好消息，DE2又出新的IP了，支持Quartus II 9.0、9.1、10.0和10.1
大家可以Altera的官方网站下载，也可以和我联系，传给你一份QQ：287687752
下面是IP里面的一个实例，在<Quartus II安装目录>\University_Program\IP_Core_Demos\DE2\DE2_Video_SOPC_Builder_Demos中的DE2_VGA_Both_Buffers文件中
工程环境：Quartus II 10.1sp1 + NIOS II 10.1sp1 + DE2
打开上述文件的工程，我们直接进入SOPC Builder配置如下：
顶层工程文件更简单：
module DE2_VGA_Both_Buffers (
// Inputs
CLOCK_50,
KEY,
// Bidirectionals
// Memory (SRAM)
SRAM_DQ,
// Outputs
// Memory (SRAM)
SRAM_ADDR,
SRAM_CE_N,
SRAM_WE_N,
SRAM_OE_N,
SRAM_UB_N,
SRAM_LB_N,
// VGA
VGA_CLK,
VGA_HS,
VGA_VS,
VGA_BLANK,
VGA_SYNC,
VGA_R,
VGA_G,
VGA_B
);
/*****************************************************************************
* Parameter Declarations *
*****************************************************************************/
/*****************************************************************************
* Port Declarations *
*****************************************************************************/
// Inputs
input CLOCK_50;
input [3:0] KEY;
// Bidirectionals
// Memory (SRAM)
inout [15:0] SRAM_DQ;
// Outputs
// Memory (SRAM)
output [17:0] SRAM_ADDR;
output SRAM_CE_N;
output SRAM_WE_N;
output SRAM_OE_N;
output SRAM_UB_N;
output SRAM_LB_N;
// VGA
output VGA_CLK;
output VGA_HS;
output VGA_VS;
output VGA_BLANK;
output VGA_SYNC;
output [ 9: 0] VGA_R;
output [ 9: 0] VGA_G;
output [ 9: 0] VGA_B;
/*****************************************************************************
* Internal Wires and Registers Declarations *
*****************************************************************************/
// Internal Wires
// Internal Registers
// State Machine Registers
/*****************************************************************************
* Finite State Machine(s) *
*****************************************************************************/
/*****************************************************************************
* Sequential Logic *
*****************************************************************************/
/*****************************************************************************
* Combinational Logic *
*****************************************************************************/
/*****************************************************************************
* Internal Modules *
*****************************************************************************/
Video_System Char_Buffer_System (
// 1) global signals:
.clk_0 (CLOCK_50),
.reset_n (KEY[0]),
.sys_clk (),
.vga_clk (),
// the_Pixel_Buffer
.SRAM_DQ_to_and_from_the_Pixel_Buffer (SRAM_DQ),
.SRAM_ADDR_from_the_Pixel_Buffer (SRAM_ADDR),
.SRAM_LB_N_from_the_Pixel_Buffer (SRAM_LB_N),
.SRAM_UB_N_from_the_Pixel_Buffer (SRAM_UB_N),
.SRAM_CE_N_from_the_Pixel_Buffer (SRAM_CE_N),
.SRAM_OE_N_from_the_Pixel_Buffer (SRAM_OE_N),
.SRAM_WE_N_from_the_Pixel_Buffer (SRAM_WE_N),
// the_vga_controller
.VGA_CLK_from_the_VGA_Controller (VGA_CLK),
.VGA_HS_from_the_VGA_Controller (VGA_HS),
.VGA_VS_from_the_VGA_Controller (VGA_VS),
.VGA_BLANK_from_the_VGA_Controller (VGA_BLANK),
.VGA_SYNC_from_the_VGA_Controller (VGA_SYNC),
.VGA_R_from_the_VGA_Controller (VGA_R),
.VGA_G_from_the_VGA_Controller (VGA_G),
.VGA_B_from_the_VGA_Controller (VGA_B)
);
endmodule
看看RTL视图：
把编译好的配置文件下载DE2中，进入NIOS II
看看里面的给的C代码：
#include"system.h"
/* function prototypes */
void VGA_text (int, int, char *);
void VGA_box (int, int, int, int, short);
/********************************************************************************
* This program demonstrates use of the character and pixel buffers
*
* It performs the following:
* 1. Draws a blue box on the VGA display, and places a text string inside
* the box. Also, moves the word ALTERA around the display, "bouncing" off
* the blue box and screen edges
********************************************************************************/
int main(void)
{
/* Declare volatile pointer to pixel DMA controller (volatile means that IO load
and store instructions will be used to access these pointer locations,
instead of regular memory loads and stores) */
