mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-30 03:26:13 +01:00
275 lines
8.5 KiB
C++
275 lines
8.5 KiB
C++
/*
|
|
* © 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/>.
|
|
*/
|
|
|
|
/*
|
|
* To define a CMRI bus, example syntax:
|
|
* CMRIbus::create(bus, serial, baud[, cycletime[, pin]]);
|
|
*
|
|
* bus = 0-255
|
|
* serial = serial port to be used (e.g. Serial3)
|
|
* baud = baud rate (9600, 19200, 28800, 57600 or 115200)
|
|
* cycletime = minimum time between successive updates/reads of a node in millisecs (default 500ms)
|
|
* pin = pin number connected to RS485 module's DE and !RE terminals for half-duplex operation (default VPIN_NONE)
|
|
*
|
|
* Each bus must use a different serial port.
|
|
*
|
|
* To define a CMRI node and associate it with a CMRI bus,
|
|
* CMRInode::create(firstVPIN, numVPINs, bus, address, type [, inputs, outputs]);
|
|
*
|
|
* firstVPIN = first vpin in block allocated to this device
|
|
* numVPINs = number of vpins (e.g. 72 for an SMINI node)
|
|
* bus = 0-255
|
|
* address = 0-127
|
|
* type = 'M' for SMINI (fixed 24 inputs and 48 outputs)
|
|
* 'C' for CPNODE (16 to 144 inputs/outputs in groups of 8)
|
|
* (other types are not supported at this time).
|
|
* inputs = number of inputs (CPNODE only)
|
|
* outputs = number of outputs (CPNODE only)
|
|
*
|
|
* Reference: "LCS-9.10.1
|
|
* Layout Control Specification: CMRInet Protocol
|
|
* Version 1.1 December 2014."
|
|
*/
|
|
|
|
#ifndef IO_CMRI_H
|
|
#define IO_CMRI_H
|
|
|
|
#include "IODevice.h"
|
|
|
|
/**********************************************************************
|
|
* CMRInode class
|
|
*
|
|
* This encapsulates the state associated with a single CMRI node,
|
|
* which includes the address type, number of inputs and outputs, and
|
|
* the states of the inputs and outputs.
|
|
**********************************************************************/
|
|
class CMRInode : public IODevice {
|
|
private:
|
|
uint8_t _busNo;
|
|
uint8_t _address;
|
|
char _type;
|
|
CMRInode *_next = NULL;
|
|
uint8_t *_inputStates = NULL;
|
|
uint8_t *_outputStates = NULL;
|
|
uint16_t _numInputs = 0;
|
|
uint16_t _numOutputs = 0;
|
|
bool _initialised = false;
|
|
|
|
public:
|
|
static void create(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t address, char type, uint16_t inputs=0, uint16_t outputs=0) {
|
|
if (checkNoOverlap(firstVpin, nPins)) new CMRInode(firstVpin, nPins, busNo, address, type, inputs, outputs);
|
|
}
|
|
CMRInode(VPIN firstVpin, int nPins, uint8_t busNo, uint8_t address, char type, uint16_t inputs=0, uint16_t outputs=0);
|
|
|
|
uint8_t getAddress() {
|
|
return _address;
|
|
}
|
|
CMRInode *getNext() {
|
|
return _next;
|
|
}
|
|
void setNext(CMRInode *node) {
|
|
_next = node;
|
|
}
|
|
bool isInitialised() {
|
|
return _initialised;
|
|
}
|
|
void setInitialised() {
|
|
_initialised = true;
|
|
}
|
|
|
|
void _begin() {
|
|
_initialised = false;
|
|
}
|
|
|
|
int _read(VPIN vpin) {
|
|
// Return current state from this device
|
|
uint16_t pin = vpin - _firstVpin;
|
|
if (pin < _numInputs) {
|
|
uint8_t mask = 1 << (pin & 0x7);
|
|
int index = pin / 8;
|
|
return (_inputStates[index] & mask) != 0;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
void _write(VPIN vpin, int value) {
|
|
// Update current state for this device, in preparation the bus transmission
|
|
uint16_t pin = vpin - _firstVpin - _numInputs;
|
|
if (pin < _numOutputs) {
|
|
uint8_t mask = 1 << (pin & 0x7);
|
|
int index = pin / 8;
|
|
if (value)
|
|
_outputStates[index] |= mask;
|
|
else
|
|
_outputStates[index] &= ~mask;
|
|
}
|
|
}
|
|
|
|
void saveIncomingData(uint8_t index, uint8_t data) {
|
|
if (index < (_numInputs+7)/8)
|
|
_inputStates[index] = data;
|
|
}
|
|
|
|
uint8_t getOutputStates(uint8_t index) {
|
|
if (index < (_numOutputs+7)/8)
|
|
return _outputStates[index];
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
uint16_t getNumInputs() {
|
|
return _numInputs;
|
|
}
|
|
|
|
uint16_t getNumOutputs() {
|
|
return _numOutputs;
|
|
}
|
|
|
|
char getType() {
|
|
return _type;
|
|
}
|
|
|
|
uint8_t getBusNumber() {
|
|
return _busNo;
|
|
}
|
|
|
|
void _display() override {
|
|
DIAG(F("CMRInode type:'%c' configured on bus:%d address:%d VPINs:%u-%u (in) %u-%u (out)"),
|
|
_type, _busNo, _address, _firstVpin, _firstVpin+_numInputs-1,
|
|
_firstVpin+_numInputs, _firstVpin+_numInputs+_numOutputs-1);
|
|
}
|
|
|
|
};
|
|
|
|
/**********************************************************************
|
|
* CMRIbus class
|
|
*
|
|
* This encapsulates the properties state of the bus and the
|
|
* transmission and reception of data across that bus. Each CMRIbus
|
|
* object owns a set of CMRInode objects which represent the nodes
|
|
* attached to that bus.
