射频子板由母板通过“子板接口类”进行管理。“子板接口类”继承自i2c：
/*!
* The daughter board dboard interface to be subclassed.
* A dboard instance interfaces with the mboard though this api.
* This interface provides i2c, spi, gpio, atr, aux dac/adc access.
* Each mboard should have a specially tailored iface for its dboard.
*/
class UHD_API dboard_iface : public uhd::i2c_iface{
public:
typedef boost::shared_ptr<dboard_iface> sptr;
typedef dboard_iface_special_props_t special_props_t;
//! tells the host which unit to use
enum unit_t{
UNIT_RX = int('r'),
UNIT_TX = int('t')
};
//! possible atr registers
enum atr_reg_t{
ATR_REG_IDLE = int('i'),
ATR_REG_TX_ONLY = int('t'),
ATR_REG_RX_ONLY = int('r'),
ATR_REG_FULL_DUPLEX = int('f')
};
//! aux dac selection enums (per unit)
enum aux_dac_t{
AUX_DAC_A = int('a'),
AUX_DAC_B = int('b'),
AUX_DAC_C = int('c'),
AUX_DAC_D = int('d')
};
//! aux adc selection enums (per unit)
enum aux_adc_t{
AUX_ADC_A = int('a'),
AUX_ADC_B = int('b')
};
/*!
* Get special properties information for this dboard slot.
* This call helps the dboard code to handle implementation
* differences between different motherboards and dboard slots.
* \return the special properties struct
*/
virtual special_props_t get_special_props(void) = 0;
/*!
* Write to an aux dac.
*
* \param unit which unit rx or tx
* \param which_dac the dac index 0, 1, 2, 3...
* \param value the value in volts
*/
virtual void write_aux_dac(unit_t unit, aux_dac_t which_dac, double value) = 0;
/*!
* Read from an aux adc.
*
* \param unit which unit rx or tx
* \param which_adc the adc index 0, 1, 2, 3...
* \return the value in volts
*/
virtual double read_aux_adc(unit_t unit, aux_adc_t which_adc) = 0;
/*!
* Set a daughterboard output pin control source.
*
* \param unit which unit rx or tx
* \param value 16-bits, 0=GPIO controlled, 1=ATR controlled
* \param mask 16-bits, 0=do not change, 1=change value
*/
virtual void set_pin_ctrl(
unit_t unit, boost::uint16_t value, boost::uint16_t mask = 0xffff
);
/*!
* Read back the pin control setting.
*
* \param unit which unit rx or tx
* \return the 16-bit settings value
*/
virtual boost::uint16_t get_pin_ctrl(unit_t unit);
/*!
* Set a daughterboard ATR register.
*
* \param unit which unit rx or tx
* \param reg which ATR register
* \param value 16-bits, 0=ATR output low, 1=ATR output high
* \param mask 16-bits, 0=do not change, 1=change value
*/
virtual void set_atr_reg(
unit_t unit, atr_reg_t reg, boost::uint16_t value, boost::uint16_t mask = 0xffff
);
/*!
* Read back an ATR register setting.
*
* \param unit which unit rx or tx
* \param reg which ATR register
* \return the 16-bit settings value
*/
virtual boost::uint16_t get_atr_reg(unit_t unit, atr_reg_t reg);
/*!
* Set daughterboard GPIO data direction setting.
*
* \param unit which unit rx or tx
* \param value 16-bits, 0=GPIO input, 1=GPIO output
* \param mask 16-bits, 0=do not change, 1=change value
*/
virtual void set_gpio_ddr(
unit_t unit, boost::uint16_t value, boost::uint16_t mask = 0xffff
);
/*!
* Read back the GPIO data direction setting.
*
* \param unit which unit rx or tx
* \return the 16-bit settings value
*/
virtual boost::uint16_t get_gpio_ddr(unit_t unit);
/*!
* Set daughterboard GPIO pin output setting.
*
* \param unit which unit rx or tx
* \param value 16-bits, 0=GPIO output low, 1=GPIO output high
* \param mask 16-bits, 0=do not change, 1=change value
*/
virtual void set_gpio_out(
unit_t unit, boost::uint16_t value, boost::uint16_t mask = 0xffff
);
/*!
