4412裸机程序之lcd

下面代码是在x4412板子上做的，Tiny4412最新板子背光打不开。


#include "regs.h"

#define RGB888(r, g, b)  (((r) << 16) | ((g) << 8) | (b) )
void clean_screen(unsigned long *fb, int w, int h)
{
    // green
    int i, j;
    for (i = 0; i < h; i ++) {
        for (j = 0; j < w; j ++) {
            fb[i * w + j] = RGB888(0, 255, 0);
        }       
    }
    // blue
    for (i = 200; i < h-200; i ++) {
        for (j = 200; j < w-300; j ++) {
            fb[i * w + j] = RGB888(0, 0, 255);
        }       
    }
}

void lcd_init(unsigned long fb)
{

    //Blacklight
    GPD0CON  &= ~(0xf<<0);
    GPD0CON  |=  (0x1<<0);

    GPD0PUD  &= ~(0x3<<0);
    GPD0PUD  |=  (0x2<<0);

    GPD0DAT  &= ~(0x1<<0);
    GPD0DAT  |=  (0x0<<0);
//Blacklight
    GPX3CON  &= ~(0xf<<20);
    GPX3CON  |=  (0x1<<20);

    GPX3PUD  &= ~(0x3<<10);
    GPX3PUD  |=  (0x2<<10);

    GPX3DAT  &= ~(0x1<<5);
    GPX3DAT  |=  (0x1<<5);
    /*
     *
     *
     * GPF0CON : [31:0] : 0x2
     * GPF1CON : [31:0] : 0x2
     * GPF2CON : [31:0] : 0x2
     * GPF3CON : [31:0] : 0x2
     * */
    GPF0CON = 0x22222222;
    GPF1CON = 0x22222222;
    GPF2CON = 0x22222222;
    GPF3CON &= ~(0xffff);
    GPF3CON |= 0x2222;
   
    /*
     *
     *CLK_DIV_LCD:
     *          [3:0]:FIMD0_RATIO   0
     *              SCLK_FIMD0 = MOUTFIMD0/(FIMD0_RATIO + 1)
     *                         = MOUTFIMD0/1 = 800MHz
     *              MOUTFIMD0 == SCLKmpll_user_t == 800MHz      LCD0_BLK
     * */
    CLK_DIV_LCD &= ~0xf;
    /*
     *
     *CLK_SRC_LCD0:
     *          [3:0]:FIMD0_SEL 0110 ===> SCLKmpll_user_t 选择时钟源为SCLKmpll_user_t
     *
     * */
    CLK_SRC_LCD0 &= ~0xf;
    CLK_SRC_LCD0 |= 6;
    //LCD0_SYS_PWR_REG == 7 Don't use
   
   
    /*
     *Using the display controller data, you can select one of the above data paths by setting LCDBLK_CFG Register
     *(0x1001_0210). For more information, refer to the "System Others" manual.
     *
     *
     *
     * LCDBLK_CFG:
     *          [1] : FIMD of LBLK0 Bypass Selection    1 : FIMD Bypass   使用FIMD接口
     *
     * LCDBLK_CFG :
     *          [0]:MIE0_DISPON     1 :  PWM outpupt enable
     *
     *
     * */
    LCDBLK_CFG |= 1 << 1;
    LCDBLK_CFG2 |= 1;

    /*
     *
     *VIDCON0:
     *     [13:6]: CLKVAL_F     //设置lcd时钟分频系数
     *
     *  VCLK == 33.3Mhz         DCLK  Frequency ===> Type : 33.3Mhz
     *  VCLK = FIMD * SCLK/(CLKVAL+1)
     *  VCLK =  800000000 / (CLKVAL + 1)  
     *  33300000 = 800000000 /(CLKVAL + 1)
     *  CLKVAL + 1 = 24.02
     *  CLKVAL = 23
     * */
    VIDCON0 = (23 << 6);

