On Tue, Sep 15, 2009 at 09:06:58AM -0700, E. Ornelas wrote: > > Thanks for the help. > > I have another question: > I noticed that the transfer is done 8-bit at a time. > I need to write a 24-bit word into a ADF4153 Frequency Synthesizer. > Is it possible to transfer 24-bit in a single burst?
The example below writes 32 bits in a single transfer. You can confirm this by looking at the SEN and CLK signals. To send 24-bits, give it 3 bytes. Eric > Again, thank you for your time. > > > Eric Blossom wrote: > > > > On Mon, Sep 14, 2009 at 11:02:36AM -0700, E. Ornelas wrote: > >> > >> Hello. > >> I'm trying to use the SPI interface of a BasicRX. > >> I made a small test program. > >> It basically keeps on writing. > >> > >> There are a few things I need to know: > >> 1 - is this the right way to use the SPI? > > > > Pretty close. See below. > > > >> 2 - is the buffer the hex number passed as a string? > > > > It's binary, not hex. > > > >> 3 - Even though I don't know what to expect with the buffer I used, I at > >> least expected to see something in the BasicRX SPI pins, which I don't... > >> I > >> can see some periodic bursts on the clock pin but nothing on the signal. > > > > We never implemented SPI_FMT_LSB; Use SPI_FMT_MSB instead. > > > > > > Try this: > > > > from gnuradio import usrp > > > > u = usrp.source_c(0) > > spi_cmd = ''.join([chr(x) for x in [0x55, 0xAA, 0x55, 0xAA]]) > > > > while True: > > r = u._write_spi(0, usrp.SPI_ENABLE_RX_A, > > usrp.SPI_FMT_HDR_0|usrp.SPI_FMT_MSB, spi_cmd) > > > > > > > > Look at the SDI (into the d'board), SCLK and SEN pins. > > > > Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
