Marlin_Firmware/Marlin/src/HAL/SpiEeprom.cpp

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/**
* Marlin 3D Printer Firmware
* Copyright (C) 2016 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/>.
*
*/
/**
* Description: functions for SPI connected external EEPROM.
* Not platform dependent.
*/
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#include "../inc/MarlinConfig.h"
#if ENABLED(SPI_EEPROM)
#include "HAL.h"
#define CMD_WREN 6 // WREN
#define CMD_READ 2 // WRITE
#define CMD_WRITE 2 // WRITE
uint8_t eeprom_read_byte(uint8_t* pos) {
uint8_t v;
uint8_t eeprom_temp[3];
// set read location
// begin transmission from device
eeprom_temp[0] = CMD_READ;
eeprom_temp[1] = ((unsigned)pos>>8) & 0xFF; // addr High
eeprom_temp[2] = (unsigned)pos& 0xFF; // addr Low
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WRITE(SPI_EEPROM1_CS, HIGH);
WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
v = spiRec(SPI_CHAN_EEPROM1);
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WRITE(SPI_EEPROM1_CS, HIGH);
return v;
}
void eeprom_read_block(void* dest, const void* eeprom_address, size_t n) {
uint8_t eeprom_temp[3];
// set read location
// begin transmission from device
eeprom_temp[0] = CMD_READ;
eeprom_temp[1] = ((unsigned)eeprom_address>>8) & 0xFF; // addr High
eeprom_temp[2] = (unsigned)eeprom_address& 0xFF; // addr Low
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WRITE(SPI_EEPROM1_CS, HIGH);
WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
uint8_t *p_dest = (uint8_t *)dest;
while (n--)
*p_dest++ = spiRec(SPI_CHAN_EEPROM1);
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WRITE(SPI_EEPROM1_CS, HIGH);
}
void eeprom_write_byte(uint8_t* pos, uint8_t value) {
uint8_t eeprom_temp[3];
/*write enable*/
eeprom_temp[0] = CMD_WREN;
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WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 1);
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WRITE(SPI_EEPROM1_CS, HIGH);
delay(1);
/*write addr*/
eeprom_temp[0] = CMD_WRITE;
eeprom_temp[1] = ((unsigned)pos>>8) & 0xFF; //addr High
eeprom_temp[2] = (unsigned)pos & 0xFF; //addr Low
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WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
spiSend(SPI_CHAN_EEPROM1, value);
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WRITE(SPI_EEPROM1_CS, HIGH);
delay(7); // wait for page write to complete
}
void eeprom_update_block(const void* src, void* eeprom_address, size_t n) {
uint8_t eeprom_temp[3];
/*write enable*/
eeprom_temp[0] = CMD_WREN;
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WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 1);
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WRITE(SPI_EEPROM1_CS, HIGH);
delay(1);
/*write addr*/
eeprom_temp[0] = CMD_WRITE;
eeprom_temp[1] = ((unsigned)eeprom_address>>8) & 0xFF; //addr High
eeprom_temp[2] = (unsigned)eeprom_address & 0xFF; //addr Low
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WRITE(SPI_EEPROM1_CS, LOW);
spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
spiSend(SPI_CHAN_EEPROM1, (const uint8_t*)src, n);
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WRITE(SPI_EEPROM1_CS, HIGH);
delay(7); // wait for page write to complete
}
#endif // ENABLED(SPI_EEPROM)