whole system is described in terms of hardware and firmware to achieve two major parts.

[0052] The hardware part adopts a computing device based on SoC technology, and the processor adopts an XSCALE processor based on ARM core. This chip has a slave USB control chip inside, supports 16 ports, and is configured and operated by software.

[0053] The firmware implementation mainly refers to the firmware system of the device, that is, the software system running in the CPU and the storage unit. The software system mainly includes: an embedded Linux operating system, a slave USB HID firmware driver, and a USB communication control program; among them, the slave USB HID firmware driver runs in the kernel space, and the USB communication control program runs in the user space.

[0054] The embedded Linux operating system has been transplanted for the specific hardware architecture. Linux provides a system call interface, a v...

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Abstract

The invention discloses a slave USB HID firmware implementation method based on embedded Linux, which comprises (1) an embedded Linux operating system, (2) a slave USB HID firmware drive program, and (3) a USB communication control program. By using the method, the development of a slave USB HID firmware system based on the embedded Linux can be finished quickly to achieve direct use by a user without developing and installing a drive program and without considering the problem of compatibility of different operating systems. The invention also aims to achieve data communication between a device and a host computer system in a USB HID protocol mode.

Description

technical field [0001] The invention relates to the fields of USB man-machine interface equipment and embedded Linux, in particular to a slave USB HID device and a firmware implementation method based on embedded Linux. Background technique [0002] USB (Universal Serial Bus) is an external bus connection between a host computer and peripheral devices. USB connects various types of devices with a single type of bus, mainly for medium-speed and high-speed peripherals, and connects with the internal system data line of the PC through the PCI bus to realize data transmission. USB is also a communication protocol specification, which defines a set of standards that any specific type of device can follow to support data transmission between the host (Host) and the device (slave device). The USB bus specification defines the specification of a Human Interface Device (HID, Human Interface Device) type device, and the HID specification specifically defines a protocol for communicat...

Claims

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Application Information

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IPC IPC(8): G06F13/10G06F13/38
Inventor 黄涌周俊谌菲
Owner NO 709 RES INST OF CHINA SHIPBUILDING IND CORP
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