Tasmota/tasmota/tasmota_support/support_esp.ino

/*
  support_esp.ino - ESP specific code for Tasmota

  Copyright (C) 2021  Theo Arends / Jörg Schüler-Maroldt

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*********************************************************************************************\
 * ESP8266 and ESP32 specific code
 *
 * At the end the common Tasmota calls are provided
\*********************************************************************************************/

/*********************************************************************************************\
 * ESP8266 Support
\*********************************************************************************************/

#ifdef ESP8266

extern "C" {
extern struct rst_info resetInfo;
}

uint32_t ESP_ResetInfoReason(void) {
  return resetInfo.reason;
}

String ESP_getResetReason(void) {
  return ESP.getResetReason();
}

uint32_t ESP_getChipId(void) {
  return ESP.getChipId();
}

uint32_t ESP_getFreeSketchSpace(void) {
  return ESP.getFreeSketchSpace();
}

uint32_t ESP_getSketchSize(void) {
  return ESP.getSketchSize();
}

uint32_t ESP_getFreeHeap(void) {
  return ESP.getFreeHeap();
}

uint32_t ESP_getFlashChipId(void) {
  return ESP.getFlashChipId();
}

uint32_t ESP_getFlashChipRealSize(void) {
  return ESP.getFlashChipRealSize();
}

void ESP_Restart(void) {
//  ESP.restart();            // This results in exception 3 on restarts on core 2.3.0
  ESP.reset();
}

uint32_t FlashWriteStartSector(void) {
  return (ESP.getSketchSize() / SPI_FLASH_SEC_SIZE) + 2;  // Stay on the safe side
}

uint32_t FlashWriteMaxSector(void) {
  return (((uint32_t)&_FS_start - 0x40200000) / SPI_FLASH_SEC_SIZE) - 2;
}

uint8_t* FlashDirectAccess(void) {
  return (uint8_t*)(0x40200000 + (FlashWriteStartSector() * SPI_FLASH_SEC_SIZE));
}

void *special_malloc(uint32_t size) {
  return malloc(size);
}

void *special_realloc(void *ptr, size_t size) {
  return realloc(ptr, size);
}

void *special_calloc(size_t num, size_t size) {
  return calloc(num, size);
}

String GetDeviceHardware(void) {
  // esptool.py get_efuses
  uint32_t efuse1 = *(uint32_t*)(0x3FF00050);
  uint32_t efuse2 = *(uint32_t*)(0x3FF00054);
//  uint32_t efuse3 = *(uint32_t*)(0x3FF00058);
//  uint32_t efuse4 = *(uint32_t*)(0x3FF0005C);

  if (((efuse1 & (1 << 4)) || (efuse2 & (1 << 16))) && (ESP.getFlashChipRealSize() < 1048577)) {  // ESP8285 can only have 1M flash
    return F("ESP8285");
  }
  return F("ESP8266EX");
}

String GetDeviceHardwareRevision(void) {
  // No known revisions for ESP8266/85
  return GetDeviceHardware();
}

#endif

/*********************************************************************************************\
 * ESP32 Support
\*********************************************************************************************/

#ifdef ESP32

#include "bootloader_flash.h"
// ESP32_ARCH contains the name of the architecture (used by autoconf)
#if CONFIG_IDF_TARGET_ESP32
  #define ESP32_ARCH              "esp32"
#elif CONFIG_IDF_TARGET_ESP32S2
  #define ESP32_ARCH              "esp32s2"
#elif CONFIG_IDF_TARGET_ESP32S3
  #define ESP32_ARCH              "esp32s3"
#elif CONFIG_IDF_TARGET_ESP32C3
  #define ESP32_ARCH              "esp32c3"
#else
  #define ESP32_ARCH              ""
#endif

// Handle 20k of NVM

#include <nvs.h>

// See libraries\ESP32\examples\ResetReason.ino
#if ESP_IDF_VERSION_MAJOR > 3      // IDF 4+
  #if CONFIG_IDF_TARGET_ESP32      // ESP32/PICO-D4
    #include "esp32/rom/rtc.h"
  #elif CONFIG_IDF_TARGET_ESP32S2  // ESP32-S2
    #include "esp32s2/rom/rtc.h"
  #elif CONFIG_IDF_TARGET_ESP32S3  // ESP32-S3
    #include "esp32s3/rom/rtc.h"
  #elif CONFIG_IDF_TARGET_ESP32C3  // ESP32-C3
    #include "esp32c3/rom/rtc.h"
  #else
    #error Target CONFIG_IDF_TARGET is not supported
  #endif
#else // ESP32 Before IDF 4.0
  #include "rom/rtc.h"
#endif

// Set the Stacksize for Arduino core. Default is 8192, some builds may need a bigger one
size_t getArduinoLoopTaskStackSize(void) {
    return SET_ESP32_STACK_SIZE;
}


