S3C2440裸机------LCD_LCD控制器编程

我们通过配置LCD控制器的相关寄存器实现这三个函数

struct lcd_controller s3c2440_lcd_controller = {

.init    = s3c2440_lcd_controller_init,

.enalbe  = s3c2440_lcd_controller_enalbe,

.disable = s3c2440_lcd_controller_disable,

};

具体代码及相关寄存器注释如下：

1.s3c2440_lcd_controller.c

#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 = (double)HCLK/plcdparams->time_seq.vclk/2-1+0.5;

int bppmode = plcdparams->bpp == 8  ? 0xb :

  plcdparams->bpp == 16 ? 0xc :

  0xd;  /* 0xd: 24bpp */

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 == 24 ? (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);

}

struct lcd_controller s3c2440_lcd_controller = {

.init    = s3c2440_lcd_controller_init,

.enalbe  = s3c2440_lcd_controller_enalbe,

.disable = s3c2440_lcd_controller_disable,

};