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IO_ExampleSerial.h
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IO_ExampleSerial.h
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/*
* © 2021, 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/>.
*/
/*
* To declare a device instance,
* IO_ExampleSerial myDevice(1000, 10, Serial3, 9600);
* or to create programmatically,
* IO_ExampleSerial::create(1000, 10, Serial3, 9600);
*
* (uses VPINs 1000-1009, talke on Serial 3 at 9600 baud.)
*
* See IO_ExampleSerial.cpp for the protocol used over the serial line.
*
*/
#ifndef IO_EXAMPLESERIAL_H
#define IO_EXAMPLESERIAL_H
#include "IODevice.h"
class IO_ExampleSerial : public IODevice {
private:
// Here we define the device-specific variables.
HardwareSerial *_serial;
uint8_t _inputState = 0;
int _inputIndex = 0;
int _inputValue = 0;
uint16_t *_pinValues; // Pointer to block of memory containing pin values
unsigned long _baud;
public:
// Static function to handle "IO_ExampleSerial::create(...)" calls.
static void create(VPIN firstVpin, int nPins, HardwareSerial *serial, unsigned long baud) {
if (checkNoOverlap(firstVpin,nPins)) new IO_ExampleSerial(firstVpin, nPins, serial, baud);
}
protected:
// Constructor. This should initialise variables etc. but not call other objects yet
// (e.g. Serial, I2CManager, and other parts of the CS functionality).
// defer those until the _begin() function. The 'addDevice' call is required unless
// the device is not to be added (e.g. because of incorrect parameters).
IO_ExampleSerial(VPIN firstVpin, int nPins, HardwareSerial *serial, unsigned long baud) {
_firstVpin = firstVpin;
_nPins = nPins;
_pinValues = (uint16_t *)calloc(_nPins, sizeof(uint16_t));
_baud = baud;
// Save reference to serial port driver
_serial = serial;
addDevice(this);
}
// Device-specific initialisation
void _begin() override {
_serial->begin(_baud);
#if defined(DIAG_IO)
_display();
#endif
// Send a few # characters to the output
for (uint8_t i=0; i<3; i++)
_serial->write('#');
}
// Device-specific write function. Write a string in the form "#Wm,n#"
// where m is the vpin number, and n is the value.
void _write(VPIN vpin, int value) {
int pin = vpin -_firstVpin;
#ifdef DIAG_IO
DIAG(F("IO_ExampleSerial::_write VPIN:%u Value:%d"), (int)vpin, value);
#endif
// Send a command string over the serial line
_serial->print('#');
_serial->print('W');
_serial->print(pin);
_serial->print(',');
_serial->print(value);
_serial->println('#');
DIAG(F("ExampleSerial Sent command, p1=%d, p2=%d"), vpin, value);
}
// Device-specific read function.
int _read(VPIN vpin) {
// Return a value for the specified vpin.
int result = _pinValues[vpin-_firstVpin];
return result;
}
// Loop function to do background scanning of the input port. State
// machine parses the incoming command as it is received. Command
// is in the form "#Nm,n#" where m is the index and n is the value.
void _loop(unsigned long currentMicros) {
(void)currentMicros; // Suppress compiler warnings
if (_serial->available()) {
// Input data available to read. Read a character.
char c = _serial->read();
switch (_inputState) {
case 0: // Waiting for start of command
if (c == '#') // Start of command received.
_inputState = 1;
break;
case 1: // Expecting command character
if (c == 'N') { // 'Notify' character received
_inputState = 2;
_inputValue = _inputIndex = 0;
} else
_inputState = 0; // Unexpected char, reset
break;
case 2: // reading first parameter (index)
if (isdigit(c))
_inputIndex = _inputIndex * 10 + (c-'0');
else if (c==',')
_inputState = 3;
else
_inputState = 0; // Unexpected char, reset
break;
case 3: // reading reading second parameter (value)
if (isdigit(c))
_inputValue = _inputValue * 10 - (c-'0');
else if (c=='#') { // End of command
// Complete command received, do something with it.
DIAG(F("ExampleSerial Received command, p1=%d, p2=%d"), _inputIndex, _inputValue);
if (_inputIndex >= 0 && _inputIndex < _nPins) { // Store value
_pinValues[_inputIndex] = _inputValue;
}
_inputState = 0; // Done, start again.
} else
_inputState = 0; // Unexpected char, reset
break;
}
}
}
// Display information about the device, and perhaps its current condition (e.g. active, disabled etc).
// Here we display the current values held for the pins.
void _display() {
DIAG(F("IO_ExampleSerial Configured on Vpins:%u-%u"), (int)_firstVpin,
(int)_firstVpin+_nPins-1);
for (int i=0; i<_nPins; i++)
DIAG(F(" VPin %2u: %d"), _firstVpin+i, _pinValues[i]);
}
};
#endif // IO_EXAMPLESERIAL_H