1 files changed, 87 insertions, 0 deletions
diff --git a/Marlin/src/HAL/shared/eeprom_if_spi.cpp b/Marlin/src/HAL/shared/eeprom_if_spi.cpp
new file mode 100644
index 0000000..a341fef
--- /dev/null
+++ b/Marlin/src/HAL/shared/eeprom_if_spi.cpp
@@ -0,0 +1,87 @@
+/**
+ * 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
+
+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
+  WRITE(SPI_EEPROM1_CS, HIGH);
+  WRITE(SPI_EEPROM1_CS, LOW);
+  spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
+
+  v = spiRec(SPI_CHAN_EEPROM1);
+  WRITE(SPI_EEPROM1_CS, HIGH);
+  return v;
+}
+
+void eeprom_write_byte(uint8_t* pos, uint8_t value) {
+  uint8_t eeprom_temp[3];
+
+  /*write enable*/
+  eeprom_temp[0] = CMD_WREN;
+  WRITE(SPI_EEPROM1_CS, LOW);
+  spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 1);
+  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
+  WRITE(SPI_EEPROM1_CS, LOW);
+  spiSend(SPI_CHAN_EEPROM1, eeprom_temp, 3);
+
+  spiSend(SPI_CHAN_EEPROM1, value);
+  WRITE(SPI_EEPROM1_CS, HIGH);
+  delay(EEPROM_WRITE_DELAY);   // wait for page write to complete
+}
+
+#endif // USE_SHARED_EEPROM
+#endif // I2C_EEPROM