core.cpp

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#ifdef USE_ESP8266
 
#include "core.h"
#include "esphome/core/defines.h"
#include "esphome/core/hal.h"
#include <Arduino.h>
 
namespace esphome {
 
// HAL functions live in hal.cpp. This file keeps only the ESP8266-specific
// firmware bootstrap (Tasmota OTA magic bytes, optional GPIO pre-init).
 
void force_link_symbols() {
  // Tasmota uses magic bytes in the binary to check if an OTA firmware is compatible
  // with their settings - ESPHome uses a different settings system (that can also survive
  // erases). So set magic bytes indicating all tasmota versions are supported.
  // This only adds 12 bytes of binary size, which is an acceptable price to pay for easier support
  // for Tasmota.
  // https://github.com/arendst/Tasmota/blob/b05301b1497942167a015a6113b7f424e42942cd/tasmota/settings.ino#L346-L380
  // https://github.com/arendst/Tasmota/blob/b05301b1497942167a015a6113b7f424e42942cd/tasmota/i18n.h#L652-L654
  const static uint32_t TASMOTA_MAGIC_BYTES[] PROGMEM = {0x5AA55AA5, 0xFFFFFFFF, 0xA55AA55A};
  // Force link symbol by using a volatile integer (GCC attribute used does not work because of LTO)
  volatile int x = 0;
  x = TASMOTA_MAGIC_BYTES[x];
}
 
extern "C" void resetPins() {  // NOLINT
  // Added in framework 2.7.0
  // usually this sets up all pins to be in INPUT mode
  // however, not strictly needed as we set up the pins properly
  // ourselves and this causes pins to toggle during reboot.
  force_link_symbols();
 
#ifdef USE_ESP8266_EARLY_PIN_INIT
  for (int i = 0; i < 16; i++) {
    uint8_t mode = progmem_read_byte(&ESPHOME_ESP8266_GPIO_INITIAL_MODE[i]);
    uint8_t level = progmem_read_byte(&ESPHOME_ESP8266_GPIO_INITIAL_LEVEL[i]);
    if (mode != 255)
      pinMode(i, mode);  // NOLINT
    if (level != 255)
      digitalWrite(i, level);  // NOLINT
  }
#endif
}
 
}  // namespace esphome
 
#endif  // USE_ESP8266