On Thu, Jul 07, 2005 at 07:14:31AM -0700, Heiko Jones wrote:
> How do I set the mux register to look at the AUX_ADC inputs? I am
> assuming it is the mux register I set, but, I searched and could find no
> documentation on what the bits of the mux register do.
You don't use the mux register to read the AUX_ADCs. See
usrp/host/lib/usrp_{basic,standard}.h for docs on all of this stuff.
See especially usrp_basic_rx::read_aux_adc and
usrp_basic_tx::read_aux_adc
/*!
* \brief Read auxiliary analog to digital converter.
*
* \param which_dboard [0,1] which d'board
* \param which_adc [0,1]
* \param value return 12-bit value [0,4095]
* \returns true iff successful
*/
bool read_aux_adc (int which_dboard, int which_adc, int *value);
/*!
* \brief Read auxiliary analog to digital converter.
*
* \param which_dboard [0,1] which d'board
* \param which_adc [0,1]
* \returns value in the range [0,4095] if successful, else READ_FAILED.
*/
int read_aux_adc (int which_dboard, int which_adc);
The second version has a python binding:
v = u.read_aux_adc(0, 0)
where u is an instance of a usrp.source_c or usrp.sink_c
> Do we have something like that?? I have a 1K/sec signal I need to
> look at. has anybody else used these inputs to bypass and go
> directly to the ADC??
The bad news is that these are read asynchronously using a slow path
over the USB. You probably can't read them fast enough to sample to
your 1K/sec signal, and the sampling is asynchronous.
Eric
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