Found reason.

Data must be sent within single conversion. If ADC conversion ends during SPI burst read, result is updated and you get half of last conversion and half of new. CRC does not match in this case. No way.

I was sure that within single burst…

Thank you ghoover

I have reversed the string and the ref voltages are there. Still the readouts make no sense and dont change when Ch0 is tied toi GND nor to REFCOMP. Below is the code and an oscilloscope screenshot, any suggestions?

while True:

#antwort…

Hi Guru,

Since my last post, I solved my problem, and it was not due to the TXPCKRDY not set (I checked that before in the code), but to the "|=" operation that, now I know, must NOT be used on the TXCSR register (if one wants to do things safely).…

We haved moved this into the clock and timing forum as it concerns a device that we classify aas a clocking device

Power supply is absolutely clean,3 AA batteries, a 100uF electrolytic, and a 100nF ceramic. I still see ~500 kHz on the unfiltered XOUT.

Hi Lars,

I do not have any logic analyzer on I2C bus.

I did the following as per your guidance:

# cd /sys/kernel/debug/regmap/2-0038

# amixer sset "DAC Playback Mux" AIFIN

Simple mixer control 'DAC Playback Mux',0

  Capabilities…

Hi,

  I don't think we have filter on I2C pins SCLK and SDATA. But ADV7182 part itself you have an antialising(AA filter) and 2D comb filter right.

  Using this filter you can remove high frequency glitches.

Thanks,

Poornima

TomMac

Hi,

I defined  Res to 16 and changes the lines aas you mentioned. now the design is working.

Thanks a lot for your help . thank you so much.

regards 

Ankit Kumar

Hello,

The codestream will have a 16-byte ADI header in front of it in the form:

0xFF FF FF FX where x is 0 or 1

0xYY YY YY YY where Y is a 32-bit image index-- it should start at 0 and go up by 1 each codestream

0xZZ AA 00 02 where ZZ is the COD_STYLE…