pcal95555_i2c_interface.hpp

Go to the documentation of this file.

 
#pragma once
#include <cstddef>
#include <cstdint>
#include <functional>
 
namespace pcal95555 {
 
// ============================================================================
// GPIO Enums -- Standardised Control Pin Model
// ============================================================================
 
enum class CtrlPin : uint8_t {
  INTN = 0, 
  RSTN [[deprecated("PCA9555/PCAL9555A have no reset pin; use ResetToDefault()")]]
};
 
enum class GpioSignal : uint8_t {
  INACTIVE = 0, 
  ACTIVE   = 1  
};
 
template <typename Derived>
class I2cInterface {
public:
  bool Write(uint8_t addr, uint8_t reg, const uint8_t* data, size_t len) noexcept {
    return static_cast<Derived*>(this)->Write(addr, reg, data, len);
  }
 
  bool Read(uint8_t addr, uint8_t reg, uint8_t* data, size_t len) noexcept {
    return static_cast<Derived*>(this)->Read(addr, reg, data, len);
  }
 
  bool SetAddressPins(bool a0_level, bool a1_level, bool a2_level) noexcept {
    // Default implementation: not supported
    (void)a0_level;  // Suppress unused parameter warning
    (void)a1_level;
    (void)a2_level;
    return false;
  }
 
  bool EnsureInitialized() noexcept {
    return static_cast<Derived*>(this)->EnsureInitialized();
  }
 
  bool RegisterInterruptHandler(std::function<void()> handler) noexcept {
    // Default implementation: not supported
    (void)handler;  // Suppress unused parameter warning
    return false;
  }
 
  // --------------------------------------------------------------------------
 
  void GpioSet(CtrlPin pin, GpioSignal signal) noexcept {
    (void)pin;
    (void)signal;
  }
 
  bool GpioRead(CtrlPin pin, GpioSignal &signal) noexcept {
    (void)pin;
    (void)signal;
    return false;
  }
 
  void GpioSetActive(CtrlPin pin) noexcept { GpioSet(pin, GpioSignal::ACTIVE); }
 
  void GpioSetInactive(CtrlPin pin) noexcept { GpioSet(pin, GpioSignal::INACTIVE); }
 
 
protected:
  I2cInterface() = default;
 
  // Prevent copying
  I2cInterface(const I2cInterface&) = delete;
  I2cInterface& operator=(const I2cInterface&) = delete;
 
  // Allow moving
  I2cInterface(I2cInterface&&) = default;
  I2cInterface& operator=(I2cInterface&&) = default;
 
  ~I2cInterface() = default;
};
 
} // namespace pcal95555