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add fontset

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Nicholas Orlowsky 2024-01-31 14:50:26 -06:00
parent b4b1a91f9f
commit 6bd5af390f
1 changed files with 27 additions and 0 deletions
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yayacemu.sv
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@ -20,6 +20,8 @@ module yayacemu (
logic rom_ready;
logic [15:0] program_counter;
bit [7:0] fontset [79:0];
randomizer randy(clk_in, program_counter, keyboard, cycle_counter, rand_num);
keyboard kb(clk_in, keyboard);
rom_loader rl (memory, rom_ready);
@ -28,8 +30,29 @@ module yayacemu (
int i;
initial begin
fontset = {
8'hF0, 8'h90, 8'h90, 8'h90, 8'hF0, // 0
8'h20, 8'h60, 8'h20, 8'h20, 8'h70, // 1
8'hF0, 8'h10, 8'hF0, 8'h80, 8'hF0, // 2
8'hF0, 8'h10, 8'hF0, 8'h10, 8'hF0, // 3
8'h90, 8'h90, 8'hF0, 8'h10, 8'h10, // 4
8'hF0, 8'h80, 8'hF0, 8'h10, 8'hF0, // 5
8'hF0, 8'h80, 8'hF0, 8'h90, 8'hF0, // 6
8'hF0, 8'h10, 8'h20, 8'h40, 8'h40, // 7
8'hF0, 8'h90, 8'hF0, 8'h90, 8'hF0, // 8
8'hF0, 8'h90, 8'hF0, 8'h10, 8'hF0, // 9
8'hF0, 8'h90, 8'hF0, 8'h90, 8'h90, // A
8'hE0, 8'h90, 8'hE0, 8'h90, 8'hE0, // B
8'hF0, 8'h80, 8'h80, 8'h80, 8'hF0, // C
8'hE0, 8'h90, 8'h90, 8'h90, 8'hE0, // D
8'hF0, 8'h80, 8'hF0, 8'h80, 8'hF0, // E
8'hF0, 8'h80, 8'hF0, 8'h80, 8'h80 // F
};
watch_key = 255;
halt = 0;
for(i = 0; i < 80; i++) begin
memory[i] = fontset[i];
end
for(i = 0; i < 15; i++) begin
keyboard[i] = 0;
end
@ -310,6 +333,10 @@ module chip8_cpu(
$display("HW : INSTR ADD I, Vx");
index_reg = index_reg + {8'h00, registers[(opcode & 'h0F00) >> 8]};
end
'hF?29: begin
$display("HW : INSTR LDL F, Vx");
index_reg = registers[(opcode & 'h0F00) >> 8] * 5;
end
'hF?33: begin
$display("HW : INSTR LD B, Vx");
scratch = {8'h00, registers[(opcode & 'h0F00) >> 8]};