Merge pull request #176 from spark/feature/flash-eeprom-emulation

Feature/flash eeprom emulation

inc/application.h

@@ -43,5 +43,6 @@
 #include "spark_wiring_tcpserver.h"
 #include "spark_wiring_udp.h"
 #include "spark_wiring_time.h"
+#include "spark_wiring_eeprom.h"
 
 #endif /* APPLICATION_H_ */

inc/spark_wiring_eeprom.h

@@ -0,0 +1,83 @@
+/**
+ ******************************************************************************
+ * @file    spark_wiring_eeprom.h
+ * @author  Satish Nair
+ * @version V1.0.0
+ * @date    10-April-2014
+ * @brief   Functions/Class prototypes for the EEPROM emulation library.
+ ******************************************************************************
+  Copyright (c) 2013-14 Spark Labs, Inc.  All rights 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 3 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, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************
+ */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __SPARK_WIRING_EEPROM_H
+#define __SPARK_WIRING_EEPROM_H
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f10x.h"
+
+/* Internal Flash Page size = 1KByte */
+#define PAGE_SIZE  (uint16_t)0x400
+
+/* EEPROM emulation start address in Flash (just after the write protected bootloader program space) */
+#define EEPROM_START_ADDRESS    ((uint32_t)0x08004000)
+
+/* Pages 0 and 1 base and end addresses */
+#define PAGE0_BASE_ADDRESS      ((uint32_t)(EEPROM_START_ADDRESS + 0x000))
+#define PAGE0_END_ADDRESS       ((uint32_t)(EEPROM_START_ADDRESS + (PAGE_SIZE - 1)))
+
+#define PAGE1_BASE_ADDRESS      ((uint32_t)(EEPROM_START_ADDRESS + PAGE_SIZE))
+#define PAGE1_END_ADDRESS       ((uint32_t)(EEPROM_START_ADDRESS + (2 * PAGE_SIZE - 1)))
+
+/* Used Flash pages for EEPROM emulation */
+#define PAGE0                   ((uint16_t)0x0000)
+#define PAGE1                   ((uint16_t)0x0001)
+
+/* No valid page define */
+#define NO_VALID_PAGE           ((uint16_t)0x00AB)
+
+/* Page status definitions */
+#define ERASED                  ((uint16_t)0xFFFF)     /* PAGE is empty */
+#define RECEIVE_DATA            ((uint16_t)0xEEEE)     /* PAGE is marked to receive data */
+#define VALID_PAGE              ((uint16_t)0x0000)     /* PAGE containing valid data */
+
+/* Valid pages in read and write defines */
+#define READ_FROM_VALID_PAGE    ((uint8_t)0x00)
+#define WRITE_IN_VALID_PAGE     ((uint8_t)0x01)
+
+/* Page full define */
+#define PAGE_FULL               ((uint8_t)0x80)
+
+/* EEPROM Emulation Size */
+#define EEPROM_SIZE             ((uint8_t)0x64)       /* 100 bytes (Max 255/0xFF bytes) */
+
+uint16_t EEPROM_Init(void);
+uint16_t EEPROM_ReadVariable(uint16_t EepromAddress, uint16_t *EepromData);
+uint16_t EEPROM_WriteVariable(uint16_t EepromAddress, uint16_t EepromData);
+
+/* Arduino Compatibility Class -----------------------------------------------*/
+class EEPROMClass
+{
+  public:
+    EEPROMClass();
+    uint8_t read(int);
+    void write(int, uint8_t);
+};
+
+extern EEPROMClass EEPROM;
+
+#endif /* __SPARK_WIRING_EEPROM_H */

src/build.mk

@@ -18,6 +18,7 @@ CPPSRC += $(TARGET_SRC_PATH)/main.cpp
 CPPSRC += $(TARGET_SRC_PATH)/newlib_stubs.cpp
 CPPSRC += $(TARGET_SRC_PATH)/spark_utilities.cpp
 CPPSRC += $(TARGET_SRC_PATH)/spark_wiring.cpp
+CPPSRC += $(TARGET_SRC_PATH)/spark_wiring_eeprom.cpp
 CPPSRC += $(TARGET_SRC_PATH)/spark_wiring_i2c.cpp
 CPPSRC += $(TARGET_SRC_PATH)/spark_wiring_interrupts.cpp
 CPPSRC += $(TARGET_SRC_PATH)/spark_wiring_ipaddress.cpp