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?
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
>
>
>
>> Thanks in advance for any help you can give me.
>>
>> The code I'm using is the one below:
>>
>> from gnuradio import gr
>> from gnuradio import window
>> from gnuradio import usrp, howto
>> import wx
>> import time
>> from gnuradio import audio
>>
>> class FlowGraph(gr.top_block):
>> def __init__(self):
>> gr.top_block.__init__(self)
>>
>> decimation = 256
>> center_frequency = 10.7e6
>>
>> self.u = usrp.source_c(0, decimation,
>> fpga_filename="std_2rxhb_2tx.rbf")
>> self.u.set_nchannels(1)
>> self.subdev_spec = (0,0)
>> self.subdev = usrp.selected_subdev(self.u, self.subdev_spec)
>> self.subdev.set_auto_tr(True)
>> self.subdev.select_rx_antenna('RX2')
>> self.u.tune(0, self.subdev, center_frequency)
>> g = self.subdev.gain_range()
>> gain = float(g[0]+g[1])/2
>> self.subdev.set_gain(gain)
>>
>> if __name__ == "__main__":
>> print "Creating flowgraph..." ,
>> tb = TunerFlowGraph()
>> print "[DONE]"
>>
>> print "Starting flowgraph...",
>> tb.start()
>> print "[DONE]"
>>
>> while(1):
>> print "Writing to SPI...",
>> usrp.sink_s()._write_spi(0, usrp.SPI_ENABLE_RX_A,
>> usrp.SPI_FMT_HDR_0|usrp.SPI_FMT_LSB, "@")
>> time.sleep(.030)
>> print "[DONE]"
>
>
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>
>
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