ESP32-S2, TWAI crash WiFi.

[FedericoAndrades]

Board

ESP32-S2-Wrover

Device Description

ESP32-S2-wrover on PCB prototype

Hardware Configuration

GPIO 5 is CAN_TX
GPIO 4 is CAN_RX

Version

v2.0.7

IDE Name

Arduino IDE

Operating System

Windows11

Flash frequency

80Mhz

PSRAM enabled

no

Upload speed

Internal USB 921600

Description

Hi, sorry for my english, it's from google.
I want to use the ESP32-S2-wrover with WiFi and TWAI, but when I enable the TWAI port the WiFi crashes, and I can't get it to work.
I have reduced it to the fact that if the GPIO5 port is not defined as an output and in a low state, the WiFi does not work, but the TWAI driver has the GPIO5 on the CAN_TX pin.
Any idea where the problem could be, or any solution?
Thanks

Sketch

/*
 WiFi Web Server LED Blink

 A simple web server that lets you blink an LED via the web.
 This sketch will print the IP address of your WiFi Shield (once connected)
 to the Serial monitor. From there, you can open that address in a web browser
 to turn on and off the LED on pin 5.

 If the IP address of your shield is yourAddress:
 http://yourAddress/H turns the LED on
 http://yourAddress/L turns it off

 This example is written for a network using WPA2 encryption. For insecure
 WEP or WPA, change the Wifi.begin() call and use Wifi.setMinSecurity() accordingly.

 Circuit:
 * WiFi shield attached
 * LED attached to pin 5

 created for arduino 25 Nov 2012
 by Tom Igoe

ported for sparkfun esp32 
31.01.2017 by Jan Hendrik Berlin
 
 */
#include "Arduino.h"
#include "FS.h"
#include "FFat.h"

#include <WiFi.h>

const char* ssid     = "Andrades_LAB";
const char* password = "34341189";

#include <SimpleFTPServer.h>

WiFiServer server(80);

FtpServer ftpSrv;

void _callback(FtpOperation ftpOperation, unsigned int freeSpace, unsigned int totalSpace){
  switch (ftpOperation) {
    case FTP_CONNECT:
      Serial.println(F("FTP: Connected!"));
      break;
    case FTP_DISCONNECT:
      Serial.println(F("FTP: Disconnected!"));
      break;
    case FTP_FREE_SPACE_CHANGE:
      Serial.printf("FTP: Free space change, free %u of %u!\n", freeSpace, totalSpace);
      break;
    default:
      break;
  }
};
void _transferCallback(FtpTransferOperation ftpOperation, const char* name, unsigned int transferredSize){
  switch (ftpOperation) {
    case FTP_UPLOAD_START:
      Serial.println(F("FTP: Upload start!"));
      break;
    case FTP_UPLOAD:
      Serial.printf("FTP: Upload of file %s byte %u\n", name, transferredSize);
      break;
    case FTP_TRANSFER_STOP:
      Serial.println(F("FTP: Finish transfer!"));
      break;
    case FTP_TRANSFER_ERROR:
      Serial.println(F("FTP: Transfer error!"));
      break;
    default:
      break;
  }

  /* FTP_UPLOAD_START = 0,
   * FTP_UPLOAD = 1,
   *
   * FTP_DOWNLOAD_START = 2,
   * FTP_DOWNLOAD = 3,
   *
   * FTP_TRANSFER_STOP = 4,
   * FTP_DOWNLOAD_STOP = 4,
   * FTP_UPLOAD_STOP = 4,
   *
   * FTP_TRANSFER_ERROR = 5,
   * FTP_DOWNLOAD_ERROR = 5,
   * FTP_UPLOAD_ERROR = 5
   */
};

void setup()
{
    Serial.begin(115200);
    while(!Serial);

    //FFat.format();
    
    pinMode(5, OUTPUT);      // set the LED pin mode
    digitalWrite( 5 , HIGH); // Is not LOW WIFI not work!!!!

