mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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214 lines
7.9 KiB
C++
214 lines
7.9 KiB
C++
/*
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* © 2021, 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_EXIOExpander.h device driver integrates with one or more EX-IOExpander devices.
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* This device driver will configure the device on startup, along with
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* interacting with the device for all input/output duties.
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*
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* To create EX-IOExpander devices, these are defined in myHal.cpp:
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* (Note the device driver is included by default)
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*
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* void halSetup() {
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* // EXIOExpander::create(vpin, num_vpins, i2c_address, digitalPinCount, analoguePinCount);
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* EXIOExpander::create(800, 18, 0x65, 12, 8);
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* }
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*
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* Note when defining the number of digital and analogue pins, there is no way to sanity check
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* this from the device driver, and it is up to the user to define the correct values here.
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*
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* All pins available on the EX-IOExpander device must be accounted for.
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*
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* Vpins are allocated to digital pins first, and then analogue pins, so digital pins will
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* populate the first part of the specified vpin range, with the analogue pins populating the
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* last part of the vpin range.
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* Eg. for a default Nano, 800 - 811 are digital (D2 - D13), 812 to 817 are analogue (A0 - A3, A6/A7).
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*/
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#ifndef IO_EX_IOEXPANDER_H
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#define IO_EX_IOEXPANDER_H
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#include "I2CManager.h"
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#include "DIAG.h"
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#include "FSH.h"
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/////////////////////////////////////////////////////////////////////////////////////////////////////
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/*
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* IODevice subclass for EX-IOExpander.
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*/
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class EXIOExpander : public IODevice {
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public:
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static void create(VPIN vpin, int nPins, I2CAddress i2cAddress, int numDigitalPins, int numAnaloguePins) {
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if (checkNoOverlap(vpin, nPins, i2cAddress)) new EXIOExpander(vpin, nPins, i2cAddress, numDigitalPins, numAnaloguePins);
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}
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private:
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// Constructor
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EXIOExpander(VPIN firstVpin, int nPins, I2CAddress i2cAddress, int numDigitalPins, int numAnaloguePins) {
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_firstVpin = firstVpin;
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_nPins = nPins;
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_i2cAddress = i2cAddress;
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_numDigitalPins = numDigitalPins;
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_numAnaloguePins = numAnaloguePins;
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_digitalPinBytes = (numDigitalPins+7)/8;
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_analoguePinBytes = numAnaloguePins * 2;
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_digitalInputStates=(byte*) calloc(_digitalPinBytes,1);
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_analogueInputStates=(byte*) calloc(_analoguePinBytes,1);
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addDevice(this);
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}
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void _begin() {
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// Initialise EX-IOExander device
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I2CManager.begin();
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if (I2CManager.exists(_i2cAddress)) {
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_digitalOutBuffer[0] = EXIOINIT;
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_digitalOutBuffer[1] = _numDigitalPins;
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_digitalOutBuffer[2] = _numAnaloguePins;
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// Send config, if EXIORDY returned, we're good, otherwise go offline
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I2CManager.read(_i2cAddress, _commandBuffer, 1, _digitalOutBuffer, 3);
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if (_commandBuffer[0] != EXIORDY) {
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DIAG(F("ERROR configuring EX-IOExpander device, I2C:x%x"), (int)_i2cAddress);
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_deviceState = DEVSTATE_FAILED;
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return;
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}
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// Attempt to get version, if we don't get it, we don't care, don't go offline
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// Using digital in buffer in reverse to save RAM
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_commandBuffer[0] = EXIOVER;
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I2CManager.read(_i2cAddress, _versionBuffer, 3, _commandBuffer, 1);
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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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DIAG(F("EX-IOExpander device found, I2C:x%x, Version v%d.%d.%d"),
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(int)_i2cAddress, _versionBuffer[0], _versionBuffer[1], _versionBuffer[2]);
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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("EX-IOExpander device not found, I2C:x%x"), (int)_i2cAddress);
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_deviceState = DEVSTATE_FAILED;
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}
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}
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bool _configure(VPIN vpin, ConfigTypeEnum configType, int paramCount, int params[]) override {
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if (configType != CONFIGURE_INPUT) return false;
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if (paramCount != 1) return false;
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if (vpin >= _firstVpin + _numDigitalPins) {
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DIAG(F("EX-IOExpander ERROR: Vpin %d is an analogue pin, cannot use as a digital pin"), vpin);
