lpc_colors.c

00001 /*
00002  * @brief SWIM color definitions and palette table setup
00003  *
00004  * @note
00005  * Copyright(C) NXP Semiconductors, 2012
00006  * All rights reserved.
00007  *
00008  * @par
00009  * Software that is described herein is for illustrative purposes only
00010  * which provides customers with programming information regarding the
00011  * LPC products.  This software is supplied "AS IS" without any warranties of
00012  * any kind, and NXP Semiconductors and its licensor disclaim any and
00013  * all warranties, express or implied, including all implied warranties of
00014  * merchantability, fitness for a particular purpose and non-infringement of
00015  * intellectual property rights.  NXP Semiconductors assumes no responsibility
00016  * or liability for the use of the software, conveys no license or rights under any
00017  * patent, copyright, mask work right, or any other intellectual property rights in
00018  * or to any products. NXP Semiconductors reserves the right to make changes
00019  * in the software without notification. NXP Semiconductors also makes no
00020  * representation or warranty that such application will be suitable for the
00021  * specified use without further testing or modification.
00022  *
00023  * @par
00024  * Permission to use, copy, modify, and distribute this software and its
00025  * documentation is hereby granted, under NXP Semiconductors' and its
00026  * licensor's relevant copyrights in the software, without fee, provided that it
00027  * is used in conjunction with NXP Semiconductors microcontrollers.  This
00028  * copyright, permission, and disclaimer notice must appear in all copies of
00029  * this code.
00030  */
00031 
00032 #include "lpc_colors.h"
00033 
00034 /*****************************************************************************
00035  * Private types/enumerations/variables
00036  ****************************************************************************/
00037 
00038 /*****************************************************************************
00039  * Public types/enumerations/variables
00040  ****************************************************************************/
00041 
00042 /*****************************************************************************
00043  * Private functions
00044  ****************************************************************************/
00045 
00046 /*****************************************************************************
00047  * Public functions
00048  ****************************************************************************/
00049 
00050 /* Generate a palette table (only in 8-bit mode) */
00051 void lpc_colors_set_palette(uint16_t *palette_table)
00052 {
00053 #if COLORS_DEF == 8
00054     int32_t idx;
00055     uint16_t entry, r, g, b;
00056 
00057     /* 256 entries */
00058     for (idx = 0; idx < NUM_COLORS; idx++) {
00059         r = ((uint16_t) idx & REDMASK) >> REDSHIFT;
00060         g = ((uint16_t) idx & GREENMASK) >> GREENSHIFT;
00061         b = ((uint16_t) idx & BLUEMASK) >> BLUESHIFT;
00062 
00063 #ifdef COLORS_8_565_MODE
00064         /* Strip out and scale colors */
00065         r = r * 0x1F / ((REDMASK >> REDSHIFT) + 1);
00066         g = g * 0x3F / ((GREENMASK >> GREENSHIFT) + 1);
00067         b = b * 0x1F / ((BLUEMASK >> BLUESHIFT) + 1);
00068         entry = b + (g << 5) + (r << 11);
00069 
00070 #else
00071         /* Strip out and scale colors */
00072         r = r * 0x1F / ((REDMASK >> REDSHIFT) + 1);
00073         g = g * 0x1F / ((GREENMASK >> GREENSHIFT) + 1);
00074         b = b * 0x1F / ((BLUEMASK >> BLUESHIFT) + 1);
00075         entry = b + (g << 5) + (r << 10);
00076 #endif
00077 
00078         /* Save palette entry */
00079         palette_table[idx] = entry;
00080     }
00081 #endif /* COLORS_DEF == 8 */
00082 }
00083