第十九章、TIny4412 U-BOOT移植十九 LCD移植

其实我一直就只想学一点东西，当时心太大了，就直接买了Tiny4412，才发现这是一块硬骨头，网上资料少的可怜，FriendlyARM给的资料基本就是代码，说明性、讲原理的东西也没有。看了好久才发现其给的U-BOOT是不带LCD显示功能的，我就想给这个U-BOOT增加LCD显示功能，我所有的学习过程，都是为了增加LCD功能而开展的。这一篇虽然也有参考别人成份，但绝大多数内容都是我最近这段时间分析U-BOOT后，也进行相关裸机程序后(裸机代码的实现我有一篇相关的说明文档)，有了一定的感觉，才顺利完成的。

下面依据《s5pv-u -boot-2011.06之增加LCD显示功能》的实现过程，来说明一下：我增加LCD功能的过程。

《s5pv-u-boot-2011.06之增加LCD显示功能》上说，其主要完成 U-Boot 层可以在 LCD 上显示字符，而且对于软件分层的 U-Boot 来说，只要将底层驱动移植过来并调整好初始化参数就可以在LCD上显示console。下图17-1是LCD 驱动软件分层执行流程示意。可以看到 LCD 在执行时最终调用的是底层的 board_video_init() 函数，其主要作用是对 LCD控制寄存器进行初始化。可由用户根据实际 LCD 硬件编写。

这个功能的移植修改了5 个文件。

图19-1、LCD 驱动软件分层执行流程示意

废话不多说，开始按步骤说明吧：

我用的U-Boot代码就是光盘中FriendlyARM提供的uboot_tiny4412-20130729.tgz。我的所有编辑操作都是在windows环境下，应用sourcein sight等工具进行的，最后才到linux环境下面进行编译。

第一步：增加底层头文件

复制LCD裸机程序下的字库文件，font_8x16.h，font_10x18.h，font_sun12x22.h到uboot_tiny4412-lcdinclude下，这三个字库文件是从Linux源码下提取出来的。具体说明可参看我裸机LCD程序说明文档。

接着，在uboot_tiny4412-lcdinclude目录下添加一个驱动程序所需的头文件，文件名为zth_tiny4412_lcd.h，此文件是从我的LCD裸机程序里复制过来的。zth_tiny4412_lcd.h内容如下，大家可以将其粘贴过去。

/****************************************

NAME:LCD.h

TRAD:

PROJECT:

CREATER:Zhang Taohua

DATA:2014-06-07

MAIL :zthvivid@163.com

DESCRIPTION:

 *****************************************/

#ifndef __LCD_H

#define __LCD_H

extern void lcd_init(void);

extern void lcd_draw_pixel(introw, int col, int color);

extern void lcd_clear_screen(intcolor);

extern void lcd_draw_hline(introw, int col1, int col2, int color);

extern void lcd_draw_vline(intcol, int row1, int row2, int color);

extern void lcd_draw_cross(introw, int col, int halflen, int color);

extern void led_blink(intlink_times);  

extern void delay(unsigned longcount);

extern void draw_point(int x, inty, int r, int g, int b);

//extern void memset_int(unsignedint * s, int c,unsigned int count);

extern void lcd_draw_bmp(constunsigned char gImage_bmp[]);

extern voidlcd_draw_char(unsigned char c);

#define readb(a)                   (*(volatile unsigned char*)(a))

#define readw(a)                  (*(volatile unsigned short*)(a))

#define readl(a)                    (*(volatile unsigned int*)(a))

#define writeb(v,a)        (*(volatile unsigned char *)(a) = (v))

#define writew(v,a)              (*(volatile unsigned short *)(a) =(v))

#define writel(v,a)         (*(volatile unsigned int *)(a) = (v))

