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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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UM0290 数据表(PDF) 23 Page - STMicroelectronics |
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UM0290 数据表(HTML) 23 Page - STMicroelectronics |
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23 / 76 page  UM0290 Joystick mouse demo 23/76 2 Joystick mouse demo A USB mouse (Human Interface Device class) is a simple example of a complete USB application. The joystick mouse uses only one interrupt endpoint (endpoint 1 in the IN direction). After normal enumeration, the host requests the HID report descriptor of the mouse. This specific descriptor is presented (with standard descriptors) in the file usb_desc.c. To get the mouse pointer position the host requests four bytes of data using the pipe 1 (endpoint 1) with the following format: Figure 2. Joystick mouse data format The purpose of the mouse demo is to set the X and Y values according to the user actions with a joystick button. The function JoyState() (b) gets the user actions and returns the direction of the mouse pointer. The function Joystick_Send() (b) formats the data to send to the host and validates the data transaction phase. b. File HW_config.c XY |
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