<2012 12 05> FL2440开发板的U-boot-2010.09版本移植（八）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：

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/*

* (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：

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#ifndef CONFIG_SYS_DEFAULT_VIDEO_MODE

//#define CONFIG_SYS_DEFAULT_VIDEO_MODE 0x301

#define CONFIG_SYS_DEFAULT_VIDEO_MODE 0x211

#endif

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

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#define RES_MODE_1280x1024 5

#define RES_MODE_240x320 6

#define RES_MODES_COUNT 7

#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：

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{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：

[cpp] view plaincopy

{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：

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COBJS-$(CONFIG_VIDEO_S3C2440) += videomodes.o

COBJS-$(CONFIG_VIDEO_S3C2440) += s3c2410_fb.o

最后，修改文件board/fl2440/fl2440.c，在文件最后添加：

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/*

* 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=4602272HZ

void 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：

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#include <video_fb.h> //头文件定义处添加

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/*****************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、输出、错误都显示在LCD屏之上效果图如下：



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