the designed circuit verification

Get device descriptor, device address assignment and configuration of equipment. Image of the point about USB host enumeration process is: first get the device properties, device 18 will return the value (the value of the firmware is the largest packet endpoint useful length), then assign the device an operating address, address range can be based on actual conditions may be, and configure the device, and finally enumerate the device endpoint, each endpoint access device number (address). Enumeration of the real purpose is to obtain the endpoint address of the device, is sufficient to complete the send and receive packets. Keil Keil software developed by the German chip compiler, is the best 51 MCU development tools, can be used to compile the C source code and compile source code, connect, and relocatable object files and library files, create a HEX file, debug target program, etc., is an integrated document management build environment. The body of laser pointer is firm in quality.
In Proteus, you can program directly with the Keil software FBI, thus achieving the designed circuit verification. Double-click the desktop shortcut icon as shown in Figure 6-7 to enter the editing interface integrated development environment, including three windows: the project window, edit window and output window. Click the Project menu, the pop-up drop-down menu, select "New Project" option, a new project, as shown in Figure 1: select the path you want to save, enter the project file name, then click "Save" button. The one who wants to do the resale of laser pointer should take the responsibility. Testing Report of  laser pointer, A pop-up dialog box, select the required microcontroller type. This chip can be used to select, Keil supports almost all 51-core chip, Atmel's 89C51 here to illustrate, as shown in Figure 2: First choose Atmel, and then click on the left of the "+" sign after the selection AT89C51 , right-hand column "Options" dialog box, select "Output" tab bar, as shown in Figure 3 according to one set of. In the menu bar, click "File" menu, and then in the drop-down menu, click "New" option, or just click the shortcut icon on the toolbar to create a new editor window. The customer has to observe the requirement and responsibility of resale of laser pointer . The cursor blinking in the edit window, then enter the user's application.