22 namespace uhd { 
namespace usrp {
 
   23 class fe_connection_t;
 
   56     typedef std::shared_ptr<dboard_iface> 
sptr;
 
   75     enum aux_adc_t { AUX_ADC_A = int(
'a'), AUX_ADC_B = int(
'b') };
 
   87     virtual special_props_t get_special_props(
void) = 0;
 
   96     virtual void write_aux_dac(unit_t unit, aux_dac_t which_dac, 
double value) = 0;
 
  105     virtual double read_aux_adc(unit_t unit, aux_adc_t which_adc) = 0;
 
  114     virtual void set_pin_ctrl(unit_t unit, uint32_t value, uint32_t 
mask = 0xffff) = 0;
 
  122     virtual uint32_t get_pin_ctrl(unit_t unit) = 0;
 
  132     virtual void set_atr_reg(
 
  133         unit_t unit, atr_reg_t reg, uint32_t value, uint32_t 
mask = 0xffff) = 0;
 
  142     virtual uint32_t get_atr_reg(unit_t unit, atr_reg_t reg) = 0;
 
  151     virtual void set_gpio_ddr(unit_t unit, uint32_t value, uint32_t 
mask = 0xffff) = 0;
 
  159     virtual uint32_t get_gpio_ddr(unit_t unit) = 0;
 
  168     virtual void set_gpio_out(unit_t unit, uint32_t value, uint32_t 
mask = 0xffff) = 0;
 
  176     virtual uint32_t get_gpio_out(unit_t unit) = 0;
 
  184     virtual uint32_t read_gpio(unit_t unit) = 0;
 
  194     virtual void write_spi(
 
  195         unit_t unit, 
const spi_config_t& config, uint32_t data, 
size_t num_bits) = 0;
 
  206     virtual uint32_t read_write_spi(
 
  207         unit_t unit, 
const spi_config_t& config, uint32_t data, 
size_t num_bits) = 0;
 
  215     virtual void set_clock_rate(unit_t unit, 
double rate) = 0;
 
  223     virtual double get_clock_rate(unit_t unit) = 0;
 
  231     virtual std::vector<double> get_clock_rates(unit_t unit) = 0;
 
  239     virtual void set_clock_enabled(unit_t unit, 
bool enb) = 0;
 
  248     virtual double get_codec_rate(unit_t unit) = 0;
 
  257     virtual void set_fe_connection(unit_t unit,
 
  258         const std::string& fe_name,
 
  284     virtual void sleep(
const std::chrono::nanoseconds& time);
 
  292         std::function<
void(uint32_t, uint32_t)>,
 
  293         std::function<uint32_t(uint32_t)>)