Integrate CAN controller and implement switches interrupt

soc/peripheral/peripherals.vhd

@@ -12,6 +12,22 @@ use work.config.all;
 
 package lt16soc_peripherals is
 
+    component can_vhdl_top is
+        generic(
+            memaddr	 : generic_addr_type;
+            addrmask : generic_mask_type
+        );
+        port(
+            clk	 : in std_logic;
+            rstn	 : in std_logic;
+            wbs_i	 : in wb_slv_in_type;
+            wbs_o	 : out wb_slv_out_type;
+            rx_i	 : in std_logic;
+            tx_o	 : out std_logic;
+            irq_on	 : out std_logic
+        );
+    end component can_vhdl_top;
+
 	component wb_led is
 	generic(
 		memaddr		:	generic_addr_type;-- := CFG_BADR_LED;
@@ -38,7 +54,9 @@ package lt16soc_peripherals is
 		wslvo	:	out	wb_slv_out_type;
 
         buttons : in std_logic_vector(4 downto 0);
-        switches : in std_logic_vector(15 downto 0)
+        switches : in std_logic_vector(15 downto 0);
+
+        interrupt : out std_logic
 	);
 	end component;
 

soc/peripheral/switches.vhd

@@ -19,7 +19,9 @@ entity wb_switches is
 		wslvo	:	out	wb_slv_out_type;
 
         buttons : in std_logic_vector(4 downto 0);
-        switches : in std_logic_vector(15 downto 0)
+        switches : in std_logic_vector(15 downto 0);
+
+        interrupt : out std_logic
 	);
 end wb_switches;
 
@@ -28,6 +30,8 @@ architecture Behavioral of wb_switches is
 	signal data : std_logic_vector(20 downto 0);
 	signal ack	: std_logic;
 
+    signal old_input : std_logic_vector(20 downto 0);
+
 begin
 
 	process(clk)
@@ -55,6 +59,26 @@ begin
 		end if;
 	end process;
 
+    process(clk)
+	begin
+		if clk'event and clk='1' then
+			if rst = '1' then
+                interrupt <= '0';
+                old_input <= (others => '0');
+            else
+                if buttons & switches /= old_input
+                then
+                    interrupt <= '1';
+                else
+                    interrupt <= '0';
+                end if;
+
+                old_input(15 downto 0) <= switches;
+                old_input(20 downto 16) <= buttons;
+            end if;
+        end if;
+    end process;
+
 	wslvo.dat(20 downto 0)	<= data;
 	wslvo.dat(31 downto 21)	<= (others=>'0');