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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"
#include <Wire.h>
#ifdef __STM32F1__
void eeprom_init() { Wire.begin(); }
#else
#ifndef I2C_SDA_PIN
#define I2C_SDA_PIN PB7
#endif
#ifndef I2C_SCL_PIN
#define I2C_SCL_PIN PB6
#endif
void eeprom_init() { Wire.begin((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
// ------------------------
void eeprom_write_byte(uint8_t *pos, unsigned char value) {
const unsigned eeprom_address = (unsigned)pos;
Wire.beginTransmission(eeprom_device_address);
Wire.write(int(eeprom_address >> 8)); // MSB
Wire.write(int(eeprom_address & 0xFF)); // LSB
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) {
const unsigned eeprom_address = (unsigned)pos;
Wire.beginTransmission(eeprom_device_address);
Wire.write(int(eeprom_address >> 8)); // MSB
Wire.write(int(eeprom_address & 0xFF)); // LSB
Wire.endTransmission();
Wire.requestFrom(eeprom_device_address, (byte)1);
return Wire.available() ? Wire.read() : 0xFF;
}
#endif // USE_SHARED_EEPROM
#endif // I2C_EEPROM
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