usrp Namespace Reference

Classes
class	tune_result
	Container for intermediate tuning information. More...
class	usrp_common
class	sink_c
class	sink_s
class	source_c
class	source_s
Functions
def	tune
	Set the center frequency we're interested in.
def	determine_rx_mux_value
	Determine appropriate Rx mux value as a function of the subdevice choosen and the characteristics of the respective daughterboard.
def	determine_tx_mux_value
	Determine appropriate Tx mux value as a function of the subdevice choosen.
def	selected_subdev
	Return the user specified daughterboard subdevice.
def	calc_dxc_freq
	Calculate the frequency to use for setting the digital up or down converter.
def	pick_tx_subdevice
	The user didn't specify a tx subdevice on the command line.
def	pick_rx_subdevice
	The user didn't specify an rx subdevice on the command line.
def	pick_subdev
Variables
	FPGA_MODE_NORMAL = usrp1.FPGA_MODE_NORMAL
	FPGA_MODE_LOOPBACK = usrp1.FPGA_MODE_LOOPBACK
	FPGA_MODE_COUNTING = usrp1.FPGA_MODE_COUNTING
	SPI_FMT_xSB_MASK = usrp1.SPI_FMT_xSB_MASK
	SPI_FMT_LSB = usrp1.SPI_FMT_LSB
	SPI_FMT_MSB = usrp1.SPI_FMT_MSB
	SPI_FMT_HDR_MASK = usrp1.SPI_FMT_HDR_MASK
	SPI_FMT_HDR_0 = usrp1.SPI_FMT_HDR_0
	SPI_FMT_HDR_1 = usrp1.SPI_FMT_HDR_1
	SPI_FMT_HDR_2 = usrp1.SPI_FMT_HDR_2
	SPI_ENABLE_FPGA = usrp1.SPI_ENABLE_FPGA
	SPI_ENABLE_CODEC_A = usrp1.SPI_ENABLE_CODEC_A
	SPI_ENABLE_CODEC_B = usrp1.SPI_ENABLE_CODEC_B
	SPI_ENABLE_reserved = usrp1.SPI_ENABLE_reserved
	SPI_ENABLE_TX_A = usrp1.SPI_ENABLE_TX_A
	SPI_ENABLE_RX_A = usrp1.SPI_ENABLE_RX_A
	SPI_ENABLE_TX_B = usrp1.SPI_ENABLE_TX_B
	SPI_ENABLE_RX_B = usrp1.SPI_ENABLE_RX_B

---

Function Documentation

def usrp::calc_dxc_freq	(		target_freq,
			baseband_freq,
			fs
	)

Calculate the frequency to use for setting the digital up or down converter.

Parameters:

	target_freq,:	desired RF frequency (Hz) target_freq: number
	baseband_freq,:	the RF frequency that corresponds to DC in the IF. baseband_freq: number
	fs,:	converter sample rate fs: number

Returns:

: 2-tuple (ddc_freq, inverted) where ddc_freq is the value for the ddc and inverted is True if we're operating in an inverted Nyquist zone.

def usrp::determine_rx_mux_value	(		u,
			subdev_spec
	)

Determine appropriate Rx mux value as a function of the subdevice choosen and the characteristics of the respective daughterboard.

Parameters:

	u,:	instance of USRP source
	subdev_spec,:	return value from subdev option parser. subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0 or 1

Returns:

: the Rx mux value

def usrp::determine_tx_mux_value	(		u,
			subdev_spec
	)

Determine appropriate Tx mux value as a function of the subdevice choosen.

Parameters:

	u,:	instance of USRP source
	subdev_spec,:	return value from subdev option parser. subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0

Returns:

: the Rx mux value

def usrp::pick_rx_subdevice

(

u

)

The user didn't specify an rx subdevice on the command line.

Try for one of these, in order: FLEX_400, FLEX_900, FLEX_1200, FLEX_2400, TV_RX, DBS_RX, BASIC_RX, whatever's on side A.

Returns:

a subdev_spec

def usrp::pick_subdev	(		u,
			candidates
	)

Parameters:

	u,:	usrp instance
	candidates,:	list of dbids

Returns:

: subdev specification

def usrp::pick_tx_subdevice

(

u

)

The user didn't specify a tx subdevice on the command line.

Try for one of these, in order: FLEX_400, FLEX_900, FLEX_1200, FLEX_2400, BASIC_TX, whatever's on side A.

Returns:

a subdev_spec

def usrp::selected_subdev	(		u,
			subdev_spec
	)

Return the user specified daughterboard subdevice.

Parameters:

	u,:	an instance of usrp.source_* or usrp.sink_*
	subdev_spec,:	return value from subdev option parser. subdev_spec: (side, subdev), where side is 0 or 1 and subdev is 0 or 1

Returns:

: an weakref to an instance derived from db_base

def usrp::tune	(		u,
			chan,
			subdev,
			target_freq
	)

Set the center frequency we're interested in.

Parameters:

	u,:	instance of usrp.source_* or usrp.sink_*
	chan,:	DDC/DUC channel chan: int
	subdev,:	daughterboard subdevice
	target_freq,:	frequency in Hz

Returns:

False if failure else tune_result

Tuning is a two step process. First we ask the front-end to tune as close to the desired frequency as it can. Then we use the result of that operation and our target_frequency to determine the value for the digital down converter.

---

Variable Documentation

usrp::FPGA_MODE_COUNTING = usrp1.FPGA_MODE_COUNTING

usrp::FPGA_MODE_LOOPBACK = usrp1.FPGA_MODE_LOOPBACK

usrp::FPGA_MODE_NORMAL = usrp1.FPGA_MODE_NORMAL

usrp::SPI_ENABLE_CODEC_A = usrp1.SPI_ENABLE_CODEC_A

usrp::SPI_ENABLE_CODEC_B = usrp1.SPI_ENABLE_CODEC_B

usrp::SPI_ENABLE_FPGA = usrp1.SPI_ENABLE_FPGA

usrp::SPI_ENABLE_reserved = usrp1.SPI_ENABLE_reserved

usrp::SPI_ENABLE_RX_A = usrp1.SPI_ENABLE_RX_A

usrp::SPI_ENABLE_RX_B = usrp1.SPI_ENABLE_RX_B

usrp::SPI_ENABLE_TX_A = usrp1.SPI_ENABLE_TX_A

usrp::SPI_ENABLE_TX_B = usrp1.SPI_ENABLE_TX_B

usrp::SPI_FMT_HDR_0 = usrp1.SPI_FMT_HDR_0

usrp::SPI_FMT_HDR_1 = usrp1.SPI_FMT_HDR_1

usrp::SPI_FMT_HDR_2 = usrp1.SPI_FMT_HDR_2

usrp::SPI_FMT_HDR_MASK = usrp1.SPI_FMT_HDR_MASK

usrp::SPI_FMT_LSB = usrp1.SPI_FMT_LSB

usrp::SPI_FMT_MSB = usrp1.SPI_FMT_MSB

usrp::SPI_FMT_xSB_MASK = usrp1.SPI_FMT_xSB_MASK