Soft Reset of the ESP8266

[rajeshdoshi]

Hi, I have connected ESP8266 to ENC28J60. Using 5 and 4 pins for CS and Reset respectively. Following code works beautifully well.

include

typedef unsigned char N8;

define LED D0

EthernetServer server(port); uint8_t mac[6] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED}; IPAddress ip = {192,168,131,171}; uint8_t myDns[] = {192,168,131,1};

unsigned long ledmil; unsigned char ledon=0; unsigned char xmbuf[60]; unsigned char datrdy=0; int xmcnt;

//======================================================================= // Power on setup //======================================================================= void setup() { Serial.begin(9600); Serial.println();

pinMode(4, OUTPUT); digitalWrite(4,LOW); delay(100); digitalWrite(4,HIGH);

Ethernet.init(5); Ethernet.begin(mac,ip,myDns); //Connect to wifi

Serial.println(Ethernet.localIP()); server.begin(); ledmil=millis(); } //======================================================================= // Loop //======================================================================= unsigned char buf; unsigned long curmil;

void loop() { EthernetClient client = server.available();

if (client) { if(client.connected()) { Serial.println("Client Connected"); }

while(client.connected()){      
  while(client.available()>0){
    // read data from the connected client
    buf=client.read();
    Serial.write(buf); 
    if(buf=='X')
      { sprintf((char *)xmbuf,"Hello World1"); datrdy=1; }
    else if(buf=='B')
      { sprintf((char *)xmbuf,"Hello World2"); datrdy=1; }
    Ethernet.maintain();
  }
  //Send Data to connected client
  while(Serial.available()>0)
 {
    client.write(Serial.read());
  }

} client.stop(); Serial.println("Client disconnected");
Ethernet.maintain(); } Ethernet.maintain(); }//=======================================================================

However, moment I replace while(Serial.available()>0) { client.write(Serial.read()); }

with if(datrdy) { client.write (xmbuf,13'); datrdy=0; } ESP8266 starts resetting randomly on receipt of data.

Soft WDT reset >>>stack>>> ctx: cont sp: 3ffffd10 end: 3fffffc0 offset: 01a0 3ffffeb0: 3ffe85d9 3ffee852 00000000 40100298 3ffffec0: 3ffe85d9 3ffee852 39000000 40203bcf 3ffffed0: 3ffee852 3fffff80 3ffee852 3ffee8f8 3ffffee0: 3ffee852 3fffff80 00000039 40203d60 3ffffef0: 00000000 00000000 3ffee5a7 4020420e 3fffff00: 00001d83 3ffe0001 40100209 00000000 3fffff10: 00001f84 3fffff60 3fffff80 3ffee8f8 3fffff20: 3fffdad0 3ffee538 3ffee5a7 3ffee8f8 3fffff30: 3fffdad0 3fffff80 3ffee5a7 402028cd 3fffff40: 3fffdad0 3ffee538 3ffee539 3ffee8f8 3fffff50: 3fffdad0 3fffff80 3fffff80 40202d8c 3fffff60: 3fffdad0 0000000a 3ffee539 40202f1e 3fffff70: 3fffdad0 3ffee538 3ffee539 40202717 3fffff80: 40208f54 00000000 000003e8 40100168 3fffff90: 00000000 3ffee5aa 3ffee8e4 40100189 3fffffa0: feefeffe 00000000 3ffee8e4 402062ec 3fffffb0: feefeffe feefeffe 3ffe85ec 40100bc9 << --------------- CUT HERE FOR EXCEPTION DECODER --------------- I am clueless about it as of now.

[JAndrassy]

use the stack decoder IDE plugin https://github.com/me-no-dev/EspExceptionDecoder

[rajeshdoshi]

Hi. Thanks for your reply and help. I have found that it is the delay which makes the difference. If I do not have delay called, the ESP resets abruptly. I have no explanation for it.