I am tryring to read the closed caption data through I2C on ADV7842 chip.
Here is the script I have used
I assume there is no need to have extra setting and I should be able to read some values from I2C registers,
Function I2C address Register
write 0x48 (VDP) 0x78 =1 to refresh the CCAP status register
Read 0x48 (VDP) 0x40[0,1] CC data detection
Read 0x48 (VDP) 0x41,0x42 decoded CC data
but I don't read back 0x00 all the time
I was looking in to the register setting and it looks that there is no VBI_DATA_STD[3:0] as I wanted to check and see if that is set correctly instead I saw there is VDP_Fast_VBI_STD[3:0] which has the same functionality for fast I2C.
So I wonder if I don't want to use fast I2C is there anyway to read CC data, if not what is the setting to enable the fast I2C.