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use 1 bit map for screen

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This commit is contained in:
Nicholas Orlowsky 2024-04-06 16:38:23 -05:00
parent f949c2515b
commit 9804af7796
Signed by: nickorlow
GPG key ID: 838827D8C4611687
9 changed files with 51 additions and 43 deletions
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23
cpu.sv
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@ -1,12 +1,12 @@
module cpu (
input wire rst_in,
input wire system_ready,
output bit [7:0] memory[0:4095],
input wire clk_in,
input wire keyboard[15:0],
input wire [7:0] random_number,
output int cycle_counter,
output wire [15:0] program_counter,
output wire [31:0] vram[0:2047],
output wire vram[0:2047],
output wire [7:0] sound_timer
);
@ -29,19 +29,11 @@ module cpu (
logic [31:0] x_cord;
logic [31:0] y_cord;
logic [7:0] size;
logic [31:0] screen_pixel;
logic screen_pixel;
logic [7:0] sprite_pixel;
always_ff @(posedge clk_in) begin
if (rst_in) begin
halt = 0;
watch_key = 255;
sound_timer = 0;
delay_timer = 0;
cycle_counter = 0;
program_counter = 'h200;
stack_pointer = 4'b0000;
end
always_ff @(negedge clk_in) begin
if (system_ready) begin
opcode = {memory[program_counter+0], memory[program_counter+1]};
$display("HW : opcode is 0x%h (%b)", opcode, opcode);
$display("HW : PC %0d 0x%h", program_counter, program_counter);
@ -199,10 +191,10 @@ module cpu (
sprite_pixel = memory[{16'h0000, index_reg}+r] & ('h80 >> c);
if (|sprite_pixel) begin
if (screen_pixel == 32'hFFFFFFFF) begin
if (screen_pixel == 1) begin
registers[15] = 1;
end
vram[((r+y_cord)*64)+(x_cord+c)] ^= 32'hFFFFFFFF;
vram[((r+y_cord)*64)+(x_cord+c)] ^= 1;
end
end
end
@ -294,5 +286,6 @@ module cpu (
if (!halt) program_counter += 2;
cycle_counter++;
end
end
endmodule