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return false;
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}
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bool pullup = params[0];
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int pin = vpin - _firstVpin;
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_digitalOutBuffer[0] = EXIODPUP;
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_digitalOutBuffer[1] = pin;
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_digitalOutBuffer[2] = pullup;
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I2CManager.write(_i2cAddress, _digitalOutBuffer, 3);
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return true;
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}
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// We only use this to detect incorrect use of analogue pins
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int _configureAnalogIn(VPIN vpin) override {
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if (vpin < _firstVpin + _numDigitalPins) {
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DIAG(F("EX-IOExpander ERROR: Vpin %d is a digital pin, cannot use as an analogue pin"), vpin);
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return false;
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}
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int pin = vpin - _firstVpin;
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_analogueOutBuffer[0] = EXIOENAN;
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_analogueOutBuffer[1] = pin;
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I2CManager.write(_i2cAddress, _analogueOutBuffer, 2);
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return true;
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}
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void _loop(unsigned long currentMicros) override {
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(void)currentMicros; // remove warning
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_commandBuffer[0] = EXIORDD;
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I2CManager.read(_i2cAddress, _digitalInputStates, _digitalPinBytes, _commandBuffer, 1);
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_commandBuffer[0] = EXIORDAN;
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I2CManager.read(_i2cAddress, _analogueInputStates, _analoguePinBytes, _commandBuffer, 1);
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}
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int _readAnalogue(VPIN vpin) override {
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if (vpin < _firstVpin + _numDigitalPins) return false;
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int pin = vpin - _firstVpin - _numDigitalPins;
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uint8_t _pinLSBByte = pin * 2;
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uint8_t _pinMSBByte = _pinLSBByte + 1;
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return (_analogueInputStates[_pinMSBByte] << 8) + _analogueInputStates[_pinLSBByte];
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}
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int _read(VPIN vpin) override {
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if (vpin >= _firstVpin + _numDigitalPins) return false;
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int pin = vpin - _firstVpin;
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uint8_t pinByte = pin / 8;
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bool value = _digitalInputStates[pinByte] >> (pin - pinByte * 8);
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return value;
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}
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void _write(VPIN vpin, int value) override {
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if (vpin >= _firstVpin + _numDigitalPins) return;
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int pin = vpin - _firstVpin;
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_digitalOutBuffer[0] = EXIOWRD;
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_digitalOutBuffer[1] = pin;
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_digitalOutBuffer[2] = value;
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I2CManager.write(_i2cAddress, _digitalOutBuffer, 3);
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}
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void _display() override {
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int _firstAnalogue, _lastAnalogue;
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if (_numAnaloguePins == 0) {
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_firstAnalogue = 0;
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_lastAnalogue = 0;
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} else {
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_firstAnalogue = _firstVpin + _numDigitalPins;
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_lastAnalogue = _firstVpin + _nPins - 1;
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}
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DIAG(F("EX-IOExpander I2C:x%x v%d.%d.%d: %d Digital Vpins %d-%d, %d Analogue Vpins %d-%d %S"),
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(int)_i2cAddress, _majorVer, _minorVer, _patchVer,
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_numDigitalPins, _firstVpin, _firstVpin + _numDigitalPins - 1,
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_numAnaloguePins, _firstAnalogue, _lastAnalogue,
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_deviceState == DEVSTATE_FAILED ? F("OFFLINE") : F(""));
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}
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uint8_t _i2cAddress;
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uint8_t _numDigitalPins;
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uint8_t _numAnaloguePins;
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byte _analogueOutBuffer[2];
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byte _digitalOutBuffer[3];
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uint8_t _versionBuffer[3];
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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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byte* _digitalInputStates;
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byte* _analogueInputStates;
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uint8_t _digitalPinBytes = 0;
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uint8_t _analoguePinBytes = 0;
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byte _commandBuffer[1];
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enum {
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EXIOINIT = 0xE0, // Flag to initialise setup procedure
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EXIORDY = 0xE1, // Flag we have completed setup procedure, also for EX-IO to ACK setup
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EXIODPUP = 0xE2, // Flag we're sending digital pin pullup configuration
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EXIOVER = 0xE3, // Flag to get version
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EXIORDAN = 0xE4, // Flag to read an analogue input
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EXIOWRD = 0xE5, // Flag for digital write
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EXIORDD = 0xE6, // Flag to read digital input
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EXIOENAN = 0xE7, // Flag eo enable an analogue pin
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};
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};
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#endif
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