Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Altera_Forum
Honored Contributor I
775 Views

LCD DE2-115 Initialization poblem

Hello everyone!! I'm trying to initialize LCD in the DE2-115 board. I know that the LCD is based in HDD44780U and I have following the datasheet to initialize it but the LCD turns crazy.  

 

See my Initiazitaion code: 

 

LIBRARY ieee; USE ieee.std_logic_1164.ALL; ENTITY lcd IS PORT( clock_50 : IN STD_LOGIC; reset_n : IN STD_LOGIC; lcd_enable : IN STD_LOGIC; lcd_bus : IN STD_LOGIC_VECTOR(9 DOWNTO 0); -- DATOS Y CONTROL busy : OUT STD_LOGIC := '1'; -- LIBRE/OCUPADO lcd_rw, lcd_rs, lcd_en : OUT STD_LOGIC; --read/write, setup/data y ENABLE lcd_on: out std_logic:='1'; -- lcd_blon: out std_logic:='1'; lcd_data : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); -- DATOS HACIA LCD END lcd; ARCHITECTURE controller OF lcd IS TYPE CONTROL IS(power_up, initialize, ready, send); SIGNAL state : CONTROL; CONSTANT freq : INTEGER := 50; -- 50 Mhz BEGIN PROCESS(clock_50) VARIABLE clk_count : INTEGER := 0; --Contador de timming BEGIN IF(clock_50'EVENT and clock_50 = '1') THEN CASE state IS -- Espera de 50 ms para inicilización de Vcc WHEN power_up => busy <= '1'; IF(clk_count < (50000 * freq)) THEN --espera de 50 ms clk_count := clk_count + 1; state <= power_up; ELSE --power-up completado clk_count := 0; lcd_rs <= '0'; lcd_rw <= '0'; lcd_data <= "00110000"; state <= initialize; END IF; -- Inicialización de LCD WHEN initialize => busy <= '1'; clk_count := clk_count + 1; IF(clk_count < (40 * freq)) THEN -- espera de 10us lcd_data <= "00111100"; --2-line mode, display on --lcd_data <= "00110100"; --1-line mode, display on --lcd_data <= "00110000"; --1-line mdoe, display off --lcd_data <= "00111000"; --2-line mode, display off lcd_en <= '1'; state <= initialize; -- ELSIF(clk_count < (50 * freq)) THEN --espera de 50 us -- lcd_data <= "00000000"; -- lcd_en <= '0'; -- state <= initialize; ELSIF(clk_count < (80 * freq)) and (clk_count > (40 * freq)) THEN --display on/off control -- lcd_data <= "00001100"; --display on, cursor off, parpadeo off -- lcd_data <= "00001101"; --display on, cursor off, parpadeo on -- lcd_data <= "00001110"; --display on, cursor on, parpadeo off lcd_data <= "00001111"; --display on, cursor on, parpadeo on --lcd_data <= "00001000"; --display off, cursor off, parpadeo off --lcd_data <= "00001001"; --display off, cursor off, parpadeo on --lcd_data <= "00001010"; --display off, cursor on, parpadeo off --lcd_data <= "00001011"; --display off, cursor on, parpadeo on lcd_en <= '1'; state <= initialize; -- ELSIF(clk_count < (120 * freq)) THEN --espera 50 us -- lcd_data <= "00000000"; -- lcd_en <= '0'; -- state <= initialize; ELSIF (clk_count > (80 * freq)) and (clk_count < (1610 * freq)) THEN -- limpiado de pantalla lcd_data <= "00000001"; lcd_en <= '1'; state <= initialize; -- ELSIF(clk_count < (1620 * freq)) THEN --espera 2 ms -- lcd_data <= "00000000"; -- lcd_en <= '0'; -- state <= initialize; ELSIF(clk_count < (1650 * freq)) and (clk_count > (1610 * freq)) THEN --entry mode set // espera 10 us lcd_data <= "00000110"; --increment mode, entire shift off --lcd_data <= "00000111"; --increment mode, entire shift on --lcd_data <= "00000100"; --decrement mode, entire shift off --lcd_data <= "00000101"; --decrement mode, entire shift on lcd_en <= '1'; state <= initialize; ELSIF(clk_count < (2200 * freq)) THEN --wait 60 us lcd_data <= "00000000"; lcd_en <= '0'; state <= initialize; ELSE --inicialización completada clk_count := 0; busy <= '0'; state <= ready; END IF; -- Espera al enable para el correcto envio de datos WHEN ready => IF(lcd_enable = '1') THEN busy <= '1'; lcd_rs <= lcd_bus(9); lcd_rw <= lcd_bus(8); lcd_data <= lcd_bus(7 DOWNTO 0); clk_count := 0; state <= send; ELSE busy <= '0'; lcd_rs <= '0'; lcd_rw <= '0'; lcd_data <= "00000000"; clk_count := 0; state <= ready; END IF; --send instruction to lcd WHEN send => busy <= '1'; IF(clk_count < (35 * freq)) THEN --do not exit for 50us busy <= '1'; IF(clk_count < 3*freq) THEN --negative enable lcd_en <= '0'; ELSIF(clk_count < (8 * freq)) THEN --positive enable half-cycle lcd_en <= '1'; ELSIF(clk_count < (34* freq)) THEN --negative enable half-cycle lcd_en <= '0'; END IF; clk_count := clk_count + 1; state <= send; ELSE clk_count := 0; state <= ready; END IF; END CASE; --reset IF(reset_n = '0') THEN state <= power_up; END IF; END IF; END PROCESS; END controller;  

