arduino-esp32/cores/esp32/esp32-hal-misc.c

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// 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

//     http://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.

#include "sdkconfig.h"
#include "esp32-hal-misc.h"
#include "esp32-hal.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_attr.h"
#include "nvs_flash.h"
#include "nvs.h"
#include "esp_partition.h"
#include "esp_log.h"
#include "esp_timer.h"
#ifdef CONFIG_BT_ENABLED
#include "esp_bt.h"
#endif //CONFIG_BT_ENABLED
#include <sys/time.h>
#include "soc/rtc.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/apb_ctrl_reg.h"
#include "esp_task_wdt.h"

#include "esp_system.h"
#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
#include "esp32/rom/rtc.h"
#elif CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/rom/rtc.h"
#else 
#error Target CONFIG_IDF_TARGET is not supported
#endif
#else // ESP32 Before IDF 4.0
#include "rom/rtc.h"
#endif

//Undocumented!!! Get chip temperature in Farenheit
//Source: https://github.com/pcbreflux/espressif/blob/master/esp32/arduino/sketchbook/ESP32_int_temp_sensor/ESP32_int_temp_sensor.ino
uint8_t temprature_sens_read();

float temperatureRead()
{
    return (temprature_sens_read() - 32) / 1.8;
}

void __yield()
{
    vPortYield();
}

void yield() __attribute__ ((weak, alias("__yield")));

unsigned long ARDUINO_ISR_ATTR micros()
{
    return (unsigned long) (esp_timer_get_time());
}

void ARDUINO_ISR_ATTR delayMicroseconds(uint32_t us)
{
    uint32_t m = micros();
    if(us){
        uint32_t e = (m + us);
        if(m > e){ //overflow
            while(micros() > e){
                NOP();
            }
        }
        while(micros() < e){
            NOP();
        }
    }
}