#include <esp_phy_init.h>

bool NvmLoad(const char *sNvsName, const char *sName, void *pSettings, unsigned nSettingsLen) {
  nvs_handle_t handle;
  esp_err_t result = nvs_open(sNvsName, NVS_READONLY, &handle);
  if (result != ESP_OK) {
    AddLog(LOG_LEVEL_DEBUG, PSTR("NVS: Error %d"), result);
    return false;
  }
  size_t size = nSettingsLen;
  nvs_get_blob(handle, sName, pSettings, &size);
  nvs_close(handle);
  return true;
}

void NvmSave(const char *sNvsName, const char *sName, const void *pSettings, unsigned nSettingsLen) {
#ifdef USE_WEBCAM
  WcInterrupt(0);  // Stop stream if active to fix TG1WDT_SYS_RESET
#endif
  nvs_handle_t handle;
  esp_err_t result = nvs_open(sNvsName, NVS_READWRITE, &handle);
  if (result != ESP_OK) {
    AddLog(LOG_LEVEL_DEBUG, PSTR("NVS: Error %d"), result);
  } else {
    nvs_set_blob(handle, sName, pSettings, nSettingsLen);
    nvs_commit(handle);
    nvs_close(handle);
  }
#ifdef USE_WEBCAM
  WcInterrupt(1);
#endif
}

int32_t NvmErase(const char *sNvsName) {
  nvs_handle_t handle;
  int32_t result = nvs_open(sNvsName, NVS_READWRITE, &handle);
  if (ESP_OK == result) { result = nvs_erase_all(handle); }
  if (ESP_OK == result) { result = nvs_commit(handle); }
  nvs_close(handle);
  return result;
}

void SettingsErase(uint8_t type) {
  // SDK and Tasmota data is held in default NVS partition
  // Tasmota data is held also in file /.settings on default filesystem
  // cal_data - SDK PHY calibration data as documented in esp_phy_init.h
  // qpc      - Tasmota Quick Power Cycle state
  // main     - Tasmota Settings data
  int32_t r1, r2, r3 = 0;
  switch (type) {
    case 0:               // Reset 2 = Erase all flash from program end to end of physical flash
    case 2:               // Reset 5, 6 = Erase all flash from program end to end of physical flash excluding filesystem
//      nvs_flash_erase();  // Erase RTC, PHY, sta.mac, ap.sndchan, ap.mac, Tasmota etc.
      r1 = NvmErase("qpc");
      r2 = NvmErase("main");
#ifdef USE_UFILESYS
      r3 = TfsDeleteFile(TASM_FILE_SETTINGS);
#endif
      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION D_ERASE " Tasmota data (%d,%d,%d)"), r1, r2, r3);
      break;
    case 1:               // Reset 3 = SDK parameter area
    case 4:               // WIFI_FORCE_RF_CAL_ERASE = SDK parameter area
      r1 = esp_phy_erase_cal_data_in_nvs();
//      r1 = NvmErase("cal_data");
      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION D_ERASE " PHY data (%d)"), r1);
      break;
    case 3:               // QPC Reached = QPC, Tasmota and SDK parameter area (0x0F3xxx - 0x0FFFFF)
//      nvs_flash_erase();  // Erase RTC, PHY, sta.mac, ap.sndchan, ap.mac, Tasmota etc.
      r1 = NvmErase("qpc");
      r2 = NvmErase("main");
//      r3 = esp_phy_erase_cal_data_in_nvs();
//      r3 = NvmErase("cal_data");
//      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION D_ERASE " Tasmota (%d,%d) and PHY data (%d)"), r1, r2, r3);
#ifdef USE_UFILESYS
      r3 = TfsDeleteFile(TASM_FILE_SETTINGS);
#endif
      AddLog(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION D_ERASE " Tasmota data (%d,%d,%d)"), r1, r2, r3);
      break;
  }
}

uint32_t SettingsRead(void *data, size_t size) {
#ifdef USE_UFILESYS
  if (TfsLoadFile(TASM_FILE_SETTINGS, (uint8_t*)data, size)) {
    return 2;
  }
#endif
  if (NvmLoad("main", "Settings", data, size)) {
    return 1;
  };
  return 0;
}

void SettingsWrite(const void *pSettings, unsigned nSettingsLen) {
#ifdef USE_UFILESYS
  TfsSaveFile(TASM_FILE_SETTINGS, (const uint8_t*)pSettings, nSettingsLen);
#endif
  NvmSave("main", "Settings", pSettings, nSettingsLen);
}

void QPCRead(void *pSettings, unsigned nSettingsLen) {
  NvmLoad("qpc", "pcreg", pSettings, nSettingsLen);
}

void QPCWrite(const void *pSettings, unsigned nSettingsLen) {
  NvmSave("qpc", "pcreg", pSettings, nSettingsLen);
}

bool OtaFactoryRead(void) {
  uint32_t pOtaLoader;
  NvmLoad("otal", "otal", &pOtaLoader, sizeof(pOtaLoader));
  return pOtaLoader;
}

void OtaFactoryWrite(bool value) {
  uint32_t pOtaLoader = value;
  NvmSave("otal", "otal", &pOtaLoader, sizeof(pOtaLoader));
}

void NvsInfo(void) {
  nvs_stats_t nvs_stats;
  nvs_get_stats(NULL, &nvs_stats);
  AddLog(LOG_LEVEL_INFO, PSTR("NVS: Used %d/%d entries, NameSpaces %d"),
    nvs_stats.used_entries, nvs_stats.total_entries, nvs_stats.namespace_count);
}

