muele-marlin/Marlin/src/core/utility.h

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2019 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * 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/>.
 *
 */
#pragma once

#include "../inc/MarlinConfigPre.h"

constexpr char axis_codes[XYZE] = { 'X', 'Y', 'Z', 'E' };

// Delay that ensures heaters and watchdog are kept alive
void safe_delay(millis_t ms);

// A delay to provide brittle hosts time to receive bytes
inline void serial_delay(const millis_t ms) {
  #if ENABLED(SERIAL_OVERRUN_PROTECTION)
    safe_delay(ms);
  #else
    UNUSED(ms);
  #endif
}

#if EITHER(EEPROM_SETTINGS, SD_FIRMWARE_UPDATE)
  void crc16(uint16_t *crc, const void * const data, uint16_t cnt);
#endif

#if EITHER(AUTO_BED_LEVELING_UBL, G26_MESH_VALIDATION)
  /**
   * These support functions allow the use of large bit arrays of flags that take very
   * little RAM. Currently they are limited to being 16x16 in size. Changing the declaration
   * to unsigned long will allow us to go to 32x32 if higher resolution Mesh's are needed
   * in the future.
   */
  FORCE_INLINE void bitmap_clear(uint16_t bits[16], const uint8_t x, const uint8_t y)  { CBI(bits[y], x); }
  FORCE_INLINE void bitmap_set(uint16_t bits[16], const uint8_t x, const uint8_t y)    { SBI(bits[y], x); }
  FORCE_INLINE bool is_bitmap_set(uint16_t bits[16], const uint8_t x, const uint8_t y) { return TEST(bits[y], x); }
#endif

#if ENABLED(DEBUG_LEVELING_FEATURE)
  void log_machine_info();
#else
  #define log_machine_info() NOOP
#endif

template<typename T>
class restorer {
  T& ref_;
  T  val_;
public:
  restorer(T& perm) : ref_(perm), val_(perm) {}
  restorer(T& perm, T temp_val) : ref_(perm), val_(perm) { perm = temp_val; }
  ~restorer() { restore(); }
  inline void restore() { ref_ = val_; }
};

#define REMEMBER(N,X, ...) restorer<typeof(X)> restorer_##N(X, ##__VA_ARGS__)
#define RESTORE(N) restorer_##N.restore()

// Converts from an uint8_t in the range of 0-255 to an uint8_t
// in the range 0-100 while avoiding rounding artifacts
constexpr uint8_t ui8_to_percent(const uint8_t i) { return (int(i) * 100 + 127) / 255; }
constexpr uint8_t all_on = 0xFF, all_off = 0x00;