I already got my code to transmit encoder signals to LinuxCNC to manually jog. I'll post my code - it's not polished up clean, but you get the idea:
Code:
/*
https://forum.linuxcnc.org/media/kunena/attachments/9308/udpcomms.txt
Modified 2-13-2017 - begin, Erich Stein
2-14-2017 - process code, make adjustments
2-20-2017 - debugged transmit failure, continue to speed test
The purpose of this program is to provide a wireless hardware interface to LinuxCNC.
Features:
Input:
1 Encoder interface 2 DI - Multipurpose jog positioning
1 Analog potentiometer input 1 AI - Speed feed override
2 Pushbuttons 2 DI - 1) Toggle encoder axis, 2) Toggle encoder precision
3 Switches 3 DI - Machine on-ready, 2 undefined
Output:
2 Digital signals output 2 DO - Machine on, Error stop
3 Digital signals output 3 DO - System homed x, y, z
Sound buzzer - TODO Optional 1 DO - Audio output interface, errors, ready, done, input required
Budget: 6 + 6 - 12 SIGNALS, speaker, audio amplifier
*/
//#include <SPI.h> // needed for Arduino versions later than 0018
//#include <Ethernet.h>
//#include <EthernetUdp.h> // UDP library from: bjoern@cs.stanford.edu 12/30/2008
//#include <string.h>
//#include <stdio.h>
//#include <stdlib.h>
//#include <ctype.h>
#include <WiFiEsp.h>
#include <WiFiEspUdp.h>
#include <Encoder.h>
// emulate Serial1 if not present
#ifndef HAVE_HWSERIAL1
#include "SoftwareSerial.h"
SoftwareSerial Serial1(5, 4); // RX, TX
#endif
//#define cDebug true
#define cDebug false
WiFiEspUDP Udp; // An EthernetUDP instance to let us send and receive packets over UDP
//IPAddress ipLocal(192, 168, 16, 200); // local ip address
IPAddress ipRemote(192, 168, 16, 9); // remote ip address
char ssid[] = "my_local_wifi_ssid";
char pass[] = "mySSIDpassword";
unsigned int portLocal = 8888; // local port
unsigned int portRemote = 8888; // remote port
#define iPacketSize 100
byte rxChar;
char workBuffer[iPacketSize];
char rxTokens[5];
char *newToken;
const char sComma[2] = ",";
char *token;
//char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; // buffer to hold incoming packet,
char packetBuffer[iPacketSize]; // buffer to hold incoming packet,
char ReplyBuffer[iPacketSize];// = "acknowledged"; // a string to send back
String sMessage = "";
uint16_t adcResult;
int pinADC=A0; // pin number for analog input
uint8_t firstbyte=0x0;
const byte byPinsInput = 6; // number of input pins.
const byte byPinsOutput = 6; // number of output pins. For some reason, is receiving ?!?!
const byte byPinsOutputAnalog = 2; // number of analog input pins
byte pinMapOut[byPinsOutput] = {A1,A2,8,9,10,11}; // Output pins
byte pinMapIn[byPinsInput] = {A1,A2,8,9,10,11}; // Output pins
uint8_t dacPinMap[1] = {A3}; // appears to be only 1 (2?) analog outputs
// encoder section
#define ENCODER_OPTIMIZE_INTERRUPTS
//Encoder myEncoder(5, 4); // Encoder interface
Encoder myEncoder(3, 2); // Encoder interface
char cCounter[2] = {0,0};
char oldPosition = -1;
char newPosition = 0;
void setup()
{
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
//pinMode(4, INPUT_PULLUP);
//pinMode(5, INPUT_PULLUP);
Serial.begin(115200);
Serial.println(F("Initiate program emc2interface v1.1.1"));
// start the Ethernet and UDP:
Serial1.begin(9600);
WiFi.init(&Serial1);
WiFi.begin(ssid, pass);
while (WiFi.status() != WL_CONNECTED)
{
delay(64);
Serial.print(F(". "));
}
Serial.println();
Serial.print(F("Connect WiFi, IP: "));
Serial.println(WiFi.localIP());
Udp.begin(portLocal);
}
void loop()
{
// encodeTx(); // moved from [here]
// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if(packetSize)
{
Udp.read(packetBuffer, iPacketSize);
if (cDebug)
{
Serial.print(F("Packet size:"));
Serial.print(packetSize);
Serial.print(F(" Buffer:"));
Serial.println(packetBuffer);
}
decodeRx(packetBuffer, packetSize);
memset(packetBuffer,'\0',sizeof(packetBuffer));
//delay(10);
encodeTx(); // moved to [here]
}
//process encoder data
newPosition = char(myEncoder.read());
if (newPosition>=126 || newPosition<=-126)
{
myEncoder.write(0);
oldPosition = -1;
newPosition = 0;
}
if (newPosition != oldPosition)
{
if (cDebug)
{
Serial.print(F("PosNew:"));
Serial.print(int(newPosition));
Serial.print(F(", "));
Serial.print(int(cCounter[1]));
Serial.print(F(" PosOld:"));
Serial.print(int(oldPosition));
Serial.print(F(", "));
