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- added cursor position status port

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- 'dout' is set to last written character
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git-svn-id: http://moon:8086/svn/vhdl/trunk@603 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-11-04 19:29:50 +00:00
parent 7a4dff1301
commit 381e7cc659
1 changed files with 25 additions and 17 deletions
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lib/VGA_ctrl/src/char_gen.vhd
+25 -17
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@@ -54,16 +54,21 @@ entity char_gen is
-- Host Signals
clr_screen : in std_logic;
clr_line : in std_logic;
ascii_data : in unsigned(7 downto 0);
ascii_data_we : in std_logic;
ascii_posy_we : in std_logic;
ascii_posx_we : in std_logic;
din : in unsigned(7 downto 0);
dout : out unsigned(7 downto 0);
ascii_we : in std_logic;
posy_we : in std_logic;
posx_we : in std_logic;
ready : out std_logic;
-- Control signals
pos_x : in natural range 0 to tsvga.ts_h.ncyc_scan-1;
pos_y : in natural range 0 to tsvga.ts_v.ncyc_scan-1;
scan_pos_x_in : in natural range 0 to tsvga.ts_h.ncyc_scan-1;
scan_pos_y_in : in natural range 0 to tsvga.ts_v.ncyc_scan-1;
-- Status signals
csr_pos_x_out : out natural range 0 to MAX_CHAR_PER_LINE-1;
csr_pos_y_out : out natural range 0 to MAX_LINE_PER_FRAME-1;
-- Output
char_draw_en : out std_logic
@@ -198,6 +203,8 @@ begin
char_addr <= to_unsigned(csr_posx_reg, char_addr'length);
char_rom_addr <= a_data_rd & char_rom_row(NextExpBaseTwo(CHAR_SIZE_Y)-1 downto (CHARACTER_SCALE-1));
cursor_rom_addr <= cursor_visible & char_rom_row(NextExpBaseTwo(CHAR_SIZE_Y)-1 downto (CHARACTER_SCALE-1));
csr_pos_x_out <= csr_posx_reg;
csr_pos_y_out <= csr_posy_reg;
inst_char_rom : entity work.char_rom
PORT MAP
@@ -317,22 +324,23 @@ begin
csr_posx_cnt_set <= '0';
csr_posy_cnt_en <= '0';
csr_posy_cnt_set <= '0';
if ascii_posy_we = '1' then
csr_posy_cnt_din <= to_integer(ascii_data);
if posy_we = '1' then
csr_posy_cnt_din <= to_integer(din);
csr_posy_cnt_set <= '1';
elsif ascii_posx_we = '1' then
csr_posx_cnt_din <= to_integer(ascii_data);
elsif posx_we = '1' then
csr_posx_cnt_din <= to_integer(din);
csr_posx_cnt_set <= '1';
elsif ascii_data_we = '1' then
if ascii_data < X"20" then
if ascii_data = X"0D" then
elsif ascii_we = '1' then
dout <= din; -- written char is simply echoed back to dout
if din < X"20" then
if din = X"0D" then
csr_posx_cnt_din <= 0;
csr_posx_cnt_set <= '1';
elsif ascii_data = X"0A" then
elsif din = X"0A" then
csr_posy_cnt_en <= '1';
end if;
else
a_data_reg <= ascii_data - X"20";
a_data_reg <= din - X"20";
a_data_we <= '1';
csr_posx_cnt_en <= '1';
end if;
@@ -500,13 +508,13 @@ begin
char_draw_en <= char_en2 and char_reg(char_reg'left);
char_en2 := char_en;
char_en := '0';
if pos_y = SCREEN_OFFSET_Y then
if scan_pos_y_in = SCREEN_OFFSET_Y then
enable_y := '1';
cell_y_cnt <= 0;
char_x_cnt <= 0;
line_offset <= scroll_offset;
end if;
if pos_x = SCREEN_OFFSET_X and enable_y = '1' then
if scan_pos_x_in = SCREEN_OFFSET_X and enable_y = '1' then
enable_x := '1';
cell_x_cnt <= 0;
char_x_cnt <= 0;