CN1504887A - Universal serial bus port testing device and method - Google Patents

Abstract

The invention discloses a USB port testing method, which is used for testing the working condition of the USB port of a host. The USB port of the host communicates with a test chip in a test circuit through an interface circuit. First, a USB device driver is loaded; then the USB devices are searched and their number is determined; then the device configuration information is read in sequence; finally, the working condition of the USB port is judged according to the reading result. The invention uses a simple hardware circuit to test the quality of these connections without using a USB device, which can greatly save costs and also avoids judgment errors caused by abnormal operation of the USB device.

Description

Universal serial bus port testing device and method thereof

technical field

The invention relates to a device and method for testing the quality of a computer universal serial bus (USB) port through a simple circuit device.

Background technique

Universal Serial Bus (Universal Serial Bus, USB) is a new generation of peripheral device interface, which is jointly developed by seven hardware and software manufacturers such as Intel, Compaq, NEC, DEC (Digital), IBM, Northern Telecom, and Microsoft. , the transmission rate of this interface has two forms of 1.5Mbps and 12Mbps, because its transmission rate is much faster than the parallel port or serial port used by personal computers, so USB is very important for the transmission of computer equipment and peripheral interfaces. Efficiency will be significantly improved.

USB consists of four wires D+, D-, Ground and VCC. According to the different connection methods of D+ and D-, high and low speed devices can be connected. The USB port is a standard computer expansion port. Most expansion devices must pass through this port to provide the functions of the device to the computer. Through USB, different types of peripheral devices can be connected to the computer, such as: USB mouse, USB keyboard, USB Speakers, USB joysticks, USB CD drives, USB scanners, etc.

The currently used test method is: the test of the port is currently carried out using high-speed and low-speed USB devices respectively. A USB device (such as: USB hard disk) is directly inserted into the USB port of a personal computer. device to determine the online status on the USB port, but this technique has a number of disadvantages. If the price is more expensive, the structure is complicated, and the test is more troublesome. Therefore, in the face of this situation, there is a great need for an easy and convenient method to solve this problem.

Contents of the invention

The purpose of the present invention is to provide a simple and effective test device and method thereof for testing the quality of the USB port connection on the motherboard of a personal computer, and judge whether the computer USB port is good or bad by whether the access operation to the test device can be successful.

In order to achieve the above object, the present invention provides a USB port testing method, which is used to test the working conditions of the USB port of the host computer. First, load the USB device driver, then search for the USB device, and determine its number, and then read the USB device in turn. Get the configuration information of the device, and finally judge the working condition of the USB port according to the reading result.

The present invention also provides a USB port testing device for testing the working condition of the USB port of the host, which includes an interface circuit connected with the USB port of the host, a test circuit connected with the interface circuit, and It consists of a test chip and its peripheral components, wherein the USB port of the host computer communicates with the test chip in the test circuit through the interface circuit.

The beneficial effect of the present invention is that the USB device in the prior art is replaced by the test circuit, the quality of the USB port of the computer is judged by reading the configuration information of the test circuit, and the quality of the USB port is tested by using a simple hardware circuit , avoiding the complexity of the testing method in the prior art, without using the USB device, which can greatly save the cost, and also avoid the error in judgment caused by the abnormal operation of the USB device. The present invention has simple structure and low cost, and can automatically test the communication between the host computer and the test device, and the present invention provides a simple and effective method for the online test of the USB port, which overcomes the disadvantages of high cost in previous test methods, The hardware is more reliable, and the corresponding software is also simpler.

The details of the present invention will be described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is the flowchart of USB port testing method of the present invention; And

Fig. 2 is a structural diagram of the USB port testing device of the present invention.

Detailed ways

The present invention uses a preferred embodiment to illustrate the specific feasibility of the device and method proposed by the present invention. Please refer to FIG. 1 , which is a flow chart of the USB port testing method provided by the present invention. At first in step 100, the USB device driver is loaded by the computer; then in step 110, the USB device is searched, and its number is determined; then in step 120, the device configuration information is read in turn; in step 130, according to the read result, the USB port is judged work situation. In the above method, the USB device refers to the test device provided by the present application, which is connected to the USB port of the computer.

