PWMDriverRenesas.h

Go to the documentation of this file.

#pragma once
#if defined(ARDUINO_ARCH_RENESAS)
#include "AudioTools/CoreAudio/AudioPWM/PWMDriverBase.h"
#include "AudioTools/CoreAudio/AudioTimer/AudioTimer.h"
#include "pwm.h"
 
namespace audio_tools {
 
// forward declaration
class PWMDriverRenesas;
using PWMDriver = PWMDriverRenesas;
 
class PWMDriverRenesas : public DriverPWMBase {
 public:
  PWMDriverRenesas() { LOGD("PWMDriverRenesas"); }
 
  virtual PWMConfig defaultConfig() {
    PWMConfig cfg;
    Pins pwm_pins;
    // add default pins
    for (int j = 2; j < 13; j += 2) pwm_pins.push_back(j);
    cfg.setPins(pwm_pins);
    return cfg;
  }
 
  // Ends the output
  virtual void end() override {
    TRACED();
    ticker.end();  // it does not hurt to call this even if it has not been
                   // started
    is_timer_started = false;
 
    // stop and release pins
    for (int j = 0; j < audio_config.channels; j++) {
      if (pins[j] != nullptr) {
        pins[j]->suspend();
        pins[j]->end();
        delete pins[j];
        pins[j] = nullptr;
      }
    }
    pins.clear();
    // pins.shrink_to_fit();
    deleteBuffer();
  }
 
 protected:
  Vector<PwmOut*> pins;
  TimerAlarmRepeating ticker;  // calls a callback repeatedly with a timeout
 
  virtual void startTimer() override {
    TRACED();
    if (!is_timer_started) {
      TRACED();
      ticker.setCallbackParameter(this);
      int sample_rate = effectiveOutputSampleRate();
      if (isDecimateActive()) {
        LOGI("Using reduced sample rate: %d", effectiveOutputSampleRate());
      }
      ticker.begin(defaultPWMAudioOutputCallback, sample_rate, HZ);
      is_timer_started = true;
    }
  }
 
  virtual void setupPWM() {
    TRACED();
    if (audio_config.pwm_frequency == 0){
      audio_config.pwm_frequency = PWM_AUDIO_FREQUENCY;
    }
 
    pins.resize(audio_config.channels);
    for (int j = 0; j < audio_config.channels; j++) {
      LOGD("Processing channel %d", j);
      auto gpio = audio_config.pins()[j];
      PwmOut* pin = new PwmOut(gpio);
      LOGI("PWM Pin: %d", gpio);
      pin->begin(20000.0f, 0.0f);  // 50: 20000hz at 0%
      pins[j] = pin;
    }
  }
 
  virtual void setupTimer() {}
 
  virtual int maxChannels() { return PIN_PWM_COUNT; };
 
  virtual int maxOutputValue() {
    return 100;  // percent
  }
 
  virtual void pwmWrite(int channel, int value) {
    pins[channel]->pulse_perc(value);
  }
 
  static void defaultPWMAudioOutputCallback(void* obj) {
    PWMDriverRenesas* accessAudioPWM = (PWMDriverRenesas*)obj;
    if (accessAudioPWM != nullptr) {
      accessAudioPWM->playNextFrame();
    }
  }
 
  int maxSampleRate() override { return audio_config.max_sample_rate; }
 
  int decimation() override {
    for (int j = 1; j < 5; j++) {
      if (j % 2 == 0 && audio_config.sample_rate / j <= maxSampleRate()) {
        return j;
      }
    }
    return 5;
  }
};
 
}  // namespace audio_tools
 
#endif