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lpc_colors.c
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1 /*
2 * @brief SWIM color definitions and palette table setup
3 *
4 * @note
5 * Copyright(C) NXP Semiconductors, 2012
6 * All rights reserved.
7 *
8 * @par
9 * Software that is described herein is for illustrative purposes only
10 * which provides customers with programming information regarding the
11 * LPC products. This software is supplied "AS IS" without any warranties of
12 * any kind, and NXP Semiconductors and its licensor disclaim any and
13 * all warranties, express or implied, including all implied warranties of
14 * merchantability, fitness for a particular purpose and non-infringement of
15 * intellectual property rights. NXP Semiconductors assumes no responsibility
16 * or liability for the use of the software, conveys no license or rights under any
17 * patent, copyright, mask work right, or any other intellectual property rights in
18 * or to any products. NXP Semiconductors reserves the right to make changes
19 * in the software without notification. NXP Semiconductors also makes no
20 * representation or warranty that such application will be suitable for the
21 * specified use without further testing or modification.
22 *
23 * @par
24 * Permission to use, copy, modify, and distribute this software and its
25 * documentation is hereby granted, under NXP Semiconductors' and its
26 * licensor's relevant copyrights in the software, without fee, provided that it
27 * is used in conjunction with NXP Semiconductors microcontrollers. This
28 * copyright, permission, and disclaimer notice must appear in all copies of
29 * this code.
30 */
31
32 #include "lpc_colors.h"
33
34 /*****************************************************************************
35 * Private types/enumerations/variables
36 ****************************************************************************/
37
38 /*****************************************************************************
39 * Public types/enumerations/variables
40 ****************************************************************************/
41
42 /*****************************************************************************
43 * Private functions
44 ****************************************************************************/
45
46 /*****************************************************************************
47 * Public functions
48 ****************************************************************************/
49
50 /* Generate a palette table (only in 8-bit mode) */
51 void lpc_colors_set_palette(uint16_t *palette_table)
52 {
53 #if COLORS_DEF == 8
54 int32_t idx;
55 uint16_t entry, r, g, b;
56
57 /* 256 entries */
58 for (idx = 0; idx < NUM_COLORS; idx++) {
59 r = ((uint16_t) idx & REDMASK) >> REDSHIFT;
60 g = ((uint16_t) idx & GREENMASK) >> GREENSHIFT;
61 b = ((uint16_t) idx & BLUEMASK) >> BLUESHIFT;
62
63 #ifdef COLORS_8_565_MODE
64 /* Strip out and scale colors */
65 r = r * 0x1F / ((REDMASK >> REDSHIFT) + 1);
66 g = g * 0x3F / ((GREENMASK >> GREENSHIFT) + 1);
67 b = b * 0x1F / ((BLUEMASK >> BLUESHIFT) + 1);
68 entry = b + (g << 5) + (r << 11);
69
70 #else
71 /* Strip out and scale colors */
72 r = r * 0x1F / ((REDMASK >> REDSHIFT) + 1);
73 g = g * 0x1F / ((GREENMASK >> GREENSHIFT) + 1);
74 b = b * 0x1F / ((BLUEMASK >> BLUESHIFT) + 1);
75 entry = b + (g << 5) + (r << 10);
76 #endif
77
78 /* Save palette entry */
79 palette_table[idx] = entry;
80 }
81 #endif /* COLORS_DEF == 8 */
82 }