2020-09-22 20:57:11 +02:00
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////////////////////////////////////////////////////////////////////////////////////
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// © 2020, Chris Harlow. All rights reserved.
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//
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// This file is a demonstattion of setting up a DCC-EX
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// Command station to support direct connection of WiThrottle devices
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// such as "Engine Driver". If you contriol your layout through JMRI
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// then DON'T connect throttles to this wifi, connect them to JMRI.
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//
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// This is just 3 statements longer than the basic setup.
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//
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// THIS SETUP DOES NOT APPLY TO ARDUINO UNO WITH ONLY A SINGLE SERIAL PORT.
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// REFER TO SEPARATE EXAMPLE.
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////////////////////////////////////////////////////////////////////////////////////
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#include "config.h"
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#include "DCC.h"
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#include "DIAG.h"
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#include "DCCEXParser.h"
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#if ENABLE_WIFI
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#include "WifiInterface.h"
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#endif
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#if ENABLE_FREE_MEM_WARNING
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#include "freeMemory.h"
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int ramLowWatermark = 32767; // This figure gets overwritten dynamically in loop()
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#endif
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// this code is here to demonstrate use of the DCC API and other techniques
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// myFilter is an example of an OPTIONAL command filter used to intercept < > commands from
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// the usb or wifi streamm. It demonstrates how a command may be intercepted
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// or even a new command created without having to break open the API library code.
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// The filter is permitted to use or modify the parameter list before passing it on to
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// the standard parser. By setting the opcode to 0, the standard parser will
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// just ignore the command on the assumption that you have already handled it.
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//
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// The filter must be enabled by calling the DCC EXParser::setFilter method, see use in setup().
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#if ENABLE_CUSTOM_FILTER
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void myComandFilter(Print *stream, byte &opcode, byte ¶mCount, int p[])
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{
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(void)stream; // avoid compiler warning if we don't access this parameter
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switch (opcode)
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{
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case '!': // Create a bespoke new command to clear all loco reminders <!> or specific locos e.g <! 3 4 99>
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if (paramCount == 0)
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DCC::forgetAllLocos();
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else
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for (int i = 0; i < paramCount; i++)
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DCC::forgetLoco(p[i]);
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opcode = 0; // tell parser to ignore this command as we have done it already
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break;
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default: // drop through and parser will use the command unaltered.
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break;
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}
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}
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// This is an OPTIONAL example of a HTTP filter...
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// If you have configured wifi and an HTTP request is received on the Wifi connection
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// it will normally be rejected 404 Not Found.
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// If you wish to handle HTTP requests, you can create a filter and ask the WifiInterface to
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// call your code for each detected http request.
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void myHttpFilter(Print *stream, byte *cmd)
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{
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(void)cmd; // Avoid compiler warning because this example doesnt use this parameter
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// BEWARE - As soon as you start responding, the cmd buffer is trashed!
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// You must get everything you need from it before using StringFormatter::send!
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StringFormatter::send(stream, F("HTTP/1.1 200 OK\nContent-Type: text/html\nConnnection: close\n\n"));
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StringFormatter::send(stream, F("<html><body>This is my HTTP filter responding.<br/></body></html>"));
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}
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#endif
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// Callback functions are necessary if you call any API that must wait for a response from the
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// programming track. The API must return immediately otherwise other loop() functions would be blocked.
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// Your callback function will be invoked when the data arrives from the prog track.
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// See the DCC:getLocoId example in the setup function.
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#if ENABLE_CUSTOM_CALLBACK
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void myCallback(int result)
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{
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DIAG(F("\n getting Loco Id callback result=%d"), result);
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}
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#endif
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2020-09-12 00:27:46 +02:00
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// Create a serial command parser... Enables certain diagnostics and commands
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2020-09-22 20:57:11 +02:00
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// to be issued from the USB serial console
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2020-09-12 00:27:46 +02:00
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// This is NOT intended for JMRI....
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2020-09-22 20:57:11 +02:00
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DCCEXParser serialParser;
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2020-09-12 00:27:46 +02:00
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2020-09-22 20:57:11 +02:00
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void setup()
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{
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2020-09-12 00:27:46 +02:00
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// The main sketch has responsibilities during setup()
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2020-09-22 20:57:11 +02:00
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// Responsibility 1: Start the usb connection for diagnostics
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2020-09-12 00:27:46 +02:00
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// This is normally Serial but uses SerialUSB on a SAMD processor
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Serial.begin(115200);
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2020-09-19 01:40:18 +02:00
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2020-09-22 20:57:11 +02:00
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// Start the WiFi interface on a MEGA, Uno cannot currently handle WiFi
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// NOTE: References to Serial1 are for the serial port used to connect
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// your wifi chip/shield.
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// Optionally tell the command parser to use my example filter.