//
// Flash memory mapping
//

// See Esp.cpp
#include "Esp.h"
#include "esp_spi_flash.h"
#include <memory>
#include <soc/soc.h>
#include <soc/efuse_reg.h>
#include <esp_partition.h>
extern "C" {
#include "esp_ota_ops.h"
#include "esp_image_format.h"
}
#include "esp_system.h"
#if ESP_IDF_VERSION_MAJOR > 3       // IDF 4+
  #if CONFIG_IDF_TARGET_ESP32       // ESP32/PICO-D4
    #include "esp32/rom/spi_flash.h"
  #elif CONFIG_IDF_TARGET_ESP32S2   // ESP32-S2
    #include "esp32s2/rom/spi_flash.h"
  #elif CONFIG_IDF_TARGET_ESP32S3   // ESP32-S3
    #include "esp32s3/rom/spi_flash.h"
  #elif CONFIG_IDF_TARGET_ESP32C3   // ESP32-C3
    #include "esp32c3/rom/spi_flash.h"
  #else
    #error Target CONFIG_IDF_TARGET is not supported
  #endif
#else // ESP32 Before IDF 4.0
  #include "rom/spi_flash.h"
#endif

uint32_t EspProgramSize(const char *label) {
  const esp_partition_t *part = esp_partition_find_first(ESP_PARTITION_TYPE_APP, ESP_PARTITION_SUBTYPE_ANY, label);
  if (!part) {
    return 0;
  }
  const esp_partition_pos_t part_pos  = {
    .offset = part->address,
    .size = part->size,
  };
  esp_image_metadata_t data;
  data.start_addr = part_pos.offset;
  esp_image_verify(ESP_IMAGE_VERIFY, &part_pos, &data);
  return data.image_len;
}

bool EspSingleOtaPartition(void) {
  return (1 == esp_ota_get_app_partition_count());
}

uint32_t EspRunningFactoryPartition(void) {
  const esp_partition_t *cur_part = esp_ota_get_running_partition();
//  return (cur_part->type == 0 && cur_part->subtype == 0);
  if (cur_part->type == 0 && cur_part->subtype == 0) {
    return cur_part->size;
  }
  return 0;
}

void EspPrepRestartToSafeBoot(void) {
  const esp_partition_t *otadata_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_OTA, NULL);
  if (otadata_partition) {
    esp_partition_erase_range(otadata_partition, 0, SPI_FLASH_SEC_SIZE * 2);
  }
}

bool EspPrepSwitchPartition(uint32_t state) {
  bool valid = EspSingleOtaPartition();
  if (valid) {
    bool running_factory = EspRunningFactoryPartition();
    switch (state) {
      case 0:  // Off = safeboot
        if (!running_factory) {
          EspPrepRestartToSafeBoot();
        } else {
          valid = false;
        }
        break;
      case 1:  // On = ota0
        if (running_factory) {
          const esp_partition_t* partition = esp_ota_get_next_update_partition(nullptr);
          esp_ota_set_boot_partition(partition);
        } else {
          valid = false;
        }
        break;
      case 2:  // Toggle
        if (!running_factory) {
          EspPrepRestartToSafeBoot();
        } else {
          const esp_partition_t* partition = esp_ota_get_next_update_partition(nullptr);
          esp_ota_set_boot_partition(partition);
        }
    }
  }
  return valid;
}

uint32_t EspFlashBaseAddress(void) {
  if (EspSingleOtaPartition()) {       // Only one partition so start at end of sketch
    const esp_partition_t *running = esp_ota_get_running_partition();
    if (!running) { return 0; }
    return running->address + ESP_getSketchSize();
  } else {                     // Select other partition
    const esp_partition_t* partition = esp_ota_get_next_update_partition(nullptr);
    if (!partition) { return 0; }
    return partition->address;  // For tasmota 0x00010000 or 0x00200000
  }
}

uint32_t EspFlashBaseEndAddress(void) {
  const esp_partition_t* partition = (EspSingleOtaPartition()) ? esp_ota_get_running_partition() : esp_ota_get_next_update_partition(nullptr);
  if (!partition) { return 0; }
  return partition->address + partition->size;  // For tasmota 0x00200000 or 0x003F0000
}

uint8_t* EspFlashMmap(uint32_t address) {
  static spi_flash_mmap_handle_t handle = 0;

  if (handle) {
    spi_flash_munmap(handle);
    handle = 0;
  }

  const uint8_t* data;
  int32_t err = spi_flash_mmap(address, 5 * SPI_FLASH_MMU_PAGE_SIZE, SPI_FLASH_MMAP_DATA, (const void **)&data, &handle);

/*
  AddLog(LOG_LEVEL_DEBUG, PSTR("DBG: Spi_flash_map %d"), err);

  spi_flash_mmap_dump();
*/
  return (uint8_t*)data;
}

/*
int32_t EspPartitionMmap(uint32_t action) {
  static spi_flash_mmap_handle_t handle;

  int32_t err = 0;
  if (1 == action) {
    const esp_partition_t *partition = esp_ota_get_running_partition();
//    const esp_partition_t* partition = esp_ota_get_next_update_partition(nullptr);
    if (!partition) { return 0; }
    err = esp_partition_mmap(partition, 0, 4 * SPI_FLASH_MMU_PAGE_SIZE, SPI_FLASH_MMAP_DATA, (const void **)&TasmotaGlobal_mmap_data, &handle);

