Function rt_dc_init

bsp/loongson/ls1cdev/drivers/display_controller.c:114–173

}

static rt_err_t rt_dc_init(rt_device_t dev)
{
    int i, out, mode=-1;
    int val;

    rt_kprintf("PWM initied\n");
    /* Set the back light PWM. */
    pwminit();

    for (i=0; i<sizeof(vga_mode)/sizeof(struct vga_struct); i++)
    {
        if (vga_mode[i].hr == FB_XSIZE && vga_mode[i].vr == FB_YSIZE)
        {
            mode=i;
            /* 计算时钟 配置频率*/
            caclulate_freq(OSC, vga_mode[i].pclk);
            break;
        }
    }

    if (mode<0)
    {
        rt_kprintf("\n\n\nunsupported framebuffer resolution\n\n\n");
        return -RT_ERROR;
    }

    DC_FB_CONFIG = 0x0;
    DC_FB_CONFIG = 0x3; //    // framebuffer configuration RGB565
    DC_DITHER_CONFIG = 0x0;  //颜色抖动配置寄存器
    DC_DITHER_TABLE_LOW = 0x0; //颜色抖动查找表低位寄存器
    DC_DITHER_TABLE_HIGH = 0x0; //颜色抖动查找表高位寄存器
    DC_PANEL_CONFIG = 0x80001311; //液晶面板配置寄存器
    DC_PANEL_TIMING = 0x0;

    DC_HDISPLAY = (vga_mode[mode].hfl<<16) | vga_mode[mode].hr;
    DC_HSYNC = 0x40000000 | (vga_mode[mode].hse<<16) | vga_mode[mode].hss;
    DC_VDISPLAY = (vga_mode[mode].vfl<<16) | vga_mode[mode].vr;
    DC_VSYNC = 0x40000000 | (vga_mode[mode].vse<<16) | vga_mode[mode].vss;

#if defined(CONFIG_VIDEO_32BPP)
    DC_FB_CONFIG = 0x00100105;
    DC_FB_BUFFER_STRIDE = FB_XSIZE*4;
#elif defined(CONFIG_VIDEO_24BPP)
    DC_FB_CONFIG = 0x00100104;
    DC_FB_BUFFER_STRIDE = (FB_XSIZE*4+255)&(~255);
#elif defined(CONFIG_VIDEO_16BPP)// 使用这个选项
    DC_FB_CONFIG = 0x00100103;
    DC_FB_BUFFER_STRIDE = (FB_XSIZE*2+0x7f)&(~0x7f);
#elif defined(CONFIG_VIDEO_15BPP)
    DC_FB_CONFIG = 0x00100102;
    DC_FB_BUFFER_STRIDE =  (FB_XSIZE*2+255)&(~255);
#elif defined(CONFIG_VIDEO_12BPP)
    DC_FB_CONFIG = 0x00100101;
    DC_FB_BUFFER_STRIDE =  (FB_XSIZE*2+255)&(~255);
#else
    DC_FB_CONFIG = 0x00100104;
    DC_FB_BUFFER_STRIDE = (FB_XSIZE*4+255)&(~255);
#endif