* Read back the GPIO pin output setting.
*
* \param unit which unit rx or tx
* \return the 16-bit settings value
*/
virtual boost::uint16_t get_gpio_out(unit_t unit);
/*!
* Setup the GPIO debug mux.
*
* \param unit which unit rx or tx
* \param which which debug: 0, 1
*/
virtual void set_gpio_debug(unit_t unit, int which) = 0;
/*!
* Read daughterboard GPIO pin values.
*
* \param unit which unit rx or tx
* \return the value of the gpio unit
*/
virtual boost::uint16_t read_gpio(unit_t unit) = 0;
/*!
* Write data to SPI bus peripheral.
*
* \param unit which unit, rx or tx
* \param config configuration settings
* \param data the bits to write MSB first
* \param num_bits the number of bits in data
*/
virtual void write_spi(
unit_t unit,
const spi_config_t &config,
boost::uint32_t data,
size_t num_bits
) = 0;
/*!
* Read and write data to SPI bus peripheral.
*
* \param unit which unit, rx or tx
* \param config configuration settings
* \param data the bits to write MSB first
* \param num_bits the number of bits in data
* \return the data that was read
*/
virtual boost::uint32_t read_write_spi(
unit_t unit,
const spi_config_t &config,
boost::uint32_t data,
size_t num_bits
) = 0;
/*!
* Set the rate of a dboard clock.
*
* \param unit which unit rx or tx
* \param rate the clock rate in Hz
*/
virtual void set_clock_rate(unit_t unit, double rate) = 0;
/*!
* Get the rate of a dboard clock.
*
* \param unit which unit rx or tx
* \return the clock rate in Hz
*/
virtual double get_clock_rate(unit_t unit) = 0;
/*!
* Get a list of possible rates for the dboard clock.
*
* \param unit which unit rx or tx
* \return a list of clock rates in Hz
*/
virtual std::vector<double> get_clock_rates(unit_t unit) = 0;
/*!
* Enable or disable a dboard clock.
*
* \param unit which unit rx or tx
* \param enb true for enabled
*/
virtual void set_clock_enabled(unit_t unit, bool enb) = 0;
/*!
* Get the rate of the codec.
* For rx, this is the rate the ADC feeds the DSP.
* For tx, this is the rate the DSP feeds the DAC.
* \param unit which unit rx or tx
* \return the codec rate in Hz
*/
virtual double get_codec_rate(unit_t unit) = 0;
private:
UHD_PIMPL_DECL(impl) _impl;
virtual void _set_pin_ctrl(unit_t unit, boost::uint16_t value) = 0;
virtual void _set_atr_reg(unit_t unit, atr_reg_t reg, boost::uint16_t value) = 0;
virtual void _set_gpio_ddr(unit_t unit, boost::uint16_t value) = 0;
virtual void _set_gpio_out(unit_t unit, boost::uint16_t value) = 0;
protected:
dboard_iface(void);
public:
virtual ~dboard_iface(void);
};
当进行管理时，先定义通过属性树到达射频板的子板接口变量（子板接口对象），然后即可调用上述子板接口类提供的各种方法。比如：
dboard_iface::sptr iface = _tree->access<dboard_iface::sptr>(mb_root(mboard) / "dboards" / name / "iface").get();//定义接口变量
if (attr == "CTRL") return iface->get_pin_ctrl(unit);//通过接口变量调用方法
if (attr == "DDR") return iface->get_gpio_ddr(unit);
if (attr == "OUT") return iface->get_gpio_out(unit);
if (attr == "ATR_0X") return iface->get_atr_reg(unit, dboard_iface::ATR_REG_IDLE);
if (attr == "ATR_RX") return iface->get_atr_reg(unit, dboard_iface::ATR_REG_RX_ONLY);
if (attr == "ATR_TX") return iface->get_atr_reg(unit, dboard_iface::ATR_REG_TX_ONLY);
if (attr == "ATR_XX") return iface->get_atr_reg(unit, dboard_iface::ATR_REG_FULL_DUPLEX);