    AddLog(LOG_LEVEL_DEBUG, PSTR("DBG: Partition start 0x%08X, Partition end 0x%08X, Mmap data 0x%08X"), partition->address, partition->size, TasmotaGlobal_mmap_data);

  } else {
    spi_flash_munmap(handle);
    handle = 0;
  }
  return err;
}

*/

//
// ESP32 specific
//

#include "soc/soc.h"
#include "soc/rtc_cntl_reg.h"

void DisableBrownout(void) {
  // https://github.com/espressif/arduino-esp32/issues/863#issuecomment-347179737
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);  // Disable brownout detector
}

//
// ESP32 Alternatives
//

String ESP32GetResetReason(uint32_t cpu_no) {
	// tools\sdk\include\esp32\rom\rtc.h
	// tools\sdk\esp32\include\esp_rom\include\esp32c3\rom\rtc.h
	// tools\sdk\esp32\include\esp_rom\include\esp32s2\rom\rtc.h
  switch (rtc_get_reset_reason(cpu_no)) {                                   //     ESP32             ESP32-S / ESP32-C
    case 1  : return F("Vbat power on reset");                              // 1   POWERON_RESET     POWERON_RESET
    case 3  : return F("Software reset digital core");                      // 3   SW_RESET          RTC_SW_SYS_RESET
    case 4  : return F("Legacy watch dog reset digital core");              // 4   OWDT_RESET        -
    case 5  : return F("Deep Sleep reset digital core");                    // 5   DEEPSLEEP_RESET   DEEPSLEEP_RESET
    case 6  : return F("Reset by SLC module, reset digital core");          // 6   SDIO_RESET
    case 7  : return F("Timer Group0 Watch dog reset digital core");        // 7   TG0WDT_SYS_RESET
    case 8  : return F("Timer Group1 Watch dog reset digital core");        // 8   TG1WDT_SYS_RESET
    case 9  : return F("RTC Watch dog Reset digital core");                 // 9   RTCWDT_SYS_RESET
    case 10 : return F("Instrusion tested to reset CPU");                   // 10  INTRUSION_RESET
    case 11 : return F("Time Group0 reset CPU");                            // 11  TGWDT_CPU_RESET   TG0WDT_CPU_RESET
    case 12 : return F("Software reset CPU");                               // 12  SW_CPU_RESET      RTC_SW_CPU_RESET
    case 13 : return F("RTC Watch dog Reset CPU");                          // 13  RTCWDT_CPU_RESET
    case 14 : return F("or APP CPU, reseted by PRO CPU");                   // 14  EXT_CPU_RESET     -
    case 15 : return F("Reset when the vdd voltage is not stable");         // 15  RTCWDT_BROWN_OUT_RESET
    case 16 : return F("RTC Watch dog reset digital core and rtc module");  // 16  RTCWDT_RTC_RESET
    case 17 : return F("Time Group1 reset CPU");                            // 17  -                 TG1WDT_CPU_RESET
    case 18 : return F("Super watchdog reset digital core and rtc module"); // 18  -                 SUPER_WDT_RESET
    case 19 : return F("Glitch reset digital core and rtc module");         // 19  -                 GLITCH_RTC_RESET
    case 20 : return F("Efuse reset digital core");                         // 20                    EFUSE_RESET
    case 21 : return F("Usb uart reset digital core");                      // 21                    USB_UART_CHIP_RESET
    case 22 : return F("Usb jtag reset digital core");                      // 22                    USB_JTAG_CHIP_RESET
    case 23 : return F("Power glitch reset digital core and rtc module");   // 23                    POWER_GLITCH_RESET
  }

  return F("No meaning");                                                   // 0 and undefined
}

String ESP_getResetReason(void) {
  return ESP32GetResetReason(0);  // CPU 0
}

uint32_t ESP_ResetInfoReason(void) {
  RESET_REASON reason = rtc_get_reset_reason(0);
  if (1  == reason) { return REASON_DEFAULT_RST; }       // POWERON_RESET
  if (12 == reason) { return REASON_SOFT_RESTART; }      // SW_CPU_RESET / RTC_SW_CPU_RESET
  if (5  == reason) { return REASON_DEEP_SLEEP_AWAKE; }  // DEEPSLEEP_RESET
  if (3  == reason) { return REASON_EXT_SYS_RST; }       // SW_RESET / RTC_SW_SYS_RESET
  return -1; //no "official error code", but should work with the current code base
}

uint32_t ESP_getChipId(void) {
  uint32_t id = 0;
  for (uint32_t i = 0; i < 17; i = i +8) {
    id |= ((ESP.getEfuseMac() >> (40 - i)) & 0xff) << i;
  }
  return id;
}

uint32_t ESP_getSketchSize(void) {
  static uint32_t sketchsize = 0;

  if (!sketchsize) {
    sketchsize = ESP.getSketchSize();  // This takes almost 2 seconds on an ESP32
  }
  return sketchsize;
}

uint32_t ESP_getFreeSketchSpace(void) {
  if (EspSingleOtaPartition()) {
    uint32_t size = EspRunningFactoryPartition();
    if (!size) {
      size = ESP.getFreeSketchSpace();
    }
    return size - ESP_getSketchSize();
  }
  return ESP.getFreeSketchSpace();
}

