From e8701195e66f2d27ffe17fb514eae8173795aaf7 Mon Sep 17 00:00:00 2001
From: Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com>
Date: Thu, 4 Mar 2021 22:54:23 +0500
Subject: Initial commit

---
 Marlin/src/HAL/shared/eeprom_api.h | 71 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 Marlin/src/HAL/shared/eeprom_api.h

(limited to 'Marlin/src/HAL/shared/eeprom_api.h')

diff --git a/Marlin/src/HAL/shared/eeprom_api.h b/Marlin/src/HAL/shared/eeprom_api.h
new file mode 100644
index 0000000..6445f7a
--- /dev/null
+++ b/Marlin/src/HAL/shared/eeprom_api.h
@@ -0,0 +1,71 @@
+/**
+ * Marlin 3D Printer Firmware
+ *
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * Copyright (c) 2016 Bob Cousins bobcousins42@googlemail.com
+ * Copyright (c) 2015-2016 Nico Tonnhofer wurstnase.reprap@gmail.com
+ * Copyright (c) 2016 Victor Perez victor_pv@hotmail.com
+ *
+ * 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/>.
+ *
+ */
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "../../libs/crc16.h"
+
+class PersistentStore {
+public:
+
+  // Total available persistent storage space (in bytes)
+  static size_t capacity();
+
+  // Prepare to read or write
+  static bool access_start();
+
+  // Housecleaning after read or write
+  static bool access_finish();
+
+  // Write one or more bytes of data and update the CRC
+  // Return 'true' on write error
+  static bool write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc);
+
+  // Read one or more bytes of data and update the CRC
+  // Return 'true' on read error
+  static bool read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing=true);
+
+  // Write one or more bytes of data
+  // Return 'true' on write error
+  static inline bool write_data(const int pos, const uint8_t* value, const size_t size=sizeof(uint8_t)) {
+    int data_pos = pos;
+    uint16_t crc = 0;
+    return write_data(data_pos, value, size, &crc);
+  }
+
+  // Write a single byte of data
+  // Return 'true' on write error
+  static inline bool write_data(const int pos, const uint8_t value) { return write_data(pos, &value); }
+
+  // Read one or more bytes of data
+  // Return 'true' on read error
+  static inline bool read_data(const int pos, uint8_t* value, const size_t size=1) {
+    int data_pos = pos;
+    uint16_t crc = 0;
+    return read_data(data_pos, value, size, &crc);
+  }
+};
+
+extern PersistentStore persistentStore;
-- 
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