EEPROM library

libraries/EEPROM/EEPROM.cpp

@@ -0,0 +1,101 @@
+/*
+  EEPROM.cpp - EEPROM library
+  Copyright (c) 2006 David A. Mellis.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+/******************************************************************************
+ * Includes
+ ******************************************************************************/
+
+
+#include "Arduino.h"
+#include "EEPROM.h"
+
+ extern "C" {
+#include "c_types.h"
+#include "ets_sys.h"
+#include "os_type.h"
+#include "osapi.h"
+#include "spi_flash.h"
+}
+
+#define CONFIG_START_SECTOR 0x3C
+#define CONFIG_SECTOR (CONFIG_START_SECTOR + 0)
+#define CONFIG_ADDR (SPI_FLASH_SEC_SIZE * CONFIG_SECTOR)
+
+EEPROMClass::EEPROMClass()
+: _data(0), _size(0)
+{
+}
+
+void EEPROMClass::begin(size_t size)
+{
+    if (size < 0)
+        return;
+    if (size > SPI_FLASH_SEC_SIZE)
+        size = SPI_FLASH_SEC_SIZE;
+
+    _data = new uint8_t[size];
+    _size = size;
+
+    spi_flash_read(CONFIG_ADDR, reinterpret_cast<uint32_t*>(_data), _size);
+}
+
+void EEPROMClass::end()
+{
+    if (!_size)
+        return;
+
+    commit();
+
+    delete[] _data;
+    _data = 0;
+    _size = 0;
+}
+
+
+uint8_t EEPROMClass::read(int address)
+{
+    if (address < 0 || address >= _size)
+        return 0;
+
+    return _data[address];
+}
+
+void EEPROMClass::write(int address, uint8_t value)
+{
+    if (address < 0 || address >= _size)
+        return;
+
+    _data[address] = value;
+    _dirty = true;
+}
+
+void EEPROMClass::commit()
+{
+    if (!_size || !_dirty)
+        return;
+
+    ETS_UART_INTR_DISABLE();
+    spi_flash_erase_sector(CONFIG_SECTOR);
+    spi_flash_write(CONFIG_ADDR, reinterpret_cast<uint32_t*>(_data), _size);
+    ETS_UART_INTR_ENABLE();
+    _dirty = false;
+}
+
+
+EEPROMClass EEPROM;