uint32_t ESP_getFreeHeap(void) {
  // ESP_getFreeHeap() returns also IRAM which we don't use
  return heap_caps_get_free_size(MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
}

uint32_t ESP_getMaxAllocHeap(void) {
  // arduino returns IRAM but we want only DRAM
  uint32_t free_block_size = heap_caps_get_largest_free_block(MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
  if (free_block_size > 100) { free_block_size -= 100; }
  return free_block_size;
}

int32_t ESP_getHeapFragmentation(void) {
  int32_t free_maxmem = 100 - (int32_t)(ESP_getMaxAllocHeap() * 100 / ESP_getFreeHeap());
  if (free_maxmem < 0) { free_maxmem = 0; }
  return free_maxmem;
}

uint32_t ESP_getFlashChipId(void)
{
  uint32_t id = bootloader_read_flash_id();
  id = ((id & 0xff) << 16) | ((id >> 16) & 0xff) | (id & 0xff00);
  return id;
}

uint32_t ESP_getFlashChipRealSize(void)
{
  uint32_t id = (ESP_getFlashChipId() >> 16) & 0xFF;
  return 2 << (id - 1);
}

void ESP_Restart(void) {
  ESP.restart();
}

uint32_t FlashWriteStartSector(void) {
  // Needs to be on SPI_FLASH_MMU_PAGE_SIZE (= 0x10000) alignment for mmap usage
  uint32_t aligned_address = ((EspFlashBaseAddress() + (2 * SPI_FLASH_MMU_PAGE_SIZE)) / SPI_FLASH_MMU_PAGE_SIZE) * SPI_FLASH_MMU_PAGE_SIZE;
  return aligned_address / SPI_FLASH_SEC_SIZE;
}

uint32_t FlashWriteMaxSector(void) {
  // Needs to be on SPI_FLASH_MMU_PAGE_SIZE (= 0x10000) alignment for mmap usage
  uint32_t aligned_end_address = (EspFlashBaseEndAddress() / SPI_FLASH_MMU_PAGE_SIZE) * SPI_FLASH_MMU_PAGE_SIZE;
  return aligned_end_address / SPI_FLASH_SEC_SIZE;
}

uint8_t* FlashDirectAccess(void) {
  uint32_t address = FlashWriteStartSector() * SPI_FLASH_SEC_SIZE;
  uint8_t* data = EspFlashMmap(address);
/*
  AddLog(LOG_LEVEL_DEBUG, PSTR("DBG: Flash start address 0x%08X, Mmap address 0x%08X"), address, data);

  uint8_t buf[32];
  memcpy(buf, data, sizeof(buf));
  AddLogBuffer(LOG_LEVEL_DEBUG, (uint8_t*)&buf, 32);
*/
  return data;
}

extern "C" {
  bool esp_spiram_is_initialized(void);
}

// this function is a replacement for `psramFound()`.
// `psramFound()` can return true even if no PSRAM is actually installed
// This new version also checks `esp_spiram_is_initialized` to know if the PSRAM is initialized
bool FoundPSRAM(void) {
#if CONFIG_IDF_TARGET_ESP32C3
  return psramFound();
#else
  return psramFound() && esp_spiram_is_initialized();
#endif
}

// new function to check whether PSRAM is present and supported (i.e. required pacthes are present)
bool UsePSRAM(void) {
  static bool can_use_psram = CanUsePSRAM();
  return FoundPSRAM() && can_use_psram;
}

void *special_malloc(uint32_t size) {
  if (UsePSRAM()) {
    return heap_caps_malloc(size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
  } else {
    return malloc(size);
  }
}
void *special_realloc(void *ptr, size_t size) {
  if (UsePSRAM()) {
    return heap_caps_realloc(ptr, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
  } else {
    return realloc(ptr, size);
  }
}
void *special_calloc(size_t num, size_t size) {
  if (UsePSRAM()) {
    return heap_caps_calloc(num, size, MALLOC_CAP_SPIRAM | MALLOC_CAP_8BIT);
  } else {
    return calloc(num, size);
  }
}

// Variants for IRAM heap, which need all accesses to be 32 bits aligned
void *special_malloc32(uint32_t size) {
  return heap_caps_malloc(size, MALLOC_CAP_32BIT);
}

float CpuTemperature(void) {
#ifdef CONFIG_IDF_TARGET_ESP32
  return (float)temperatureRead();  // In Celsius
/*
  // These jumps are not stable either. Sometimes it jumps to 77.3
  float t = (float)temperatureRead();  // In Celsius
  if (t > 81) { t = t - 27.2; }        // Fix temp jump observed on some ESP32 like DualR3
  return t;
*/
#else
  #ifndef CONFIG_IDF_TARGET_ESP32S3
    // Currently (20210801) repeated calls to temperatureRead() on ESP32C3 and ESP32S2 result in IDF error messages
    static float t = NAN;
    if (isnan(t)) {
      t = (float)temperatureRead();  // In Celsius
    }
    return t;
  #else
    return NAN;
  #endif
#endif
}

/*
#ifdef __cplusplus
extern "C" {
#endif

uint8_t temprature_sens_read();

#ifdef __cplusplus
}
#endif

#ifdef CONFIG_IDF_TARGET_ESP32
uint8_t temprature_sens_read();

float CpuTemperature(void) {
  uint8_t t = temprature_sens_read();

