FPGA_工程_基于rom的vga显示

一 框图

二 代码修改

module Display
#(parameter H_DISP = 1280,parameter V_DISP = 1024,parameter H_lcd = 12'd150,parameter V_lcd = 12'd150,parameter LCD_SIZE = 15'd10_000
)
( input  wire	 		clk,	input  wire			rst_n,	input  wire	[11:0]	lcd_xpos,	//lcd horizontal coordinateinput  wire	[11:0]	lcd_ypos,	//lcd vertical coordinateoutput wire  [23:0]	lcd_data	//lcd data
);wire        [23:0] pic_data;
wire          lcd_valid;
reg         [14:0] rom_addra;
reg          [23:0] data_lcd;assign lcd_data = (lcd_valid == 1'b1) ?  pic_data : data_lcd;
assign lcd_valid = ((lcd_xpos >=(((H_DISP-H_lcd)/2))))&&((lcd_xpos >=(((H_DISP-H_lcd)/2)+H_lcd)))&&((lcd_ypos >=(((V_DISP-V_lcd)/2))))&&((lcd_ypos >=(((V_DISP-V_lcd)/2)+V_lcd)));   always@(posedge clk or negedge rst_n)if(rst_n==1'b0)rom_addra <= 15'd0;else  if(rom_addra == LCD_SIZE - 1'b1)rom_addra <= 15'd0;else  if(lcd_valid == 1'b1)rom_addra <= rom_addra+1'b1;`ifdef VGA_HORIZONTAL_COLOR
always@(posedge clk or negedge rst_n)
beginif(!rst_n)lcd_data <= 24'h0;elsebeginif	(lcd_ypos >= 0 && lcd_ypos < (V_DISP/8)*1)data_lcd <= `RED;else if(lcd_ypos >= (V_DISP/8)*1 && lcd_ypos < (V_DISP/8)*2)data_lcd <= `GREEN;else if(lcd_ypos >= (V_DISP/8)*2 && lcd_ypos < (V_DISP/8)*3)data_lcd <= `BLUE;else if(lcd_ypos >= (V_DISP/8)*3 && lcd_ypos < (V_DISP/8)*4)data_lcd <= `WHITE;else if(lcd_ypos >= (V_DISP/8)*4 && lcd_ypos < (V_DISP/8)*5)data_lcd <= `BLACK;else if(lcd_ypos >= (V_DISP/8)*5 && lcd_ypos < (V_DISP/8)*6)data_lcd <= `YELLOW;else if(lcd_ypos >= (V_DISP/8)*6 && lcd_ypos < (V_DISP/8)*7)data_lcd <= `CYAN;elsedata_lcd <= `ROYAL;end
end
`endif`ifdef VGA_VERTICAL_COLOR
always@(posedge clk or negedge rst_n)
beginif(!rst_n)lcd_data <= 24'h0;elsebeginif	(lcd_xpos >= 0 && lcd_xpos < (H_DISP/8)*1)data_lcd <= `RED;else if(lcd_xpos >= (H_DISP/8)*1 && lcd_xpos < (H_DISP/8)*2)data_lcd <= `GREEN;else if(lcd_xpos >= (H_DISP/8)*2 && lcd_xpos < (H_DISP/8)*3)data_lcd <= `BLUE;else if(lcd_xpos >= (H_DISP/8)*3 && lcd_xpos < (H_DISP/8)*4)data_lcd <= `WHITE;else if(lcd_xpos >= (H_DISP/8)*4 && lcd_xpos < (H_DISP/8)*5)data_lcd <= `BLACK;else if(lcd_xpos >= (H_DISP/8)*5 && lcd_xpos < (H_DISP/8)*6)data_lcd <= `YELLOW;else if(lcd_xpos >= (H_DISP/8)*6 && lcd_xpos < (H_DISP/8)*7)data_lcd <= `CYAN;elsedata_lcd <= `ROYAL;end
end
`endif`ifdef VGA_GRAFTAL_GRAPH
always@(posedge clk or negedge rst_n)
beginif(!rst_n)lcd_data <= 24'h0;elselcd_data <= lcd_xpos * lcd_ypos;
end
`endif`ifdef VGA_GRAY_GRAPH
always@(posedge clk or negedge rst_n)
beginif(!rst_n)lcd_data <= 24'h0;elsebeginif(lcd_ypos < V_DISP/2)lcd_data <= {lcd_ypos[7:0], lcd_ypos[7:0], lcd_ypos[7:0]};elselcd_data <= {lcd_xpos[7:0], lcd_xpos[7:0], lcd_xpos[7:0]};end
end
`endifvga_Demo_ip vga_inst (.addra(addra),.clka(clk),.doa(pic_data));endmodule

对工程中的数据生成模块进行了修改，例化了rom ip ，增添了逻辑语句，用于输出图像数据。