|
|
**********************************************************************/
|
|
class CMRIbus : public IODevice {
|
|
private:
|
|
// Here we define the device-specific variables.
|
|
uint8_t _busNo;
|
|
HardwareSerial *_serial;
|
|
unsigned long _baud;
|
|
VPIN _transmitEnablePin = VPIN_NONE;
|
|
CMRInode *_nodeListStart = NULL, *_nodeListEnd = NULL;
|
|
CMRInode *_currentNode = NULL;
|
|
|
|
// Transmitter state machine states
|
|
enum {TD_IDLE, TD_PRETRANSMIT, TD_INIT, TD_TRANSMIT, TD_PROMPT, TD_RECEIVE};
|
|
uint8_t _transmitState = TD_IDLE;
|
|
// Receiver state machine states.
|
|
enum {RD_SYN1, RD_SYN2, RD_STX, RD_ADDR, RD_TYPE,
|
|
RD_DATA, RD_ESCDATA, RD_SKIPDATA, RD_SKIPESCDATA, RD_ETX};
|
|
uint8_t _receiveState = RD_SYN1;
|
|
uint16_t _receiveDataIndex = 0; // Index of next data byte to be received.
|
|
CMRIbus *_nextBus = NULL; // Pointer to next bus instance in list.
|
|
unsigned long _cycleStartTime = 0;
|
|
unsigned long _timeoutStart = 0;
|
|
unsigned long _cycleTime; // target time between successive read/write cycles, microseconds
|
|
unsigned long _timeoutPeriod; // timeout on read responses, in microseconds.
|
|
unsigned long _currentMicros; // last value of micros() from _loop function.
|
|
unsigned long _postDelay; // delay time after transmission before switching off transmitter (in us)
|
|
unsigned long _byteTransmitTime; // time in us for transmission of one byte
|
|
|
|
static CMRIbus *_busList; // linked list of defined bus instances
|
|
|
|
// Definition of special characters in CMRInet protocol
|
|
enum : uint8_t {
|
|
STX = 0x02,
|
|
ETX = 0x03,
|
|
DLE = 0x10,
|
|
SYN = 0xff,
|
|
};
|
|
|
|
public:
|
|
static void create(uint8_t busNo, HardwareSerial &serial, unsigned long baud, uint16_t cycleTimeMS=500, VPIN transmitEnablePin=VPIN_NONE) {
|
|
new CMRIbus(busNo, serial, baud, cycleTimeMS, transmitEnablePin);
|
|
}
|
|
|
|
// Device-specific initialisation
|
|
void _begin() override {
|
|
// Some sources quote one stop bit, some two.
|
|
_serial->begin(_baud, SERIAL_8N1);
|
|
#if defined(DIAG_IO)
|
|
_display();
|
|
#endif
|
|
}
|
|
|
|
// Loop function (overriding IODevice::_loop(unsigned long))
|
|
void _loop(unsigned long currentMicros) override;
|
|
|
|
// Display information about the device
|
|
void _display() override {
|
|
DIAG(F("CMRIbus %d configured, speed=%d baud, cycle=%d ms"), _busNo, _baud, _cycleTime/1000);
|
|
}
|
|
|
|
// Locate CMRInode object with specified address.
|
|
CMRInode *findNode(uint8_t address) {
|
|
for (CMRInode *node = _nodeListStart; node != NULL; node = node->getNext()) {
|
|
if (node->getAddress() == address)
|
|
return node;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
// Add new CMRInode to the list of nodes for this bus.
|
|
void addNode(CMRInode *newNode) {
|
|
if (!_nodeListStart)
|
|
_nodeListStart = newNode;
|
|
if (!_nodeListEnd)
|
|
_nodeListEnd = newNode;
|
|
else
|
|
_nodeListEnd->setNext(newNode);
|
|
}
|
|
|
|
protected:
|
|
CMRIbus(uint8_t busNo, HardwareSerial &serial, unsigned long baud, uint16_t cycleTimeMS, VPIN transmitEnablePin);
|
|
uint16_t sendData(CMRInode *node);
|
|
uint16_t requestData(CMRInode *node);
|
|
uint16_t sendInitialisation(CMRInode *node);
|
|
|
|
// Process any data bytes received from a CMRInode.
|
|
void processIncoming();
|
|
// Process any outgoing traffic that is due.
|
|
void processOutgoing();
|
|
// Enable transmitter
|
|
void enableTransmitter();
|
|
// Disable transmitter and enable receiver
|
|
void disableTransmitter();
|
|
|
|
|
|
public:
|
|
uint8_t getBusNumber() {
|
|
return _busNo;
|
|
}
|
|
|
|
static CMRIbus *findBus(uint8_t busNo) {
|
|
for (CMRIbus *bus=_busList; bus!=NULL; bus=bus->_nextBus) {
|
|
if (bus->_busNo == busNo) return bus;
|
|
}
|
|
return NULL;
|
|
}
|
|
};
|
|
|
|
#endif // IO_CMRI_H
|