1、代码结构
2、s3c2440_lcd_controller.c //lcd控制器相关的代码，需要向lcd_controller.c管理者注册，管理者下发p_lcd_params屏的参数
#include "lcd.h"
#include "lcd_controller.h"
#include "../s3c2440_soc.h"
#define HCLK 100
void jz2440_lcd_pin_init(void)
{
/* 初始化引脚 : 背光引脚 */
GPBCON &= ~0x3;
GPBCON |= 0x01;
/* LCD专用引脚 */
GPCCON = 0xaaaaaaaa;
GPDCON = 0xaaaaaaaa;
/* PWREN */
GPGCON |= (3<<8);
}
/* 根据传入的LCD参数设置LCD控制器 */
void s3c2440_lcd_controller_init(p_lcd_params plcdparams)
{
int pixelplace;
unsigned int addr;
jz2440_lcd_pin_init();
/* [17:8]: clkval, vclk = HCLK / [(CLKVAL+1) x 2]
* 9 = 100M /[(CLKVAL+1) x 2], clkval = 4.5 = 5
* CLKVAL = 100/vclk/2-1
* [6:5]: 0b11, tft lcd
* [4:1]: bpp mode
* [0] : LCD video output and the logic enable/disable
*/
int clkval = (float)HCLK/plcdparams->time_seq.vclk/2-1+0.5;
//int clkval = 5;
int bppmode = plcdparams->bpp == 8 ? 0xb :\
plcdparams->bpp == 16 ? 0xc :\
0xd; /* 0xd: 24,32bpp */
LCDCON1 = (clkval<<8) | (3<<5) | (bppmode<<1) ;
/* [31:24] : VBPD = tvb - 1
* [23:14] : LINEVAL = line - 1
* [13:6] : VFPD = tvf - 1
* [5:0] : VSPW = tvp - 1
*/
LCDCON2 = ((plcdparams->time_seq.tvb - 1)<<24) | \
((plcdparams->yres - 1)<<14) | \
((plcdparams->time_seq.tvf - 1)<<6) | \
((plcdparams->time_seq.tvp - 1)<<0);
/* [25:19] : HBPD = thb - 1
* [18:8] : HOZVAL = 列 - 1
* [7:0] : HFPD = thf - 1
*/
LCDCON3 = ((plcdparams->time_seq.thb - 1)<<19) | \
((plcdparams->xres - 1)<<8) | \
((plcdparams->time_seq.thf - 1)<<0);
/*
* [7:0] : HSPW = thp - 1
*/
LCDCON4 = ((plcdparams->time_seq.thp - 1)<<0);
/* 用来设置引脚极性, 设置16bpp, 设置内存中象素存放的格式
* [12] : BPP24BL
* [11] : FRM565, 1-565
* [10] : INVVCLK, 0 = The video data is fetched at VCLK falling edge
* [9] : HSYNC是否反转
* [8] : VSYNC是否反转
* [7] : INVVD, rgb是否反转
* [6] : INVVDEN
* [5] : INVPWREN
* [4] : INVLEND
* [3] : PWREN, LCD_PWREN output signal enable/disable
* [2] : ENLEND
* [1] : BSWP
* [0] : HWSWP
*/
pixelplace = plcdparams->bpp == 32 ? (0) : \
plcdparams->bpp == 16 ? (1) : \
(1<<1); /* 8bpp */
LCDCON5 = (plcdparams->pins_pol.vclk<<10) |\
(plcdparams->pins_pol.rgb<<7) |\
(plcdparams->pins_pol.hsync<<9) |\
(plcdparams->pins_pol.vsync<<8) |\
(plcdparams->pins_pol.de<<6) |\
(plcdparams->pins_pol.pwren<<5) |\
(1<<11) | pixelplace;
/* framebuffer地址 */
/*
* [29:21] : LCDBANK, A[30:22] of fb
* [20:0] : LCDBASEU, A[21:1] of fb
*/
addr = plcdparams->fb_base & ~(1<<31);
LCDSADDR1 = (addr >> 1);
/*
* [20:0] : LCDBASEL, A[21:1] of end addr
*/
addr = plcdparams->fb_base + plcdparams->xres*plcdparams->yres*plcdparams->bpp/8;
addr >>=1;
addr &= 0x1fffff;
LCDSADDR2 = addr;//
}
void s3c2440_lcd_controller_enalbe(void)
{
/* 背光引脚 : GPB0 */
GPBDAT |= (1<<0);
/* pwren : 给LCD提供AVDD */
LCDCON5 |= (1<<3);
/* LCDCON1'BIT 0 : 设置LCD控制器是否输出信号 */
LCDCON1 |= (1<<0);
