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Diffstat (limited to 'examples/icestick/leds/multi1.vhdl')
-rw-r--r-- | examples/icestick/leds/multi1.vhdl | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/examples/icestick/leds/multi1.vhdl b/examples/icestick/leds/multi1.vhdl new file mode 100644 index 0000000..a304765 --- /dev/null +++ b/examples/icestick/leds/multi1.vhdl @@ -0,0 +1,83 @@ +architecture multi1 of leds is + signal clk_4hz: std_logic; + signal clk_5sec : std_logic; + signal leds : std_ulogic_vector (1 to 5); +begin + (led1, led2, led3, led4, led5) <= leds; + + process (clk) + -- 3_000_000 is 0x2dc6c0 + variable counter : unsigned (23 downto 0); + begin + if rising_edge(clk) then + if counter = 2_999_999 then + counter := x"000000"; + clk_4hz <= '1'; + else + counter := counter + 1; + clk_4hz <= '0'; + end if; + end if; + end process; + + process (clk) + variable counter5 : unsigned (4 downto 0); + begin + if rising_edge (clk) then + clk_5sec <= '0'; + if clk_4hz = '1' then + if counter5 = 19 then + clk_5sec <= '1'; + counter5 := "00000"; + else + counter5 := counter5 + 1; + end if; + end if; + end if; + end process; + + process (clk) + variable count : unsigned (1 downto 0); + variable pat_count : unsigned (0 downto 0); + begin + if rising_edge(clk) then + if clk_4hz = '1' then + case pat_count is + when "0" => + case count is + when "00" => + leds <= "10001"; + when "01" => + leds <= "01000"; + when "10" => + leds <= "00101"; + when "11" => + leds <= "00010"; + when others => + null; + end case; + when "1" => + case count is + when "00" => + leds <= "10000"; + when "01" => + leds <= "01011"; + when "10" => + leds <= "00100"; + when "11" => + leds <= "01011"; + when others => + null; + end case; + when others => + null; + end case; + count := count + 1; + end if; + if clk_5sec = '1' then + pat_count := pat_count + 1; + count := "00"; + end if; + end if; + end process; +end multi1; |