Hi Ming,
The maximal input clock supported by the vide CSI in i.MX51 is 120 MHz.
The limit of 45 MP/sec assumes:
- 2 bus cycles per pixel; e.g. BT.656
- 35% blanking overhead.
The standard pixel clock rate for 1280x720 @ 60 fps is 75 MHz, so the CSI supports this rate with BT.1120 (10+10-bit bus; 1 bus cycle per pixel), but not with BT.656.
1280x720 @ 60 fps could be possible with BT.656 only if the blanking overhead can be reduced below ~8.5% (~120M / (1280x720x60x2) )
In case of BT1120 Any scaling operation of PSF or Interlaced image would require first converting the image to Progressive format, prior to scaling. So I’m not sure that I clearly understand your use case.
Note that our Linux or WinCE BSP software packages may not include support for some unusual cases. The answers here are related to hardware capabilities only.
"By default, camera driver for i.MX51 Windows CE BSP can not support interlaced CSI input. Please do following changes to the camera driver to support interlaced CSI input:
1) open filewince600\platform\imx51-3ds\files\platform.reg, for the registry item "[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\Camera]", field ""CameraId", change the CameraId from 0 to 4 or 5. Value 4 or 5 to CameraId means interlaced CSI input.
2) Open file wince600\platform\common\src\soc\common_fsl_v2\ipuv3\camera\pdd\sensorpdd.cpp, go to function ReadCSIInterfaceFromRegistry(), note the following segment of code: case 4: case 5: //reserved for TVin support
#if 0 //Tvin maybe interlace mode or progressive mode m_PrtclInf.mode = CSI_CCIR_PROGRESSIVE_BT656_MODE, m_PrtclInf.mode = CSI_CCIR_INTERLACE_BT656_MODE; // Set the following parameters due to the interlace or progressive mode m_PrtclInf.PreCmd; m_PrtclInf.Field0FirstBlankStartCmd; m_PrtclInf.Field0FirstBlankEndCmd; m_PrtclInf.Field0SecondBlankStartCmd; m_PrtclInf.Field0SecondBlankEndCmd; m_PrtclInf.Field0ActiveStartCmd; m_PrtclInf.Field0ActiveEndCmd; #endif m_bCsiTstMode = FALSE; break; The code segment between "#if 0" and "#endif" is reserved for interlaced mode CSI input. Please enable this code segment to enable interlaced mode support ----- that means, customer should change "#if 0" to
"#if 1" and set the value of parameters: m_PrtclInf.Field0FirstBlankStartCmd, m_PrtclInf.Field0FirstBlankEndCmd, m_PrtclInf.Field0SecondBlankStartCmd, m_PrtclInf.Field0SecondBlankEndCmd,m_PrtclInf.Field0ActiveStartCmd,m_PrtclInf.Field0ActiveEndCmd according to their camera type."
Unfortunately there is no any patch for wince with the implementaton.
Hope this helps
