Perfect Eric. Thank you for the details...
Angilberto. --- Eric Blossom <[EMAIL PROTECTED]> wrote: > On Mon, Apr 03, 2006 at 06:34:24AM -0700, Angilberto > Muniz Sb wrote: > > Folks, > > Is it possible to read/write from/to the low speed > > ADC/DAC from Python? > > The python interfaces to the usrp are specified in > gr-usrp/src/usrp1.py. Check > usrp/host/lib/usrp_basic.h for the > missing documentation (sorry about that. We've got > a situation that's > violating the "write once" rule): > > > //! magic value used on alternate register read > interfaces > static const int READ_FAILED = -99999; > > /*! > * \brief Write auxiliary digital to analog > converter. > * > * \param which_dboard [0,1] which d'board > * N.B., SLOT_TX_A and SLOT_RX_A share the > same AUX DAC's. > * SLOT_TX_B and SLOT_RX_B share the > same AUX DAC's. > * \param which_dac [2,3] TX slots must use only > 2 and 3. > * \param value [0,4095] > * \returns true iff successful > */ > bool write_aux_dac (int which_board, int > which_dac, 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); > > > So from python: > > d_board = 0 # 0: side A, 1: side B > > v = u.read_aux_adc(d_board, 0) > ok = write_aux_dac(d_board, 2, 2048) > > Be sure to pay attention to the comments above that > start with N.B. > You may also want to take a look at the usrp > schematics if this isn't clear. > > > > If possible, what would be a safe rate ? > > It's pretty slow. You'll need to try it to see how > fast it'll run on > your system. Each read or write is a round trip > across the USB, plus > bit banging the SPI bus to talk to the AD9862. > There's no clock > pacing the reads and writes of the the aux > dac/adc's, so the samples > won't be evenly spaced. Most daughterboards that > use them, use them > for things like setting an analog gain control, or > reading back an RSSI > indication. > > Eric > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