//FONT

//#define FONT8_16  1

//#define FONT10_18 1

#define FONT12_22  1

#define FONT_STATIC_ROW 8

#if FONT8_16

#define FONT_ROW 8

#define FONT_COL 16

#endif

#if FONT10_18

#define FONT_ROW 10

#define FONT_COL  18

#endif

#if FONT12_22 

#define FONT_ROW 12

#define FONT_COL  22

#endif

//PICTURE

#define PICTURE_WIDTH

#define PICTURE_HEIGHT

//LCD Clock Relate Register

#define CLK_DIV_LCD (*(volatileunsigned int *)0x1003c534)

#define CLK_SRC_MASK_LCD(*(volatile unsigned int *)0x1003c334)

#define CLK_GATE_IP_LCD(*(volatile unsigned int *)0x1003c934)

#define CLK_SRC_LCD0 (*(volatileunsigned int *)0x1003c234)

//Framer Buffer Address And Size

//#define LCD_VIDEO_ADDR     (0x54000000)    

//#define        VIDEO_MEM_SIZE 0x200000        /* 800x480x24bit =0X119400 bytes */

//LED IO Control Regiester

#define GPM4CON      (*(volatile unsigned long *) 0x110002E0)

#define GPM4DAT        (*(volatile unsigned long *) 0x110002E4)

//LCD OP Control Regiester

#define GPF0CON        (*(volatile unsigned int *)0x11400180)

#define GPF0DAT         (*(volatile unsigned int *)0x11400184)

#define GPF0PUD        (*(volatile unsigned int *)0x11400188)

#define GPF0DRV        (*(volatile unsigned int *)0x1140018C)

#define GPF1CON       (*(volatile unsigned int *)0x114001a0)

#define GPF1DAT       (*(volatileunsigned int *)0x114001a4)

#define GPF1PUD        (*(volatile unsigned int *)0x114001a8)

#define GPF1DRV        (*(volatile unsigned int *)0x114001ac)

#define GPF2CON        (*(volatile unsigned int *)0x114001c0)

#define GPF2DAT       (*(volatileunsigned int *)0x114001c4)

#define GPF2PUD        (*(volatile unsigned int *)0x114001c8)

#define GPF2DRV        (*(volatile unsigned int *)0x114001cc)

#define GPF3CON       (*(volatile unsigned int *)0x114001e0)

#define GPF3DAT       (*(volatileunsigned int *)0x114001e4)

#define GPF3PUD        (*(volatile unsigned int *)0x114001e8)

#define GPF3DRV        (*(volatile unsigned int *)0x114001ec)

#define LCDBLK_CFG (*(volatileunsigned int *)0x10010210)

#define LCDBLK_CFG2 (*(volatileunsigned int *)0x10010214)

//LCD Control Register

#define LCD_BASE 0x11C00000

#define VIDCON0        (*(volatile unsigned int *)(LCD_BASE +0x0000))

#define VIDCON1        (*(volatile unsigned int *)(LCD_BASE +0x0004))

#define VIDCON2        (*(volatile unsigned int *)(LCD_BASE +0x0008))

#define VIDCON3        (*(volatile unsigned int *)(LCD_BASE +0x000C))

#define VIDTCON0      (*(volatile unsigned int *)(LCD_BASE +0x0010))

#define VIDTCON1      (*(volatile unsigned int *)(LCD_BASE +0x0014))

#define VIDTCON2      (*(volatile unsigned int *)(LCD_BASE +0x0018))

#define VIDTCON3      (*(volatile unsigned int *)(LCD_BASE +0x001C))

#define WINCON0       (*(volatile unsigned int *)(LCD_BASE +0x0020))

#define WINCON1       (*(volatile unsigned int *)(LCD_BASE +0x0024))

#define WINCON2       (*(volatile unsigned int *)(LCD_BASE +0x0028))

#define WINCON3       (*(volatile unsigned int *)(LCD_BASE + 0x002C))

#define WINCON4       (*(volatile unsigned int *)(LCD_BASE +0x0030))

#define SHADOWCON       (*(volatile unsigned int *)(LCD_BASE +0x0034))

#define WINCHMAP2 (*(volatile unsigned int *)(LCD_BASE + 0x003C))

