fpga/ws2812b-vhdl
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ws2812b-vhdl/design/ws2812b_gamma.vhd

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-- ----------------------------------------------------------------------------
-- WS2812B CONTROLLER FOR FPGAS
-- ----------------------------------------------------------------------------
-- ws2812b_gamma.vhd : Gamma correction RAM for the WS2812B LEDs.
-- : Do note that this generates a (fairly large, async) LUT.
-- ----------------------------------------------------------------------------
-- Author : Markus Koch <markus@notsyncing.net>
-- Contributors : None
-- Created on : 2016/10/16
-- License : Mozilla Public License (MPL) Version 2
-- ----------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity ws2812b_gamma is
port(
pixelData_in : in std_logic_vector(7 downto 0);
pixelData_out : out std_logic_vector(7 downto 0)
);
end entity ws2812b_gamma;
architecture RTL of ws2812b_gamma is
type gamma_table_t is array (0 to 255) of std_logic_vector(7 downto 0);
constant gamma_table : gamma_table_t := (
0 => std_logic_vector(to_unsigned(0, 8)),
1 => std_logic_vector(to_unsigned(0, 8)),
2 => std_logic_vector(to_unsigned(0, 8)),
3 => std_logic_vector(to_unsigned(0, 8)),
4 => std_logic_vector(to_unsigned(0, 8)),
5 => std_logic_vector(to_unsigned(0, 8)),
6 => std_logic_vector(to_unsigned(0, 8)),
7 => std_logic_vector(to_unsigned(0, 8)),
8 => std_logic_vector(to_unsigned(0, 8)),
9 => std_logic_vector(to_unsigned(0, 8)),
10 => std_logic_vector(to_unsigned(0, 8)),
11 => std_logic_vector(to_unsigned(0, 8)),
12 => std_logic_vector(to_unsigned(0, 8)),
13 => std_logic_vector(to_unsigned(0, 8)),
14 => std_logic_vector(to_unsigned(0, 8)),
15 => std_logic_vector(to_unsigned(0, 8)),
16 => std_logic_vector(to_unsigned(0, 8)),
17 => std_logic_vector(to_unsigned(0, 8)),
18 => std_logic_vector(to_unsigned(0, 8)),
19 => std_logic_vector(to_unsigned(0, 8)),
20 => std_logic_vector(to_unsigned(0, 8)),
21 => std_logic_vector(to_unsigned(0, 8)),
22 => std_logic_vector(to_unsigned(1, 8)),
23 => std_logic_vector(to_unsigned(1, 8)),
24 => std_logic_vector(to_unsigned(1, 8)),
25 => std_logic_vector(to_unsigned(1, 8)),
26 => std_logic_vector(to_unsigned(1, 8)),
27 => std_logic_vector(to_unsigned(1, 8)),
28 => std_logic_vector(to_unsigned(1, 8)),
29 => std_logic_vector(to_unsigned(2, 8)),
30 => std_logic_vector(to_unsigned(2, 8)),
31 => std_logic_vector(to_unsigned(2, 8)),
32 => std_logic_vector(to_unsigned(2, 8)),
33 => std_logic_vector(to_unsigned(2, 8)),
34 => std_logic_vector(to_unsigned(2, 8)),
35 => std_logic_vector(to_unsigned(3, 8)),
36 => std_logic_vector(to_unsigned(3, 8)),
37 => std_logic_vector(to_unsigned(3, 8)),
38 => std_logic_vector(to_unsigned(3, 8)),
39 => std_logic_vector(to_unsigned(3, 8)),
40 => std_logic_vector(to_unsigned(4, 8)),
41 => std_logic_vector(to_unsigned(4, 8)),
42 => std_logic_vector(to_unsigned(4, 8)),
43 => std_logic_vector(to_unsigned(4, 8)),
44 => std_logic_vector(to_unsigned(5, 8)),
45 => std_logic_vector(to_unsigned(5, 8)),
46 => std_logic_vector(to_unsigned(5, 8)),
47 => std_logic_vector(to_unsigned(5, 8)),
48 => std_logic_vector(to_unsigned(6, 8)),
