nam/iceFun_Projects
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

led walker

Browse Source
This commit is contained in:
Nam Tran
2020-10-23 15:50:04 -05:00
parent 66010c90d9
commit e284e518ed
2 changed files with 37 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
fsm/rtl/top.v
View File

@@ -16,6 +16,7 @@ module top(i_clk, o_led, lcol1);
reg [WIDTH-1:0] counter;
reg [7:0] obuf; // output buffer, take into account the icefun use active low LED
reg [3:0] led_index;
reg strobe;
initial begin
@@ -26,11 +27,43 @@ module top(i_clk, o_led, lcol1);
always @(posedge clk_12MHz)
{strobe, counter} <= counter + 1'b1;
// fsm
always @(posedge clk_12MHz) begin
if (strobe) // led_index change only when strobe is 1
if (led_index >= 4'hd)
led_index <= 0;
else
led_index <= led_index + 1'b1;
case (led_index)
4'h0: obuf <= 8'h01;
4'h1: obuf <= 8'h02;
4'h2: obuf <= 8'h04;
4'h3: obuf <= 8'h08;
4'h4: obuf <= 8'h10;
4'h5: obuf <= 8'h20;
4'h6: obuf <= 8'h40;
4'h7: obuf <= 8'h80;
4'h8: obuf <= 8'h40;
4'h9: obuf <= 8'h20;
4'ha: obuf <= 8'h10;
4'hb: obuf <= 8'h08;
4'hc: obuf <= 8'h04;
4'hd: obuf <= 8'h02;
default : begin
obuf <= 8'h01;
end
endcase
end
/* shift reg
// shifting bit
always @(posedge clk_12MHz)
if (strobe)
obuf <= {obuf[6:0], obuf[7]}; // left shift
// obuf <= {obuf[0], obuf[7:1]}; // right shift
*/
always @(posedge clk_12MHz)
o_led <= ~obuf;