X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=src%2Fpc_communication.vhd;h=321d0a36feb4627e4a41f50216909c8a6614341b;hb=6001db94b7d15e097001a3e4e8b4ea1eaee75bad;hp=3490ea14690d6232f932e93c4c3a07142b60a14b;hpb=35c9e56f01e3a9a43ac508b9dd5e69e24cc46ef7;p=hwmod.git

diff --git a/src/pc_communication.vhd b/src/pc_communication.vhd
index 3490ea1..321d0a3 100644
--- a/src/pc_communication.vhd
+++ b/src/pc_communication.vhd
@@ -30,19 +30,14 @@ entity pc_communication is
 end entity pc_communication;
 
 architecture beh of pc_communication is
-	signal push_history, push_history_next : std_logic;
-
 	signal spalte, spalte_next : integer range 1 to hspalte_max + 1;
 	signal zeile , zeile_next : integer range 1 to hzeile_max + 1;
-	signal spalte_up, spalte_up_next : std_logic;
 	signal get, get_next : std_logic;
 	signal new_i, new_i_next : std_logic;
 	signal tx_done_i, tx_done_i_next : std_logic;
-	signal d_done_i : std_logic;
+	signal tx_data_i, tx_data_i_next : std_logic_vector (7 downto 0);
 	signal s_done, s_done_next : std_logic;
 
-	signal char, char_next : hbyte;
-	signal char_en : std_logic;
 	type STATE_PC is (IDLE, FETCH, FORWARD, DONE);
 	signal state, state_next : STATE_PC ;
 
@@ -52,64 +47,60 @@ begin
 	d_zeile <= hzeile(std_logic_vector(to_unsigned(zeile,7)));
 	d_spalte <= hspalte(std_logic_vector(to_unsigned(spalte,7)));
 	d_get <= get;
-	char_next <= d_char;
 	tx_new <= new_i;
-	d_done_i <= d_done;
 	tx_done_i_next <= tx_done;
+	tx_data <= tx_data_i;
 
 	sync: process (sys_clk, sys_res_n)
 	begin
 		if sys_res_n = '0' then
 			state <= IDLE;
-			push_history <= '0';
 			spalte <= 1;
 			zeile <= 1;
 			get <= '0';
 			new_i <= '0';
-			tx_data <= "00000000";
-			spalte_up <= '0';
+			tx_data_i <= "00000000";
 			tx_done_i <= '0';
 			s_done <= '0';
 		elsif rising_edge(sys_clk) then
-			push_history <= push_history_next;
 			spalte <= spalte_next;
 			zeile <= zeile_next;
 			state <= state_next;
 			get <= get_next;
 			new_i <= new_i_next;
 			tx_done_i <= tx_done_i_next;
-			spalte_up <= spalte_up_next;
+			tx_data_i <= tx_data_i_next;
 			s_done <= s_done_next;
-			if (char_en = '1') then
-				char <= char_next;
-			end if;
 		end if;
 	end process sync;
 
-	async_push_history : process (rx_new, rx_data, btn_a)
-	begin
-		if rx_new = '1' then
-			if rx_data = X"41" then
-				push_history_next <= '1';
-			else
-				push_history_next <= '0';
-			end if;
-		elsif btn_a = '1' then
-				push_history_next <= '1';
-		else
-			push_history_next <= '0';
-		end if;
-	end process async_push_history;
-
-	output_pc : process (state, zeile, spalte, char, tx_done_i, spalte_up)
+	output_pc : process (state, zeile, spalte, tx_data_i, tx_done_i)
+	variable spalte_up : std_logic;
 	begin
 		get_next <= '0';
 		new_i_next <= '0';
 
-		spalte_up_next <= '0';
 		s_done_next <= '0';
 		spalte_next <= spalte;
 		zeile_next <= zeile;
+		tx_data_i_next <= tx_data_i;
+		spalte_up := '0';
+
+		case state is
+			when IDLE =>
+				null;
+			when FETCH =>
+				get_next <= '1';
+				tx_data_i_next <= d_char;
+			when FORWARD =>
+				new_i_next <= '1';
+				if (tx_done_i = '1') then
+					spalte_up := '1';
+				end if;
+
+			when DONE =>
+				null;
+		end case;
 
 		if spalte_up = '1' then
 			if spalte = hspalte_max  then
@@ -127,30 +118,14 @@ begin
 			end if;
 		end if;
 
-		case state is
-			when IDLE =>
-				null;
-			when FETCH =>
-				get_next <= '1';
-				char_en <= '1';
-			when FORWARD =>
-				char_en <= '0';
-				tx_data <= char;
-				new_i_next <= '1';
-				if (tx_done_i = '1') then
-					spalte_up_next <= '1';
-				end if;
-
-			when DONE =>
-				null;
-		end case;
 	end process output_pc;
 
-	next_state_pc : process (rx_new, btn_a, d_done, tx_done_i, s_done)
+	next_state_pc : process (state, rx_new, rx_data, btn_a, d_done, tx_done_i, s_done)
 	begin
+		state_next <= state;
 		case state is
 			when IDLE =>
-				if rx_new = '1' or btn_a = '1' then
+				if (rx_new = '1' and rx_data = x"0a" ) or btn_a = '1' then
 					state_next <= FETCH;
 				end if;
 			when FETCH =>