49 => std_logic_vector(to_unsigned(6, 8)),
50 => std_logic_vector(to_unsigned(6, 8)),
51 => std_logic_vector(to_unsigned(7, 8)),
52 => std_logic_vector(to_unsigned(7, 8)),
53 => std_logic_vector(to_unsigned(7, 8)),
54 => std_logic_vector(to_unsigned(8, 8)),
55 => std_logic_vector(to_unsigned(8, 8)),
56 => std_logic_vector(to_unsigned(8, 8)),
57 => std_logic_vector(to_unsigned(9, 8)),
58 => std_logic_vector(to_unsigned(9, 8)),
59 => std_logic_vector(to_unsigned(9, 8)),
60 => std_logic_vector(to_unsigned(10, 8)),
61 => std_logic_vector(to_unsigned(10, 8)),
62 => std_logic_vector(to_unsigned(11, 8)),
63 => std_logic_vector(to_unsigned(11, 8)),
64 => std_logic_vector(to_unsigned(11, 8)),
65 => std_logic_vector(to_unsigned(12, 8)),
66 => std_logic_vector(to_unsigned(12, 8)),
67 => std_logic_vector(to_unsigned(13, 8)),
68 => std_logic_vector(to_unsigned(13, 8)),
69 => std_logic_vector(to_unsigned(13, 8)),
70 => std_logic_vector(to_unsigned(14, 8)),
71 => std_logic_vector(to_unsigned(14, 8)),
72 => std_logic_vector(to_unsigned(15, 8)),
73 => std_logic_vector(to_unsigned(15, 8)),
74 => std_logic_vector(to_unsigned(16, 8)),
75 => std_logic_vector(to_unsigned(16, 8)),
76 => std_logic_vector(to_unsigned(17, 8)),
77 => std_logic_vector(to_unsigned(17, 8)),
78 => std_logic_vector(to_unsigned(18, 8)),
79 => std_logic_vector(to_unsigned(18, 8)),
80 => std_logic_vector(to_unsigned(19, 8)),
81 => std_logic_vector(to_unsigned(19, 8)),
82 => std_logic_vector(to_unsigned(20, 8)),
83 => std_logic_vector(to_unsigned(21, 8)),
84 => std_logic_vector(to_unsigned(21, 8)),
85 => std_logic_vector(to_unsigned(22, 8)),
86 => std_logic_vector(to_unsigned(22, 8)),
87 => std_logic_vector(to_unsigned(23, 8)),
88 => std_logic_vector(to_unsigned(23, 8)),
89 => std_logic_vector(to_unsigned(24, 8)),
90 => std_logic_vector(to_unsigned(25, 8)),
91 => std_logic_vector(to_unsigned(25, 8)),
92 => std_logic_vector(to_unsigned(26, 8)),
93 => std_logic_vector(to_unsigned(27, 8)),
94 => std_logic_vector(to_unsigned(27, 8)),
95 => std_logic_vector(to_unsigned(28, 8)),
96 => std_logic_vector(to_unsigned(29, 8)),
97 => std_logic_vector(to_unsigned(29, 8)),
98 => std_logic_vector(to_unsigned(30, 8)),
99 => std_logic_vector(to_unsigned(31, 8)),
100 => std_logic_vector(to_unsigned(31, 8)),
101 => std_logic_vector(to_unsigned(32, 8)),
102 => std_logic_vector(to_unsigned(33, 8)),
103 => std_logic_vector(to_unsigned(34, 8)),
104 => std_logic_vector(to_unsigned(34, 8)),
105 => std_logic_vector(to_unsigned(35, 8)),
106 => std_logic_vector(to_unsigned(36, 8)),
107 => std_logic_vector(to_unsigned(37, 8)),
108 => std_logic_vector(to_unsigned(37, 8)),
109 => std_logic_vector(to_unsigned(38, 8)),
110 => std_logic_vector(to_unsigned(39, 8)),
111 => std_logic_vector(to_unsigned(40, 8)),
112 => std_logic_vector(to_unsigned(40, 8)),
113 => std_logic_vector(to_unsigned(41, 8)),
114 => std_logic_vector(to_unsigned(42, 8)),
115 => std_logic_vector(to_unsigned(43, 8)),
116 => std_logic_vector(to_unsigned(44, 8)),
117 => std_logic_vector(to_unsigned(45, 8)),
118 => std_logic_vector(to_unsigned(46, 8)),
119 => std_logic_vector(to_unsigned(46, 8)),
