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129 lines
3.9 KiB
129 lines
3.9 KiB
/**
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* Marlin 3D Printer Firmware
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* Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
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*
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* Based on Sprinter and grbl.
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* Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* Description: functions for I2C connected external EEPROM.
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* Not platform dependent.
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*
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* TODO: Some platform Arduino libraries define these functions
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* so Marlin needs to add a glue layer to prevent the conflict.
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*/
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#include "../../inc/MarlinConfig.h"
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#if ENABLED(I2C_EEPROM)
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#include "../HAL.h"
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#include <Wire.h>
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#ifndef EEPROM_WRITE_DELAY
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#define EEPROM_WRITE_DELAY 5
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#endif
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// ------------------------
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// Private Variables
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// ------------------------
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#ifndef EEPROM_DEVICE_ADDRESS
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#define EEPROM_DEVICE_ADDRESS 0x50
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#endif
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static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRESS);
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// ------------------------
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// Public functions
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// ------------------------
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static void eeprom_init() { Wire.begin(); }
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void eeprom_write_byte(uint8_t *pos, unsigned char value) {
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const unsigned eeprom_address = (unsigned)pos;
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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Wire.write(value);
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Wire.endTransmission();
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// wait for write cycle to complete
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// this could be done more efficiently with "acknowledge polling"
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delay(EEPROM_WRITE_DELAY);
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}
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// WARNING: address is a page address, 6-bit end will wrap around
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// also, data can be maximum of about 30 bytes, because the Wire library has a buffer of 32 bytes
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void eeprom_update_block(const void *pos, void *__dst, size_t n) {
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const unsigned eeprom_address = (unsigned)__dst;
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eeprom_init();
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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Wire.endTransmission();
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uint8_t *ptr = (uint8_t*)pos;
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uint8_t flag = 0;
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Wire.requestFrom(eeprom_device_address, (byte)n);
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for (byte c = 0; c < n && Wire.available(); c++)
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flag |= Wire.read() ^ ptr[c];
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if (flag) {
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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Wire.write((uint8_t*)pos, n);
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Wire.endTransmission();
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// wait for write cycle to complete
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// this could be done more efficiently with "acknowledge polling"
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delay(EEPROM_WRITE_DELAY);
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}
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}
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uint8_t eeprom_read_byte(uint8_t *pos) {
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const unsigned eeprom_address = (unsigned)pos;
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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Wire.endTransmission();
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Wire.requestFrom(eeprom_device_address, (byte)1);
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return Wire.available() ? Wire.read() : 0xFF;
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}
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// Don't read more than 30..32 bytes at a time!
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void eeprom_read_block(void* pos, const void *__dst, size_t n) {
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const unsigned eeprom_address = (unsigned)__dst;
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eeprom_init();
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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Wire.endTransmission();
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Wire.requestFrom(eeprom_device_address, (byte)n);
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for (byte c = 0; c < n; c++ )
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if (Wire.available()) *((uint8_t*)pos + c) = Wire.read();
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}
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#endif // I2C_EEPROM
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