}
void s3c2440_lcd_controller_disable(void)
{
/* 背光引脚 : GPB0 */
GPBDAT &= ~(1<<0);
/* pwren : 给LCD提供AVDD */
LCDCON5 &= ~(1<<3);
/* LCDCON1'BIT 0 : 设置LCD控制器是否输出信号 */
LCDCON1 &= ~(1<<0);
}
/* 设置调色板之前, 先关闭lcd_controller */
void s3c2440_lcd_controller_init_palette(void)
{
volatile unsigned int *palette_base = (volatile unsigned int *)0x4D000400;
int i;
int bit = LCDCON1 & (1<<0);
/* LCDCON1'BIT 0 : 设置LCD控制器是否输出信号 */
if (bit)
LCDCON1 &= ~(1<<0);
for (i = 0; i < 256; i++)
{
/* 低16位 : rgb565 */
*palette_base++ = i;
}
if (bit)
LCDCON1 |= (1<<0);
}
struct lcd_controller s3c2440_lcd_controller = {
.name = "s3c2440",
.init = s3c2440_lcd_controller_init,
.enable = s3c2440_lcd_controller_enalbe,
.disable = s3c2440_lcd_controller_disable,
.init_palette = s3c2440_lcd_controller_init_palette,
};
void s3c2440_lcd_contoller_add(void)
{
register_lcd_controller(&s3c2440_lcd_controller);
}
3、lcd_controller.c 控制器管理者，提供下面控制器注册接口，封装控制器这一层，向lcd.c来提供一些接口使用它
#include "lcd_controller.h"
#define LCD_CONTROLLER_NUM 10
static p_lcd_controller p_array_lcd_controller[LCD_CONTROLLER_NUM];
static p_lcd_controller g_p_lcd_controller_selected;
int register_lcd_controller(p_lcd_controller plcdcon)
{
int i;
for (i = 0; i < LCD_CONTROLLER_NUM; i++)
{
if (!p_array_lcd_controller[i])
{
p_array_lcd_controller[i] = plcdcon;
return i;
}
}
return -1;
}
int select_lcd_controller(char *name)
{
int i;
for (i = 0; i < LCD_CONTROLLER_NUM; i++)
{
if (p_array_lcd_controller[i] && !strcmp(p_array_lcd_controller[i]->name, name))
{
g_p_lcd_controller_selected = p_array_lcd_controller[i];
return i;
}
}
return -1;
}
/* 向上: 接收不同LCD的参数
* 向下: 使用这些参数设置对应的LCD控制器
*/
int lcd_controller_init(p_lcd_params plcdparams)
{
/* 调用所选择的LCD控制器的初始化函数 */
if (g_p_lcd_controller_selected)
{
g_p_lcd_controller_selected->init(plcdparams);
g_p_lcd_controller_selected->init_palette();
return 0;
}
return -1;
}
void lcd_controller_enable(void)
{
if (g_p_lcd_controller_selected)
{
g_p_lcd_controller_selected->enable();
}
}
void lcd_controller_disable(void)
{
if (g_p_lcd_controller_selected)
{
g_p_lcd_controller_selected->disable();
}
}
void lcd_contoller_add(void)
{
s3c2440_lcd_contoller_add();
}
4、lcd_4.3.c 各个屏的屏参数设置，向lcd.c注册。
#include "lcd.h"
#define LCD_FB_BASE 0x33c00000
lcd_params lcd_4_3_params = {
.name = "lcd_4.3",
.pins_pol = {
.de = NORMAL, /* normal: 高电平时可以传输数据 */
.pwren = NORMAL, /* normal: 高电平有效 */
.vclk = NORMAL, /* normal: 在下降沿获取数据 */
.rgb = NORMAL, /* normal: 高电平表示1 */
.hsync = INVERT, /* normal: 高脉冲 */
.vsync = INVERT, /* normal: 高脉冲 */
},
.time_seq = {
/* 垂直方向 */
.tvp= 10, /* vysnc脉冲宽度 */
.tvb= 2, /* 上边黑框, Vertical Back porch */
.tvf= 2, /* 下边黑框, Vertical Front porch */
/* 水平方向 */
.thp= 41, /* hsync脉冲宽度 */
