tx_done : in std_logic;
--uart_rx
- rx_data : in std_logic_vector(7 downto 0); --not really required
+ rx_data : in std_logic_vector(7 downto 0);
rx_new : in std_logic;
-- History
end entity pc_communication;
architecture beh of pc_communication is
- signal push_history, push_history_next : std_logic;
-
- signal spalte, spalte_next : hspalte;
- signal zeile , zeile_next : hzeile;
+ 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 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;
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;
+ 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 <= "0000000";
- spalte_next <= "0000000";
- zeile <= "0000000";
- zeile_next <= "0000000";
- d_get <= '0';
- tx_new <= '0';
- tx_data <= "00000000";
+ spalte <= 1;
+ zeile <= 1;
+ get <= '0';
+ new_i <= '0';
+ tx_data_i <= "00000000";
+ spalte_up <= '0';
+ 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;
+ tx_data_i <= tx_data_i_next;
+ spalte_up <= spalte_up_next;
+ s_done <= s_done_next;
if (char_en = '1') then
- state <= state_next;
+ char <= char_next;
end if;
end if;
end process sync;
- process (spalte_up)
- variable spalte_tmp, zeile_tmp : integer;
- variable spalte2_tmp, zeile2_tmp : std_logic_vector(7 downto 0);
+ output_pc : process (state, zeile, spalte, char, tx_data_i, tx_done_i, spalte_up)
begin
- if (spalte_up = '1') then
- if (spalte > X"45") then
- spalte_next <= "0000000";
- zeile_tmp := to_integer(unsigned(zeile)) + 1;
- zeile2_tmp := std_logic_vector(to_unsigned(zeile_tmp,8));
- zeile_next <= hzeile(zeile2_tmp(6 downto 0));
+ 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;
+ char_en <= '0';
+
+ if spalte_up = '1' then
+ if spalte = hspalte_max then
+ if zeile = hzeile_max then
+ spalte_next <= 1;
+ zeile_next <= 1;
+ s_done_next <= '1';
+ else
+ spalte_next <= 1;
+ zeile_next <= zeile + 1;
+ end if;
else
- spalte_tmp := to_integer(unsigned(spalte)) + 1;
- spalte2_tmp := std_logic_vector(to_unsigned(spalte_tmp,8));
- spalte_next <= hspalte(spalte2_tmp(6 downto 0));
-
+ spalte_next <= spalte + 1; --overflow here!
zeile_next <= zeile;
end if;
- spalte_up <= '0';
- end if;
- end process;
-
- 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)
- begin
- d_get <= '0';
- spalte_next <= "0000000";
- zeile_next <= "0000000";
- case state is
+ case state is
when IDLE =>
null;
when FETCH =>
- d_zeile <= zeile_next;
- d_spalte <= spalte_next;
- d_get <= '1';
+ get_next <= '1';
char_en <= '1';
- -- wait for timer overflow
- -- increment counter
when FORWARD =>
- char_en <= '0';
- tx_data <= char;
- tx_new <= '1';
+ tx_data_i_next <= char;
+ new_i_next <= '1';
+ if (tx_done_i = '1') then
+ spalte_up_next <= '1';
+ end if;
+
when DONE =>
null;
- -- be there for a single cycle and then
end case;
end process output_pc;
- next_state_pc : process (rx_new, btn_a, d_done, tx_done)
+ next_state_pc : process (state, rx_new, rx_data, btn_a, d_done, tx_done_i, s_done)
begin
- spalte_up <= '0';
+ 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;
- char <= d_char; --latch
end if;
when FETCH =>
if (d_done = '1') then
state_next <= FORWARD;
+ elsif (s_done = '1') then
+ state_next <= IDLE;
end if;
when FORWARD =>
- if (tx_done = '1') then
+ if (tx_done_i = '1') then
state_next <= FETCH;
- spalte_up <= '1';
end if;
when DONE =>
- -- be there for a single cycle and then
state_next <= IDLE;
end case;
end process next_state_pc;
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