April 25, 2016 - 6:33am, 3110 views
Currently we are trying to communicat with EHS6 through USB HSIC interface in Qualcomm chipset.
Please help to provide quickly guideline for reference.
Thank you.Regards, Paris
The EHS6 module's HSIC is not a popular interface, I don't remember any HSIC issue on the forum so far.
So unfortunately I don't have any ready to use description for that.
There are 6 lines needed: HSIC_STRB, HSIC_DATA and 4 signal lines for Link Power Management. You can find details in the module's hardware description document. The LPM lines are shared with GPIO and need to be configured with AT^SCFG command for HSIC. There's more in the At commands specification document.
Have you already tried to use this interface? Can you share some information about what you connect to it and if there are any particular difficulties or problems?
Thank you for prompt reply.
Current we only wire strobe/data line from application CPU to EHS6 for HSIC interface.
So we may need wired following 4 lines for LPM control?GPIO16 --> AP_WAKEUP which is available on board on right upper corner under SPI MOSI
GPIO17 --> HOST_ACTIVE which is available on board on right upper corner under SPI MISO
GPIO18 --> CP_WAKEUP which is available on board on left lower corner under GPIO lowest one GPIO18
GPIO19 --> SUSPEND which is available on board on right upper corner under SPI CS
If so, do you have doc for those 4 pins timing control and procdure? also do you have Linux driver for reference?
Many thank you for support.
I personally don't have any experience with HSIC so I consulted with the customer support team and they are already working on your request. I don't think I could provide you more support then they.
At the moment I don't have more detailed documents.
As it is a high speed connection the wiring should be done with care to no exceed the 10cm length and to 50 Ohm impedance should also be provided. As far as I know the strobe and data lines are connected to the "antenna like" connectors on the left of Eval Bard. So it might be a good way to use these connectors and make the lines shielded.
And for the LPM lines they should be compliant to the High Speed USB 2.0 interface with 480Mbit/s. So I'd search for such a document for details about the lines desired behaviour. I think taht while waiting for more information from the support line team you should use these lines as the document does not claim they are optional. I'm not sure but you might be the first customer asking for help with this interface.
Please keeping post in the thread if you get the support line team's feedback about LPM lines.
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