96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/**
|
|
* 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>
|
|
|
|
void eeprom_init() {
|
|
Wire.begin(
|
|
#if PINS_EXIST(I2C_SCL, I2C_SDA)
|
|
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);
|
|
|
|
void _beginTransmission(const uint16_t memoryAddress) {
|
|
if (MARLIN_EEPROM_SIZE > 0x4000) { // Use two-byte addressing for EEPROMs >16kb
|
|
Wire.beginTransmission(eeprom_device_address);
|
|
Wire.write(memoryAddress >> 8); // Address High Byte
|
|
}
|
|
else {
|
|
const uint8_t addr = eeprom_device_address | byte((memoryAddress >> 8) & 0x07);
|
|
Wire.beginTransmission(addr);
|
|
}
|
|
Wire.write(memoryAddress & 0xFF); // Address Low Byte (or only byte for chips <= 16Kb like 24C02/04/08/16)
|
|
}
|
|
|
|
// ------------------------
|
|
// Public functions
|
|
// ------------------------
|
|
|
|
void eeprom_write_byte(uint8_t *pos, unsigned char value) {
|
|
const unsigned eeprom_address = (unsigned)pos;
|
|
|
|
_beginTransmission(eeprom_address);
|
|
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;
|
|
|
|
_beginTransmission(eeprom_address);
|
|
Wire.endTransmission();
|
|
|
|
// For EEPROMs <=16Kb the lower address bits are used for 2Kb page address
|
|
const int addr = eeprom_device_address | (MARLIN_EEPROM_SIZE <= 0x4000 ? byte((eeprom_address >> 8) & 0x07) : byte(0));
|
|
Wire.requestFrom(addr, byte(1));
|
|
return Wire.available() ? Wire.read() : 0xFF;
|
|
}
|
|
|
|
#endif // USE_SHARED_EEPROM
|
|
#endif // I2C_EEPROM
|