There are four wires connected to the USB port, they are: VCC, GND, D+, D-, among them, VCC and GND are power wires; D+ and D- are twist paired signal wires, and the USB host controller There are D+Line Status bits and D-LineStatus bits in the Port Status/Control Register. These two bits reflect the state of the two signal lines D+ and D- on the USB port. When the signal line is connected to a high potential, the corresponding position in the register is 1, otherwise it is set to 0. According to the device and method for testing the USB port proposed by the present invention, the chip AN2136SC chip of ez-usb company is used in this embodiment. When carrying out the USB port test, at first execute the test system initialization, this process mainly includes detecting whether there is a USB host controller, and reading the base address (BaseAddress) of the I/O of the USB host controller, and loading the USB device driver. Next, search whether the test device exists, judge the number of the device, then read the configuration information of the test device in turn, after the reading is completed, determine whether the USB port is working normally, if the configuration information of the test device is read successfully, then the The USB port is working normally. If the reading of the configuration information of the test device fails, the USB port is damaged. Finally, the test results are displayed. After a series of test steps above, if no short-circuit information is displayed during the test, it means that the USB port connection is normal, and continue to test the next USB port connection.

As shown in FIG. 2, FIG. 2 is a structural diagram of the USB port testing device of the present invention. The USB port testing device provided by the present invention includes an interface circuit and a test circuit, the interface circuit is connected with the USB port of the host computer, the test circuit is connected with the interface circuit, and the test circuit is composed of a test chip 220 and its peripheral components. Wherein, the USB port of the host communicates with the test chip 220 in the test circuit through the interface circuit. Connect the USB port to the AN2136SC chip of the test circuit. That is to connect the signal on the USB port with the corresponding terminal on the AN2136SC chip. In practical applications, other types of chips with the same function can also be selected, and other electronic components (such as resistors, capacitors, etc.) in the figure are the standard external circuit connection methods provided by the chip.

The principle of the present invention is to design an auxiliary tool capable of testing the USB port of a computer, and judge whether the USB port is good or bad by whether the access operation of the auxiliary tool can be successful. The simple hardware circuit is used to test whether the USB port is good or bad, which avoids the complexity of the prior art test method, does not need to use the USB device, can greatly save costs, and also avoids errors in judgment caused by the abnormal operation of the USB device. The present invention has simple structure and low cost, and can automatically test the communication between the host computer and the test device, and the present invention provides a simple and effective method for the online test of the USB port, which overcomes the disadvantages of high cost in previous test methods, The hardware is more reliable, and the corresponding software is also simpler.

Although the present invention is disclosed above with the aforementioned preferred embodiments, it is not intended to limit the present invention. Equivalent transformations made by those skilled in the art without departing from the spirit and scope of the present invention all include Within the patent scope of the present invention.

Claims (5)

1. a USB port testing method, for testing the working condition of the USB port of the host, is characterized in that, comprises the steps: Load the USB device driver; Search for USB devices and determine their number; sequentially read the device configuration information; and According to the reading result, the working condition of the USB port is judged. 2. The USB port testing method according to claim 1, wherein if the device configuration information is read successfully, then the USB port works normally. 3. The USB port testing method according to claim 1, wherein if reading the device configuration information fails, the USB port is damaged. 4. a kind of USB port testing device, is used for testing the working situation of the USB port of host computer, is characterized in that, this USB port testing device comprises: an interface circuit connected to the USB port of the host; and A test circuit, connected to the interface circuit, consisting of a test chip and its peripheral components; Wherein, the USB port of the host communicates with the test chip in the test circuit through the interface circuit. 5. The USB port testing device according to claim 4, wherein the testing chip is an AN2136SC chip.

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