.thb= 2, /* 左边黑框, Horizontal Back porch */
.thf= 2, /* 右边黑框, Horizontal Front porch */
.vclk= 9, /* MHz */
},
.xres = 480,
.yres = 272,
.bpp = 8, /* 16, no 24bpp */
.fb_base = LCD_FB_BASE,
};
void lcd_4_3_add(void)
{
register_lcd(&lcd_4_3_params);
}
5、lcd.c 提供下面lcd_4_3显示屏的注册接口，还有和控制器管理者去申请资源
#include "lcd.h"
#include "lcd_controller.h"
#define LCD_NUM 10
static p_lcd_params p_array_lcd[LCD_NUM];
static p_lcd_params g_p_lcd_selected;
int register_lcd(p_lcd_params plcd)
{
int i;
for (i = 0; i < LCD_NUM; i++)
{
if (!p_array_lcd[i])
{
p_array_lcd[i] = plcd;
return i;
}
}
return -1;
}
int select_lcd(char *name)
{
int i;
for (i = 0; i < LCD_NUM; i++)
{
if (p_array_lcd[i] && !strcmp(p_array_lcd[i]->name, name))
{
g_p_lcd_selected = p_array_lcd[i];
return i;
}
}
return -1;
}
void get_lcd_params(unsigned int *fb_base, int *xres, int *yres, int *bpp)
{
*fb_base = g_p_lcd_selected->fb_base;
*xres = g_p_lcd_selected->xres;
*yres = g_p_lcd_selected->yres;
*bpp = g_p_lcd_selected->bpp;
}
void lcd_enable(void)
{
lcd_controller_enable();
}
void lcd_disable(void)
{
lcd_controller_disable();
}
int lcd_init(void)
{
/* 注册LCD */
lcd_4_3_add();
/* 注册LCD控制器 */
lcd_contoller_add();
/* 选择某款LCD */
select_lcd("lcd_4.3");
/* 选择某款LCD控制器 */
select_lcd_controller("s3c2440");
/* 使用LCD的参数, 初始化LCD控制器 */
lcd_controller_init(g_p_lcd_selected);
}
6、lcd_controller.h 在s3c2440_lcd_controller.c去实现这些接口再向lcd_controller.c注册
#ifndef _LCD_CONTROLLER_H
#define _LCD_CONTROLLER_H
#include "lcd.h"
typedef struct lcd_controller {
char *name;
void (*init)(p_lcd_params plcdparams);
void (*enable)(void);
void (*disable)(void);
void (*init_palette)(void);
}lcd_controller, *p_lcd_controller;
#endif /* _LCD_CONTROLLER_H */
7、lcd.h 在lcd_4.3.c中实现如下结构体，向lcd.c注册
#ifndef _LCD_H
#define _LCD_H
enum {
NORMAL = 0,
INVERT = 1,
};
/* NORMAL : 正常极性
* INVERT : 反转极性
*/
typedef struct pins_polarity {
int de; /* normal: 高电平时可以传输数据 */
int pwren; /* normal: 高电平有效 */
int vclk; /* normal: 在下降沿获取数据 */
int rgb; /* normal: 高电平表示1 */
int hsync; /* normal: 高脉冲 */
int vsync; /* normal: 高脉冲 */
}pins_polarity, *p_pins_polarity;
typedef struct time_sequence {
/* 垂直方向 */
int tvp; /* vysnc脉冲宽度 */
int tvb; /* 上边黑框, Vertical Back porch */
int tvf; /* 下边黑框, Vertical Front porch */
/* 水平方向 */
int thp; /* hsync脉冲宽度 */
int thb; /* 左边黑框, Horizontal Back porch */
int thf; /* 右边黑框, Horizontal Front porch */
int vclk;
}time_sequence, *p_time_sequence;
typedef struct lcd_params {
char *name;
/* 引脚极性 */
pins_polarity pins_pol;
/* 时序 */
time_sequence time_seq;
/* 分辨率, bpp */
int xres;
int yres;
int bpp;
/* framebuffer的地址 */
unsigned int fb_base;
}lcd_params, *p_lcd_params;
void get_lcd_params(unsigned int *fb_base, int *xres, int *yres, int *bpp);
#endif /* _LCD_H */