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TVP5150AM1: Register / RAM initialization

Part Number: TVP5150AM1


I have been trying to get a TVP5150AM1 to output closed captioning data. I have followed the VBI quickstart guide almost exactly, and I have monitored the I2C lines with an analyzer. However, reading the closed captioning registers output only 0x00. Does anybody have example initialization/closed captioning code for the TVP5150AM1?