P0071 Datasheet, PDF (20/43 Pages) Altera Corporation – DE2-115 with LCD Touch Panel and Camera

Figure 4-1 Application selector interface
Note: Please insert the supplied SD Card from this demonstration.
4.3 tPad Starter Demonstration
The tPad starter demonstration takes user the initial experience of an embedded system integrating a
LCD Touch Panel. This demonstration consists of two sub item, Touch and Color pattern generator.
The Touch segment draws a circle on where you touch the screen and updates its coordinates on the
top left corner. The pattern generator can be treated as an upgrade version of the LCD test program.
The software successively generates different color patterns after a fixed time delay. Users could
use it to quickly investigate any flaw of the LCD.
Figure 4-2 shows the hardware system block diagram of this demonstration. The system is clocked
by an external 50MHz Oscillator. Through the internal PLL module, the generated 100MHz clock is
used for Nios II processor and other components, and there also a 40MHz pixel clock for the video
pipeline and 10MHz for low-speed peripherals. The Nios II CPU runs the application software and
controls all the peripherals. A scatter-gather DMA is used to transfer pixel data from the video
buffer to the video pipeline.
19