Enc28j60 Hangs or freeze

[iNation]

Hi, i am a newbee...
i have been trying to connect ENC28j60 with ESP 32s .. CS Pin 14.
i m able to communicate with my HMI with IP 192.168.1.100 and getting modbus tcp replies from it..
after running for 7 hours it freezes while sending the modbus request data to the HMI.
currently i am using WDT to reset if the system if it is not responding for more than 2 minutes...
i am trying to poll for every one minute... no memory leaks...
here is my code.. (removed the WDT part)..

#include <EthernetENC.h>
#include <SPI.h>

//modbus tcp
const int MODBUS_CONNECT_ERROR = -10;
const int MODBUS_NO_RESPONSE = -11;
const byte FNC_READ_REGS = 0x03;
const byte FNC_WRITE_SINGLE = 0x06;
const byte FNC_ERR_FLAG = 0x80;
byte mac[] = { 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02 };
const int ETH_CS_PIN = 14;
const IPAddress isgAddress(192, 168, 1, 100);
EthernetClient client;
int clientstatus = 0;
IPAddress ip(192, 168, 1, 10);
IPAddress gateway(192, 168, 1, 1);
IPAddress DNSServer(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
String hostname = "ESP32";
int rst_Ethernet = 0;
int client_value = 0;

void setup() {
  Serial.begin(115200);
  SPI.begin();
  pinMode(14, OUTPUT);
  digitalWrite(14, LOW);
  delay(2000);
  Serial.println("Configuring Ethernet");
  pinMode(4, OUTPUT);
  digitalWrite(4, LOW);
  delay(100);
  digitalWrite(4, HIGH);
  //pinMode(4,INPUT);
  delay(3000);
  Ethernet.init(ETH_CS_PIN);
  Ethernet.begin(mac, ip, gateway, DNSServer, subnet);
  ethernet_connect();
}

int tests(Client &client) {
  short regs[16];
  int res = modbusRequest(client, 1, 0, 8, regs);
  if (res != 0)
    return res;
  return 0;
}

void ethernet_connect() {
  client.connect(isgAddress, 8888);
  while (!client.connected()) {
    client.connect(isgAddress, 8888);
    Serial.println("Trying to Connect TCP...");
    delay(3000);
  }
  if (client.connected()) {
    client.setTimeout(1000);
    Serial.println("client connected");
    clientstatus = 0;
  } else {
    
    Serial.println("connection failed");
  }
  
}

int modbusRequest(Client &client, byte uid, unsigned int addr, byte len,
    short *regs) {
  const byte CODE_IX = 7;
  const byte ERR_CODE_IX = 8;
  const byte LENGTH_IX = 8;
  const byte DATA_IX = 9;
  
  byte request[] = { 0, 1, 0, 0, 0, 6, uid, FNC_READ_REGS, (byte) (addr / 256),
      (byte) (addr % 256), 0, len };
  Serial.println("Request");
  String bt_data = "";
  for (int i = 0; i < sizeof(request); ++i) {
    Serial.print(request[i], HEX);
    Serial.print(' ');
    bt_data += String(request[i], HEX);
  }
  Serial.println("");
  
  unsigned long Eth_currentMillis = millis(); // store the current time
      
  client.write(request, sizeof(request));
  int respDataLen = (len * 2);
  byte response[max((int) DATA_IX, respDataLen)];
  Serial.println("Response");
  int readLen = client.readBytes(response, DATA_IX);
  if (readLen < DATA_IX) {
    return MODBUS_NO_RESPONSE;
  }
  switch (response[CODE_IX]) {
    case FNC_READ_REGS:
      break;
    case (FNC_ERR_FLAG | FNC_READ_REGS):
      return response[ERR_CODE_IX]; // 0x01, 0x02, 0x03 or 0x11
    default:
      return -3;
  }
  readLen = client.readBytes(response, respDataLen);
  String br_data = "";
  for (int i = 0; i < respDataLen; ++i) {
    Serial.print(response[i], HEX);
    Serial.print(' ');
    br_data += String(response[i], HEX);
  }
  return 0;
}

void loop() {
  Ethernet.maintain();
  int res = tests(client);
  if (res != 0) {
    Serial.print("modbus error ");
    Serial.println(res);
  }
  Serial.println(ESP.getFreeHeap());
  delay(100);
}

[Juraj Andrássy]

hello. if you use the version from Library Manager, please try GitHub master version. there is one fix

[iNation]

i have downloaded the master version (this version) of yours from github and implemented in my device.. will let you know if the issues still persists or not.. thanks a lot for a quick reply....

Update: 12 hrs no hanging issues as of now...

[iNation]

Hi it seems issue got solved…. It’s been running for more than 42 hours now… thanks for your support …

[Juraj Andrássy]

thank you for the feedback.

[Juraj Andrássy]

version 2.0.3 with the fix should be available in Library Manager in a few hours