HardwareGPIO_RPI.h

#pragma once
/*
  HardwareGPIO_RPI.h 
  Copyright (c) 2025 Phil Schatzmann. All right reserved.
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef USE_RPI
#include "HardwareGPIO.h"
#include <map>
 
 
namespace arduino {
 
class HardwareGPIO_RPI : public HardwareGPIO {
 public:
  HardwareGPIO_RPI() = default;
 
  HardwareGPIO_RPI(const char* devName) : device_name(devName) {}
 
  ~HardwareGPIO_RPI();
 
  void begin();
 
  void pinMode(pin_size_t pinNumber, PinMode pinMode) override;
 
  void digitalWrite(pin_size_t pinNumber, PinStatus status) override;
 
  PinStatus digitalRead(pin_size_t pinNumber) override;
 
  int analogRead(pin_size_t pinNumber) override;
 
  void analogReference(uint8_t mode) override;
 
  void analogWrite(pin_size_t pinNumber, int value) override;
 
  void tone(uint8_t _pin, unsigned int frequency,
            unsigned long duration = 0) override;
 
  void noTone(uint8_t _pin) override;
 
  unsigned long pulseIn(uint8_t pin, uint8_t state,
                        unsigned long timeout = 1000000L) override;
 
  unsigned long pulseInLong(uint8_t pin, uint8_t state,
                            unsigned long timeout = 1000000L) override;
 
  void analogWriteFrequency(pin_size_t pin, uint32_t freq);
 
  void analogWriteResolution(uint8_t bits);
 
  operator bool() { return is_open; }
 
 protected:
  int m_analogReference = 0;
  std::map<pin_size_t, uint32_t> gpio_frequencies;
  int pwm_pins[4] = {12, 13, 18, 19};
  bool is_open = false;
  const char* device_name = "gpiochip0";
  uint32_t max_value = 255; // Default for 8-bit resolution
 
  uint32_t getFrequency(int pin);
};
 
}  // namespace arduino
 
#endif