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led walker

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Nam Tran
2020-10-23 15:50:04 -05:00
parent 66010c90d9
commit e284e518ed
2 changed files with 37 additions and 4 deletions
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33
fsm/rtl/top.v
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@@ -16,6 +16,7 @@ module top(i_clk, o_led, lcol1);
reg [WIDTH-1:0] counter; reg [WIDTH-1:0] counter;
reg [7:0] obuf; // output buffer, take into account the icefun use active low LED reg [7:0] obuf; // output buffer, take into account the icefun use active low LED
reg [3:0] led_index;
reg strobe; reg strobe;
initial begin initial begin
@@ -26,11 +27,43 @@ module top(i_clk, o_led, lcol1);
always @(posedge clk_12MHz) always @(posedge clk_12MHz)
{strobe, counter} <= counter + 1'b1; {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 // shifting bit
always @(posedge clk_12MHz) always @(posedge clk_12MHz)
if (strobe) if (strobe)
obuf <= {obuf[6:0], obuf[7]}; // left shift obuf <= {obuf[6:0], obuf[7]}; // left shift
// obuf <= {obuf[0], obuf[7:1]}; // right shift // obuf <= {obuf[0], obuf[7:1]}; // right shift
*/
always @(posedge clk_12MHz) always @(posedge clk_12MHz)
o_led <= ~obuf; o_led <= ~obuf;

8
fsm/sim/top.cc
View File

@@ -35,12 +35,12 @@ int main(int argc, char **argv) {
unsigned tickcount = 0; unsigned tickcount = 0;
int last_led = tb->o_led; int last_led = tb->o_led;
for(int k=0; k<(1 << 14); k++) { for(int k=0; k<(1 << 16); k++) {
tick(++tickcount, tb, tfp); tick(++tickcount, tb, tfp);
if (last_led != tb->o_led) { // if (last_led != tb->o_led) {
printf("k = %7d, led = %d\n", k, tb->o_led); // printf("k = %7d, led = %d\n", k, tb->o_led);
} // }
last_led = tb->o_led; last_led = tb->o_led;
} }