#define VIDOSD0A      (*(volatile unsigned int *)(LCD_BASE +0x0040))

#define VIDOSD0B      (*(volatile unsigned int *)(LCD_BASE +0x0044))

#define VIDOSD0C      (*(volatile unsigned int *)(LCD_BASE +0x0048))

#define VIDOSD1A      (*(volatile unsigned int *)(LCD_BASE +0x0050))

#define VIDOSD1B      (*(volatile unsigned int *)(LCD_BASE +0x0054))

#define VIDOSD1C      (*(volatile unsigned int *)(LCD_BASE +0x0058))

#define VIDOSD1D     (*(volatile unsigned int *)(LCD_BASE +0x005C))

#define VIDOSD2A      (*(volatile unsigned int *)(LCD_BASE +0x0060))

#define VIDOSD2B      (*(volatile unsigned int *)(LCD_BASE +0x0064))

#define VIDOSD2C      (*(volatile unsigned int *)(LCD_BASE +0x0068))

#define VIDOSD2D     (*(volatile unsigned int *)(LCD_BASE +0x006C))

#define VIDOSD3A      (*(volatile unsigned int *)(LCD_BASE +0x0070))

#define VIDOSD3B      (*(volatile unsigned int *)(LCD_BASE +0x0074))

#define VIDOSD3C      (*(volatile unsigned int *)(LCD_BASE +0x0078))

#define VIDOSD4A      (*(volatile unsigned int *)(LCD_BASE +0x0080))

#define VIDOSD4B      (*(volatile unsigned int *)(LCD_BASE +0x0084))

#define VIDOSD4C      (*(volatile unsigned int *)(LCD_BASE +0x0088))

#define VIDW00ADD0B0    (*(volatile unsigned int *)(LCD_BASE +0x00A0))

#define VIDW00ADD0B1    (*(volatile unsigned int *)(LCD_BASE +0x00A4))

#define VIDW00ADD0B2    (*(volatile unsigned int *)(LCD_BASE +0x20A0))

#define VIDW01ADD0B0    (*(volatile unsigned int *)(LCD_BASE +0x00A8))

#define VIDW01ADD0B1    (*(volatile unsigned int *)(LCD_BASE +0x00AC))

#define VIDW01ADD0B2    (*(volatile unsigned int *)(LCD_BASE +0x20A8))

#define VIDW02ADD0B0    (*(volatile unsigned int *)(LCD_BASE +0x00B0))

#define VIDW02ADD0B1    (*(volatile unsigned int *)(LCD_BASE +0x00B4))

#define VIDW02ADD0B2    (*(volatile unsigned int *)(LCD_BASE +0x20B0))

#define VIDW03ADD0B0    (*(volatile unsigned int *)(LCD_BASE + 0x00B8))

#define VIDW03ADD0B1    (*(volatile unsigned int *)(LCD_BASE +0x00BC))

#define VIDW03ADD0B2    (*(volatile unsigned int *)(LCD_BASE +0x20B8))

#define VIDW04ADD0B0    (*(volatile unsigned int *)(LCD_BASE +0x00C0))

#define VIDW04ADD0B1    (*(volatile unsigned int *)(LCD_BASE +0x00C4))

#define VIDW04ADD0B2    (*(volatile unsigned int *)(LCD_BASE +0x20C0))

#define VIDW00ADD1B0    (*(volatile unsigned int *)(LCD_BASE +0x00D0))

#define VIDW00ADD1B1    (*(volatile unsigned int *)(LCD_BASE +0x00D4))

#define VIDW00ADD1B2    (*(volatile unsigned int *)(LCD_BASE +0x20D0))

#define VIDW01ADD1B0    (*(volatile unsigned int *)(LCD_BASE +0x00D8))

#define VIDW01ADD1B1    (*(volatile unsigned int *)(LCD_BASE +0x00DC))

#define VIDW01ADD1B2    (*(volatile unsigned int *)(LCD_BASE +0x20D8))