  AddLog(LOG_LEVEL_DEBUG, PSTR("TMP: value %d"), t);

  return (t - 32) / 1.8;
}
#else
float CpuTemperature(void) {
  // Currently (20210801) repeated calls to temperatureRead() on ESP32C3 and ESP32S2 result in IDF error messages
  static float t = NAN;
  if (isnan(t)) {
    t = (float)temperatureRead();  // In Celsius
  }
  return t;
}
#endif
*/

/*
#if CONFIG_IDF_TARGET_ESP32S2
#include "esp32s2/esp_efuse.h"
#elif CONFIG_IDF_TARGET_ESP32S3
#include "esp32s3/esp_efuse.h"
#elif CONFIG_IDF_TARGET_ESP32C3
#include "esp32c3/esp_efuse.h"
#endif
*/

// #include "esp_chip_info.h"

String GetDeviceHardware(void) {
  // https://www.espressif.com/en/products/socs

/*
Source: esp-idf esp_system.h and esptool

typedef enum {
    CHIP_ESP32  = 1, //!< ESP32
    CHIP_ESP32S2 = 2, //!< ESP32-S2
    CHIP_ESP32S3 = 9, //!< ESP32-S3
    CHIP_ESP32C3 = 5, //!< ESP32-C3
    CHIP_ESP32H2 = 6, //!< ESP32-H2
    CHIP_ESP32C2 = 12, //!< ESP32-C2
} esp_chip_model_t;

// Chip feature flags, used in esp_chip_info_t
#define CHIP_FEATURE_EMB_FLASH      BIT(0)      //!< Chip has embedded flash memory
#define CHIP_FEATURE_WIFI_BGN       BIT(1)      //!< Chip has 2.4GHz WiFi
#define CHIP_FEATURE_BLE            BIT(4)      //!< Chip has Bluetooth LE
#define CHIP_FEATURE_BT             BIT(5)      //!< Chip has Bluetooth Classic
#define CHIP_FEATURE_IEEE802154     BIT(6)      //!< Chip has IEEE 802.15.4
#define CHIP_FEATURE_EMB_PSRAM      BIT(7)      //!< Chip has embedded psram


// The structure represents information about the chip
typedef struct {
    esp_chip_model_t model;  //!< chip model, one of esp_chip_model_t
    uint32_t features;       //!< bit mask of CHIP_FEATURE_x feature flags
    uint8_t cores;           //!< number of CPU cores
    uint8_t revision;        //!< chip revision number
} esp_chip_info_t;

*/
  esp_chip_info_t chip_info;
  esp_chip_info(&chip_info);

  uint32_t chip_model = chip_info.model;
  uint32_t chip_revision = chip_info.revision;
//  uint32_t chip_revision = ESP.getChipRevision();
  bool rev3 = (3 == chip_revision);
//  bool single_core = (1 == ESP.getChipCores());
  bool single_core = (1 == chip_info.cores);

  if (chip_model < 2) {  // ESP32
#ifdef CONFIG_IDF_TARGET_ESP32
/* esptool:
    def get_pkg_version(self):
        word3 = self.read_efuse(3)
        pkg_version = (word3 >> 9) & 0x07
        pkg_version += ((word3 >> 2) & 0x1) << 3
        return pkg_version
*/
    uint32_t chip_ver = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG);
    uint32_t pkg_version = chip_ver & 0x7;

//    AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("HDW: ESP32 Model %d, Revision %d, Core %d, Package %d"), chip_info.model, chip_revision, chip_info.cores, chip_ver);

    switch (pkg_version) {
      case 0:
        if (single_core) { return F("ESP32-S0WDQ6"); }     // Max 240MHz, Single core, QFN 6*6
        else if (rev3)   { return F("ESP32-D0WDQ6-V3"); }  // Max 240MHz, Dual core, QFN 6*6
        else {             return F("ESP32-D0WDQ6"); }     // Max 240MHz, Dual core, QFN 6*6
      case 1:
        if (single_core) { return F("ESP32-S0WD"); }       // Max 160MHz, Single core, QFN 5*5, ESP32-SOLO-1, ESP32-DevKitC
        else if (rev3)   { return F("ESP32-D0WD-V3"); }    // Max 240MHz, Dual core, QFN 5*5, ESP32-WROOM-32E, ESP32_WROVER-E, ESP32-DevKitC
        else {             return F("ESP32-D0WD"); }       // Max 240MHz, Dual core, QFN 5*5, ESP32-WROOM-32D, ESP32_WROVER-B, ESP32-DevKitC
      case 2:              return F("ESP32-D2WD");         // Max 160MHz, Dual core, QFN 5*5, 2MB embedded flash
      case 3:
        if (single_core) { return F("ESP32-S0WD-OEM"); }   // Max 160MHz, Single core, QFN 5*5, Xiaomi Yeelight
        else {             return F("ESP32-D0WD-OEM"); }   // Max 240MHz, Dual core, QFN 5*5
      case 4:              return F("ESP32-U4WDH");        // Max 160MHz, Single core, QFN 5*5, 4MB embedded flash, ESP32-MINI-1, ESP32-DevKitM-1
      case 5:
        if (rev3)        { return F("ESP32-PICO-V3"); }    // Max 240MHz, Dual core, LGA 7*7, ESP32-PICO-V3-ZERO, ESP32-PICO-V3-ZERO-DevKit
        else {             return F("ESP32-PICO-D4"); }    // Max 240MHz, Dual core, LGA 7*7, 4MB embedded flash, ESP32-PICO-KIT
      case 6:              return F("ESP32-PICO-V3-02");   // Max 240MHz, Dual core, LGA 7*7, 8MB embedded flash, 2MB embedded PSRAM, ESP32-PICO-MINI-02, ESP32-PICO-DevKitM-2
      case 7:              return F("ESP32-D0WDR2-V3");    // Max 240MHz, Dual core, QFN 5*5, ESP32-WROOM-32E, ESP32_WROVER-E, ESP32-DevKitC
    }
#endif  // CONFIG_IDF_TARGET_ESP32
    return F("ESP32");
  }
  else if (2 == chip_model) {  // ESP32-S2
#ifdef CONFIG_IDF_TARGET_ESP32S2
/* esptool:
    def get_flash_version(self):
        num_word = 3
        block1_addr = self.EFUSE_BASE + 0x044
        word3 = self.read_reg(block1_addr + (4 * num_word))
        pkg_version = (word3 >> 21) & 0x0F
        return pkg_version