 

 

 

And see my example to print in the lcd: 

 

LIBRARY ieee; USE ieee.std_logic_1164.all; ENTITY lcd_example IS PORT( clock_50 : IN STD_LOGIC; lcd_rw, lcd_rs, lcd_en : OUT STD_LOGIC; lcd_on: out std_logic:='1'; -- lcd_blon: out std_logic:='1'; lcd_data : OUT STD_LOGIC_VECTOR(7 DOWNTO 0) &nbsp;); END lcd_example; ARCHITECTURE behavior OF lcd_example IS SIGNAL lcd_enable : STD_LOGIC; SIGNAL lcd_bus : STD_LOGIC_VECTOR(9 DOWNTO 0); SIGNAL lcd_busy : STD_LOGIC; COMPONENT lcd IS PORT( clock_50 : IN STD_LOGIC; reset_n : IN STD_LOGIC; lcd_enable : IN STD_LOGIC; lcd_bus : IN STD_LOGIC_VECTOR(9 DOWNTO 0); busy : OUT STD_LOGIC; lcd_rw, lcd_rs, lcd_en : OUT STD_LOGIC; lcd_on: out std_logic:='1'; lcd_blon: out std_logic:='1'; lcd_data : OUT STD_LOGIC_VECTOR(7 DOWNTO 0)); END COMPONENT; BEGIN --Instanciación dut: lcd PORT MAP(clock_50=> clock_50, reset_n => '1', lcd_enable => lcd_enable, lcd_bus => lcd_bus, busy => lcd_busy, lcd_rw => lcd_rw, lcd_rs => lcd_rs, lcd_en => lcd_en, lcd_on=>lcd_on, lcd_data => lcd_data); PROCESS(clock_50) VARIABLE char : INTEGER RANGE 0 TO 10 := 0; BEGIN IF(clock_50'EVENT AND clock_50 = '1') THEN IF(lcd_busy = '0' AND lcd_enable = '0') THEN lcd_enable <= '1'; IF(char < 10) THEN char := char + 1; END IF; CASE char IS WHEN 1 => lcd_bus <= "1000110001"; WHEN 2 => lcd_bus <= "1000110010"; WHEN 3 => lcd_bus <= "1000110011"; WHEN 4 => lcd_bus <= "1000110100"; WHEN 5 => lcd_bus <= "1000110101"; WHEN 6 => lcd_bus <= "1000110110"; WHEN 7 => lcd_bus <= "1000110111"; WHEN 8 => lcd_bus <= "1000111000"; WHEN 9 => lcd_bus <= "1000111001"; WHEN OTHERS => lcd_enable <= '0'; END CASE; ELSE lcd_enable <= '0'; END IF; END IF; END PROCESS; END behavior;  

 

 

 

 

 

is there anyone could help me? 

 

Thank you very much.
0 Kudos
0 Replies