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Fixed controller lcd output by adding edge detection on lcd_busy. added testbench for controller.

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This commit is contained in:
T-moe
2016-06-06 20:44:55 +02:00
parent 382de8e524
commit 45b78fe93e
2 changed files with 129 additions and 4 deletions
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15
controller.vhd
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@@ -56,8 +56,12 @@ architecture Behavioral of controller is
signal lcd_newchar_reg,lcd_newchar_next : std_logic := '0';
signal lcd_data_reg, lcd_data_next: unsigned(7 downto 0) :=(others => '0');
type character_array is array (15 downto 0) of character;
constant line1 : character_array := ( 'h', 'e', 'l','l','o', others=> ' ' );
type character_array is array (0 to 15) of character;
constant line1 : character_array := ( 'h', 'e', 'l','l','o',' ', 'A', 'a', 'r', 'o', 'n', others=> ' ' );
-- for edge detection on lcd_busy
signal busy_old_reg, busy_old_next : std_logic := '0';
begin
@@ -71,6 +75,7 @@ begin
charcnt_reg <= (others => '0');
lcd_newchar_reg <= '0';
lcd_data_reg <= (others => '0');
busy_old_reg <= '0';
elsif(rising_edge(clk)) then
digpos_reg <= digpos_next;
@@ -80,6 +85,7 @@ begin
charcnt_reg <= charcnt_next;
lcd_newchar_reg<= lcd_newchar_next;
lcd_data_reg <= lcd_data_next;
busy_old_reg <= busy_old_next;
end if;
end process proc1;
@@ -103,7 +109,7 @@ begin
lcd_data <= lcd_data_reg;
lcd_newchar <= lcd_newchar_reg;
proc2: process(digit_reg,enc_updown,enc_ce,enc_err,enc_btn,digpos_reg,btn_old_reg, charcnt_reg, lcd_busy, lcd_data_reg, lcd_newchar_reg)
proc2: process(digit_reg,enc_updown,enc_ce,enc_err,enc_btn,digpos_reg,btn_old_reg, charcnt_reg, lcd_busy, lcd_data_reg, lcd_newchar_reg, busy_old_reg)
begin
digit_next <= digit_reg;
digpos_next <= digpos_reg;
@@ -112,6 +118,7 @@ begin
charcnt_next <= charcnt_reg;
lcd_newchar_next <= '0';
lcd_data_next <= lcd_data_reg;
busy_old_next <= lcd_busy;
if(enc_ce='1' and enc_err='0') then
if(enc_updown='1') then
@@ -127,7 +134,7 @@ begin
end if;
end if;
if(lcd_busy = '0' and charcnt_reg < 10) then
if(lcd_busy = '0' and busy_old_reg ='1' and charcnt_reg < 16) then
lcd_data_next <= to_unsigned(character'pos(line1(to_integer(charcnt_reg))),8);
lcd_newchar_next <= '1';
charcnt_next <= charcnt_reg + 1;