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Neil McKechnie 2023-02-28 20:09:37 +00:00
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IO_ExternalEEPROM.h
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/*
* © 2023, Neil McKechnie. All rights reserved.
*
* This file is part of DCC++EX API
*
* This 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.
*
* It 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 CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
/*
* This device driver monitors the state of turnout objects and writes updates,
* on change of state, to an external 24C128 (16kByte) or 24C256 (32kByte)
* EEPROM device connected via I2C.
*
* When the device is restarted, it repositions the turnouts in accordance
* with the last saved position.
*
* To create a device instance,
* IO_ExternalEEPROM::create(0, 0, i2cAddress);
*
*
*/
#ifndef IO_EXTERNALEEPROM_H
#define IO_EXTERNALEEPROM_H
#include "IODevice.h"
#include "I2CManager.h"
#include "Turnouts.h"
class ExternalEEPROM : public IODevice {
private:
// Here we define the device-specific variables.
int _sizeInKBytes = 128;
Turnout *_turnout = 0;
int _lastTurnoutHash = 0;
I2CRB _rb;
uint8_t _buffer[32]; // 32 is max for Wire write
public:
// Static function to handle "IO_ExampleSerial::create(...)" calls.
static void create(I2CAddress i2cAddress, int sizeInKBytes) {
if (checkNoOverlap(0, 0, i2cAddress)) new ExternalEEPROM(i2cAddress, sizeInKBytes);
}
protected:
// Constructor.
ExternalEEPROM(I2CAddress i2cAddress, int sizeInKBytes) {
_I2CAddress = i2cAddress;
_sizeInKBytes = sizeInKBytes;
// Set up I2C structures.
_rb.setWriteParams(_I2CAddress, _buffer, 32);
addDevice(this);
}
// Device-specific initialisation
void _begin() override {
I2CManager.begin();
I2CManager.setClock(1000000); // Max supported speed
if (I2CManager.exists(_I2CAddress)) {
// Initialise or read contents of EEPROM
// and set turnout states accordingly.
// Read 32 bytes from address 0x0000.
I2CManager.read(_I2CAddress, _buffer, 32, 2, 0, 0);
// Dump data
DIAG(F("EEPROM First 32 bytes:"));
for (int i=0; i<32; i+=8)
DIAG(F("%d: %x %x %x %x %x %x %x %x"),
i, _buffer[i], _buffer[i+1], _buffer[i+2], _buffer[i+3],
_buffer[i+4], _buffer[i+5], _buffer[i+6], _buffer[i+7]);
#if defined(DIAG_IO)
_display();
#endif
} else {
DIAG(F("ExternalEEPROM not found, I2C:%s"), _I2CAddress.toString());
_deviceState = DEVSTATE_FAILED;
}
}
// Loop function to do background scanning of the turnouts
void _loop(unsigned long currentMicros) {
(void)currentMicros; // Suppress compiler warnings
if (_rb.isBusy()) return; // Can't do anything until previous request has completed.
if (_rb.status == I2C_STATUS_NEGATIVE_ACKNOWLEDGE) {
// Device not responding, probably still writing data, so requeue request
I2CManager.queueRequest(&_rb);
return;
}
if (_lastTurnoutHash != Turnout::turnoutlistHash) {
_lastTurnoutHash = Turnout::turnoutlistHash;
// Turnout list has changed, so pointer held from last run may be invalid
_turnout = 0; // Start at the beginning of the list again.
//#if defined(DIAG_IO)
DIAG(F("Turnout Hash Changed!"));
//#endif
}
// Locate next turnout, or first one if there is no current one.
if (_turnout)
_turnout = _turnout->next();
else
_turnout = Turnout::first();
// Retrieve turnout state
int turnoutID = _turnout->getId();
int turnoutState = _turnout->isThrown();
(void)turnoutID; // Suppress compiler warning
(void)turnoutState; // Suppress compiler warning
// TODO: Locate turnoutID in EEPROM (or EEPROM copy) and check if state has changed.
// TODO: If it has, then initiate a write of the updated state to EEPROM
delayUntil(currentMicros+5000); // Write cycle time is 5ms max for FT24C256
}
// Display information about the device.
void _display() {
DIAG(F("ExternalEEPROM %dkBytes I2C:%s %S"), _sizeInKBytes, _I2CAddress.toString(),
_deviceState== DEVSTATE_FAILED ? F("OFFLINE") : F(""));
}
};
#endif // IO_EXTERNALEEPROM_H