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library ieee;
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use ieee.std_logic_1164.all;
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library work;
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package Constants is
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constant number_of_rows : natural := 6;
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constant number_of_cols : natural := 12;
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constant scancode_width : natural := 8;
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constant max_keys_pressed : natural := 3;
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constant number_of_keys : natural := number_of_rows * number_of_cols;
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-- internal clock of 50 Mhz divided by 512 gives about 100 kHz, 1 clock-cycle is about 10 us
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-- 100 ticks is about 1 ms.
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constant debounce_count : natural := 100;
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subtype row is std_logic_vector(number_of_cols-1 downto 0);
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subtype col is std_logic_vector(number_of_rows-1 downto 0);
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--3 bits
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subtype col_number is natural range 0 to number_of_rows-1;
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--4 bits
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subtype row_number is natural range 0 to number_of_cols-1;
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--number of keys pressed
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subtype key_number is natural range 0 to max_keys_pressed ;
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subtype states is std_logic_vector(6 downto 0);
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--last bit is to differentiate between idle and storing_stage2
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--output-lines : strobe, sample, analyse, store, produce, release
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constant idle : states := "0000000";
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constant strobing : states := "1000000";
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constant sampling : states := "0100000";
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constant analysing : states := "0110000";
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constant storing : states := "0001000";
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constant storing_stage2 : states := "0000001";
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constant producenormal : states := "0000100";
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constant producerelease : states := "0000110";
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type keymap is array (number_of_rows-1 downto 0) of row;
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subtype scancode is std_logic_vector(scancode_width-1 downto 0);
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-- we need 4 bits to encode the columns and 3 bits for the rows, gives an address of 7 bits
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-- that makes 128 possibilities of which 70 are used
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type set1_scancodes_lut_type is array (0 to 93) of std_logic_vector(scancode_width-1 downto 0);
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constant set1_scancodes_lut : set1_scancodes_lut_type :=
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(0 => X"01", --esc
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1 => X"10", --q
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2 => X"1e", --a
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3 => X"2a", --lshi
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4 => X"33", --,<
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5 => X"1d", --ctrl
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8 => X"3b", --f1
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9 => X"11", --w
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10 => X"1f", --s
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11 => X"2c", --z
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12 => X"1c", --enter
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13 => X"38", --alt
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16 => X"3c", --f2
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17 => X"12", --e
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18 => X"20", --d
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19 => X"2d", --x
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20 => X"48", --up
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21 => X"39", --space
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24 => X"3d", --f3
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25 => X"13", --r
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26 => X"21", --f
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27 => X"2e", --c
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28 => X"50", --down
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32 => X"3e", --f4
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33 => X"14", --t
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34 => X"22", --g
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35 => X"2f", --v
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36 => X"4b", --left
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40 => X"3f", --f5
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41 => X"15", --y
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42 => X"23", --h
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43 => X"30", --b
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44 => X"4d", --right
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45 => X"39", --space
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48 => X"28", --'"
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49 => X"16", --u
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50 => X"24", --j
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51 => X"31", --n
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53 => X"0f", --tab
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56 => X"1a", --[{
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57 => X"17", --i
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58 => X"25", --k
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59 => X"32", --m
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60 => X"34", --.>
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61 => X"3a", --caps
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64 => X"1b", --]}
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65 => X"18", --o
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66 => X"26", --l
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67 => X"36", --rshi
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68 => X"0e", --backspace
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69 => X"27", --;:
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72 => X"0c", ---_
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73 => X"19", --p
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74 => X"08", --7&
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75 => X"05", --4$
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76 => X"52", --ins
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77 => X"02", --1!
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80 => X"0d", --=+
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81 => X"29", --`~
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82 => X"09", --8*
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83 => X"06", --5%
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84 => X"0b", --0)
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85 => X"03", --2@
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88 => X"2b", --\|
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89 => X"35", --/?
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90 => X"0a", --9(
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91 => X"07", --6^
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92 => X"53", --del
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93 => X"04", --3#
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others => X"00" --error
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);
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end Constants;
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