QSPI EEPROM for SAMD51 (#17292)

Marlin/src/HAL/STM32F1/eeprom_flash.cpp

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+/**
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * persistent_store_flash.cpp
+ * HAL for stm32duino and compatible (STM32F1)
+ * Implementation of EEPROM settings in SDCard
+ */
+
+#ifdef __STM32F1__
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(FLASH_EEPROM_EMULATION)
+
+#include "../shared/eeprom_api.h"
+
+#include <flash_stm32.h>
+#include <EEPROM.h>
+
+// Store settings in the last two pages
+#define EEPROM_SIZE (EEPROM_PAGE_SIZE * 2)
+#define ACCESS_FINISHED(TF) do{ FLASH_Lock(); eeprom_dirty = false; return TF; }while(0)
+
+static uint8_t ram_eeprom[EEPROM_SIZE] __attribute__((aligned(4))) = {0};
+static bool eeprom_dirty = false;
+
+bool PersistentStore::access_start() {
+  const uint32_t* source = reinterpret_cast<const uint32_t*>(EEPROM_PAGE0_BASE);
+  uint32_t* destination = reinterpret_cast<uint32_t*>(ram_eeprom);
+
+  static_assert(0 == EEPROM_SIZE % 4, "EEPROM_SIZE is corrupted. (Must be a multiple of 4.)"); // Ensure copying as uint32_t is safe
+  constexpr size_t eeprom_size_u32 = EEPROM_SIZE / 4;
+
+  for (size_t i = 0; i < eeprom_size_u32; ++i, ++destination, ++source)
+    *destination = *source;
+
+  eeprom_dirty = false;
+  return true;
+}
+
+bool PersistentStore::access_finish() {
+
+  if (eeprom_dirty) {
+    FLASH_Status status;
+
+    // Instead of erasing all (both) pages, maybe in the loop we check what page we are in, and if the
+    // data has changed in that page. We then erase the first time we "detect" a change. In theory, if
+    // nothing changed in a page, we wouldn't need to erase/write it.
+    // Or, instead of checking at this point, turn eeprom_dirty into an array of bool the size of number
+    // of pages. Inside write_data, we set the flag to true at that time if something in that
+    // page changes...either way, something to look at later.
+    FLASH_Unlock();
+
+    status = FLASH_ErasePage(EEPROM_PAGE0_BASE);
+    if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
+    status = FLASH_ErasePage(EEPROM_PAGE1_BASE);
+    if (status != FLASH_COMPLETE) ACCESS_FINISHED(true);
+
+    const uint16_t *source = reinterpret_cast<const uint16_t*>(ram_eeprom);
+    for (size_t i = 0; i < EEPROM_SIZE; i += 2, ++source) {
+      if (FLASH_ProgramHalfWord(EEPROM_PAGE0_BASE + i, *source) != FLASH_COMPLETE)
+        ACCESS_FINISHED(false);
+    }
+
+    ACCESS_FINISHED(true);
+  }
+
+  return true;
+}
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  for (size_t i = 0; i < size; ++i) ram_eeprom[pos + i] = value[i];
+  eeprom_dirty = true;
+  crc16(crc, value, size);
+  pos += size;
+  return false;  // return true for any error
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t* value, const size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  const uint8_t * const buff = writing ? &value[0] : &ram_eeprom[pos];
+  if (writing) for (size_t i = 0; i < size; i++) value[i] = ram_eeprom[pos + i];
+  crc16(crc, buff, size);
+  pos += size;
+  return false;  // return true for any error
+}
+
+size_t PersistentStore::capacity() { return EEPROM_SIZE; }
+
+#endif // FLASH_EEPROM_EMULATION
+#endif // __STM32F1__