mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-12-24 13:21:23 +01:00
193 lines
7.5 KiB
C++
193 lines
7.5 KiB
C++
/*
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* © 2023, Peter Cole. All rights reserved.
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* © 2022, Peter Cole. All rights reserved.
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*
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* This file is part of EX-CommandStation
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*
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* This is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* It is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
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*/
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/*
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* The IO_RotaryEncoder device driver is used to receive positions from a rotary encoder connected to an Arduino via I2C.
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*
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* There is separate code required for the Arduino the rotary encoder is connected to, which is located here:
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* https://github.com/peteGSX-Projects/dcc-ex-rotary-encoder
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*
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* This device driver receives the rotary encoder position when the rotary encoder button is pushed, and these positions
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* can be tested in EX-RAIL with:
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* ONCHANGE(vpin) - flag when the rotary encoder position has changed from the previous position
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* IFRE(vpin, position) - test to see if specified rotary encoder position has been received
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*
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* Feedback can also be sent to the rotary encoder by using 2 Vpins, and sending a SET()/RESET() to the second Vpin.
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* A SET(vpin) will flag that a turntable (or anything else) is in motion, and a RESET(vpin) that the motion has finished.
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*
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* In addition, defining a third Vpin will allow a position number to be sent so that when an EXRAIL automation or some other
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* activity has moved a turntable, the position can be reflected in the rotary encoder software. This can be accomplished
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* using the EXRAIL SERVO(vpin, position, profile) command, where:
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* - vpin = the third defined Vpin (any other is ignored)
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* - position = the defined position in the DCC-EX Rotary Encoder software, 0 (Home) to 255
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* - profile = Must be defined as per the SERVO() command, but is ignored as it has no relevance
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*
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* Defining in myAutomation.h requires the device driver to be included in addition to the HAL() statement. Examples:
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*
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* #include "IO_RotaryEncoder.h"
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* HAL(RotaryEncoder, 700, 1, 0x70) // Define single Vpin, no feedback or position sent to rotary encoder software
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* HAL(RotaryEncoder, 700, 2, 0x70) // Define two Vpins, feedback only sent to rotary encoder software
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* HAL(RotaryEncoder, 700, 3, 0x70) // Define three Vpins, can send feedback and position update to rotary encoder software
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*
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* Refer to the documentation for further information including the valid activities and examples.
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*/
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#ifndef IO_ROTARYENCODER_H
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#define IO_ROTARYENCODER_H
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#include "EXRAIL2.h"
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#include "IODevice.h"
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#include "I2CManager.h"
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#include "DIAG.h"
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class RotaryEncoder : public IODevice {
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public:
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static void create(VPIN firstVpin, int nPins, I2CAddress i2cAddress) {
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if (checkNoOverlap(firstVpin, nPins, i2cAddress)) new RotaryEncoder(firstVpin, nPins, i2cAddress);
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}
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private:
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// Constructor
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RotaryEncoder(VPIN firstVpin, int nPins, I2CAddress i2cAddress){
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_firstVpin = firstVpin;
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_nPins = nPins;
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if (_nPins > 3) {
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_nPins = 3;
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DIAG(F("RotaryEncoder WARNING:%d vpins defined, only 3 supported"), _nPins);
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}
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_I2CAddress = i2cAddress;
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addDevice(this);
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}
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// Initiate the device
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void _begin() {
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uint8_t _status;
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// Attempt to initilalise device
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I2CManager.begin();
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if (I2CManager.exists(_I2CAddress)) {
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// Send RE_RDY, must receive RE_RDY to be online
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_sendBuffer[0] = RE_RDY;
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_status = I2CManager.read(_I2CAddress, _rcvBuffer, 1, _sendBuffer, 1);
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if (_status == I2C_STATUS_OK) {
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if (_rcvBuffer[0] == RE_RDY) {
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_sendBuffer[0] = RE_VER;
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if (I2CManager.read(_I2CAddress, _versionBuffer, 3, _sendBuffer, 1) == I2C_STATUS_OK) {
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_majorVer = _versionBuffer[0];
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_minorVer = _versionBuffer[1];
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_patchVer = _versionBuffer[2];
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}
