vga_time_generator.v

利用此源碼可以使用ALTERA DE2開發板將鍵盤變成一部電子琴

module vga_time_generator(

input       pixel_clk,

input [11:0]h_disp,
input [11:0]h_fporch,
input [11:0]h_sync,   
input [11:0]h_bporch,

input [11:0]v_disp,
input [11:0]v_fporch,
input [11:0]v_sync,   
input [11:0]v_bporch,

output     vga_hs,
output     vga_vs,
output     vga_blank,
output  reg[11:0]CounterY,
output  reg[11:0]CounterX

);

///////h sync////////
//h total sum//
wire [11:0]h_total=h_disp+h_fporch+h_sync+h_bporch-2;	
//h counter gen //
reg [11:0]h_counter;
reg VGA_HS_o;
reg VGA_BLANK_HS_o;
always @(posedge pixel_clk)begin
if (h_counter>(h_total-1)) h_counter=0;
else h_counter=h_counter+1;
end
//h timing generator// 
always @(posedge pixel_clk)begin
case(h_counter)
                        0:{VGA_BLANK_HS_o,VGA_HS_o}=2'b01;
                 h_fporch:{VGA_BLANK_HS_o,VGA_HS_o}=2'b00;
          h_fporch+h_sync:{VGA_BLANK_HS_o,VGA_HS_o}=2'b01;
 h_fporch+h_sync+h_bporch:{VGA_BLANK_HS_o,VGA_HS_o}=2'b11;
endcase
end

/////v sync///// 
//v total sum//
wire [11:0]v_total=v_disp+v_fporch+v_sync+v_bporch-2;
//v counter gen
reg [11:0]v_counter;
reg VGA_VS_o;
reg VGA_BLANK_VS_o;
always @(posedge vga_hs)begin
if (v_counter>(v_total-1)) v_counter=0;//805
else v_counter=v_counter+1;
end
//v timing generator// 
always @(posedge vga_hs)begin
case(v_counter)
                        0:{VGA_BLANK_VS_o,VGA_VS_o}=2'b01;
                 v_fporch:{VGA_BLANK_VS_o,VGA_VS_o}=2'b00;
          v_fporch+v_sync:{VGA_BLANK_VS_o,VGA_VS_o}=2'b01;
 v_fporch+v_sync+v_bporch:{VGA_BLANK_VS_o,VGA_VS_o}=2'b11;
endcase
end

//sync timing output//
assign vga_hs=VGA_HS_o;
assign vga_vs=VGA_VS_o;
assign vga_blank=VGA_BLANK_VS_o & VGA_BLANK_HS_o;

always @(posedge pixel_clk)begin
if(!VGA_BLANK_HS_o)CounterX=0;
else CounterX=CounterX+1;
end

always @(posedge vga_hs)begin
if(!VGA_BLANK_VS_o)CounterY=0;
else CounterY=CounterY+1;
end




endmodule