Hi GuenterL,
1. I have made chances in code.
2. NO other device on I2C bus.
3. SCL frequency is 94.33 KHz as shown in waveform attached.
See the I2C waveforms in attachment. For register id 0x17,0x31,0x3D,3F,0x55 which are having LSB=1, ADV7180 not giving ACK.
code files also attached. please tell what is going wrong?