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jac-oblongjac-oblong
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simple character generator with character rom
1 parent 33ad4e9 commit ca109fe

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5 files changed

+333
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‎peripherals/jml-8-mini-vga/src/chargen.v‎

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module chargen (
2+
input clk,
3+
input [7:0] character,
4+
input [2:0] vertcount,
5+
output pixel
6+
);
7+
8+
reg [2:0] index = 0;
9+
wire [7:0] pixels;
10+
11+
assign pixel = pixels[index];
12+
13+
always @(posedge clk) index <= index + 1;
14+
15+
charmem #() character_rom (
16+
.clk(clk),
17+
.addr(character),
18+
.row(vertcount[2:0]),
19+
.pixels(pixels)
20+
);
21+
22+
endmodule

‎peripherals/jml-8-mini-vga/src/charmem.txt‎

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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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0E 0C 0C 0C 0C 0C 1E 00
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00 00 3B 66 66 3E 06 0F
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00 00 33 33 33 33 6E 00
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00 00 33 33 33 3E 30 1F
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00 00 3F 19 0C 26 3F 00
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38 0C 0C 07 0C 0C 38 00
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18 18 18 00 18 18 18 00
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07 0C 0C 38 0C 0C 07 00
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6E 3B 00 00 00 00 00 00
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00 00 00 00 00 00 00 00

‎peripherals/jml-8-mini-vga/src/charmem.v‎

Lines changed: 16 additions & 0 deletions
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1+
module charmem (
2+
input clk,
3+
input [7:0] addr,
4+
input [2:0] row,
5+
output reg [7:0] pixels
6+
);
7+
8+
reg [7:0] chars[255:0][7:0];
9+
10+
initial $readmemh("charmem.txt", chars, 0);
11+
12+
always @(posedge clk) begin
13+
pixels <= chars[addr][row];
14+
end
15+
16+
endmodule

‎peripherals/jml-8-mini-vga/src/signalgen.v‎

Lines changed: 14 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -4,22 +4,24 @@
44
module signalgen (
55
input clk,
66

7-
output vsync,
8-
output hsync
9-
);
7+
output vsync,
8+
output hsync,
9+
output visible,
10+
output reg [9:0] vertcount = 0,
11+
output reg [9:0] horicount = 0
1012

11-
reg [9:0] vertical_count = 0;
12-
reg [9:0] horizontal_count = 0;
13+
);
1314

14-
assign hsync = (horizontal_count < 656 || horizontal_count >= 752);
15-
assign vsync = (vertical_count < 490 || vertical_count >= 492);
15+
assign hsync = (horicount < 656 || horicount >= 752);
16+
assign vsync = (vertcount < 490 || vertcount >= 492);
17+
assign visible = (horicount < 640 && vertcount < 480);
1618

1719
always @(posedge clk) begin
18-
if (horizontal_count == 799) begin
19-
horizontal_count <= 0;
20-
if (vertical_count == 524) vertical_count <= 0;
21-
else vertical_count <= vertical_count + 1;
22-
end else horizontal_count <= horizontal_count + 1;
20+
if (horicount == 799) begin
21+
horicount <= 0;
22+
if (vertcount == 524) vertcount <= 0;
23+
else vertcount <= vertcount + 1;
24+
end else horicount <= horicount + 1;
2325
end
2426

2527
endmodule

‎peripherals/jml-8-mini-vga/src/toplevel.v‎

Lines changed: 25 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -9,33 +9,36 @@ module toplevel (
99
output lum
1010
);
1111

12-
reg [9:0] hori_counter = 0;
13-
reg [5:0] quart_counter = 0;
14-
reg [3:0] counter = 0;
12+
wire pixel;
13+
wire visible;
14+
reg [7:0] character = 65;
15+
wire [9:0] vertcount;
16+
wire [9:0] horicount;
1517

16-
always @(posedge clk) begin
17-
if (hori_counter == 799) begin
18-
hori_counter <= 0;
19-
quart_counter <= 0;
20-
counter <= 0;
21-
end else begin
22-
hori_counter <= hori_counter + 1;
23-
if (quart_counter == 39) begin
24-
quart_counter <= 0;
25-
counter <= counter + 1;
26-
end else quart_counter <= quart_counter + 1;
27-
end
28-
end
18+
assign red = pixel;
19+
assign green = pixel;
20+
assign blue = pixel;
21+
assign lum = pixel;
2922

30-
assign red = counter[0] ? counter[0] : 1'bZ;
31-
assign green = counter[1] ? counter[1] : 1'bZ;
32-
assign blue = counter[2] ? counter[2] : 1'bZ;
33-
assign lum = counter[3] ? counter[3] : 1'bZ;
23+
always @(posedge horicount[2]) begin
24+
if (character == 65) character <= 32;
25+
if (character == 32) character <= 65;
26+
end
3427

3528
signalgen #() signal_generator (
36-
.clk (clk),
29+
.clk(clk),
3730
.vsync(vsync),
38-
.hsync(hsync)
31+
.hsync(hsync),
32+
.visible(visible),
33+
.vertcount(vertcount),
34+
.horicount(horicount)
35+
);
36+
37+
chargen #() character_generator (
38+
.clk(clk),
39+
.character(character),
40+
.vertcount(vertcount[2:0]),
41+
.pixel(pixel)
3942
);
4043

4144
endmodule

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