    /*
     *
     *VIDTCON1:
     *      [5]:IVSYNC  ===> 1 : Inverted(反转)
     *      [6]:IHSYNC  ===> 1 : Inverted(反转)
     *      [7]:IVCLK   ===> 1 : Fetches video data at VCLK rising edge (下降沿触发)
     *      [10:9]:FIXVCLK  ====> 01 : VCLK running
     * */
    VIDCON1 = (1 << 9) | (1 << 7) | (1 << 5) | (1 << 6);

    /*
     *
     *VIDTCON0:
     *       [23:16]:  VBPD + 1 <------> tvpw (1 - 20)  13
     *       [15:8]: VFPD + 1 <------> tvfp 22
     *       [7:0]: VSPW  + 1 <------> tvb - tvpw = 23 - 13 = 10
     * */
    VIDTCON0 = (12 << 16) | (21 << 8) | (9);
     /*
     *VIDTCON1:
     *       [23:16]:  HBPD + 1 <------> thpw (1 - 40)  36
     *       [15:8]:   HFPD + 1 <------> thfp 210
     *       [7:0]:    HSPW  + 1 <------> thb - thpw = 46 - 36 = 10
     */
    VIDTCON1 = (35 << 16) | (209 << 8) | (9);

    /*
     *
     *
     *HOZVAL = (Horizontal display size) – 1 and LINEVAL = (Vertical display size) – 1.
     * Horizontal(水平) display size : 800
     *Vertical(垂直) display size : 480
     * */
    VIDTCON2 = (599 << 11) | 1023;

    //win0
#ifdef BPP565
    /*
     *
     *WINCON0:
     *  [16]:Specifies Half-Word swap control bit.  1 = Enables swap
     *  [5:2]: Selects Bits Per Pixel (BPP) mode for Window image : 0101 ===> 16BPP
     *  [1]:Enables/disables video output   1 = Enables
     *
     * */
    WINCON0 = (1 << 16) | (5 << 2) | 1;

    /*
     *
     *VIDOSD0C:Specifies the Window Size (窗口尺寸 单位为word)
     *         
     *
     * */
    VIDOSD0C = 600 * 1024 >> 1;
#else
    /*
     *
     *WINCON0:
     *  [5:2]: Selects Bits Per Pixel (BPP) mode for Window image : 1011 ===> 24BPP
     *  [1]:Enables/disables video output   1 = Enables
     *
     * */
    WINCON0 = (11 << 2) | 1;

    /*
     *
     *VIDOSD0C:Specifies the Window Size (窗口尺寸 单位为word)
     *         
     *
     * */
    VIDOSD0C = 600 * 1024;
#endif

    //SHADOWCON &= ~(1 << 5); Don't use

    /*
     *
     *[0]: Enables Channel 0. 1 = Enables
     * */
    SHADOWCON |= 1;


    /*
     *
     *[18:16] Selects Channel 0's channel. ===> 001 = Window 0
     *[2:0] Selects Window 0's channel.  ===> 001 = Channel 0
     *
     *
     * */
    WINCHMAP2 &= ~(7 << 16);
    WINCHMAP2 |= 1 << 16;
    WINCHMAP2 &= ~7;
    WINCHMAP2 |= 1;

    /*
     *
     *VIDOSD0A: LCD左上角坐标
     *VIDOSD0B: LCD右下角坐标
     */

    VIDOSD0A = 0;
    VIDOSD0B = (1023 << 11) | 599;

    /*
     *
     * VIDW00ADD0B0 : window0 frame buffer 起始地址
     *  VIDW00ADD1B0 : window0 frame buffer 结束地址
     * */
    VIDW00ADD0B0 = fb;
    VIDW00ADD1B0 = fb + 1024 * 600 * 4;
        VIDW00ADD2  = 1024;

    /*
     *
     * Display On: ENVID and ENVID_F are set to "1".
     *  [0]:ENVID ===> 1 = Enables
     *  [1]:ENVID_F ===> 1 = Enables
     * */
    VIDCON0 |= 3;   
}

int main()
{
    unsigned long fb = 0x53000000;

    clean_screen(fb, 1024, 600);

        lcd_init(fb);
       
   
}


https://github.com/cyj1988jyc/luoji4412/tree/master/ddrlcd