1 /* $NetBSD: iq80310_7seg.c,v 1.10 2011/07/01 20:41:16 dyoung Exp $ */
2
3 /*
4 * Copyright (c) 2001, 2002 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 /*
39 * Support for the 7-segment display on the Intel IQ80310.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: iq80310_7seg.c,v 1.10 2011/07/01 20:41:16 dyoung Exp $");
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47
48 #include <sys/bus.h>
49
50 #include <evbarm/iq80310/iq80310reg.h>
51 #include <evbarm/iq80310/iq80310var.h>
52 #include <evbarm/iq80310/obiovar.h>
53
54 static int snakestate;
55
56 /*
57 * The 7-segment display looks like so:
58 *
59 * A
60 * +-----+
61 * | |
62 * F | | B
63 * | G |
64 * +-----+
65 * | |
66 * E | | C
67 * | D |
68 * +-----+ o DP
69 *
70 * Setting a bit clears the corresponding segment on the
71 * display.
72 */
73 #define SEG_A (1 << 0)
74 #define SEG_B (1 << 1)
75 #define SEG_C (1 << 2)
76 #define SEG_D (1 << 3)
77 #define SEG_E (1 << 4)
78 #define SEG_F (1 << 5)
79 #define SEG_G (1 << 6)
80 #define SEG_DP (1 << 7)
81
82 static const uint8_t digitmap[] = {
83 /* +#####+
84 * # #
85 * # #
86 * # #
87 * +-----+
88 * # #
89 * # #
90 * # #
91 * +#####+
92 */
93 SEG_G,
94
95 /* +-----+
96 * | #
97 * | #
98 * | #
99 * +-----+
100 * | #
101 * | #
102 * | #
103 * +-----+
104 */
105 SEG_A|SEG_D|SEG_E|SEG_F|SEG_G,
106
107 /* +#####+
108 * | #
109 * | #
110 * | #
111 * +#####+
112 * # |
113 * # |
114 * # |
115 * +#####+
116 */
117 SEG_C|SEG_F,
118
119 /* +#####+
120 * | #
121 * | #
122 * | #
123 * +#####+
124 * | #
125 * | #
126 * | #
127 * +#####+
128 */
129 SEG_E|SEG_F,
130
131 /* +-----+
132 * # #
133 * # #
134 * # #
135 * +#####+
136 * | #
137 * | #
138 * | #
139 * +-----+
140 */
141 SEG_A|SEG_D|SEG_E,
142
143 /* +#####+
144 * # |
145 * # |
146 * # |
147 * +#####+
148 * | #
149 * | #
150 * | #
151 * +#####+
152 */
153 SEG_B|SEG_E,
154
155 /* +#####+
156 * # |
157 * # |
158 * # |
159 * +#####+
160 * # #
161 * # #
162 * # #
163 * +#####+
164 */
165 SEG_B,
166
167 /* +#####+
168 * | #
169 * | #
170 * | #
171 * +-----+
172 * | #
173 * | #
174 * | #
175 * +-----+
176 */
177 SEG_D|SEG_E|SEG_F,
178
179 /* +#####+
180 * # #
181 * # #
182 * # #
183 * +#####+
184 * # #
185 * # #
186 * # #
187 * +#####+
188 */
189 0,
190
191 /* +#####+
192 * # #
193 * # #
194 * # #
195 * +#####+
196 * | #
197 * | #
198 * | #
199 * +-----+
200 */
201 SEG_D|SEG_E,
202 };
203
204 static uint8_t
iq80310_7seg_xlate(char c)205 iq80310_7seg_xlate(char c)
206 {
207 uint8_t rv;
208
209 if (c >= '0' && c <= '9')
210 rv = digitmap[c - '0'];
211 else if (c == '.')
212 rv = (uint8_t) ~SEG_DP;
213 else
214 rv = 0xff;
215
216 return (rv);
217 }
218
219 void
iq80310_7seg(char a,char b)220 iq80310_7seg(char a, char b)
221 {
222 uint8_t msb, lsb;
223
224 msb = iq80310_7seg_xlate(a);
225 lsb = iq80310_7seg_xlate(b);
226
227 snakestate = 0;
228
229 CPLD_WRITE(IQ80310_7SEG_MSB, msb);
230 CPLD_WRITE(IQ80310_7SEG_LSB, lsb);
231 }
232
233 static const uint8_t snakemap[][2] = {
234
235 /* +#####+ +#####+
236 * | | | |
237 * | | | |
238 * | | | |
239 * +-----+ +-----+
240 * | | | |
241 * | | | |
242 * | | | |
243 * +-----+ +-----+
244 */
245 { ~SEG_A, ~SEG_A },
246
247 /* +-----+ +-----+
248 * # | | #
249 * # | | #
250 * # | | #
251 * +-----+ +-----+
252 * | | | |
253 * | | | |
254 * | | | |
255 * +-----+ +-----+
256 */
257 { ~SEG_F, ~SEG_B },
258
259 /* +-----+ +-----+
260 * | | | |
261 * | | | |
262 * | | | |
263 * +#####+ +#####+
264 * | | | |
265 * | | | |
266 * | | | |
267 * +-----+ +-----+
268 */
269 { ~SEG_G, ~SEG_G },
270
271 /* +-----+ +-----+
272 * | | | |
273 * | | | |
274 * | | | |
275 * +-----+ +-----+
276 * | # # |
277 * | # # |
278 * | # # |
279 * +-----+ +-----+
280 */
281 { ~SEG_C, ~SEG_E },
282
283 /* +-----+ +-----+
284 * | | | |
285 * | | | |
286 * | | | |
287 * +-----+ +-----+
288 * | | | |
289 * | | | |
290 * | | | |
291 * +#####+ +#####+
292 */
293 { ~SEG_D, ~SEG_D },
294
295 /* +-----+ +-----+
296 * | | | |
297 * | | | |
298 * | | | |
299 * +-----+ +-----+
300 * # | | #
301 * # | | #
302 * # | | #
303 * +-----+ +-----+
304 */
305 { ~SEG_E, ~SEG_C },
306
307 /* +-----+ +-----+
308 * | | | |
309 * | | | |
310 * | | | |
311 * +#####+ +#####+
312 * | | | |
313 * | | | |
314 * | | | |
315 * +-----+ +-----+
316 */
317 { ~SEG_G, ~SEG_G },
318
319 /* +-----+ +-----+
320 * | # # |
321 * | # # |
322 * | # # |
323 * +-----+ +-----+
324 * | | | |
325 * | | | |
326 * | | | |
327 * +-----+ +-----+
328 */
329 { ~SEG_B, ~SEG_F },
330 };
331
332 void
iq80310_7seg_snake(void)333 iq80310_7seg_snake(void)
334 {
335 int cur = snakestate;
336
337 CPLD_WRITE(IQ80310_7SEG_MSB, snakemap[cur][0]);
338 CPLD_WRITE(IQ80310_7SEG_LSB, snakemap[cur][1]);
339
340 snakestate = (cur + 1) & 7;
341 }
342