Altera Embedded Systems Development Kit, Cyclone III Edit Manuale Utente Scaricare il pdf (Pagina 64)

Altera Corporation Development Board Version 1.0.9–6

July 2010 Altera Embedded Systems Development Kit, Cyclone III Edition

Using the Nios II C2H Compiler

8. To change the color palette used in the final image simply press the

Color button followed by the Continue button. See Figure 9–4.

1 While the menu is being displayed, all rendering will be paused

as well. If you opened the menu and wish to continue without

changing any settings press the Continue button.

Whether the design is rendering data using hardware or software,

benchmark data is being collected and displayed to the screen.

■ When hardware rendering is selected the benchmark data is updated

at every 5 frames.

■ When software rendering is selected the benchmark data is updated

at every frame.

The benchmark data is displayed in the bottom right of the screen and it

represents the instantaneous frames per second being rendered and

displayed. Consider the implications of what you have observed: What

one would traditionally do with an expensive, power hungry GHz

processor was just accomplished using a Cyclone III FPGA, running at

100 MHz. Such is the power of hardware acceleration using FPGAs.

Operation

The design performs panning and zooming on the complex plane which

gives a video like effect. Every time a new frame is rendered, a new set of

coordinates must be calculated. These coordinates contain a center point,

zoom factor, and maximum number of iterations. Knowing the center

point and zoom factor the top left point of the screen is then determine

and passed to the Mandelbrot algorithm. The maximum number of

iterations is used to determine how much effort is spent per coordinate

before it is determined that the point is included in the Mandelbrot set

(these points appear as black pixels). The pixel calculation is based on the

following software segment:

inline int int_mandelbrot(long long cr, long long ci,

int max_iter)

{

long long xsqr=0, ysqr=0, x=0, y=0;

int iter=0;

// go ahead and shift these up to the new decimal

offset

ci = ci<<28;

cr = cr<<28;

while( ((xsqr + ysqr) < 0x0400000000000000LL) &&

(iter < max_iter) )

{

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Altera Embedded Systems Development Kit, Cyclone III Edit Manuale Utente Pagina 64

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Altera Embedded Systems Development Kit, Cyclone III Edit Manuale Utente Pagina 64

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