digital_io.h

// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
 
#include "fsl_gpio.h"
#include "pw_containers/intrusive_forward_list.h"
#include "pw_digital_io/digital_io.h"
 
namespace pw::digital_io {
 
PW_EXTERN_C void GPIO_INTA_DriverIRQHandler();
 
class McuxpressoDigitalOut : public pw::digital_io::DigitalOut {
 public:
  McuxpressoDigitalOut(GPIO_Type* base,
                       uint32_t port,
                       uint32_t pin,
                       pw::digital_io::State initial_state);
 
  bool is_enabled() const { return enabled_; }
 
 private:
  pw::Status DoEnable(bool enable) override;
  pw::Status DoSetState(pw::digital_io::State state) override;
 
  GPIO_Type* base_;
  const uint32_t port_;
  const uint32_t pin_;
  const pw::digital_io::State initial_state_;
  bool enabled_ = false;
};
 
class McuxpressoDigitalIn : public pw::digital_io::DigitalIn {
 public:
  McuxpressoDigitalIn(GPIO_Type* base, uint32_t port, uint32_t pin);
 
  bool is_enabled() const { return enabled_; }
 
 private:
  pw::Status DoEnable(bool enable) override;
  pw::Result<pw::digital_io::State> DoGetState() override;
 
  GPIO_Type* base_;
  const uint32_t port_;
  const uint32_t pin_;
  bool enabled_ = false;
};
 
class McuxpressoDigitalInOutInterrupt
    : public pw::digital_io::DigitalInOutInterrupt,
      public pw::IntrusiveForwardList<McuxpressoDigitalInOutInterrupt>::Item {
 public:
  McuxpressoDigitalInOutInterrupt(GPIO_Type* base,
                                  uint32_t port,
                                  uint32_t pin,
                                  bool output);
 
  bool is_enabled() const { return enabled_; }
 
 private:
  friend void GPIO_INTA_DriverIRQHandler();
  pw::Status DoEnable(bool enable) override;
  pw::Result<pw::digital_io::State> DoGetState() override;
  pw::Status DoSetState(pw::digital_io::State state) override;
  pw::Status DoSetInterruptHandler(
      pw::digital_io::InterruptTrigger trigger,
      pw::digital_io::InterruptHandler&& handler) override;
  pw::Status DoEnableInterruptHandler(bool enable) override;
 
  void ConfigureInterrupt() const;
 
  GPIO_Type* base_;
  const uint32_t port_;
  const uint32_t pin_;
  const bool output_;
  pw::digital_io::InterruptTrigger trigger_;
  pw::digital_io::InterruptHandler interrupt_handler_;
  bool enabled_ = false;
};
 
}  // namespace pw::digital_io