120 => std_logic_vector(to_unsigned(47, 8)),
121 => std_logic_vector(to_unsigned(48, 8)),
122 => std_logic_vector(to_unsigned(49, 8)),
123 => std_logic_vector(to_unsigned(50, 8)),
124 => std_logic_vector(to_unsigned(51, 8)),
125 => std_logic_vector(to_unsigned(52, 8)),
126 => std_logic_vector(to_unsigned(53, 8)),
127 => std_logic_vector(to_unsigned(54, 8)),
128 => std_logic_vector(to_unsigned(55, 8)),
129 => std_logic_vector(to_unsigned(56, 8)),
130 => std_logic_vector(to_unsigned(57, 8)),
131 => std_logic_vector(to_unsigned(58, 8)),
132 => std_logic_vector(to_unsigned(59, 8)),
133 => std_logic_vector(to_unsigned(60, 8)),
134 => std_logic_vector(to_unsigned(61, 8)),
135 => std_logic_vector(to_unsigned(62, 8)),
136 => std_logic_vector(to_unsigned(63, 8)),
137 => std_logic_vector(to_unsigned(64, 8)),
138 => std_logic_vector(to_unsigned(65, 8)),
139 => std_logic_vector(to_unsigned(66, 8)),
140 => std_logic_vector(to_unsigned(67, 8)),
141 => std_logic_vector(to_unsigned(68, 8)),
142 => std_logic_vector(to_unsigned(69, 8)),
143 => std_logic_vector(to_unsigned(70, 8)),
144 => std_logic_vector(to_unsigned(71, 8)),
145 => std_logic_vector(to_unsigned(72, 8)),
146 => std_logic_vector(to_unsigned(73, 8)),
147 => std_logic_vector(to_unsigned(74, 8)),
148 => std_logic_vector(to_unsigned(76, 8)),
149 => std_logic_vector(to_unsigned(77, 8)),
150 => std_logic_vector(to_unsigned(78, 8)),
151 => std_logic_vector(to_unsigned(79, 8)),
152 => std_logic_vector(to_unsigned(80, 8)),
153 => std_logic_vector(to_unsigned(81, 8)),
154 => std_logic_vector(to_unsigned(83, 8)),
155 => std_logic_vector(to_unsigned(84, 8)),
156 => std_logic_vector(to_unsigned(85, 8)),
157 => std_logic_vector(to_unsigned(86, 8)),
158 => std_logic_vector(to_unsigned(88, 8)),
159 => std_logic_vector(to_unsigned(89, 8)),
160 => std_logic_vector(to_unsigned(90, 8)),
161 => std_logic_vector(to_unsigned(91, 8)),
162 => std_logic_vector(to_unsigned(93, 8)),
163 => std_logic_vector(to_unsigned(94, 8)),
164 => std_logic_vector(to_unsigned(95, 8)),
165 => std_logic_vector(to_unsigned(96, 8)),
166 => std_logic_vector(to_unsigned(98, 8)),
167 => std_logic_vector(to_unsigned(99, 8)),
168 => std_logic_vector(to_unsigned(100, 8)),
169 => std_logic_vector(to_unsigned(102, 8)),
170 => std_logic_vector(to_unsigned(103, 8)),
171 => std_logic_vector(to_unsigned(104, 8)),
172 => std_logic_vector(to_unsigned(106, 8)),
173 => std_logic_vector(to_unsigned(107, 8)),
174 => std_logic_vector(to_unsigned(109, 8)),
175 => std_logic_vector(to_unsigned(110, 8)),
176 => std_logic_vector(to_unsigned(111, 8)),
177 => std_logic_vector(to_unsigned(113, 8)),
178 => std_logic_vector(to_unsigned(114, 8)),
179 => std_logic_vector(to_unsigned(116, 8)),
180 => std_logic_vector(to_unsigned(117, 8)),
181 => std_logic_vector(to_unsigned(119, 8)),
182 => std_logic_vector(to_unsigned(120, 8)),
183 => std_logic_vector(to_unsigned(121, 8)),
184 => std_logic_vector(to_unsigned(123, 8)),
185 => std_logic_vector(to_unsigned(124, 8)),
186 => std_logic_vector(to_unsigned(126, 8)),
187 => std_logic_vector(to_unsigned(128, 8)),
188 => std_logic_vector(to_unsigned(129, 8)),
189 => std_logic_vector(to_unsigned(131, 8)),