    def get_psram_version(self):
        num_word = 3
        block1_addr = self.EFUSE_BASE + 0x044
        word3 = self.read_reg(block1_addr + (4 * num_word))
        pkg_version = (word3 >> 28) & 0x0F
        return pkg_version
*/
    uint32_t chip_ver = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_3_REG, EFUSE_FLASH_VERSION);
    uint32_t psram_ver = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_3_REG, EFUSE_PSRAM_VERSION);
    uint32_t pkg_version = (chip_ver & 0xF) + ((psram_ver & 0xF) * 100);

//    AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("HDW: ESP32 Model %d, Revision %d, Core %d, Package %d"), chip_info.model, chip_revision, chip_info.cores, chip_ver);

    switch (pkg_version) {
      case 0:              return F("ESP32-S2");           // Max 240MHz, Single core, QFN 7*7, ESP32-S2-WROOM, ESP32-S2-WROVER, ESP32-S2-Saola-1, ESP32-S2-Kaluga-1
      case 1:              return F("ESP32-S2FH2");        // Max 240MHz, Single core, QFN 7*7, 2MB embedded flash, ESP32-S2-MINI-1, ESP32-S2-DevKitM-1
      case 2:              return F("ESP32-S2FH4");        // Max 240MHz, Single core, QFN 7*7, 4MB embedded flash
      case 3:              return F("ESP32-S2FN4R2");      // Max 240MHz, Single core, QFN 7*7, 4MB embedded flash, 2MB embedded PSRAM, , ESP32-S2-MINI-1U, ESP32-S2-DevKitM-1U
      case 100:            return F("ESP32-S2R2");
      case 102:            return F("ESP32-S2FNR2");       // Max 240MHz, Single core, QFN 7*7, 4MB embedded flash, 2MB embedded PSRAM, , Lolin S2 mini
    }
#endif  // CONFIG_IDF_TARGET_ESP32S2
    return F("ESP32-S2");
  }
  else if (9 == chip_model) {  // ESP32-S3
#ifdef CONFIG_IDF_TARGET_ESP32S3
    // no variants for now
#endif  // CONFIG_IDF_TARGET_ESP32S3
    return F("ESP32-S3");                                  // Max 240MHz, Dual core, QFN 7*7, ESP32-S3-WROOM-1, ESP32-S3-DevKitC-1
  }
  else if (5 == chip_model) {  // ESP32-C3
#ifdef CONFIG_IDF_TARGET_ESP32C3
/* esptool:
    def get_pkg_version(self):
        num_word = 3
        block1_addr = self.EFUSE_BASE + 0x044
        word3 = self.read_reg(block1_addr + (4 * num_word))
        pkg_version = (word3 >> 21) & 0x0F
        return pkg_version
*/
    uint32_t chip_ver = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_3_REG, EFUSE_PKG_VERSION);
    uint32_t pkg_version = chip_ver & 0x7;
//    uint32_t pkg_version = esp_efuse_get_pkg_ver();

//    AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("HDW: ESP32 Model %d, Revision %d, Core %d, Package %d"), chip_info.model, chip_revision, chip_info.cores, chip_ver);

    switch (pkg_version) {
      case 0:              return F("ESP32-C3");           // Max 160MHz, Single core, QFN 5*5, ESP32-C3-WROOM-02, ESP32-C3-DevKitC-02
      case 1:              return F("ESP32-C3FH4");        // Max 160MHz, Single core, QFN 5*5, 4MB embedded flash, ESP32-C3-MINI-1, ESP32-C3-DevKitM-1
    }
#endif  // CONFIG_IDF_TARGET_ESP32C3
    return F("ESP32-C3");
  }
  else if (6 == chip_model) {  // ESP32-S3(beta3)
    return F("ESP32-S3");
  }
  else if (7 == chip_model) {  // ESP32-C6(beta)
#ifdef CONFIG_IDF_TARGET_ESP32C6
/* esptool:
    def get_pkg_version(self):
        num_word = 3
        block1_addr = self.EFUSE_BASE + 0x044
        word3 = self.read_reg(block1_addr + (4 * num_word))
        pkg_version = (word3 >> 21) & 0x0F
        return pkg_version
*/
    uint32_t chip_ver = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_3_REG, EFUSE_PKG_VERSION);
    uint32_t pkg_version = chip_ver & 0x7;
//    uint32_t pkg_version = esp_efuse_get_pkg_ver();

