半夜来认识一下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。明天再看怎么回事，今天太晚了。