main.cpp

#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_task_wdt.h"
#include "soc/rtc.h"
#include "Arduino.h"
#if (ARDUINO_USB_CDC_ON_BOOT | ARDUINO_USB_MSC_ON_BOOT | ARDUINO_USB_DFU_ON_BOOT) && !ARDUINO_USB_MODE
#include "USB.h"
#if ARDUINO_USB_MSC_ON_BOOT
#include "FirmwareMSC.h"
#endif
#endif

#include "chip-debug-report.h"

#ifndef ARDUINO_LOOP_STACK_SIZE
#ifndef CONFIG_ARDUINO_LOOP_STACK_SIZE
#define ARDUINO_LOOP_STACK_SIZE 8192
#else
#define ARDUINO_LOOP_STACK_SIZE CONFIG_ARDUINO_LOOP_STACK_SIZE
#endif
#endif

TaskHandle_t loopTaskHandle = NULL;

#if CONFIG_AUTOSTART_ARDUINO
#if CONFIG_FREERTOS_UNICORE
void yieldIfNecessary(void) {
  static uint64_t lastYield = 0;
  uint64_t now = millis();
  if ((now - lastYield) > 2000) {
    lastYield = now;
    vTaskDelay(5);  //delay 1 RTOS tick
  }
}
#endif

bool loopTaskWDTEnabled;

__attribute__((weak)) size_t getArduinoLoopTaskStackSize(void) {
  return ARDUINO_LOOP_STACK_SIZE;
}

__attribute__((weak)) bool shouldPrintChipDebugReport(void) {
  return false;
}

void loopTask(void *pvParameters) {
#if !defined(NO_GLOBAL_INSTANCES) && !defined(NO_GLOBAL_SERIAL)
  // sets UART0 (default console) RX/TX pins as already configured in boot or as defined in variants/pins_arduino.h
  Serial0.setPins(gpioNumberToDigitalPin(SOC_RX0), gpioNumberToDigitalPin(SOC_TX0));
#endif
#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_DEBUG
  printBeforeSetupInfo();
#else
  if (shouldPrintChipDebugReport()) {
    printBeforeSetupInfo();
  }
#endif
  setup();
#if ARDUHAL_LOG_LEVEL >= ARDUHAL_LOG_LEVEL_DEBUG
  printAfterSetupInfo();
#else
  if (shouldPrintChipDebugReport()) {
    printAfterSetupInfo();
  }
#endif
  for (;;) {
#if CONFIG_FREERTOS_UNICORE
    yieldIfNecessary();
#endif
    if (loopTaskWDTEnabled) {
      esp_task_wdt_reset();
    }
    loop();
    if (serialEventRun) {
      serialEventRun();
    }
  }
}

extern "C" void app_main() {
#ifdef F_XTAL_MHZ
#if !CONFIG_IDF_TARGET_ESP32S2  // ESP32-S2 does not support rtc_clk_xtal_freq_update
  rtc_clk_xtal_freq_update((rtc_xtal_freq_t)F_XTAL_MHZ);
  rtc_clk_cpu_freq_set_xtal();
#endif
#endif
#ifdef F_CPU
  setCpuFrequencyMhz(F_CPU / 1000000);
#endif
#if ARDUINO_USB_CDC_ON_BOOT && !ARDUINO_USB_MODE
  Serial.begin();
#endif
#if ARDUINO_USB_MSC_ON_BOOT && !ARDUINO_USB_MODE
  MSC_Update.begin();
#endif
#if ARDUINO_USB_DFU_ON_BOOT && !ARDUINO_USB_MODE
  USB.enableDFU();
#endif
#if ARDUINO_USB_ON_BOOT && !ARDUINO_USB_MODE
  USB.begin();
#endif
  loopTaskWDTEnabled = false;
  initArduino();
  xTaskCreateUniversal(loopTask, "loopTask", getArduinoLoopTaskStackSize(), NULL, 1, &loopTaskHandle, ARDUINO_RUNNING_CORE);
}

#endif