OV2643规格书开发代码详情HS[15:8]=0x20HS[7:0]=0x21verticalstart[0x22,0x23]VS[15:8]=0x22VS[7:0]=0x23horizontalwidth[0x24,0x25]HW[11:4]=0x24HW[3:0]=0x25[7:4]HPAD[3:0]=0x25[3:0]x2verticalheight[0x26,0x27]VH[11:4]=0x26VH[3:0]=0x27[7:4]VPAD[3:0]=0x27[3:0