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// This will intercept JMRI commands from both USB and Wifi
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#if ENABLE_CUSTOM_FILTER
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DCCEXParser::setFilter(myComandFilter);
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#endif
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#if ENABLE_CUSTOM_CALLBACK
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// This is just for demonstration purposes
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DIAG(F("\n===== DCCEX demonstrating DCC::getLocoId() call ==========\n"));
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DCC::getLocoId(myCallback); // myCallback will be called with the result
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DIAG(F("\n===== DCC::getLocoId has returned, but the callback wont be executed until we are in loop() ======\n"));
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#endif
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2020-09-22 22:02:11 +02:00
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#if ENABLE_WIFI && (defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560))
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2020-09-22 21:20:33 +02:00
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bool wifiUp = false;
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2020-09-22 21:57:26 +02:00
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const __FlashStringHelper *wifiESSID = F(WIFI_SSID);
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const __FlashStringHelper *wifiPassword = F(WIFI_PASSWORD);
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const __FlashStringHelper *dccex = F(WIFI_HOSTNAME);
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const uint16_t port = WIFI_PORT;
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2020-09-22 21:20:33 +02:00
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2020-09-22 20:57:11 +02:00
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Serial1.begin(WIFI_SERIAL_LINK_SPEED);
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2020-09-22 21:57:26 +02:00
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wifiUp = WifiInterface::setup(Serial1, wifiESSID, wifiPassword, dccex, port);
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2020-09-22 21:20:33 +02:00
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if (!wifiUp)
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{
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2020-09-22 23:15:27 +02:00
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Serial2.begin(WIFI_SERIAL_LINK_SPEED);
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2020-09-22 21:57:26 +02:00
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wifiUp = WifiInterface::setup(Serial2, wifiESSID, wifiPassword, dccex, port);
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2020-09-22 21:20:33 +02:00
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}
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if (!wifiUp)
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{
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2020-09-22 23:15:27 +02:00
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Serial3.begin(WIFI_SERIAL_LINK_SPEED);
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2020-09-22 21:57:26 +02:00
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wifiUp = WifiInterface::setup(Serial3, wifiESSID, wifiPassword, dccex, port);
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2020-09-22 21:20:33 +02:00
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}
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2020-09-22 20:57:11 +02:00
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#endif
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2020-09-12 00:27:46 +02:00
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2020-09-22 20:57:11 +02:00
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// Responsibility 3: Start the DCC engine.
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// Note: this provides DCC with two motor drivers, main and prog, which handle the motor shield(s)
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// Standard supported devices have pre-configured macros but custome hardware installations require
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// detailed pin mappings and may also require modified subclasses of the MotorDriver to implement specialist logic.
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// STANDARD_MOTOR_SHIELD, POLOLU_MOTOR_SHIELD, FIREBOX_MK1, FIREBOX_MK1S are pre defined in MotorShields.h
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// Optionally a Timer number (1..4) may be passed to DCC::begin to override the default Timer1 used for the
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// waveform generation. e.g. DCC::begin(STANDARD_MOTOR_SHIELD,2); to use timer 2
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2020-09-22 21:57:26 +02:00
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DCC::begin(MOTOR_SHIELD_TYPE);
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2020-09-12 00:27:46 +02:00
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}
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2020-09-22 20:57:11 +02:00
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void loop()
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{
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2020-09-12 00:27:46 +02:00
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// The main sketch has responsibilities during loop()
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2020-09-22 20:57:11 +02:00
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2020-09-12 00:27:46 +02:00
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// Responsibility 1: Handle DCC background processes
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// (loco reminders and power checks)
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2020-09-22 20:57:11 +02:00
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DCC::loop();
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2020-09-12 00:27:46 +02:00
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// Responsibility 2: handle any incoming commands on USB connection
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serialParser.loop(Serial);
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2020-09-22 20:57:11 +02:00
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// Responsibility 3: Optionally handle any incoming WiFi traffic
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2020-09-22 23:15:27 +02:00
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#if ENABLE_WIFI && (defined(ARDUINO_AVR_MEGA) || defined(ARDUINO_AVR_MEGA2560))
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2020-09-12 00:27:46 +02:00
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WifiInterface::loop();
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2020-09-22 20:57:11 +02:00
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#endif
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2020-09-12 00:27:46 +02:00
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2020-09-22 20:57:11 +02:00
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// Optionally report any decrease in memory (will automatically trigger on first call)
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#if ENABLE_FREE_MEM_WARNING
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int freeNow = freeMemory();
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if (freeNow < ramLowWatermark)
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{
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ramLowWatermark = freeNow;
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DIAG(F("\nFree RAM=%d\n"), ramLowWatermark);
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}
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#endif
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2020-09-12 00:27:46 +02:00
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}
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