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TQ2440 and Linux-based touch-screen driven research

In Electronic Infomation Category: T | on April 19,2011

With the development of information search technology, because with a durable touch screen, fast response, space-saving, easy communication, etc., and BA6212 datasheet and has been widely used [1]. As a new touch screen computer input devices, is the most simple, convenient device of a human-computer interaction.

1 hardware profile

1.1 TQ2440 Development Board Introduction

Days produced TQ2440 embedded development board, microprocessors SamsungS3C2440AL, onboard 64 MB SDRAM, 256 MB Nand Flash, 2 MB Nor Flash, on-board 5-wire asynchronous serial port (UART0), 100 Mb/sDM9000 LAN, USB HOST interfaces, USB Device interface and BA6212 price and a SD card interface, integrated 4-wire resistive touch screen interface, and BA6212 suppliers and JTAG interface, audio interface uses a chip UDA1341, stereo audio output, recordable.

1.2 S3C2440 Processor

S3C2440 Samsung introduced by the 16/32 bit RISC microprocessors, the highest frequency of up to 533 MHz, type of handheld devices and general applications of low-cost, low-power, high-performance small-scale micro-controller solution. Integrated SDRAM controller inside the processor, LCD controller, 4-channel DMA, 3-channel UART, I2C bus, I2S bus, SD interfaces, PWMtimer, touch-screen interface, 8 channel 10 bit A / D controller and camera interface, very easy general development.

1.3 touch screen

Touch screen in accordance with the working principle and information transmission medium can be divided into four kinds, namely, resistive, infrared, capacitive sensors as well as surface acoustic wave. This design uses a 3.5-inch touchscreen East for 4-wire resistive touch screen. Specific parameters: Model: WXCAT35-TG3 # 001F; Size: 103 mm 83 mm; Display area: 70.08 mm (H) 52.56 mm (V); Display Colors: 16.7 million colors resolution; contrast ratio: 300:1; Brightness: 320 cd/m2; Power: 5 V voltage supply.

Resistive touch screen using pressure sensors to control the touch detection by the components and touch screen controller. Touch detection parts installed in front of the monitor screen, the user touches the location used for detection and location information to the touch the touch screen controller; touch screen controllers main role is from the touch point detection device to receive touch information and convert it into touch point coordinates, and then sent to CPU, it also can receive commands from the CPU and implemented. Body of the screen part of the touch screen with a display surface with the multi-layer composite film is by a layer of glass or plexiglass as a grass-roots level, the surface coated with a layer of transparent conductive layer of indium oxide (OTI), above the outer surface is then covered with a layer of hardened handling, smooth scratch-resistant plastic layer, and its inner surface is also coated with a layer of OTI, the two conductive layer between the many small (less than 1 / 1000) of the transparent insulating isolation points separate them. When the fingers touch screen, two conductive layers OTI will be a contact point, for which a conductive layer connected to the Y-axis direction of the 5 V voltage field uniform, making the detection of the voltage from zero to zero, the controller detect connected to this test data, the A / D conversion, and will be the voltage value compared with the 5 V, you can come and touch the Y-axis coordinates. Similarly, X-axis coordinates can be drawn.

S3C2440 touch touch-screen interface, including contacts and interrupt control logic, the logic of the ADC interface logic, you can control or select the contact for the touch screen XY coordinate conversion. Touch screen interface in order to complete the corresponding work, with 4 operating modes:

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