ADV7842 CVBS to RGB Out

Hi,

 Have you tried Table 36 on Page107 of 0552.ADV7441A_HW_RevJ.pdf ? These CSC coefficients should work fine for CVBS to RGB conversation.

ADV7842 is basically a serial to parallel converter(even for analog input), what comes in goes out.
Have you tried with other sources ?

Gray noise may caused due to the processor side also.Have you verified output at ADV7842 before it passing to the processor ?

Thanks,

Poornima

Yes I tried with table 36 and got this:

CSC Mode = 0001:

CSC Mode = 0011

No, I didn't tested with other source, but I have a ADV7280 on same board with CVBS input too, and the camera works fine on it, but it convert from CVBS to CSI directly

The video patch is ADV7842 -> TFP410 -> ADV7482 -> Jetson TX2, I can put colorbars on 7482 and it's ok on Jetson, then I put full color screen on ADV7842 (it don't have colorbar at HD or fullHD resolution) and it's ok (I changed the R, G and B values by hand and colors are ok on screen).

Hi,

 Pink usually means when color space is wrong.

 Just turn off the color space. Lets check how the result would be.

Thanks,

Poornima

Do you mean turn-off the color space conversion?

Hi,

  Yes, turn off the color space conversation. This configuration is enough - 0x20 0x02 0xF2 #RGB color space out.

  Above configuration was RGB full range,

  Readback the HDMI map(Addr 68), 0x53 - 0x00 for RGB limited and for full range the register will read 0x01, according to that set your input source . This register - 0x53( Readback of the HDMI input color space decoded from several fields in the AVI InfoFrame) is available to check whether RGB limited or full range coming from the source.

Thanks,

Poornima

Hi,

I turned off the csc and tested all values to 0x02 (INP_COLOR_SPACE) register from 0 to 7, with the same results:

tThe register 0x53 from HDMI returns 0x00 but the input is CVBS, HDMI block can do something in this configuration?

Hi,

 Please try to change the CSC setting as auto and check automatic CSC for the SDP path.
 SDP_CSC_AUTO to 0 for manual and 1 for automatic.

Thanks,

Poornima

It's already turned off, if I turn it on the image goes to a almost dark image with some pink spots.

Hi,

 As i already stated 'ADV7842 is an basically a serial to parallel converter(even for analog input), what comes in goes out".
Is it possible you to check the output of ADV7842 ? To confirm whether the problem is from either ADV7842 or Processor side.

Thanks,

Poornima

Hi,

I have two of these ADV7842 on my board, with the same chain (ADV7842 -> isolation -> TFP410 -> ADV7482 -> TX2) these IC are u43 and u53.

The diference is the input:

U43 has DVI and CVBS inputs conected

U53 has DVI and VGA inputs conected

On u53 I can get a XGA input through vga port with correct colors.

Now I'm trying to get CVBS input working on u43, but I'm getting the problems above...

Trying to test if all is correct on chain after ADV7842's ic's I generate colorbars on both u43 and u53, but the result are different:

Left = u43

Right = u53

The script I used is the "best" I have until now:

