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-rw-r--r--src/pwm/pwm.v15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/pwm/pwm.v b/src/pwm/pwm.v
new file mode 100644
index 0000000..5d9e902
--- /dev/null
+++ b/src/pwm/pwm.v
@@ -0,0 +1,15 @@
+module pwm(
+ input wire clk,
+ output wire led
+);
+
+reg[23:0] cnt;
+always @(posedge clk) cnt = cnt + 1;
+
+wire[3:0] pwmin = cnt[23] ? cnt[23:19] : ~cnt[23:19];
+reg[4:0] pwm;
+
+always @(posedge clk) pwm <= pwm[3:0] + pwmin;
+
+assign led = pwm[4];
+endmodule