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7 Segment to BCD encoder
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const seg7_bcd = ([a, b, c, d, e, f, g]) => { | |
const w = (a & b & f & g) | (!b & !c & e) | (!a & e); | |
const x = (!a & b & g) | (a & !f & !g) | (a & !b); | |
const y = (!b & e & g) | (!d & e) | (a & !f); | |
const z = (!c & !d & g) | (c & !f) | (a & !e) | (!a & e); | |
return [w, x, y, z]; | |
}; | |
const TRUTH_TABLE = [ | |
["0000000", "0000", " "], | |
["1111110", "0000", "0"], | |
["0110000", "0001", "1"], | |
["1101101", "0010", "2"], | |
["1111001", "0011", "3"], | |
["0110011", "0100", "4"], | |
["1011011", "0101", "5"], | |
["1011111", "0110", "6"], | |
["1110000", "0111", "7"], | |
["1111111", "1000", "8"], | |
["1110011", "1001", "9"], | |
["1110111", "1010", "A"], | |
["0011111", "1011", "b"], | |
["1001110", "1100", "C"], | |
["0111101", "1101", "d"], | |
["1001111", "1110", "E"], | |
["1000111", "1111", "F"], | |
] | |
.map(([i, o, l]) => [i, o, l]) | |
.map(([[a, b, c, d, e, f, g], [w, x, y, z], l]) => [ | |
...[a, b, c, d, e, f, g, w, x, y, z].map(Number), | |
l, | |
]) | |
.map(([a, b, c, d, e, f, g, w, x, y, z, l]) => ({ | |
i: { a, b, c, d, e, f, g }, | |
o: { w, x, y, z }, | |
l, | |
})); | |
for (const { i, o, l } of TRUTH_TABLE) { | |
const result = seg7_bcd(Object.values(i)); | |
const comparison = result.every((v, i) => v === o[["w", "x", "y", "z"][i]]); | |
console.log( | |
`${comparison ? "✅" : "❌"} Letter ${l}: Input ${Object.values( | |
i | |
)} expected ${Object.values(o)} got ${result}` | |
); | |
} |
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LIBRARY ieee; | |
USE ieee.std_logic_1164.all; | |
ENTITY n7seg_bcd IS | |
PORT ( | |
A, B, C, D, E, F, G : IN STD_LOGIC; | |
W, X, Y, Z : OUT STD_LOGIC | |
); | |
END n7seg_bcd; | |
ARCHITECTURE Behavioral OF n7seg_bcd IS | |
BEGIN | |
PROCESS (A, B, C, D, E, F, G) | |
BEGIN | |
-- W is set for letterss 1, 3, 5, 7, 9, B, D, F | |
W <= A and B and F and G or | |
not(B) and not(C) and E or | |
not(A) and E; | |
-- X is set for letters 2, 3, 6, 7, A, B, E, F | |
X <= not(A) and B and G or | |
A and not(F) and not(G) or | |
A and not(B); | |
-- Y is set for letters 4, 5, 6, 7, C, D, E, F | |
Y <= not(B) and E and G or | |
not(D) and E or | |
A and not(F); | |
-- Z is set for letters 8, 9, A, B, C, D, E, F | |
Z <= C and not(F) or | |
not(C) and not(D) and not(G) or | |
A and not(E) or | |
not(A) and E or | |
A and not(E); | |
END PROCESS; | |
END Behavioral; |
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