sudo i2cset -y 8 0x20 0xff 0xff #full reset
sudo i2cset -y 8 0x20 0xf1 0x90 #SDP map
sudo i2cset -y 8 0x20 0xf2 0x94 #SDPIO map
sudo i2cset -y 8 0x20 0xf3 0x84 #AVLINK
sudo i2cset -y 8 0x20 0xf4 0x80 #CEC
sudo i2cset -y 8 0x20 0xf5 0x7c #INFOFRAME
sudo i2cset -y 8 0x20 0xf8 0x4c #AFE
sudo i2cset -y 8 0x20 0xf9 0x64 #KSV
sudo i2cset -y 8 0x20 0xfa 0x6c #EDID
sudo i2cset -y 8 0x20 0xfb 0x68 #HDMI
sudo i2cset -y 8 0x20 0xfd 0x44 #CP
sudo i2cset -y 8 0x20 0xfe 0x48 #VDP
sudo i2cset -y 8 0x20 0x00 0x01 #VID_STD = SD 4x1 720x480i/576i CVBS
sudo i2cset -y 8 0x20 0x01 0x00 #V_FREQ = 60Hz, PRIM_MODE = SDP Mode
#sudo i2cset -y 8 0x20 0x02 0xF2 #RGB color space output
sudo i2cset -y 8 0x20 0x03 0x4c #24-bit SDR 4:4:4 mode 3 out
sudo i2cset -y 8 0x20 0x04 0x62 #op_ch_sel = 3
sudo i2cset -y 8 0x20 0x0c 0x40 #power up all blocks
sudo i2cset -y 8 0x20 0x15 0x90 #power up pads, Audio out = tristate
sudo i2cset -y 8 0x20 0x19 0xC3 #LLC_DLL_EN = 1 LLC_DLL_DOUBLE = 1 DLL_PHASE = 0x03
sudo i2cset -y 8 0x20 0x33 0x40 #LLC_DLL_MUX = 1
#sudo i2cset -y 8 0x20 0xde 0x90 #Manual 27Mhz output clock (undocumented)
sudo i2cset -y 8 0x26 0x0c 0x1f #ADI recommended write
sudo i2cset -y 8 0x26 0x12 0x63 #ADI recommended write
sudo i2cset -y 8 0x26 0x00 0x0e #ADC0 power Up
sudo i2cset -y 8 0x26 0x02 0x80 #Manual Mux
sudo i2cset -y 8 0x26 0x03 0xb0 #Ain11
sudo i2cset -y 8 0x4a 0x7a 0xa5 #Timing Adjustment 
sudo i2cset -y 8 0x4a 0x7b 0x8f #Timing Adjustment
sudo i2cset -y 8 0x4a 0x60 0x01 #SDRAM reset
sudo i2cset -y 8 0x4a 0x97 0x00 #Hsync width Adjustment Adjustment
sudo i2cset -y 8 0x4a 0xb2 0x60 #Disable AV codes
sudo i2cset -y 8 0x48 0x00 0x7f #Autodetect PAL NTSC SECAM
sudo i2cset -y 8 0x48 0x01 0x00 #Pedestal Off
sudo i2cset -y 8 0x48 0x03 0xe4 #Manual VCR Gain Luma 0x40B
sudo i2cset -y 8 0x48 0x04 0x0b #Manual Luma setting
sudo i2cset -y 8 0x48 0x05 0xc3 #Manual Chroma setting 0x3FE
sudo i2cset -y 8 0x48 0x06 0xfe #Manual Chroma setting
sudo i2cset -y 8 0x48 0x12 0x09 #enable I2P, disable TBC, enable 3D comb.
sudo i2cset -y 8 0x48 0xa7 0x00 #ADI Recommended Write
#colorspace conversion NTSC to RGB:
sudo i2cset -y 8 0x4A 0xB0 0x00 # Disable H and v blanking
sudo i2cset -y 8 0x4A 0xE0 0x83 # Manual CSC mode CSC scaler = 2 A1[12:8]
sudo i2cset -y 8 0x4A 0xE1 0xA7 # CSC coeff A1[7:0]
sudo i2cset -y 8 0x4A 0xE2 0x1E # CSC coeff A2[12:8]
sudo i2cset -y 8 0x4A 0xE3 0x91 # CSC coeff A2[7:0]
sudo i2cset -y 8 0x4A 0xE4 0x1D # CSC coeff A3[12:8]
sudo i2cset -y 8 0x4A 0xE5 0xE2 # CSC coeff A3[7:0]
sudo i2cset -y 8 0x4A 0xE6 0x7D # CSC coeff A4[14:8]
sudo i2cset -y 8 0x4A 0xE7 0x00 # CSC coeff A4[7:0]
sudo i2cset -y 8 0x4A 0xE8 0x03 # CSC coeff B1[12:8]
sudo i2cset -y 8 0x4A 0xE9 0xA7 # CSC coeff B1[7:0]
sudo i2cset -y 8 0x4A 0xEA 0x07 # CSC coeff B2[12:8]
sudo i2cset -y 8 0x4A 0xEB 0x61 # CSC coeff B2[7:0]
sudo i2cset -y 8 0x4A 0xEC 0x00 # CSC coeff B3[12:8]
sudo i2cset -y 8 0x4A 0xED 0x00 # CSC coeff B3[7:0]
sudo i2cset -y 8 0x4A 0xEE 0x79 # CSC coeff B4[14:8]
sudo i2cset -y 8 0x4A 0xEF 0x00 # CSC coeff B4[7:0]
sudo i2cset -y 8 0x4A 0xF0 0x03 # CSC coeff C1[12:8]
sudo i2cset -y 8 0x4A 0xF1 0xA7 # CSC coeff C1[7:0]
sudo i2cset -y 8 0x4A 0xF2 0x00 # CSC coeff C2[12:8]
sudo i2cset -y 8 0x4A 0xF3 0x00 # CSC coeff C2[7:0]
sudo i2cset -y 8 0x4A 0xF4 0x04 # CSC coeff C3[12:8]
sudo i2cset -y 8 0x4A 0xF5 0x29 # CSC coeff C3[7:0]
sudo i2cset -y 8 0x4A 0xF6 0x79 # CSC coeff C4[14:8]
sudo i2cset -y 8 0x4A 0xF7 0x00 # CSC coeff C4[7:0]

And to change it to color bars:

sudo i2cset -y 8 0x48 0xDD 0XBF

Now, if I change the CSC values or turn it on or off it has no effect on color bars.

My questions are:

1 - Do you know if the color bars are generated after CSC?

2 - How can I know if the ADV7842 is generating color-bar output in RGB 4:4:4 with 8 bit per color?

Thanks

Hi,

 Are you sure, you giving the CVBS input to AIN pin ? Analog input pin can be provided only through AIN pins.

 Your schematic connection seems AIN pin got disconnected at https://ez.analog.com/video/f/q-a/167725/adv7842-wrong-colors-on-hdmi-input

Thanks,

Poornima