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标题: 基于fpga的vga图片显示（2） [打印本页]

作者: yuyang911220 时间: 2015-1-28 08:47 标题: 基于fpga的vga图片显示（2）

always @ (posedge clk or negedge rst_n)
begin
   if(!rst_n)
            y_cnt  <= 10'b0;
   else if(y_cnt == 10'd665)
            y_cnt  <=  10'b0;
   else if(x_cnt ==11'd1039 )
            y_cnt  <= y_cnt + 1'b1;
end

wire          valid;
assign       valid = (x_cnt >= 11'd187) && (x_cnt <= 11'd987) && (y_cnt >= 10'd31) && (y_cnt <= 10'd631);//---------------有效显示区坐标--------------------
wire [9:0] xpos;
wire [9:0] ypos;
assign       xpos =  x_cnt-11'd187;
assign       ypos =  y_cnt-10'd31;
//-------------------同步信号产生-------------------
reg hsync_r,vsync_r;
always @ (posedge clk or negedge rst_n)
begin
if(!rst_n)
         hsync_r <= 1'b1;
else if(x_cnt == 11'd0)
         hsync_r <= 1'b0;  //产生hsync信号
else if(x_cnt == 11'd120)
         hsync_r <= 1'b1;
end
always @ (posedge clk or negedge rst_n)
begin
  if(!rst_n)
         vsync_r <= 1'b1;
  else if(y_cnt == 10'd0)
         vsync_r <= 1'b0; //产生vsync信号
  else if(y_cnt == 10'd6)
         vsync_r <= 1'b1;
end
assign       hsync  = hsync_r;
assign       vsync  = vsync_r;
//-----------------显示图像-----------------------

always @ (posedge clk )
begin
  if((ypos >= 9'd100 && ypos <= 9'd255)&&(xpos >= 10'd65 && xpos <= 10'd244))
      addr <= (ypos-100)*180 + (xpos-65);
  else addr<=0;

end

endmodule

图片文件mif：
-- Copyright (C) 2006 Laputa Develop Group
-- PicToMif is a freeware, which can be spread freely,
-- as long as not being used in commerce.
-- Memory Initialization File (.mif) generated by PicToMif can
-- be used in Quartus to initialize the roms or rams.
WIDTH=3;
DEPTH=28080;
ADDRESS_RADIX=UNS;
DATA_RADIX=BIN;
CONTENT BEGIN
0 : 000;
1 : 111;
2 : 111;
3 : 111;
4 : 111;
5 : 111;
6 : 111;
7 : 111;
8 : 111;
9 : 111;
10 : 111;
11 : 111;
12 : 111;
13 : 111;
14 : 111;

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