volatile int * Pixel_DMA_controller = (int *) PIXEL_BUFFER_DMA_BASE; // DMA controller base address
int delay = 0; // synchronize with the screen drawing
/* these variables are used for a blue box and a "bouncing" ALTERA on the VGA screen */
int ALT_x1; int ALT_x2; int ALT_y;
int ALT_inc_x; int ALT_inc_y;
int blue_x1; int blue_y1; int blue_x2; int blue_y2;
int screen_x; int screen_y; int char_buffer_x; int char_buffer_y;
short color;
/* create messages to be displayed on the VGA display */
char text_top_VGA[20] = "Altera DE2\0";
char text_bottom_VGA[20] = "Video Buffers\0";
char text_ALTERA[10] = "ALTERA\0";
char text_erase[10] = " \0";
/* the following variables give the size of the pixel buffer */
screen_x = 319; screen_y = 239;
color = 0x1863; // a dark grey color
VGA_box (0, 0, screen_x, screen_y, color); // fill the screen with grey
// draw a medium-blue box around the above text, based on the character buffer coordinates
blue_x1 = 28; blue_x2 = 52; blue_y1 = 26; blue_y2 = 34;
// character coords * 4 since characters are 4 x 4 pixel buffer coords (8 x 8 VGA coords)
color = 0x187F; // a medium blue color
VGA_box (blue_x1 * 4, blue_y1 * 4, blue_x2 * 4, blue_y2 * 4, color);
/* output text message in the middle of the VGA monitor */
VGA_text (blue_x1 + 5, blue_y1 + 3, text_top_VGA);
VGA_text (blue_x1 + 5, blue_y1 + 4, text_bottom_VGA);
char_buffer_x = 79; char_buffer_y = 59;
ALT_x1 = 0; ALT_x2 = 5/* ALTERA = 6 chars */; ALT_y = 0; ALT_inc_x = 1; ALT_inc_y = 1;
VGA_text (ALT_x1, ALT_y, text_ALTERA);
*(Pixel_DMA_controller) = 0; // dummy write to start buffer swap process
while (1)
{
if ( (*(Pixel_DMA_controller+3) & 1) == 0) // wait for Status register bit S == 0
{
/* If the screen has been drawn completely then we can draw a new image. This
* section of the code will only be entered each time the screen is redrawn */
delay = delay + 1;
if (delay == 2)
{
delay = 0;
/* The delay is inserted to slow down the animation */
/* move the ALTERA text around on the VGA screen */
VGA_text (ALT_x1, ALT_y, text_erase); // erase
ALT_x1 += ALT_inc_x;
ALT_x2 += ALT_inc_x;
ALT_y += ALT_inc_y;
if ( (ALT_y == char_buffer_y) || (ALT_y == 0) )
ALT_inc_y = -(ALT_inc_y);
if ( (ALT_x2 == char_buffer_x) || (ALT_x1 == 0) )
ALT_inc_x = -(ALT_inc_x);
if ( (ALT_y >= blue_y1 - 1) && (ALT_y <= blue_y2 + 1) )
{
if ( ((ALT_x1 >= blue_x1 - 1) && (ALT_x1 <= blue_x2 + 1)) ||
((ALT_x2 >= blue_x1 - 1) && (ALT_x2 <= blue_x2 + 1)) )
{
if ( (ALT_y == (blue_y1 - 1)) || (ALT_y == (blue_y2 + 1)) )
ALT_inc_y = -(ALT_inc_y);
else
ALT_inc_x = -(ALT_inc_x);
}
}
VGA_text (ALT_x1, ALT_y, text_ALTERA);
}
/* Execute a swap buffer command. This will allow us to check if the screen has
* been redrawn before generating a new animation frame. */
*(Pixel_DMA_controller) = 0;
}
}
}
/****************************************************************************************
* Subroutine to send a string of text to the VGA monitor
****************************************************************************************/
void VGA_text(int x, int y, char * text_ptr)
{
int offset;
volatile char * character_buffer = (char *) CHAR_BUFFER_WITH_DMA_AVALON_CHAR_BUFFER_SLAVE_BASE; // VGA character buffer
/* assume that the text string fits on one line */
offset = (y << 7) + x;
while ( *(text_ptr) )
{
*(character_buffer + offset) = *(text_ptr); // write to the character buffer
++text_ptr;
++offset;
}
}
/****************************************************************************************
* Draw a filled rectangle on the VGA monitor
****************************************************************************************/
void VGA_box(int x1, int y1, int x2, int y2, short pixel_color)
{
int offset, row, col;
volatile short * pixel_buffer = (short *) PIXEL_BUFFER_BASE; // VGA pixel buffer
/* assume that the box coordinates are valid */
for (row = y1; row <= y2; row++)
{
col = x1;
while (col <= x2)
{
offset = (row << 9) + col;
*(pixel_buffer + offset) = pixel_color; // compute halfword address, set pixel
++col;
}
}
}
接上显示器，我们就可以看到跳动的文字ALTERA了，还有蓝色的BOX，呵呵！
