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Storage.cpp
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Storage.cpp
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//
// Lucky Resistor's Data Logger (Simple Version)
// ---------------------------------------------------------------------------
// (c)2015 by Lucky Resistor. See LICENSE for details.
//
// 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 2 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, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#include "Storage.h"
#ifdef LR_STORAGE_FRAM
#include <Wire.h>
#else
#include <EEPROM.h>
#endif
Storage::Storage()
{
}
Storage::~Storage()
{
}
#ifdef LR_STORAGE_FRAM
/// The address of the FRAM chip in the I2C bus.
///
/// The address is 1010AAA where AAA is the custom address which can
/// be set with the pins on the chip.
///
const uint8_t MB85RC_ADDRESS = B1010000;
bool Storage::begin()
{
// Read the manufacturer ID and product ID to make sure the FRAM is available.
Wire.beginTransmission(0xf8>>1);
Wire.write(MB85RC_ADDRESS<<1);
Wire.endTransmission(false);
Wire.requestFrom(0xf8>>1, 3);
const uint8_t id0 = Wire.read();
const uint8_t id1 = Wire.read();
const uint8_t id2 = Wire.read();
const uint16_t manufacturerID = (id0<<4)+(id1>>4);
const uint16_t productID = ((id1&0x0f)<<8)+id2;
// Check the both IDs
if (manufacturerID != 0x00a || productID != 0x510) {
Serial.println("Problem with FRAM: Unknown manufacturer or product ID.");
return false;
}
return true;
}
uint32_t Storage::size()
{
return 32768; // 32KB
}
void Storage::writeByte(uint32_t index, uint8_t data)
{
Wire.beginTransmission(MB85RC_ADDRESS);
Wire.write(index>>8);
Wire.write(index&0xff);
Wire.write(data);
Wire.endTransmission();
}
void Storage::writeBytes(uint32_t firstIndex, const uint8_t *data, uint32_t size)
{
Wire.beginTransmission(MB85RC_ADDRESS);
Wire.write(static_cast<uint8_t>(firstIndex>>8));
Wire.write(static_cast<uint8_t>(firstIndex&0xff));
for (uint32_t i = 0; i < size; ++i) {
Wire.write(data[i]);
}
Wire.endTransmission();
}
uint8_t Storage::readByte(uint32_t index)
{
Wire.beginTransmission(MB85RC_ADDRESS);
Wire.write(static_cast<uint8_t>(index>>8));
Wire.write(static_cast<uint8_t>(index&0xff));
Wire.endTransmission();
Wire.requestFrom(MB85RC_ADDRESS, static_cast<uint8_t>(1));
return Wire.read();
}
void Storage::readBytes(uint32_t firstIndex, uint8_t *data, uint32_t size)
{
// reads >0xff will not work.
Wire.beginTransmission(MB85RC_ADDRESS);
Wire.write(static_cast<uint8_t>(firstIndex>>8));
Wire.write(static_cast<uint8_t>(firstIndex&0xff));
Wire.endTransmission();
Wire.requestFrom(MB85RC_ADDRESS, static_cast<uint8_t>(size));
for (uint32_t i = 0; i < size; ++i) {
data[i] = Wire.read();
}
}
#else
bool Storage::begin()
{
// nothing required for EEPROM.
return true; // Success
}
uint32_t Storage::size()
{
return EEPROM.length();
}
void Storage::writeByte(uint32_t index, uint8_t data)
{
EEPROM.update(index, data);
}
void Storage::writeBytes(uint32_t firstIndex, const uint8_t *data, uint32_t size)
{
for (uint32_t i = 0; i < size; ++i) {
writeByte(firstIndex + i, data[i]);
}
}
uint8_t Storage::readByte(uint32_t index)
{
return EEPROM.read(index);
}
void Storage::readBytes(uint32_t firstIndex, uint8_t *data, uint32_t size)
{
for (uint32_t i = 0; i < size; ++i) {
data[i] = readByte(firstIndex + i);
}
}
#endif