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} else {
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DIAG(F("RotaryEncoder I2C:%s garbage received: %d"), _I2CAddress.toString(), _rcvBuffer[0]);
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_deviceState = DEVSTATE_FAILED;
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return;
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}
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} else {
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DIAG(F("RotaryEncoder I2C:%s ERROR connecting"), _I2CAddress.toString());
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_deviceState = DEVSTATE_FAILED;
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return;
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}
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#ifdef DIAG_IO
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_display();
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#endif
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} else {
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DIAG(F("RotaryEncoder I2C:%s device not found"), _I2CAddress.toString());
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_deviceState = DEVSTATE_FAILED;
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}
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}
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void _loop(unsigned long currentMicros) override {
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if (_deviceState == DEVSTATE_FAILED) return; // Return if device has failed
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if (_i2crb.isBusy()) return; // Return if I2C operation still in progress
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if (currentMicros - _lastPositionRead > _positionRefresh) {
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_lastPositionRead = currentMicros;
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_sendBuffer[0] = RE_READ;
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I2CManager.read(_I2CAddress, _rcvBuffer, 1, _sendBuffer, 1, &_i2crb); // Read position from encoder
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_position = _rcvBuffer[0];
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// If EXRAIL is active, we need to trigger the ONCHANGE() event handler if it's in use
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#if defined(EXRAIL_ACTIVE)
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if (_position != _previousPosition) {
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_previousPosition = _position;
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RMFT2::changeEvent(_firstVpin, 1);
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} else {
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RMFT2::changeEvent(_firstVpin, 0);
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}
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#endif
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}
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}
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// Return the position sent by the rotary encoder software
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int _readAnalogue(VPIN vpin) override {
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if (_deviceState == DEVSTATE_FAILED) return 0;
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return _position;
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}
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// Send the feedback value to the rotary encoder software
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void _write(VPIN vpin, int value) override {
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if (vpin == _firstVpin + 1) {
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if (value != 0) value = 0x01;
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byte _feedbackBuffer[2] = {RE_OP, (byte)value};
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I2CManager.write(_I2CAddress, _feedbackBuffer, 2);
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}
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}
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// Send a position update to the rotary encoder software
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// To be valid, must be 0 to 255, and different to the current position
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// If the current position is the same, it was initiated by the rotary encoder
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void _writeAnalogue(VPIN vpin, int position, uint8_t profile, uint16_t duration) override {
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if (vpin == _firstVpin + 2) {
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if (position >= 0 && position <= 255 && position != _position) {
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byte newPosition = position & 0xFF;
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byte _positionBuffer[2] = {RE_MOVE, newPosition};
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I2CManager.write(_I2CAddress, _positionBuffer, 2);
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}
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}
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}
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void _display() override {
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DIAG(F("Rotary Encoder I2C:%s v%d.%d.%d Configured on VPIN:%u-%d %S"), _I2CAddress.toString(), _majorVer, _minorVer, _patchVer,
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(int)_firstVpin, _firstVpin+_nPins-1, (_deviceState==DEVSTATE_FAILED) ? F("OFFLINE") : F(""));
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}
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int8_t _position;
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int8_t _previousPosition = 0;
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uint8_t _versionBuffer[3];
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uint8_t _sendBuffer[1];
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uint8_t _rcvBuffer[1];
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uint8_t _majorVer = 0;
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uint8_t _minorVer = 0;
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uint8_t _patchVer = 0;
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I2CRB _i2crb;
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unsigned long _lastPositionRead = 0;
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const unsigned long _positionRefresh = 100000UL; // Delay refreshing position for 100ms
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enum {
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RE_RDY = 0xA0, // Flag to check if encoder is ready for operation
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RE_VER = 0xA1, // Flag to retrieve rotary encoder software version
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RE_READ = 0xA2, // Flag to read the current position of the encoder
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RE_OP = 0xA3, // Flag for operation start/end, sent to when sending feedback on move start/end
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RE_MOVE = 0xA4, // Flag for sending a position update from the device driver to the encoder
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};
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};
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#endif
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