ARM+LINUX移植攻略（十）支持东华 3.5寸LCD输出console信息和BMP图片、logo
哈尔滨理工大学软件工程专业08-7李万鹏原创作品，转载请标明出处http://blog.csdn.net/woshixingaaa/archive/2011/02/19/6194637.aspx
由于linux启动代码，仍然出现乱码，而我将启动信息输出到lcd就没有乱码。暂时这个问题还没有解决，lcd其实早已完成，今天整理下，再解决那个问题。
下面是我绘制的主要的lcd驱动调用流程图。start_armboot()在lib_arm/board.c中，stdio_init()在common/stdio.cdrv_video_init(),video_init(),video_logo (),video_fb_address(）在drivers/video/cfb_console.c中，video_hw_init()在drivers/video/s3c2410_fb.c中，board_video_init()在board/samsung/TE2440II/TE2440II.c。
http://hi.csdn.net/attachment/201102/24/0_1298507642i6Fo.gif
最终调用了board_video_init()函数，这个函数由我们自己来编写，由于以前写过裸机的lcd程序，所以时序就可以直接拿来用，不用调了，哈哈。在这个函数中主要还是对那5个lcd的控制寄存器进行初始化。这里要注意根据不同的屏，进行x,y的调整，我用的是东华WXCAT35-TG3#001，主要就是初始化一个GraphicDevice *pGD结构体。
#define MVAL(0)#define MVAL_USED (0)//0=each frame 1=rate by MVAL#define INVVDEN(0)//0=normal 1=inverted#define BSWP(0)//Byte swap control#define HWSWP(0)//Half word swap control//TFT 240320#define LCD_XSIZE_TFT_240320 (320)#define LCD_YSIZE_TFT_240320 (240)//TFT240320#define HOZVAL_TFT_240320(LCD_XSIZE_TFT_240320-1)#define LINEVAL_TFT_240320(LCD_YSIZE_TFT_240320-1)//Timing parameter for WXCAT35-TG3#001"#define VBPD_240320(3)#define VFPD_240320(5)#define VSPW_240320(15)#define HBPD_240320(58)#define HFPD_240320(15)#define HSPW_240320_WXCAT35(8)//Adjust the horizontal displacement of the screen #define CLKVAL_TFT_240320(7) //FCLK=405MHz,HCLK=101.25MHz,VCLK=4602272Hzvoid board_video_init(GraphicDevice *pGD) { S3C24X0_LCD * const lcd = S3C24X0_GetBase_LCD(); S3C2410_NAND * const nand = S3C2410_GetBase_NAND(); /* FIXME: select LCM type by env variable *//* Configuration for GTA01 LCM on QT2410 */ lcd->LCDCON1 = 0x00000778; /* CLKVAL=7, BPPMODE=16bpp, TFT, ENVID=0 */ lcd->LCDCON2 = (VBPD_240320<<24)|(LINEVAL_TFT_240320<<14)|(VFPD_240320<<6)|(VSPW_240320); lcd->LCDCON3 = (HBPD_240320<<19)|(HOZVAL_TFT_240320<<8)|(HFPD_240320); lcd->LCDCON4 = (MVAL<<8)|(HSPW_240320_WXCAT35);lcd->LCDCON5 = 0x00000f09; lcd->LPCSEL= 0x00000000; }
明白上边的流程后一切变得很简单，只要根据自己的屏调整好时序就行了。添加一个驱动文件这个是一个外国的牛人已经写好的。在drivers/video/下添加s3c2410_fb.c。代码如下：
/** (C) Copyright 2006 by OpenMoko, Inc.* Author: Harald Welte <laforge@openmoko.org>** This program is free software; you can redistribute it and/or* modify it under the terms of the GNU General Public License as* published by the Free Software Foundation; either version 2 of* the License, or (at your option) any later version.** This program is distributed in the hope that it will be useful,* but WITHOUT ANY WARRANTY; without even the implied warranty of* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the* GNU General Public License for more details.** You should have received a copy of the GNU General Public License* along with this program; if not, write to the Free Software* Foundation, Inc., 59 Temple Place, Suite 330, Boston,* MA 02111-1307 USA*/#include <common.h>#if defined(CONFIG_VIDEO_S3C2410)#include <video_fb.h>#include "videomodes.h"#include <s3c2410.h>/** Export Graphic Device*/GraphicDevice smi;#define VIDEO_MEM_SIZE 0x200000 /* 240x320x16bit = 0x25800 bytes */extern void board_video_init(GraphicDevice *pGD);/********************************************************************************* Init video chip with common Linux graphic modes (lilo)*/void *video_hw_init (void){S3C24X0_LCD * const lcd = S3C24X0_GetBase_LCD();GraphicDevice *pGD = (GraphicDevice *)&smi;int videomode;unsigned long t1, hsynch, vsynch;char *penv;int tmp, i, bits_per_pixel;struct ctfb_res_modes *res_mode;struct ctfb_res_modes var_mode;// unsigned char videoout;/* Search for video chip */printf("Video: ");tmp = 0;videomode = CFG_SYS_DEFAULT_VIDEO_MODE;/* get video mode via environment */if ((penv = getenv ("videomode")) != NULL) {/* deceide if it is a string */if (penv <= '9') {videomode = (int) simple_strtoul (penv, NULL, 16);tmp = 1;}} else {tmp = 1;}if (tmp) {/* parameter are vesa modes *//* search params */for (i = 0; i < VESA_MODES_COUNT; i++) {if (vesa_modes.vesanr == videomode)break;}if (i == VESA_MODES_COUNT) {printf ("no VESA Mode found, switching to mode 0x%x ",CFG_SYS_DEFAULT_VIDEO_MODE);i = 0;}res_mode =(struct ctfb_res_modes *) &res_mode_init.resindex];bits_per_pixel = vesa_modes.bits_per_pixel;} else {res_mode = (struct ctfb_res_modes *) &var_mode;bits_per_pixel = video_get_params (res_mode, penv);}/* calculate hsynch and vsynch freq (info only) */t1 = (res_mode->left_margin + res_mode->xres +res_mode->right_margin + res_mode->hsync_len) / 8;t1 *= 8;t1 *= res_mode->pixclock;t1 /= 1000;hsynch = 1000000000L / t1;t1 *=(res_mode->upper_margin + res_mode->yres +res_mode->lower_margin + res_mode->vsync_len);t1 /= 1000;vsynch = 1000000000L / t1;/* fill in Graphic device struct */sprintf (pGD->modeIdent, "%dx%dx%d %ldkHz %ldHz", res_mode->xres,res_mode->yres, bits_per_pixel, (hsynch / 1000),(vsynch / 1000));printf ("%s\n", pGD->modeIdent);pGD->winSizeX = res_mode->xres;pGD->winSizeY = res_mode->yres;pGD->plnSizeX = res_mode->xres;pGD->plnSizeY = res_mode->yres;switch (bits_per_pixel) {case 8:pGD->gdfBytesPP = 1;pGD->gdfIndex = GDF__8BIT_INDEX;break;case 15:pGD->gdfBytesPP = 2;pGD->gdfIndex = GDF_15BIT_555RGB;break;case 16:pGD->gdfBytesPP = 2;pGD->gdfIndex = GDF_16BIT_565RGB;break;case 24:pGD->gdfBytesPP = 3;pGD->gdfIndex = GDF_24BIT_888RGB;break;}/* statically configure settings */pGD->winSizeX = pGD->plnSizeX = 320;pGD->winSizeY = pGD->plnSizeY = 240;pGD->gdfBytesPP = 2;pGD->gdfIndex = GDF_16BIT_565RGB;pGD->frameAdrs = LCD_VIDEO_ADDR;pGD->memSize = VIDEO_MEM_SIZE;board_video_init(pGD);lcd->LCDSADDR1 = pGD->frameAdrs >> 1;/* This marks the end of the frame buffer. */lcd->LCDSADDR2 = (lcd->LCDSADDR1&0x1fffff) + (pGD->winSizeX+0) * pGD->winSizeY;lcd->LCDSADDR3 = (pGD->winSizeX & 0x7ff);/* Clear video memory */memset((void *)pGD->frameAdrs, 0, pGD->memSize);/* Enable Display */lcd->LCDCON1 |= 0x01; /* ENVID = 1 */return ((void*)&smi);}voidvideo_set_lut (unsigned int index, /* color number */unsigned char r, /* red */unsigned char g, /* green */unsigned char b /* blue */){}#endif /* CONFIG_VIDEO_S3C2410 */
在你的配置头文件中添加如下宏定义：
#define CONFIG_CMD_BMP#define CONFIG_VIDEO#define CONFIG_VIDEO_S3C2410#define CONFIG_VIDEO_LOGO#define VIDEO_FB_16BPP_PIXEL_SWAP#define CONFIG_VIDEO_SW_CURSOR#define CONFIG_VIDEO_BMP_LOGO
这样就基本完成了，重新启动一下是不是就显示出samsung的logo了。如果先改成自己喜欢的图片，修改tools/logos/denx.bmp，记住一定是是8bpp的bmp图，修改Makefile文件，修改/tools目录下的Makefile文件，大约是44~46行，
ifeq ($(LOGO_BMP),)LOGO_BMP= logos/denx.bmpendif
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