Serial.print(int(cCounter[0]));
Serial.println();
}
cCounter[0] = oldPosition;
cCounter[1] = newPosition;
oldPosition = newPosition;
}
//delay(1);
}
void decodeRx(char* rxBuffer, int iBufferLength)
{
int iInt = 0;
memset(workBuffer,'\0',sizeof(workBuffer)); // clear memory
if (cDebug)
{
Serial.print(F("rxBuffer:"));
for(int iTemp=0;iTemp<iBufferLength;iTemp++)
Serial.write(rxBuffer[iTemp]);
}
if(rxBuffer[0] != '[')
return;
strncpy(workBuffer,&rxBuffer[5],iBufferLength);
if (cDebug)
{
Serial.print(F(" sCopy5:"));
Serial.print(&rxBuffer[5]);
Serial.print(F(" workBuffer:"));
Serial.println(workBuffer);
}
/* get the first token */
token = strtok(workBuffer, sComma);
newToken = skip_spaces(token);
rxTokens[iInt] = atoi(newToken);
iInt++;
/* walk through other tokens */
while( token != NULL )
{
token = NULL;
token = strtok(NULL, sComma);
newToken = skip_spaces(token);
rxTokens[iInt] = atoi(newToken);
iInt++;
}
for (char xChar = 0; xChar < 4; xChar++) // 0 - 3
{
rxChar = rxTokens[xChar];
switch (xChar)
{
case 0:
if (cDebug)
{// get the analog output value
//analogWrite(dacPinMap[xChar], rxChar);
Serial.print(F(" aWr:"));
Serial.print(dacPinMap[xChar]);
Serial.print(F(" ~ "));
Serial.println((byte)rxChar);
}
break;
case 1: // get the number of output pins
for (int zCounter = 0; zCounter < byPinsOutput; zCounter++)
{
uint8_t iOutTemp = 0;
iOutTemp = ((rxChar >> zCounter) & 1);
if (cDebug)
{
Serial.print(F(" dWrite:"));
Serial.print(pinMapOut[zCounter]);
Serial.print(F(" ~ "));
Serial.println(iOutTemp);
//digitalWrite(pinMapOut[z], iOutTemp);
}
}
break;
case 2: // get the values for output pins
/*
Serial.print(F(" oC Pins:"));
Serial.print(rxChar);
//Serial.print(F(" oPins:"));
//byPinsOutput = rxChar;
//Serial.println(byPinsOutput);
for (byte byPinCounter = 0; byPinCounter < byPinsInput; byPinCounter++)
{
if(byPinCounter < byPinsOutput) // set only the output pins ????
{
Serial.print(F(" PinOutM:"));
Serial.print(pinMap[bPinout]);
Serial.print(F(" ~ "));
//pinMode(pinMap[bPinout], OUTPUT);
}
else // set the input pins
{
Serial.print(F(" PinInM:"));
Serial.print(pinMap[bPinout]);
Serial.print(F(" ~ "));
//pinMode(pinMap[bPinout], INPUT);
}
}
Serial.println();
*/
break;
case 3: // get the pullup values for input pins
/*
for (int nCounter = 0; nCounter < byPins; nCounter++)
{
uint8_t iDirTemp = 0;
if (nCounter >= byPinsInput) // only for input pins
{
iDirTemp = ((rxChar >> nCounter) & 1);
Serial.print(F(" PullUp:"));
Serial.print(pinMap[nCounter]);
Serial.print(F(" Dir:"));
Serial.print(iDirTemp);
Serial.print(F(" ~ "));
//digitalWrite(pinMap[n], iDirTemp);
}
}
Serial.println();
*/
break;
}
}
}
void encodeTx() // send the input pin data + encoder positions
{
String sTest = "";
uint8_t iDigitalStack = 0;
for(byte byCounter = 0; byCounter < byPinsInput; byCounter++)
{
// int dummy = byCounter;
if (byCounter >= 2) // greater than 2 are digital
{
//int moredummy = byCounter;
if(digitalRead(pinMapIn[byCounter-2]))
{
iDigitalStack |= (1<<byCounter);
}
} else
{
adcResult = analogRead(pinMapIn[byCounter]); // send values for analog pin
sprintf(ReplyBuffer, "%4d", adcResult);
sTest += ReplyBuffer;
sTest +=",";
}
}
// output the chain of pinMap
sprintf(ReplyBuffer,"%3d", iDigitalStack);
sTest += ReplyBuffer;
sTest += ",";
/*
Serial.print(F("R-PinMap buffer: "));
Serial.print(ReplyBuffer);
Serial.print(F(" ~ "));
*/
// The following is legacy encoder live state transmission
sprintf(ReplyBuffer,"%4d", cCounter[0]);
sTest += ReplyBuffer;
sTest += ",";
/*
Serial.print(F("mpg 0: "));
Serial.print(ReplyBuffer);
Serial.print(F(" "));
*/
sprintf(ReplyBuffer,"%4d", cCounter[1]);
sTest += ReplyBuffer;
sTest += "~";
sTest.toCharArray(ReplyBuffer,sTest.length());
if (cDebug)
{
Serial.print(F("sTest:"));
Serial.print(sTest);
// sTest.toCharArray(ReplyBuffer,iPacketSize);
Serial.print(F(" Reply:"));
for(int iTemp=0;iTemp<sTest.length();iTemp++)
Serial.write(ReplyBuffer[iTemp]);
}
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
//Udp.beginPacket(ipRemote, portRemote);
Udp.write(ReplyBuffer);
Udp.endPacket();
}
void charClear (char * cData)
{
for( int iCounter = 0; iCounter < sizeof(cData); ++iCounter )
cData[iCounter] = (char)0;
}
char *skip_spaces(const char *str)
{
while (isspace(*str))
++str;
return (char *)str;
}
;}