mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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153 lines
6.1 KiB
C++
153 lines
6.1 KiB
C++
/*
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* © 2020, Chris Harlow. All rights reserved.
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*
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* This file is a demonstattion of calling the DCC-EX API
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*/
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#include "DCCEX.h"
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#ifdef ARDUINO_AVR_UNO
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#include <SoftwareSerial.h>
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SoftwareSerial Serial1(15,16); // YOU must get these pins correct to use Wifi on a UNO
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#define WIFI_BAUD 9600
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#else
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#define WIFI_BAUD 115200
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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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void myComandFilter(Print * stream, byte & opcode, byte & paramCount, int p[]) {
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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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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) DCC::forgetAllLocos();
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else for (int i=0;i<paramCount;i++) 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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(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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// 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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void myCallback(int result) {
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DIAG(F("\n getting Loco Id callback result=%d"),result);
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}
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// Create a serial command parser... This is OPTIONAL if you don't need to handle JMRI type commands
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// from the Serial port.
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DCCEXParser serialParser;
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// Try monitoring the memory
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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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void setup() {
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// The main sketch has responsibilities during setup()
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// Responsibility 1: Start the usb connection for diagnostics and possible JMRI input
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// DIAGSERAL is normally Serial but uses SerialUSB on a SAMD processor
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DIAGSERIAL.begin(115200);
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while(!DIAGSERIAL);
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// Responsibility 2: 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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DCC::begin(STANDARD_MOTOR_SHIELD);
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// Responsibility 3: **Optionally** Start the WiFi interface if required.
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// NOTE: On a Uno you will have to provide a SoftwareSerial
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// configured for the pins connected to the Wifi card
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// and a 9600 baud rate.
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// setup(serial, F(router name) or NULL, F(router password), F(hostname), F(AcessPoint name) or NULL , port)
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// (port 3532 is 0xDCC decimal.)
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Serial1.begin(WIFI_BAUD);
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WifiInterface::setup(Serial1, F("BTHub5-M6PT"), F("49de8d4862"),F("DCCEX"),3532);
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// Optionally tell the Wifi parser to use my http filter.
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// This will intercept http commands from Wifi.
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WifiInterface::setHTTPCallback(myHttpFilter);
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// This is just for demonstration purposes
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DIAG(F("\n===== CVReader 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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// 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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DCCEXParser::setFilter(myComandFilter);
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DIAG(F("\nReady for JMRI commands\n"));
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}
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void loop() {
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// The main sketch has responsibilities during loop()
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// Responsibility 1: Handle DCC background processes
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// (loco reminders and power checks)
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DCC::loop();
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// Responsibility 2: handle any incoming commands on USB connection
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serialParser.loop(DIAGSERIAL);
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// Responsibility 3: Optionally handle any incoming WiFi traffic
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WifiInterface::loop();
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// Your additional loop code
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// Optionally report any decrease in memory (will automatically trigger on first call)
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int freeNow=freeMemory();
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if (freeNow<ramLowWatermark) {
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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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}
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