190 => std_logic_vector(to_unsigned(132, 8)),
191 => std_logic_vector(to_unsigned(134, 8)),
192 => std_logic_vector(to_unsigned(135, 8)),
193 => std_logic_vector(to_unsigned(137, 8)),
194 => std_logic_vector(to_unsigned(138, 8)),
195 => std_logic_vector(to_unsigned(140, 8)),
196 => std_logic_vector(to_unsigned(142, 8)),
197 => std_logic_vector(to_unsigned(143, 8)),
198 => std_logic_vector(to_unsigned(145, 8)),
199 => std_logic_vector(to_unsigned(146, 8)),
200 => std_logic_vector(to_unsigned(148, 8)),
201 => std_logic_vector(to_unsigned(150, 8)),
202 => std_logic_vector(to_unsigned(151, 8)),
203 => std_logic_vector(to_unsigned(153, 8)),
204 => std_logic_vector(to_unsigned(155, 8)),
205 => std_logic_vector(to_unsigned(157, 8)),
206 => std_logic_vector(to_unsigned(158, 8)),
207 => std_logic_vector(to_unsigned(160, 8)),
208 => std_logic_vector(to_unsigned(162, 8)),
209 => std_logic_vector(to_unsigned(163, 8)),
210 => std_logic_vector(to_unsigned(165, 8)),
211 => std_logic_vector(to_unsigned(167, 8)),
212 => std_logic_vector(to_unsigned(169, 8)),
213 => std_logic_vector(to_unsigned(170, 8)),
214 => std_logic_vector(to_unsigned(172, 8)),
215 => std_logic_vector(to_unsigned(174, 8)),
216 => std_logic_vector(to_unsigned(176, 8)),
217 => std_logic_vector(to_unsigned(178, 8)),
218 => std_logic_vector(to_unsigned(179, 8)),
219 => std_logic_vector(to_unsigned(181, 8)),
220 => std_logic_vector(to_unsigned(183, 8)),
221 => std_logic_vector(to_unsigned(185, 8)),
222 => std_logic_vector(to_unsigned(187, 8)),
223 => std_logic_vector(to_unsigned(189, 8)),
224 => std_logic_vector(to_unsigned(191, 8)),
225 => std_logic_vector(to_unsigned(193, 8)),
226 => std_logic_vector(to_unsigned(194, 8)),
227 => std_logic_vector(to_unsigned(196, 8)),
228 => std_logic_vector(to_unsigned(198, 8)),
229 => std_logic_vector(to_unsigned(200, 8)),
230 => std_logic_vector(to_unsigned(202, 8)),
231 => std_logic_vector(to_unsigned(204, 8)),
232 => std_logic_vector(to_unsigned(206, 8)),
233 => std_logic_vector(to_unsigned(208, 8)),
234 => std_logic_vector(to_unsigned(210, 8)),
235 => std_logic_vector(to_unsigned(212, 8)),
236 => std_logic_vector(to_unsigned(214, 8)),
237 => std_logic_vector(to_unsigned(216, 8)),
238 => std_logic_vector(to_unsigned(218, 8)),
239 => std_logic_vector(to_unsigned(220, 8)),
240 => std_logic_vector(to_unsigned(222, 8)),
241 => std_logic_vector(to_unsigned(224, 8)),
242 => std_logic_vector(to_unsigned(227, 8)),
243 => std_logic_vector(to_unsigned(229, 8)),
244 => std_logic_vector(to_unsigned(231, 8)),
245 => std_logic_vector(to_unsigned(233, 8)),
246 => std_logic_vector(to_unsigned(235, 8)),
247 => std_logic_vector(to_unsigned(237, 8)),
248 => std_logic_vector(to_unsigned(239, 8)),
249 => std_logic_vector(to_unsigned(241, 8)),
250 => std_logic_vector(to_unsigned(244, 8)),
251 => std_logic_vector(to_unsigned(246, 8)),
252 => std_logic_vector(to_unsigned(248, 8)),
253 => std_logic_vector(to_unsigned(250, 8)),
254 => std_logic_vector(to_unsigned(252, 8)),
255 => std_logic_vector(to_unsigned(255, 8))
);
begin
pixelData_out <= gamma_table(to_integer(unsigned(pixelData_in)));
end architecture RTL;
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