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