Altera DE2-115 Manual de usuario descargar pdf (Pagina 84)

VGA controller to perform the real-time image storage and display. Figure 6-3 shows the block

diagram of the circuit, which allows the user to draw lines on the VGA display screen using the

USB mouse. The VGA Controller block is integrated into the Altera Avalon bus so that it can be

controlled by the Nios II processor.

Once the program runs, the Nios II processor is started as it will detect the existence of the USB

mouse connected to DE2-115 board. When the mouse moves, the Nios II processor is able to keep

track of the movement and record it in a frame buffer memory. The VGA Controller will overlap the

data stored in the frame buffer with a default image pattern and display the overlapped image on the

VGA display.

Figure 6-3 Block diagram of the USB paintbrush demonstration

 Demonstration Setup, File Locations, and Instructions

Project directory: DE2_115_NIOS_HOST_MOUSE_VGA

Bit stream used: DE2_115_NIOS_HOST_MOUSE_VGA.sof

Nios II Workspace: DE2_115_NIOS_HOST_MOUSE_VGA\Software

• Connect a USB Mouse to the USB Host Connector (type A) of the DE2-115 board

• Connect the VGA output of the DE2-115 board to a VGA monitor (both LCD and CRT type of

monitors should work)

• Load the bit stream into FPGA(note*)

• Run the Nios II and choose DE2_115_NIOS_HOST_MOUSE_VGA\Software as the workspace.

Click on the Run button(note*)

• You should now be able to observe a blue background with an Altera logo on the VGA display

• Move the USB mouse and observe the corresponding movements of the cursor on the screen

• Left-click mouse to draw white dots/lines and right-click the mouse to erase white dots/lines on

the screen.

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Altera DE2-115 Manual de usuario Pagina 84