STM32F1 HAL

Adding files for STM32F1 HAL based on libmaple/stm32duino core.
Current persistent_store uses cardreader changes to be sent in separate
commit, but could be changed to use i2c eeprom.

Marlin/src/HAL/HAL_STM32F1/persistent_store_impl.cpp

@@ -0,0 +1,98 @@
+/**
+ * Marlin 3D Printer Firmware
+ *
+ * Copyright (C) 2016 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/>.
+ *
+ */
+
+/**
+ * HAL for stm32duino.com based on Libmaple and compatible (STM32F1)
+ */
+
+#ifdef __STM32F1__
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(EEPROM_SETTINGS)
+
+#include "../persistent_store_api.h"
+
+//#include "../../core/types.h"
+//#include "../../core/language.h"
+//#include "../../core/serial.h"
+//#include "../../core/utility.h"
+
+#include "../../sd/cardreader.h"
+
+
+namespace HAL {
+namespace PersistentStore {
+
+#define CONFIG_FILE_NAME "eeprom.dat"
+#define HAL_STM32F1_EEPROM_SIZE 4096
+char HAL_STM32F1_eeprom_content[HAL_STM32F1_EEPROM_SIZE];
+
+bool access_start() {
+	if (!card.cardOK) return false;
+	int16_t bytes_read = 0;
+	const char eeprom_zero = 0xFF;
+	card.openFile((char *)CONFIG_FILE_NAME,true);
+	bytes_read = card.read (HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
+	if (bytes_read == -1) return false;
+	for (; bytes_read < HAL_STM32F1_EEPROM_SIZE; bytes_read++) {
+		HAL_STM32F1_eeprom_content[bytes_read] = eeprom_zero;
+	}
+	card.closefile();
+	return true;
+}
+
+
+bool access_finish(){
+	if (!card.cardOK) return false;
+	int16_t bytes_written = 0;
+	card.openFile((char *)CONFIG_FILE_NAME,true);
+	bytes_written = card.write (HAL_STM32F1_eeprom_content, HAL_STM32F1_EEPROM_SIZE);
+	card.closefile();
+	return (bytes_written == HAL_STM32F1_EEPROM_SIZE);
+}
+
+bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
+	for (int i = 0; i < size; i++) {
+		HAL_STM32F1_eeprom_content [pos + i] = value[i];
+	}
+	crc16(crc, value, size);
+	pos += size;
+	return true;
+}
+
+void read_data(int &pos, uint8_t* value, uint16_t size, uint16_t *crc) {
+	for (int i = 0; i < size; i++) {
+		value[i] = HAL_STM32F1_eeprom_content [pos + i];
+	}
+	crc16(crc, value, size);
+	pos += size;
+}
+
+} // PersistentStore::
+} // HAL::
+
+#endif // EEPROM_SETTINGS
+
+#endif // __STM32F1__
+