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Update AHBVGASYS.sv to SystemVerilog and style

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Aadi Desai 2022-11-07 13:57:19 +00:00
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207
rtl/AHB_VGA/AHBVGASYS.sv
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@ -3,7 +3,7 @@
// //
//Copyright (c) 2012, ARM All rights reserved. //
// //
//THIS END USER LICENCE AGREEMENT (“LICENCE”) IS A LEGAL AGREEMENT BETWEEN //
//THIS END USER LICENCE AGREEMENT (<EFBFBD>LICENCE<EFBFBD>) IS A LEGAL AGREEMENT BETWEEN //
//YOU AND ARM LIMITED ("ARM") FOR THE USE OF THE SOFTWARE EXAMPLE ACCOMPANYING //
//THIS LICENCE. ARM IS ONLY WILLING TO LICENSE THE SOFTWARE EXAMPLE TO YOU ON //
//CONDITION THAT YOU ACCEPT ALL OF THE TERMS IN THIS LICENCE. BY INSTALLING OR //
@ -34,154 +34,133 @@
// OF DOUBT, NO PATENT LICENSES ARE BEING LICENSED UNDER THIS LICENSE AGREEMENT.//
//////////////////////////////////////////////////////////////////////////////////
module AHBVGA(
input wire HCLK,
input wire HRESETn,
input wire [31:0] HADDR,
input wire [31:0] HWDATA,
input wire HREADY,
input wire HWRITE,
input wire [1:0] HTRANS,
input wire HSEL,
output wire [31:0] HRDATA,
output wire HREADYOUT,
output wire HSYNC,
output wire VSYNC,
output wire [7:0] RGB
module AHBVGA
( input wire HCLK
, input wire HRESETn
, input wire [31:0] HADDR
, input wire [31:0] HWDATA
, input wire HREADY
, input wire HWRITE
, input wire [1:0] HTRANS
, input wire HSEL
, output wire [31:0] HRDATA
, output wire HREADYOUT
, output wire HSYNC
, output wire VSYNC
, output wire [7:0] RGB
);
//Register locations
localparam IMAGEADDR = 4'hA;
localparam CONSOLEADDR = 4'h0;
//Internal AHB signals
reg last_HWRITE;
reg last_HSEL;
reg [1:0] last_HTRANS;
reg [31:0] last_HADDR;
wire [7:0] console_rgb; //console rgb signal
wire [7:0] console_rgb; //console rgb signal
wire [9:0] pixel_x; //current x pixel
wire [9:0] pixel_y; //current y pixel
reg console_write; //write to console
reg [7:0] console_wdata;//data to write to console
reg image_write; //write to image
reg [7:0] image_wdata; //data to write to image
wire [7:0] image_rgb; //image color
wire scroll; //scrolling signal
wire sel_console;
wire sel_console;
wire sel_image;
reg [7:0] cin;
always @(posedge HCLK)
if(HREADY)
begin
last_HADDR <= HADDR;
always_ff @(posedge HCLK)
if(HREADY) begin
last_HADDR <= HADDR;
last_HWRITE <= HWRITE;
last_HSEL <= HSEL;
last_HSEL <= HSEL;
last_HTRANS <= HTRANS;
end
//Give time for the screen to refresh before writing
assign HREADYOUT = ~scroll;
assign HREADYOUT = ~scroll;
//VGA interface: control the synchronization and color signals for a particular resolution
VGAInterface uVGAInterface (
.CLK(HCLK),
.COLOUR_IN(cin),
.cout(RGB),
.hs(HSYNC),
.vs(VSYNC),
.addrh(pixel_x),
.addrv(pixel_y)
);
VGAInterface uVGAInterface
( .CLK (HCLK)
, .COLOUR_IN (cin)
, .cout (RGB)
, .hs (HSYNC)
, .vs (VSYNC)
, .addrh (pixel_x)
, .addrv (pixel_y)
);
//VGA console module: output the pixels in the text region
vga_console uvga_console(
.clk(HCLK),
.resetn(HRESETn),
.pixel_x(pixel_x),
.pixel_y(pixel_y),
.text_rgb(console_rgb),
.font_we(console_write),
.font_data(console_wdata),
.scroll(scroll)
);
//VGA image buffer: output the pixels in the image region
vga_image uvga_image(
.clk(HCLK),
.resetn(HRESETn),
.address(last_HADDR[15:2]),
.pixel_x(pixel_x),
.pixel_y(pixel_y),
.image_we(image_write),
.image_data(image_wdata),
.image_rgb(image_rgb)
);
vga_console uvga_console
( .clk (HCLK)
, .resetn (HRESETn)
, .pixel_x (pixel_x)
, .pixel_y (pixel_y)
, .text_rgb (console_rgb)
, .font_we (console_write)
, .font_data (console_wdata)
, .scroll (scroll)
);
//VGA image buffer: output the pixels in the image region
vga_image uvga_image
( .clk (HCLK)
, .resetn (HRESETn)
, .address (last_HADDR[15:2])
, .pixel_x (pixel_x)
, .pixel_y (pixel_y)
, .image_we (image_write)
, .image_data (image_wdata)
, .image_rgb (image_rgb)
);
assign sel_console = (last_HADDR[23:0] == 12'h000000000000);
assign sel_image = (last_HADDR[23:0] != 12'h000000000000);
assign sel_console = (last_HADDR[23:0]== 12'h000000000000);
assign sel_image = (last_HADDR[23:0] != 12'h000000000000);
//Set console write and write data
always @(posedge HCLK, negedge HRESETn)
begin
if(!HRESETn)
begin
console_write <= 0;
console_wdata <= 0;
end
else if(last_HWRITE & last_HSEL & last_HTRANS[1] & HREADYOUT & sel_console)
begin
console_write <= 1'b1;
console_wdata <= HWDATA[7:0];
end
else
begin
console_write <= 1'b0;
console_wdata <= 0;
end
end
always_ff @(posedge HCLK, negedge HRESETn)
if(!HRESETn) begin
console_write <= 0;
console_wdata <= 0;
end else if (last_HWRITE & last_HSEL & last_HTRANS[1] & HREADYOUT & sel_console) begin
console_write <= 1'b1;
console_wdata <= HWDATA[7:0];
end else begin
console_write <= 1'b0;
console_wdata <= 0;
end
//Set image write and image write data
always @(posedge HCLK, negedge HRESETn)
begin
if(!HRESETn)
begin
image_write <= 0;
image_wdata <= 0;
end
else if(last_HWRITE & last_HSEL & last_HTRANS[1] & HREADYOUT & sel_image)
begin
image_write <= 1'b1;
image_wdata <= HWDATA[7:0];
end
else
begin
image_write <= 1'b0;
image_wdata <= 0;
end
end
always_ff @(posedge HCLK, negedge HRESETn)
if(!HRESETn) begin
image_write <= 0;
image_wdata <= 0;
end else if(last_HWRITE & last_HSEL & last_HTRANS[1] & HREADYOUT & sel_image) begin
image_write <= 1'b1;
image_wdata <= HWDATA[7:0];
end else begin
image_write <= 1'b0;
image_wdata <= 0;
end
//Select the rgb color for a particular region
always @*
begin
always_comb
if(!HRESETn)
cin <= 8'h00;
else
else
if(pixel_x[9:0]< 240 )
cin <= console_rgb ;
else
cin <= image_rgb;
end
endmodule