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/SAMD51/eeprom_flash.cpp | 95 ++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 Marlin/src/HAL/SAMD51/eeprom_flash.cpp

(limited to 'Marlin/src/HAL/SAMD51/eeprom_flash.cpp')

diff --git a/Marlin/src/HAL/SAMD51/eeprom_flash.cpp b/Marlin/src/HAL/SAMD51/eeprom_flash.cpp
new file mode 100644
index 0000000..871bf22
--- /dev/null
+++ b/Marlin/src/HAL/SAMD51/eeprom_flash.cpp
@@ -0,0 +1,95 @@
+/**
+ * Marlin 3D Printer Firmware
+ *
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ * SAMD51 HAL developed by Giuliano Zaro (AKA GMagician)
+ *
+ * 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/>.
+ *
+ */
+#ifdef __SAMD51__
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(FLASH_EEPROM_EMULATION)
+
+#include "../shared/eeprom_api.h"
+
+#define NVMCTRL_CMD(c)    do{                                                 \
+                            SYNC(!NVMCTRL->STATUS.bit.READY);                 \
+                            NVMCTRL->INTFLAG.bit.DONE = true;                 \
+                            NVMCTRL->CTRLB.reg = c | NVMCTRL_CTRLB_CMDEX_KEY; \
+                            SYNC(NVMCTRL->INTFLAG.bit.DONE);                  \
+                          }while(0)
+#define NVMCTRL_FLUSH()   do{                                           \
+                            if (NVMCTRL->SEESTAT.bit.LOAD)              \
+                              NVMCTRL_CMD(NVMCTRL_CTRLB_CMD_SEEFLUSH);  \
+                          }while(0)
+
+size_t PersistentStore::capacity() {
+  const uint8_t psz = NVMCTRL->SEESTAT.bit.PSZ,
+                sblk = NVMCTRL->SEESTAT.bit.SBLK;
+
+  return   (!psz && !sblk)         ? 0
+         : (psz <= 2)              ? (0x200 << psz)
+         : (sblk == 1 || psz == 3) ?  4096
+         : (sblk == 2 || psz == 4) ?  8192
+         : (sblk <= 4 || psz == 5) ? 16384
+         : (sblk >= 9 && psz == 7) ? 65536
+                                   : 32768;
+}
+
+bool PersistentStore::access_start() {
+  NVMCTRL->SEECFG.reg = NVMCTRL_SEECFG_WMODE_BUFFERED;  // Buffered mode and segment reallocation active
+  if (NVMCTRL->SEESTAT.bit.RLOCK)
+    NVMCTRL_CMD(NVMCTRL_CTRLB_CMD_USEE);    // Unlock E2P data write access
+  return true;
+}
+
+bool PersistentStore::access_finish() {
+  NVMCTRL_FLUSH();
+  if (!NVMCTRL->SEESTAT.bit.LOCK)
+    NVMCTRL_CMD(NVMCTRL_CTRLB_CMD_LSEE);    // Lock E2P data write access
+  return true;
+}
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  while (size--) {
+    const uint8_t v = *value;
+    SYNC(NVMCTRL->SEESTAT.bit.BUSY);
+    if (NVMCTRL->INTFLAG.bit.SEESFULL)
+      NVMCTRL_FLUSH();      // Next write will trigger a sector reallocation. I need to flush 'pagebuffer'
+    ((volatile uint8_t *)SEEPROM_ADDR)[pos] = v;
+    SYNC(!NVMCTRL->INTFLAG.bit.SEEWRC);
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t *value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  while (size--) {
+    SYNC(NVMCTRL->SEESTAT.bit.BUSY);
+    uint8_t c = ((volatile uint8_t *)SEEPROM_ADDR)[pos];
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+#endif // FLASH_EEPROM_EMULATION
+#endif // __SAMD51__
-- 
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