来认识一下S5PV210 的VBPDE和VFPDE

在代码中有

// VIDTCON0

#define VBPDE(n)            (((n-1)&0xff)<<24)

#define VBPD(n)             (((n-1)&0xff)<<16)

#define VFPD(n)             (((n-1)&0xff)<<8)

#define VSPW(n)             (((n-1)&0xff)<<0)

// VIDTCON1

#define VFPDE(n)            (((n-1)&0xff)<<24)

#define HBPD(n)             (((n-1)&0xff)<<16)

#define HFPD(n)             (((n-1)&0xff)<<8)

#define HSPW(n)             (((n-1)&0xff)<<0)

// VIDTCON2

#define LINEVAL(n)          (((n-1)&0x7ff)<<11)

#define HOZVAL(n)           (((n-1)&0x7ff)<<0)

#ifdef CONFIG_FB_S3C_LTE480WV

.width = 480,

.height = 272,

.bpp = 16,

.freq = 60,

.timing = {

.h_fp = 2, //HFPD_Value = 2

.h_bp = 2, //HBPD_Value = 2

.h_sw = 41,//HSPW_Value = 41;

.v_fp = 2, //VFPD_Value = 2

.v_fpe = 1, 

.v_bp = 2, //VBPD_Value = 2

.v_bpe = 1,

.v_sw = 10,

},

.polarity = {

.rise_vclk = 0,

.inv_hsync = 1,

.inv_vsync = 1,

.inv_vden = 0,

},

#endif

里面的

v_fpe和h_bpe 是啥玩意呢？

在代码中有

int s3cfb_set_timing(struct s3cfb_global *ctrl)

{

struct s3cfb_lcd_timing *time;

u32 cfg;

time = &ctrl->lcd->timing;

cfg = 0;

cfg |= S3C_VIDTCON0_VBPDE(time->v_bpe - 1);

cfg |= S3C_VIDTCON0_VBPD(time->v_bp - 1);

cfg |= S3C_VIDTCON0_VFPD(time->v_fp - 1);

cfg |= S3C_VIDTCON0_VSPW(time->v_sw - 1);

writel(cfg, ctrl->regs + S3C_VIDTCON0);

cfg = 0;

cfg |= S3C_VIDTCON1_VFPDE(time->v_fpe - 1);

cfg |= S3C_VIDTCON1_HBPD(time->h_bp - 1);

cfg |= S3C_VIDTCON1_HFPD(time->h_fp - 1);

cfg |= S3C_VIDTCON1_HSPW(time->h_sw - 1);

writel(cfg, ctrl->regs + S3C_VIDTCON1);

return 0;

}

在手册有如下说明：

VBPDE  [31:24]  Vertical back porch specifies the number of inactive lines at the 

start of a frame after vertical synchronization period. (Only for even

field of YVU interface) 

VFPDE  [31:24]  Vertical front porch specifies the number of inactive lines at the end 

of a frame before vertical synchronization period. (Only for the even

field of YVU interface). 

Only for the even field of YVU interface 这个是啥意思？我在wince的VGA 1440*900 1280*720 1280*1024 当中根本没有设置这个

v_fpe和h_bpe，也就是默认就是0.在android下就有这玩意。