Hi all,
I’m developing video application on EVM-DM6437 and I connected my video input using coaxial cable.(analog input) Also I configured tvp5146,VPFE and VPBE on the proper way(find below config. parameters). I understand that data input has following format: Y[8]Cb[8]Y[8]Cr[8]……….. and because I need grayscale picture I’m processing just Y[8] data. It works ok and I’m able to process and display video data. Problem is that I need to detect very dark environment (Night mode) and I’m expecting to get very low values (near to zero) on input but if I check input buffer there are very high values(Y[8] = 0x10). Even if I disconnect camera I’m not able to get values near to zero. (See below buffer content)
0x802C1B80 10801080 10801080
0x802C1B88 10801080 10801080
0x802C1B90 10801080 10801080
…
I don’t use previewer but I know it is able to check for “Down Sampling and Output Clipping” so I checked SETUP_YC but it has default value (0xff00ff00).
Any idea what’s going on and what I did wrong?
static PSP_VPFE_TVP5146_ConfigParams tvp5146Params =
{
TRUE, /* enable656Sync */
PSP_VPFE_TVP5146_FORMAT_COMPOSITE, /* format */
PSP_VPFE_TVP5146_MODE_AUTO /* mode */
};
static PSP_VPFECcdcConfigParams vpfeCcdcConfigParams = {
PSP_VPFE_CCDC_YCBCR_8, /* dataFlow */
PSP_VPSS_FRAME_MODE, /* ffMode */
NO_OF_IMAGER_ROWS, /* height */
NO_OF_IMAGER_COLS, /* width */
(NO_OF_IMAGER_COLS *2), /* pitch */
0, /* horzStartPix */
0, /* vertStartPix */
NULL, /* appCallback */
{
PSP_VPFE_TVP5146_Open, /* extVD Fxn */
PSP_VPFE_TVP5146_Close,
PSP_VPFE_TVP5146_Control,
},
0 /*segId */
};
static PSP_VPBEOsdConfigParams vpbeOsdConfigParams = {
PSP_VPSS_FRAME_MODE, /* ffmode */
PSP_VPSS_BITS16, /* bitsPerPixel */
PSP_VPBE_YCbCr422, /* colorFormat */
(NO_OF_ROI_COLS * (16/8u)), /* pitch */
0, /* leftMargin */
0, /* topMargin */
NO_OF_ROI_COLS, /* width */
NO_OF_ROI_ROWS, /* height */
0, /* segId */
PSP_VPBE_ZOOM_IDENTITY, /* hScaling */
PSP_VPBE_ZOOM_IDENTITY, /* vScaling */
PSP_VPBE_EXP_IDENTITY, /* hExpansion */
PSP_VPBE_EXP_IDENTITY, /* vExpansion */
NULL /* appCallback */
};
