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- /**
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 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 <https://www.gnu.org/licenses/>.
- *
- */
-
- /**
- * Platform-independent Arduino functions for I2C EEPROM.
- * Enable USE_SHARED_EEPROM if not supplied by the framework.
- */
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(I2C_EEPROM)
-
- #include "eeprom_if.h"
-
- #if ENABLED(SOFT_I2C_EEPROM)
- #include <SlowSoftWire.h>
- SlowSoftWire Wire = SlowSoftWire(I2C_SDA_PIN, I2C_SCL_PIN, true);
- #else
- #include <Wire.h>
- #endif
-
- void eeprom_init() {
- Wire.begin(
- #if PINS_EXIST(I2C_SCL, I2C_SDA) && DISABLED(SOFT_I2C_EEPROM)
- uint8_t(I2C_SDA_PIN), uint8_t(I2C_SCL_PIN)
- #endif
- );
- }
-
- #if ENABLED(USE_SHARED_EEPROM)
-
- #ifndef EEPROM_WRITE_DELAY
- #define EEPROM_WRITE_DELAY 5
- #endif
- #ifndef EEPROM_DEVICE_ADDRESS
- #define EEPROM_DEVICE_ADDRESS 0x50
- #endif
-
- static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRESS);
-
- // ------------------------
- // Public functions
- // ------------------------
-
- #define SMALL_EEPROM (MARLIN_EEPROM_SIZE <= 2048)
-
- // Combine Address high bits into the device address on <=16Kbit (2K) and >512Kbit (64K) EEPROMs.
- // Note: MARLIN_EEPROM_SIZE is specified in bytes, whereas EEPROM model numbers refer to bits.
- // e.g., The "16" in BL24C16 indicates a 16Kbit (2KB) size.
- static uint8_t _eeprom_calc_device_address(uint8_t * const pos) {
- const unsigned eeprom_address = (unsigned)pos;
- return (SMALL_EEPROM || MARLIN_EEPROM_SIZE > 65536)
- ? uint8_t(eeprom_device_address | ((eeprom_address >> (SMALL_EEPROM ? 8 : 16)) & 0x07))
- : eeprom_device_address;
- }
-
- static void _eeprom_begin(uint8_t * const pos) {
- const unsigned eeprom_address = (unsigned)pos;
- Wire.beginTransmission(_eeprom_calc_device_address(pos));
- if (!SMALL_EEPROM)
- Wire.write(uint8_t((eeprom_address >> 8) & 0xFF)); // Address High, if needed
- Wire.write(uint8_t(eeprom_address & 0xFF)); // Address Low
- }
-
- void eeprom_write_byte(uint8_t *pos, uint8_t value) {
- _eeprom_begin(pos);
- Wire.write(value);
- Wire.endTransmission();
-
- // wait for write cycle to complete
- // this could be done more efficiently with "acknowledge polling"
- delay(EEPROM_WRITE_DELAY);
- }
-
- uint8_t eeprom_read_byte(uint8_t *pos) {
- _eeprom_begin(pos);
- Wire.endTransmission();
- Wire.requestFrom(_eeprom_calc_device_address(pos), (byte)1);
- return Wire.available() ? Wire.read() : 0xFF;
- }
-
- #endif // USE_SHARED_EEPROM
- #endif // I2C_EEPROM
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