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Added autoincrement ability and updated top level schematic.

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id101010
2016-06-06 21:43:25 +02:00
parent 45b78fe93e
commit ff913a6544
5 changed files with 258 additions and 244 deletions
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44
lcd_driver.vhd
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@@ -53,7 +53,6 @@ entity lcd_driver is
data : in STD_LOGIC_VECTOR (7 downto 0); -- either one ascii char (8bit) or new cursor position (0-31)
new_character : in STD_LOGIC; -- a new character is available on the data bus
new_pos : in STD_LOGIC; -- a new cursor position is available on the data bus
auto_incr_cursor : in STD_LOGIC; -- the cursor should automatically be incremented after writing a new character
busy : out STD_LOGIC; -- 1 when sending stuff
lcd_db : out STD_LOGIC_VECTOR (7 downto 0); -- lcd databus
lcd_en : out STD_LOGIC; -- lcd enable
@@ -64,16 +63,17 @@ architecture Behavioral of lcd_driver is
-- type definitions
type display_state is (
INIT, -- initialization, wait for 40ms to pass
SEND_FS1, -- send the function set
SEND_FS2, -- send the function set
SEND_SD, -- send the display ON/OFF control
SEND_CD, -- send a clear
SEND_ES, -- send entry mode set
WAITING1, -- wait and toggle lcd_en
WAITING2, -- wait and toggle lcd_en
WAITING3, -- wait and toggle lcd_en
DONE); -- initialization done
INIT, -- initialization, wait for 40ms to pass
SEND_FS1, -- send the function set
SEND_FS2, -- send the function set
SEND_SD, -- send the display ON/OFF control
SEND_CD, -- send a clear
SEND_ES, -- send entry mode set
SEND_ADRESS, -- send a new adress
WAITING1, -- wait and toggle lcd_en
WAITING2, -- wait and toggle lcd_en
WAITING3, -- wait and toggle lcd_en
DONE); -- initialization done
-- signals
signal cur_state : display_state := INIT; -- cur_state register
@@ -208,6 +208,17 @@ begin
next_ret_state <= DONE;
next_ret_counter <= to_unsigned(PAUSE_COUNT,NBITS);
next_state <= WAITING1;
when SEND_ADRESS => -- entry set mode
next_lcd_db <= '1' & data(6 downto 0);
next_lcd_en <= '1';
next_lcd_rs <= '0';
next_counter <= (others => '0');
next_ret_state <= DONE;
next_ret_counter <= to_unsigned(PAUSE_COUNT,NBITS);
next_state <= WAITING1;
when DONE => -- initialization done
@@ -216,12 +227,19 @@ begin
next_lcd_rs <= '0';
if(new_character = '1') then -- send data
next_lcd_rs <= '1';
next_lcd_rs <= '1';
next_counter <= (others => '0');
next_ret_state <= DONE;
next_ret_counter <= to_unsigned(PAUSE_COUNT,NBITS);
next_state <= WAITING1;
next_lcd_db <= data;
next_lcd_db <= data;
elsif(new_pos = '1') then -- new address
next_lcd_rs <= '0';
next_counter <= (others => '0');
next_ret_state <= SEND_ADRESS;
next_ret_counter <= to_unsigned(PAUSE_COUNT,NBITS);
next_state <= WAITING1;
next_lcd_db <= "000001" & data(7) & '0';
end if;
when WAITING1 => -- wait with jump