fl2440的U-boot-2010.09移植（七）LCD的支持

一、LCD时序配置

fl2440开发板的LCD是3.5寸屏型号是WXCAT35-TG3#001，这是一款320x240分辨率的TFT LCD屏，先来了解一下TFT LCD的时序如下：

图1 TFT LCD时序

（1）VSYNC信号来一个脉冲时，表示一帧的开始

（2） VSPW表示VSYNC信号的脉冲宽度为（VSPW+1）个HSYNC信号周期，即（VSPW+1）行，这（VSPW+1）行的数据无效。

（3）VSYNC信号脉冲之后，还要经过（VBPD+1）个（HSYNC）信号周期，有效的行数据才出现。所以，在VSYNC信号有效之后，总共还要经过（VSPW+1+VBPD+1）个无效行，

（4）随后连续发出（LINEVAL+1）行的有效数据

（5）最后是（VFPD+1）个无效行，完整的一帧结束，紧接着就是下一帧的数据了（即下一个VSYNC信号）。

（6）HSYNC信号有效时，表示一行数据的开始

（7） HSPW表示HSYNC信号的脉冲宽度为（HSPW+1）个VCLK信号周期，即（HSPW+1）个像素，这（HSPW+1）个像素的数据无效。

（8）HSYNC信号脉冲之后，还要经过（HBPD+1）个VCLK信号周期，有效的像素数据才会出现。所以，在HSYNC信号有效之后，总共还要经过（HSPW + 1 + HBPD + 1）个无效的像素，第一个有效像素才出现。

（9）随后即连续发出（HOZVAL+1）个像素的有效数据。

（10）最后是（HFPD+1）个无效的像素，完整的一行结束，紧接着就是下一行的数据了（即下一个HSYNC信号）。

TFT LCD的正常工作主要需要配置S3C2440的寄存器LCDCON1~LCDCON5。

二、u-boot支持LCD的配置工作

首先要添加一个文件，driver/video/s3c2410_fb.c，其内容为：/* * (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)||defined(CONFIG_VIDEO_S3C2440) #include <video_fb.h>#include <asm/arch/s3c2410.h>#include "videomodes.h"/* * Export Graphic Device */static GraphicDevice smi; #define VIDEO_MEM_SIZE 0x200000 /* 240x320x16bit = 0x25800 bytes */ extern void board_video_init( GraphicDevice *pGD);/* * Add by yanghao *//******************************************************************************* * * Init video chip with common Linux graphic modes (lilo) */void *video_hw_init (void){ struct s3c24x0_lcd * const lcd = s3c24x0_get_base_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 = CONFIG_SYS_DEFAULT_VIDEO_MODE; /* get video mode via environment */ if ((penv = getenv ("videomode")) != NULL) { /* deceide if it is a string */ if (penv[0] <= '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[i].vesanr == videomode) break; } if (i == VESA_MODES_COUNT) { printf ("no VESA Mode found, switching to mode 0x%x ", CONFIG_SYS_DEFAULT_VIDEO_MODE); i = 0; } res_mode = (struct ctfb_res_modes *) &res_mode_init[vesa_modes[i]. resindex]; bits_per_pixel = vesa_modes[i].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); } #endif /* CONFIG_VIDEO_S3C2410 */

修改driver/video/videomodes.h文件第25行左右为：

#ifndef CONFIG_SYS_DEFAULT_VIDEO_MODE//#define CONFIG_SYS_DEFAULT_VIDEO_MODE 0x301#define CONFIG_SYS_DEFAULT_VIDEO_MODE0x211#endif

紧接着修改driver/video/videomodes.h第81行左右为：

#define RES_MODE_1280x10245#define RES_MODE_240x320 6#define RES_MODES_COUNT7#define VESA_MODES_COUNT 20

在driver/video/videomodes..c文件struct ctfb_vesa_modes vesa_modes定义中添加（第78行左右）本开发板LCD的相关配置：

{0x211, RES_MODE_240x320, 16},

在driver/video/videomodes..c文件struct ctfb_res_modes res_mode_init定义中添加（第100行左右）本开发板LCD的相关配置：

{320, 240, 158025, 58, 15, 3, 5, 8, 15, 0, FB_VMODE_NONINTERLACED},

紧接着修改driver/video/Makefile文件，在41行后添加：

COBJS-$(CONFIG_VIDEO_S3C2440) += videomodes.oCOBJS-$(CONFIG_VIDEO_S3C2440) += s3c2410_fb.o

最后，修改文件board/fl2440/fl2440.c，在文件最后添加：

/* * Add by yanghao */#if defined(CONFIG_VIDEO_S3C2440)#define MVAL (13)#define MVAL_USED (0)#define INVVDEN (1)#define BSWP (0)#define HWSWP (1)//TFT 240320#define LCD_XSIZE_TFT_240320 (320)#define LCD_YSIZE_TFT_240320 (240)//TFT 240320#define HOZVAL_TFT_240320 (LCD_XSIZE_TFT_240320-1)#define LINEVAL_TFT_240320 (LCD_YSIZE_TFT_240320-1)//Timing parameter for WXCAT35-TG#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){ struct s3c24x0_lcd * const lcd = s3c24x0_get_base_lcd(); /*Configuration for fl2440*/ lcd->LCDCON1 = (CLKVAL_TFT_240320 <<8)|(MVAL_USED <<7)|(3<<5)|(12<<1)|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 = (1<<11)|(1<<9)|(1<<8)|(1<<3)|(BSWP<<1)|(HWSWP); lcd->LPCSEL = 0x00000000;}#endif /*CONFIG_VIDEO_S3C2440*/

最后还需要在开发板配置文件中添加LCD屏支持的宏定义，修改文件include/configs/fl2440.h文件，在文件中添加：

#include <video_fb.h> //头文件定义处添加/*****************add by yanghao support LCD文件末尾处添加********************//*LCD support*/#define CONFIG_VIDEO_S3C2440 1#define CONFIG_VIDEO_LOGO 1#define CONFIG_VIDEO_BMP_LOGO 1#define VIDEO_FB_16BPP_WORD_SWAP 1#define CONFIG_CMD_BMP 1//#define CONFIG_LCD 1#define CONFIG_VIDEO 1#define CONFIG_CFB_CONSOLE 1#define CFG_CONSOLE_INFO_QUIET //support display of console information at boot#define LCD_VIDEO_ADDR 0x33b00000/*for PC-keyboard*/#define VIDEO_KBD_INIT_FCT 0/*for PC-keyboard*/#define VIDEO_TSTC_FCT serial_tstc#define VIDEO_GETC_FCT serial_getc#define CONFIG_SERIAL_MULTI 1/*LCD support*/

重新上电后，uboot的输出就都显示在LCD上了，我们的输入还是选择的串口输入，输入信息也都显示在LCD屏之上效果图如下：

我把uboot的原始显示图片给替换掉了，故显示如上，图片上有些个人信息被我抹掉了。