I have an issue related the usage of CX3 solution.
Let me say that the CX3 based board we designed time ago works fine when the sensor works with clock gated (not in continuous mode).
We are not considering a Video sensor but a Radar sensor where the payload are the conversions from antenna signals. This is not fundamental but it is important when we will consider the configuration procedure of the sensor.
In few words we have our Radar sensor able to stream data on the Host system.
When the Radar works with clock gated and so we have clock that goes from LP11 to HS for each frame, everything works fine.
Instead we are having problems when we need to use the continuous clock mode.
In this working mode we see CX3 in Mipi Csi2 INIT_DONE state (at the beginning the clock and data lanes are kept in LP11 for at least 1ms and this is handled successfully).
I saw on the web that there is a procedure to be done to manage the continuous clock, but this is not clear to me and I don’t know if this is OK with our radar system.
This radar is programmed in order to do a sequence of acquisitions (like several video frames), following several profiles, and then the acquisition starts, it involves the sending of several data frames (called chirps – with related payload encapsulated in several data frames).
For each data frame we have one Frame Start, Line Start, Payload, Line End, Frame End, and then again, ...
This is the procedure available on the Community Forum.
- Upon receiving the Set_Cur (Commit control) request from the host, perform a MIPI reset (CyU3PMipicsiReset() with the reset type as Hard reset ).
- Initialize the MIPI bridge (CyU3PMipicsiInit () )
- Set the MIPI interface parameters (CyU3PMipicsiSetIntfParams ()).
- Release the reset of the sensor (XRST) (CyU3PMipicsiSetSensorControl() ).
- Configure the sensor.
Can you better explain the procedure because I cannot reconfigure the sensor at each data frame?
In this working mode, we will receive several data frames with related synch packets (Short Packet Frames) with clock always in High Speed.
Thanks a lot for your support.
Best regards Edo.