Re: [Discuss-gnuradio] External Clock in GRC

[Eric Schneider]

Damien,

I use:
        <param>
                <name>Clock Source</name>
                <key>usrp2_clock_src</key>
                <value>usrp2.MC_WE_DONT_LOCK</value>
                <type>enum</type>
                <option>
                        <name>Internal</name>
                        <key>usrp2.MC_WE_DONT_LOCK</key>
                </option>
                <option>
                        <name>External SMA</name>
                        <key>usrp2.MC_WE_LOCK_TO_SMA</key>
                </option>
                <option>
                        <name>External MIMO</name>
                        <key>usrp2.MC_WE_LOCK_TO_MIMO</key>
                </option>
        </param>

and <make>:
        self.$(id).config_mimo($usrp2_clock_src)

It works for me.  To be complete it should probably have an option for
MC_PROVIDE_CLK_TO_MIMO, but I don't use it so wasn't motivated enough.

I thought this was going to be pushed into the repo master branch.
*shrug*

--Eric

On Tue, 2010-05-25 at 05:28 -0700, Damien S. wrote:
> Hello,
> I'm trying to use the external clock input of the USRP2. Since i'm using
> GRC, i tried to modify the xml usrp2_source block (the usrp2_source_xxxx.xml
> file) to add this feature. This is what I did:
> I added a <-PARAM> section:
>       <-param>
>               <name>Clock type</name>
>               <key>clk_type</key>
>               <type>enum</type>
>               <option>
>                       <name>Internal</name>
>                       <key>internal</key>
>                       <opt>fcn:usrp2.MC_WE_DONT_LOCK</opt>
>               </option>
>               <option>
>                       <name>External</name>
>                       <key>external</key>
>                       <opt>fcn:usrp2.MC_WE_LOCK_TO_SMA</opt>
>               </option>
>       <-/param>
> And i added this command in the <make> section:
> self.$(id).config_mimo($clk_type.fcn)
> 
> Can you tell me if there is a chance for this to work ? And if i am using
> the good command to use the external clock (i read that it was also possible
> to modify the firware to use the external clock) ?
> 
> Thanks in advance.
> Damien S.