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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