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/**
* 译码器
*
* 0
* #######
* # # 1
* 5 # 6 #
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* # #
* 4 # # 2
* #######
* 3
*
* 0 表示 leds[0],若为 true 表示该 LED 显示,否则不显示
*
* @param num
* @return
*/
private boolean[] getLed(int num) {
boolean a = (num & 8) >>> 3 == 1;
boolean b = (num & 4) >>> 2 == 1;
boolean c = (num & 2) >>> 1 == 1;
boolean d = (num & 1) == 1;
boolean[] leds = new boolean[7];
leds[0] = a | (!a & c) |(!a & !b & !c & !d) | (!a & b & !c & d);
leds[1] = a | (!a & !b) | (!a & b & c & d) | (!a & b & !c & !d);
leds[2] = a | b | !c | d;
leds[3] = a | (!a & !b & c) | (!a & !b & !c & !d) | (!a & b & c & !d) |
(!a & b & !c & d);
leds[4] = (!a & c & !d) | (!b & !c & !d);
leds[5] = a | (!a & !b & !c & !d) | (!a & b & !d) | (!a & b & !c & d);
leds[6] = a | (!a & !b & c) | (!a & b & !c) | (!a & b & c & !d);
return leds;
}
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A, B, C, D 表示数字的各二进制位
a, b, c, d, e, f, g 表示 LED 的各段,为 1 时该段显示,为 0 时该段不显示
a
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# # b
f # g #
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d
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| | A | B | C | D | | a | b | c | d | e | f | g |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 0 | 0 | 0 | 0 | 0 | | 1 | 1 | 1 | 1 | 1 | 1 | 0 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 1 | 0 | 0 | 0 | 1 | | 0 | 1 | 1 | 0 | 0 | 0 | 0 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 2 | 0 | 0 | 1 | 0 | | 1 | 1 | 0 | 1 | 1 | 0 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 2 | 0 | 0 | 1 | 1 | | 1 | 1 | 1 | 1 | 0 | 0 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 4 | 0 | 1 | 0 | 0 | | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 5 | 0 | 1 | 0 | 1 | | 1 | 0 | 1 | 1 | 0 | 1 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 6 | 0 | 1 | 1 | 0 | | 1 | 0 | 1 | 1 | 1 | 1 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 7 | 0 | 1 | 1 | 1 | | 1 | 1 | 1 | 0 | 0 | 0 | 0 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 8 | 1 | 0 | 0 | 0 | | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+
| 9 | 1 | 0 | 0 | 1 | | 1 | 1 | 1 | 1 | 0 | 1 | 1 |
+---+---+---+---+---+ +---+---+---+---+---+---+---+