//    AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("HDW: ESP32 Model %d, Revision %d, Core %d, Package %d"), chip_info.model, chip_revision, chip_info.cores, chip_ver);

    switch (pkg_version) {
      case 0:              return F("ESP32-C6");
    }
#endif  // CONFIG_IDF_TARGET_ESP32C6
    return F("ESP32-C6");
  }
  else if (10 == chip_model) {  // ESP32-H2
#ifdef CONFIG_IDF_TARGET_ESP32H2
/* esptool:
    def get_pkg_version(self):
        num_word = 3
        block1_addr = self.EFUSE_BASE + 0x044
        word3 = self.read_reg(block1_addr + (4 * num_word))
        pkg_version = (word3 >> 21) & 0x0F
        return pkg_version
*/
    uint32_t chip_ver = REG_GET_FIELD(EFUSE_RD_MAC_SPI_SYS_3_REG, EFUSE_PKG_VERSION);
    uint32_t pkg_version = chip_ver & 0x7;
//    uint32_t pkg_version = esp_efuse_get_pkg_ver();

//    AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("HDW: ESP32 Model %d, Revision %d, Core %d, Package %d"), chip_info.model, chip_revision, chip_info.cores, chip_ver);

    switch (pkg_version) {
      case 0:              return F("ESP32-H2");
    }
#endif  // CONFIG_IDF_TARGET_ESP32H2
    return F("ESP32-H2");
  }
  return F("ESP32");
}

String GetDeviceHardwareRevision(void) {
  // ESP32-S2
  // ESP32-D0WDQ6 rev.1
  // ESP32-C3 rev.2
  // ESP32-C3 rev.3
  String result = GetDeviceHardware();   // ESP32-C3

  esp_chip_info_t chip_info;
  esp_chip_info(&chip_info);
  char revision[10] = { 0 };
  if (chip_info.revision) {
    snprintf_P(revision, sizeof(revision), PSTR(" rev.%d"), chip_info.revision);
  }
  result += revision;                    // ESP32-C3 rev.3

  return result;
}

/*
 * ESP32 v1 and v2 needs some special patches to use PSRAM.
 * Standard Tasmota 32 do not include those patches.
 * If using ESP32 v1, please add: `-mfix-esp32-psram-cache-issue -lc-psram-workaround -lm-psram-workaround`
 *
 * This function returns true if the chip supports PSRAM natively (v3) or if the
 * patches are present.
 */
bool CanUsePSRAM(void) {
  if (!FoundPSRAM()) return false;
#ifdef HAS_PSRAM_FIX
  return true;
#endif
#ifdef CONFIG_IDF_TARGET_ESP32
  esp_chip_info_t chip_info;
  esp_chip_info(&chip_info);
  if ((CHIP_ESP32 == chip_info.model) && (chip_info.revision < 3)) {
    return false;
  }
#if ESP_IDF_VERSION_MAJOR < 4
  uint32_t chip_ver = REG_GET_FIELD(EFUSE_BLK0_RDATA3_REG, EFUSE_RD_CHIP_VER_PKG);
  uint32_t pkg_version = chip_ver & 0x7;
  if ((CHIP_ESP32 == chip_info.model) && (pkg_version >= 6)) {
    return false;   // support for embedded PSRAM of ESP32-PICO-V3-02 requires esp-idf 4.4
  }
#endif // ESP_IDF_VERSION_MAJOR < 4

#endif // CONFIG_IDF_TARGET_ESP32
  return true;
}

#endif  // ESP32

/*********************************************************************************************\
 * ESP Support
\*********************************************************************************************/

uint32_t ESP_getFreeHeap1024(void) {
  return ESP_getFreeHeap() / 1024;
}
/*
float ESP_getFreeHeap1024(void) {
  return ((float)ESP_getFreeHeap()) / 1024;
}
*/

/*********************************************************************************************\
 * High entropy hardware random generator
 * Thanks to DigitalAlchemist
\*********************************************************************************************/
// Based on code from https://raw.githubusercontent.com/espressif/esp-idf/master/components/esp32/hw_random.c
uint32_t HwRandom(void) {
#if ESP8266
  // https://web.archive.org/web/20160922031242/http://esp8266-re.foogod.com/wiki/Random_Number_Generator
  #define _RAND_ADDR 0x3FF20E44UL
#endif  // ESP8266
#ifdef ESP32
  #define _RAND_ADDR 0x3FF75144UL
#endif  // ESP32
  static uint32_t last_ccount = 0;
  uint32_t ccount;
  uint32_t result = 0;
  do {
    ccount = ESP.getCycleCount();
    result ^= *(volatile uint32_t *)_RAND_ADDR;
  } while (ccount - last_ccount < 64);
  last_ccount = ccount;
  return result ^ *(volatile uint32_t *)_RAND_ADDR;
#undef _RAND_ADDR
}