HDMI色块移动——FPGA学习笔记13

一、方块移动原理

二、实验任务

使用FPGA开发板上的HDMI接口在显示器上显示一个不停移动的方块，要求方块移动到边界处时能够改变移动方向。显示分辨率为800*480，刷新速率为90hz。（480p分辨率为800*480，像素时钟频率Vga_clk = 800x480x90 = 33264000 ≈33.3Mhz（误差忽略不计））

三、程序设计

1、video_display框图:

`timescale 1ns / 1psmodule video_display(input               pixel_clk   ,//驱动时钟input               sys_rst_n   ,//复位信号   input       [10:0]  pixel_xpos  ,//像素点横坐标input       [10:0]  pixel_ypos  ,//像素点纵坐标output  reg [23:0]  pixel_data   //像素点数据);parameter   H_DISP  = 11'd800       ;           //分辨率   行
parameter   V_DISP  = 11'd480       ;           //分辨率   列
parameter   DIV_CNT = 22'd750000    ;           //分辨率计数器localparam  SIDE_W  = 11'd40        ;           //屏幕边框宽度
localparam  BLOCK_W = 11'd20        ;           //方块宽度
localparam  BLUE    = 24'h0000ff    ;           //屏幕边框颜色          蓝色
localparam  WHITE   = 24'hffffff    ;           //背景颜色              白色
localparam  BLACK   = 24'h000000    ;           //方块颜色              黑色reg     [10:0]  block_x = SIDE_W    ;           //方块左上角横坐标
reg     [10:0]  block_y = SIDE_W    ;           //方块左上角纵坐标
reg     [21:0]  div_cnt             ;           //时钟分频计数器
reg             h_direct            ;           //方块水平位移方向   1：右移    0：左移
reg             v_direct            ;           //方块竖直位移方向   1：向下    0：向上  wire            move_en             ;           //方块移动使能信号  频率100hzassign  move_en = (div_cnt == DIV_CNT - 1'd1) ? 1'd1 : 1'd0;//时钟计数器,实现时钟分频
always @(posedge pixel_clk or negedge sys_rst_n ) beginif (!sys_rst_n) begindiv_cnt <= 22'd0;    end else beginif (div_cnt < DIV_CNT - 1'd1) begin            div_cnt <= div_cnt + 1'd1;end else begindiv_cnt <= 22'd0;    //技术到10ms清零endend
end//当方块移动到边界时，改变移动方向always @(posedge pixel_clk or negedge sys_rst_n) beginif (!sys_rst_n) beginh_direct <= 1'b1;                       //方块初始水平向右移动v_direct <= 1'b1;                       //方块初始竖直向下移动end else beginif (block_x == SIDE_W + 1'b1) begin     //到达左边界，水平向右h_direct <= 1'b1;end else begin                              //到达有边界，水平向左  if(block_x == H_DISP - SIDE_W - BLOCK_W + 1'd1)beginh_direct <= 1'b0; endelse beginh_direct <= h_direct;endendif (block_y == SIDE_W + 1'b1) begin     //到达上边界，竖直向下v_direct <= 1'b1;end else begin                              //到达下边界，竖直向上if(block_y == V_DISP - SIDE_W - BLOCK_W + 1'b1)begin                          v_direct <= 1'b0;                           endelse beginv_direct <= v_direct;endend endend//根据方块移动方向，改变横纵坐标
always @(posedge pixel_clk or negedge sys_rst_n ) beginif (!sys_rst_n) begin block_x <= SIDE_W + 1'b1;               //方块初始位置横坐标block_y <= SIDE_W + 1'b1;               //方块初始位置纵坐标end else if(move_en == 1'b1)beginif (h_direct == 1'b1) beginblock_x <= block_x + 1'b1;          //方块向右移动end else beginblock_x <= block_x -1'b1;           //方块向左移动endif (v_direct == 1'b1) beginblock_y <= block_y + 1'b1;          //方块向下移动    end else beginblock_y <= block_y -1'b1;           //方块向上移动endendelse beginblock_x <= block_x;block_y <= block_y;end
end//对区域给出颜色数据
always @(posedge pixel_clk or negedge sys_rst_n ) beginif (!sys_rst_n) beginpixel_data <= BLACK;end else beginif ((pixel_xpos < SIDE_W) || (pixel_xpos >= H_DISP - SIDE_W) || (pixel_ypos <= SIDE_W) || (pixel_ypos > V_DISP - SIDE_W)) beginpixel_data <= BLUE;end else beginif ((pixel_xpos >= block_x -1'b1) && (pixel_xpos < block_x + BLOCK_W - 1'b1) && (pixel_ypos >= block_y) && (pixel_ypos < block_y + BLOCK_W - 1'b1)) beginpixel_data <= BLACK;end else beginpixel_data <= WHITE;endend    end
endendmodule

其他部分完全延用上一章代码

HDMI彩条显示——FPGA学习笔记12-CSDN博客