关键词: STM32, 红外触摸屏, HID 协议

Abstract:

The infrared screen performs plane coordinates positioning using the good infrared directional characteristics.It obtains the location of touch point by arranging several transmitter-receiver tubes around the screen and by collecting and processing the signals from the receiver tube.The system uses the STM32F103 Cortex-M3 core as the main controller to realize standard USB touch device via protocol of USB HID (Human Interface Device),without the need for manual installation of l the driver for touch screen input,as long as the diameter of touch pen is over 5 mm so as to block the infrared (such as a finger,brush,etc.) Operations like writing,scaling,and rotating can be completed by touch.Installation is simple by connecting the USB interface directly to a PC with good anti-interference ability.