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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 SPI EEPROM.
- * Enable USE_SHARED_EEPROM if not supplied by the framework.
- */
-
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(SPI_EEPROM)
-
- #include "eeprom_if.h"
-
- void eeprom_init() {}
-
- #if ENABLED(USE_SHARED_EEPROM)
-
- #define CMD_WREN 6 // WREN
- #define CMD_READ 2 // WRITE
- #define CMD_WRITE 2 // WRITE
-
- #ifndef EEPROM_WRITE_DELAY
- #define EEPROM_WRITE_DELAY 7
- #endif
-
- static void _eeprom_begin(uint8_t * const pos, const uint8_t cmd) {
- const uint8_t eeprom_temp[3] = {
- cmd,
- (unsigned(pos) >> 8) & 0xFF, // Address High
- unsigned(pos) & 0xFF // Address Low
- };
- WRITE(SPI_EEPROM1_CS_PIN, HIGH); // Usually free already
- WRITE(SPI_EEPROM1_CS_PIN, LOW); // Activate the Bus
- spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
- // Leave the Bus in-use
- }
-
- uint8_t eeprom_read_byte(uint8_t *pos) {
- _eeprom_begin(pos, CMD_READ); // Set read location and begin transmission
-
- const uint8_t v = spiRec(SPI_CHAN_EEPROM1); // After READ a value sits on the Bus
-
- WRITE(SPI_EEPROM1_CS_PIN, HIGH); // Done with device
-
- return v;
- }
-
- void eeprom_write_byte(uint8_t *pos, uint8_t value) {
- const uint8_t eeprom_temp = CMD_WREN;
- WRITE(SPI_EEPROM1_CS_PIN, LOW);
- spiSend(SPI_CHAN_EEPROM1, &eeprom_temp, 1); // Write Enable
-
- WRITE(SPI_EEPROM1_CS_PIN, HIGH); // Done with the Bus
- delay(1); // For a small amount of time
-
- _eeprom_begin(pos, CMD_WRITE); // Set write address and begin transmission
-
- spiSend(SPI_CHAN_EEPROM1, value); // Send the value to be written
- WRITE(SPI_EEPROM1_CS_PIN, HIGH); // Done with the Bus
- delay(EEPROM_WRITE_DELAY); // Give page write time to complete
- }
-
- #endif // USE_SHARED_EEPROM
- #endif // I2C_EEPROM
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