port (
sys_clk : in std_logic;
sys_res_n : in std_logic;
-
--button
btn_a : in std_logic;
-
--uart_tx
tx_data : out std_logic_vector(7 downto 0);
tx_new : out std_logic;
tx_done : in std_logic;
-
--uart_rx
rx_data : in std_logic_vector(7 downto 0);
rx_new : in std_logic;
-
-- History
pc_zeile : out hzeile;
pc_spalte : out hspalte;
signal zeile , zeile_next : integer range 0 to HZEILE_MAX + 1;
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);
- type STATE_PC is (IDLE, FETCH, FORWARD, WAIT_UART, UART_DONE, CR, CR_WAIT,
+ type STATE_PC is (IDLE, FETCH, FORWARD, UART_DONE, CR, CR_WAIT,
NL, NL_WAIT, PRINT_NO1, PRINT_NO1_WAIT, PRINT_NO2, PRINT_NO2_WAIT,
PRINT_NO3, PRINT_NO3_WAIT, PRINT_NO4, PRINT_NO4_WAIT, PRINT_NO5,
- PRINT_NO5_WAIT, PRINT_NO6, PRINT_NO0_WAIT);
+ PRINT_NO5_WAIT, PRINT_NO6);
signal state, state_next : STATE_PC ;
begin
pc_zeile <= hzeile(std_logic_vector(to_unsigned(zeile,7)));
pc_spalte <= hspalte(std_logic_vector(to_unsigned(spalte,7)));
pc_get <= get;
tx_new <= new_i;
- tx_done_i_next <= tx_done;
tx_data <= tx_data_i;
sync: process (sys_clk, sys_res_n)
get <= '0';
new_i <= '0';
tx_data_i <= x"00";
- tx_done_i <= '0';
elsif rising_edge(sys_clk) then
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;
end if;
end process sync;
- process (state, zeile, spalte, tx_data_i, tx_done_i, pc_char, rx_new, btn_a,
- pc_done)
+ process (state, zeile, spalte, tx_data_i, tx_done, pc_char, rx_new, btn_a,
+ pc_done, rx_data)
variable tmp : std_logic_vector(6 downto 0);
begin
get_next <= '0';
state_next <= state;
case state is
when IDLE =>
--- if (rx_new = '1' and rx_data = x"0a") or btn_a = '0' then
- if (rx_new = '1') or btn_a = '0' then
- state_next <= PRINT_NO0_WAIT;
- end if;
-
- when PRINT_NO0_WAIT =>
- if tx_done_i = '0' then
+ zeile_next <= 0;
+ spalte_next <= 1;
+ if ((rx_new = '1' and rx_data = x"41") or btn_a = '0') and tx_done = '0' then
state_next <= PRINT_NO1;
end if;
+
when PRINT_NO1 =>
tx_data_i_next <= x"28"; -- '('
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= PRINT_NO1_WAIT;
end if;
when PRINT_NO1_WAIT =>
- if tx_done_i = '0' then
+ if tx_done = '0' then
state_next <= PRINT_NO2;
end if;
when PRINT_NO2 =>
tx_data_i_next <= zeile2char(std_logic_vector(to_unsigned(zeile,7)), 1);
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= PRINT_NO2_WAIT;
end if;
when PRINT_NO2_WAIT =>
- if tx_done_i = '0' then
+ if tx_done = '0' then
state_next <= PRINT_NO3;
end if;
when PRINT_NO3 =>
tx_data_i_next <= zeile2char(std_logic_vector(to_unsigned(zeile,7)), 2);
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= PRINT_NO3_WAIT;
end if;
when PRINT_NO3_WAIT =>
- if tx_done_i = '0' then
+ if tx_done = '0' then
state_next <= PRINT_NO4;
end if;
when PRINT_NO4 =>
tx_data_i_next <= x"29"; -- ')'
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= PRINT_NO4_WAIT;
end if;
when PRINT_NO4_WAIT =>
- if tx_done_i = '0' then
+ if tx_done = '0' then
state_next <= PRINT_NO5;
end if;
when PRINT_NO5 =>
tx_data_i_next <= x"24"; -- '$'
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= PRINT_NO5_WAIT;
end if;
when PRINT_NO5_WAIT =>
- if tx_done_i = '0' then
+ if tx_done = '0' then
state_next <= PRINT_NO6;
end if;
when PRINT_NO6 =>
tx_data_i_next <= x"20"; -- ' '
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= FETCH;
end if;
when FETCH =>
get_next <= '1';
- if pc_done = '1' and tx_done_i = '0' then
+ if pc_done = '1' and tx_done = '0' then
state_next <= FORWARD;
if pc_char = x"00" then
state_next <= UART_DONE;
when FORWARD =>
tx_data_i_next <= pc_char;
new_i_next <= '1';
- -- halte pc_get weiterhin high sodass pc_char garantiert gleich bleibt
+ -- halte pc_get weiterhin high sodass pc_char garantiert
+ -- gleicht bleibt (blockiert history!)
get_next <= '1';
- state_next <= WAIT_UART;
- when WAIT_UART =>
- new_i_next <= '1';
- get_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= UART_DONE;
end if;
when UART_DONE =>
- state_next <= FETCH;
- spalte_next <= spalte + 1;
- if spalte = HSPALTE_MAX + 1 then
- state_next <= NL;
- spalte_next <= 1;
- zeile_next <= zeile + 1;
+ if tx_done = '0' then
+ state_next <= FETCH;
+ spalte_next <= spalte + 1;
+ if spalte = HSPALTE_MAX + 1 then
+ state_next <= NL;
+ spalte_next <= 1;
+ zeile_next <= zeile + 1;
+ end if;
end if;
when NL =>
tx_data_i_next <= x"0a";
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= NL_WAIT;
end if;
when NL_WAIT =>
- state_next <= CR;
+ if tx_done = '0' then
+ state_next <= CR;
+ end if;
when CR =>
tx_data_i_next <= x"0d";
new_i_next <= '1';
- if tx_done_i = '1' then
+ if tx_done = '1' then
state_next <= CR_WAIT;
end if;
when CR_WAIT =>
- tmp := std_logic_vector(to_unsigned(zeile,7));
- if tmp(0) = '0' then
- -- es handelt sich um eingabe
- -- => print zeilennummer
- state_next <= PRINT_NO0_WAIT;
- else
- state_next <= FETCH;
+ if tx_done = '0' then
+ tmp := std_logic_vector(to_unsigned(zeile,7));
+ if tmp(0) = '0' then
+ -- es handelt sich um eingabe im naechsten schritt
+ -- => print zeilennummer
+ state_next <= PRINT_NO1;
+ else
+ state_next <= FETCH;
+ end if;
end if;
if zeile = HZEILE_MAX then
state_next <= IDLE;
- zeile_next <= 0;
- spalte_next <= 1;
end if;
end case;
end process;
projects / hwmod.git / blobdiff