AD9834.h

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// Copyright (c) 2024 anabrid GmbH
// Contact: https://www.anabrid.com/licensing/
//
// SPDX-License-Identifier: MIT OR GPL-2.0-or-later
 
#pragma once
 
#include <bus/bus.h>
#include <bus/functions.h>
#include <interfaces/signals.h>
 
namespace functions {
 
class AD9834 : public DataFunction {
public:
  static const SPISettings DEFAULT_SPI_SETTINGS;
 
  static constexpr uint16_t REG_FREQ_0 = 0x4000;
  static constexpr uint16_t REG_FREQ_1 = 0x8000;
  static constexpr uint16_t REG_PHASE_0 = 0xC000;
  static constexpr uint16_t REG_PHASE_1 = 0xE000;
 
  static constexpr uint16_t REG_FREQ_MASK = 0x3FFF;
  static constexpr uint16_t REG_PHASE_MASK = 0x0FFF;
 
  static constexpr uint16_t CONTROL_B28 = 0x2000;
  static constexpr uint16_t CONTROL_HLB = 0x1000;
  static constexpr uint16_t CONTROL_FSEL = 0x0800;
  static constexpr uint16_t CONTROL_PSEL = 0x0400;
  static constexpr uint16_t CONTROL_PINSW = 0x0200; // Enables pin control mode
  static constexpr uint16_t CONTROL_RESET = 0x0100;
  static constexpr uint16_t CONTROL_SLEEP1 = 0x0080;
  static constexpr uint16_t CONTROL_SLEEP12 = 0x0040;
  static constexpr uint16_t CONTROL_OPBITEN = 0x0020; // Enables square wave
  static constexpr uint16_t CONTROL_SIGNPIB = 0x0010;
  static constexpr uint16_t CONTROL_DIV2 = 0x0008;
  static constexpr uint16_t CONTROL_MODE = 0x0002; // Changes output mode to triangle
 
  static constexpr uint16_t ENABLE_SQUARE_WAVE = CONTROL_OPBITEN;
  static constexpr uint16_t ENABLE_TRIANGLE_WAVE = CONTROL_MODE;
 
  static constexpr float MASTER_CLK = 75000000.0f;
 
  using DataFunction::DataFunction;
  explicit AD9834(bus::addr_t address, uint8_t alt_function_idx);

  bool init();
  void write_frequency(float freq);
  void write_phase(float phase);
  void write_wave_form(WaveForm wave_form);

  float get_real_frequency() const;
  float get_real_phase() const;

  void sleep();
  void awake();
 
private:
  uint16_t control_register = 0;
  uint32_t freq_register = 0;
  uint16_t phase_register = 0;
 
  void _write_control_register() const;
};
 
} // namespace functions