add top_count solutions

1 files changed, 6 insertions, 2 deletions

diff --git a/src/pwm.vhd b/src/pwm.vhd
index b23a170..9274bb9 100644
--- a/src/pwm.vhd
+++ b/src/pwm.vhd
@@ -11,7 +11,11 @@ entity pwm is
 end entity;
 
 architecture rtl of pwm is
+  signal cnt, ncnt : unsigned(3 downto 0);
 begin
-
-end architecture rtl; 
+  cnt <= "0000" when rst_n = '0' else ncnt when rising_edge(clk);
+  ncnt <= to_unsigned(0,cnt'length) when cnt = 14 else
+          cnt + 1;
+pwm_o <= '1' when cnt < unsigned(ctrl_i) else '0';
+end architecture rtl;