对于SBX射频子板的管理，最重要的是SBX子板类中的update_atr()方法。SBX子板类如下：
/***********************************************************************
* The SBX dboard
**********************************************************************/
class sbx_xcvr : public xcvr_dboard_base{
public:
sbx_xcvr(ctor_args_t args);
~sbx_xcvr(void);
protected:
uhd::dict<std::string, double> _tx_gains, _rx_gains;
double _rx_lo_freq, _tx_lo_freq;
std::string _tx_ant, _rx_ant;
bool _rx_lo_lock_cache, _tx_lo_lock_cache;
void set_rx_ant(const std::string &ant);
void set_tx_ant(const std::string &ant);
double set_rx_gain(double gain, const std::string &name);
double set_tx_gain(double gain, const std::string &name);
void update_atr(void);
/*!
* Set the LO frequency for the particular dboard unit.
* \param unit which unit rx or tx
* \param target_freq the desired frequency in Hz
* \return the actual frequency in Hz
*/
virtual double set_lo_freq(dboard_iface::unit_t unit, double target_freq);
/*!
* Get the lock detect status of the LO.
* \param unit which unit rx or tx
* \return true for locked
*/
sensor_value_t get_locked(dboard_iface::unit_t unit);
/*!
* Flash the LEDs
*/
void flash_leds(void);
/*!
* Version-agnostic ABC that wraps version-specific implementations of the
* WBX base daughterboard.
*
* This class is an abstract base class, and thus is impossible to
* instantiate.
*/
class sbx_versionx {
public:
sbx_versionx() {}
~sbx_versionx(void) {}
virtual double set_lo_freq(dboard_iface::unit_t unit, double target_freq) = 0;
};
/*!
* Version 3 of the SBX Daughterboard
*/
class sbx_version3 : public sbx_versionx {
public:
sbx_version3(sbx_xcvr *_self_sbx_xcvr);
~sbx_version3(void);
double set_lo_freq(dboard_iface::unit_t unit, double target_freq);
/*! This is the registered instance of the wrapper class, sbx_base. */
sbx_xcvr *self_base;
};
/*!
* Version 4 of the SBX Daughterboard
*
* The only difference in the fourth revision is the ADF4351 vs the ADF4350.
*/
class sbx_version4 : public sbx_versionx {
public:
sbx_version4(sbx_xcvr *_self_sbx_xcvr);
~sbx_version4(void);
double set_lo_freq(dboard_iface::unit_t unit, double target_freq);
/*! This is the registered instance of the wrapper class, sbx_base. */
sbx_xcvr *self_base;
};
/*!
* CBX daughterboard
*
* The only driver difference between SBX and CBX is the MAX2870 vs. ADF435x.
* There is also no LO filter switching required, but the GPIO is left blank
* so we don't worry about it.
*/
class cbx : public sbx_versionx {
public:
cbx(sbx_xcvr *_self_sbx_xcvr);
~cbx(void);
double set_lo_freq(dboard_iface::unit_t unit, double target_freq);
/*! This is the registered instance of the wrapper class, sbx_base. */
sbx_xcvr *self_base;
};
/*!
* Frequency range of the daughterboard; this is set in the constructor
* to correspond either to SBX or CBX.
*/
freq_range_t freq_range;
/*!
* Handle to the version-specific implementation of the SBX.
*
* Since many of this class's functions are dependent on the version of the
* SBX board, this class will instantiate an object of the appropriate
* sbx_version* subclass, and invoke any relevant functions through that
* object. This pointer is set to the proper object at construction time.
*/
typedef boost::shared_ptr<sbx_versionx> sbx_versionx_sptr;
sbx_versionx_sptr db_actual;
};
另外，对于SBX子板还定义了如下常量以及宏定义：
// Common IO Pins #define LO_LPF_EN (1 << 15) // TX IO Pins #define TRSW (1 << 14) // 0 = TX, 1 = RX #define TX_LED_TXRX (1 << 7) // LED for TX Antenna Selection TX/RX #define TX_LED_LD (1 << 6) // LED for TX Lock Detect #define DIS_POWER_TX (1 << 5) // on UNIT_TX, 0 powers up TX #define TX_ENABLE (1 << 4) // on UNIT_TX, 0 disables TX Mixer // RX IO Pins #define LNASW (1 << 14) // 0 = TX/RX, 1 = RX2 #define RX_LED_RX1RX2 (1 << 7) // LED for RX Antenna Selection RX1/RX2 #define RX_LED_LD (1 << 6) // LED for RX Lock Detect #define DIS_POWER_RX (1 << 5) // on UNIT_RX, 0 powers up RX #define RX_DISABLE (1 << 4) // on UNIT_RX, 1 disables RX Mixer and Baseband // TX Attenuator Pins #define TX_ATTN_SHIFT 8 // lsb of TX Attenuator Control #define TX_ATTN_MASK (63 << TX_ATTN_SHIFT) // valid bits of TX Attenuator Control // Mixer functions #define TX_MIXER_ENB (ADF435X_PDBRF|TX_ENABLE) #define TX_MIXER_DIS 0 #define RX_MIXER_ENB (ADF435X_PDBRF) #define RX_MIXER_DIS 0 // Pin functions #define TX_LED_IO (TX_LED_TXRX|TX_LED_LD) // LED gpio lines, pull down for LED #define TXIO_MASK (LO_LPF_EN|TRSW|ADF435X_CE|ADF435X_PDBRF|TX_ATTN_MASK|DIS_POWER_TX|TX_ENABLE) #define RX_LED_IO (RX_LED_RX1RX2|RX_LED_LD) // LED gpio lines, pull down for LED #define RXIO_MASK (LO_LPF_EN|LNASW|ADF435X_CE|ADF435X_PDBRF|RX_ATTN_MASK|DIS_POWER_RX|RX_DISABLE) // Power functions #define TX_POWER_UP (ADF435X_CE) #define TX_POWER_DOWN (DIS_POWER_TX) #define RX_POWER_UP (ADF435X_CE) #define RX_POWER_DOWN (DIS_POWER_RX) // Antenna constants #define ANT_TX TRSW //the tx line is transmitting #define ANT_RX 0 //the tx line is receiving #define ANT_TXRX 0 //the rx line is on txrx #define ANT_RX2 LNASW //the rx line in on rx2 #define ANT_XX LNASW //dont care how the antenna is set
/***********************************************************************
* The SBX dboard constants
**********************************************************************/
static const freq_range_t sbx_freq_range(400e6, 4.4e9);
static const freq_range_t cbx_freq_range(1200e6, 6.0e9);
static const freq_range_t sbx_tx_lo_2dbm = list_of
(range_t(0.35e9, 0.37e9))
;
static const freq_range_t sbx_enable_tx_lo_filter = list_of
(range_t(0.4e9, 1.5e9))
;
static const freq_range_t sbx_enable_rx_lo_filter = list_of
(range_t(0.4e9, 1.5e9))
;
static const std::vector<std::string> sbx_tx_antennas = list_of("TX/RX")("CAL");
static const std::vector<std::string> sbx_rx_antennas = list_of("TX/RX")("RX2")("CAL");
static const uhd::dict<std::string, gain_range_t> sbx_tx_gain_ranges = map_list_of
("PGA0", gain_range_t(0, 31.5, double(0.5)))
;
static const uhd::dict<std::string, gain_range_t> sbx_rx_gain_ranges = map_list_of
("PGA0", gain_range_t(0, 31.5, double(0.5)))
;
每次重新设置后，都要调用update_atr()进行ATR寄存器的数据更新，定义如下：
/***********************************************************************
* Antenna Handling
**********************************************************************/
void sbx_xcvr::update_atr(void){
//calculate atr pins
int rx_pga0_iobits = rx_pga0_gain_to_iobits(_rx_gains["PGA0"]);
int tx_pga0_iobits = tx_pga0_gain_to_iobits(_tx_gains["PGA0"]);
int rx_lo_lpf_en = (_rx_lo_freq == sbx_enable_rx_lo_filter.clip(_rx_lo_freq)) ? LO_LPF_EN : 0;
int tx_lo_lpf_en = (_tx_lo_freq == sbx_enable_tx_lo_filter.clip(_tx_lo_freq)) ? LO_LPF_EN : 0;
int rx_ld_led = _rx_lo_lock_cache ? 0 : RX_LED_LD;
int tx_ld_led = _tx_lo_lock_cache ? 0 : TX_LED_LD;
int rx_ant_led = _rx_ant == "TX/RX" ? RX_LED_RX1RX2 : 0;
int tx_ant_led = _tx_ant == "TX/RX" ? 0 : TX_LED_TXRX;
//setup the tx atr (this does not change with antenna)
this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, \
dboard_iface::ATR_REG_IDLE, 0 | tx_lo_lpf_en \
| tx_ld_led | tx_ant_led | TX_POWER_UP | ANT_XX | TX_MIXER_DIS);
//setup the rx atr (this does not change with antenna)
this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, \
dboard_iface::ATR_REG_IDLE, rx_pga0_iobits | rx_lo_lpf_en \
| rx_ld_led | rx_ant_led | RX_POWER_UP | ANT_XX | RX_MIXER_DIS);
//set the RX atr regs that change with antenna setting
this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, \
dboard_iface::ATR_REG_RX_ONLY, rx_pga0_iobits | rx_lo_lpf_en \
| rx_ld_led | rx_ant_led | RX_POWER_UP | RX_MIXER_ENB \
| ((_rx_ant != "RX2")? ANT_TXRX : ANT_RX2));
this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, \
dboard_iface::ATR_REG_TX_ONLY, rx_pga0_iobits | rx_lo_lpf_en \
| rx_ld_led | rx_ant_led | RX_POWER_UP | RX_MIXER_DIS \
| ((_rx_ant == "CAL")? ANT_TXRX : ANT_RX2));
this->get_iface()->set_atr_reg(dboard_iface::UNIT_RX, \
dboard_iface::ATR_REG_FULL_DUPLEX, rx_pga0_iobits | rx_lo_lpf_en \
| rx_ld_led | rx_ant_led | RX_POWER_UP | RX_MIXER_ENB \
| ((_rx_ant == "CAL")? ANT_TXRX : ANT_RX2));
//set the TX atr regs that change with antenna setting
this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, \
dboard_iface::ATR_REG_RX_ONLY, 0 | tx_lo_lpf_en \
| tx_ld_led | tx_ant_led | TX_POWER_UP | TX_MIXER_DIS \
| ((_rx_ant != "RX2")? ANT_RX : ANT_TX));
this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, \
dboard_iface::ATR_REG_TX_ONLY, tx_pga0_iobits | tx_lo_lpf_en \
| tx_ld_led | tx_ant_led | TX_POWER_UP | TX_MIXER_ENB \
| ((_tx_ant == "CAL")? ANT_RX : ANT_TX));
this->get_iface()->set_atr_reg(dboard_iface::UNIT_TX, \
dboard_iface::ATR_REG_FULL_DUPLEX, tx_pga0_iobits | tx_lo_lpf_en \
| tx_ld_led | tx_ant_led | TX_POWER_UP | TX_MIXER_ENB \
| ((_tx_ant == "CAL")? ANT_RX : ANT_TX));
}