    delay(10);

    // We start by connecting to a WiFi network

    Serial.println();
    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);

    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }

    Serial.println("");
    Serial.println("WiFi connected.");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
    
    server.begin();

  /////FTP Setup, ensure FFAT is started before ftp;  /////////
  Serial.print(F("Inizializing FS..."));
  if (FFat.begin(true)){
      Serial.println(F("done."));
  }else{
      Serial.println(F("fail."));
      while (true) { delay(1000); };
  }

  ftpSrv.setCallback(_callback);
  ftpSrv.setTransferCallback(_transferCallback);

  Serial.println("Start FTP with user: user and passwd: password!");
  ftpSrv.begin("user","password");    //username, password for ftp.   (default 21, 50009 for PASV)

}

void loop(){
 WiFiClient client = server.available();   // listen for incoming clients

  if (client) {                             // if you get a client,
    Serial.println("New Client.");           // print a message out the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        if (c == '\n') {                    // if the byte is a newline character

          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println();

            // the content of the HTTP response follows the header:
            client.print("Click <a href=\"/H\">here</a> to turn the LED on pin 5 on.<br>");
            client.print("Click <a href=\"/L\">here</a> to turn the LED on pin 5 off.<br>");

            // The HTTP response ends with another blank line:
            client.println();
            // break out of the while loop:
            break;
          } else {    // if you got a newline, then clear currentLine:
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }

        // Check to see if the client request was "GET /H" or "GET /L":
        if (currentLine.endsWith("GET /H")) {
          digitalWrite(5, HIGH);               // GET /H turns the LED on
        }
        if (currentLine.endsWith("GET /L")) {
          digitalWrite(5, LOW);                // GET /L turns the LED off
        }
      }
    }
    // close the connection:
    client.stop();
    Serial.println("Client Disconnected.");
  }
    ftpSrv.handleFTP();        //make sure in loop you call handleFTP()!!

}

Debug Message

ESP-ROM:esp32s2-rc4-20191025<CR><LF>
Build:Oct 25 2019<CR><LF>
rst:0x3 (RTC_SW_SYS_RST),boot:0x0 (DOWNLOAD(USB/UART0/1/SPI))<CR><LF>
Saved PC:0x40026a55<CR><LF>
waiting for download<CR><LF>
ESP-ROM:esp32s2-rc4-20191025<CR><LF>
Build:Oct 25 2019<CR><LF>
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)<CR><LF>
Saved PC:0x4002897f<CR><LF>
SPIWP:0xee<CR><LF>
mode:DIO, clock div:1<CR><LF>
load:0x3ffe6100,len:0x524<CR><LF>
load:0x4004c000,len:0xa70<CR><LF>
load:0x40050000,len:0x2958<CR><LF>
entry 0x4004c18c<CR><LF>
[320537][D][esp32-hal-tinyusb.c:675] tinyusb_enable_interface(): Interface CDC enabled<CR><LF>
[320537][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=80, ...)<CR><LF>
[320540][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=21, ...)<CR><LF>
[320547][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=50009, ...)<CR><LF>
[320556][D][esp32-hal-tinyusb.c:564] tinyusb_load_enabled_interfaces(): Load Done: if_num: 2, descr_len: 75, if_mask: 0x10<CR><LF>
[329075][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 0 - WIFI_READY<CR><LF>
[329128][V][WiFiGeneric.cpp:340] _arduino_event_cb(): STA Started<CR><LF>
[329129][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 2 - STA_START<CR><LF>
[329131][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>
[331560][V][WiFiGeneric.cpp:362] _arduino_event_cb(): STA Disconnected: SSID: Andrades_LAB, BSSID: 00:00:00:00:00:00, Reason: 201<CR><LF>
[331560][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 5 - STA_DISCONNECTED<CR><LF>
[331568][W][WiFiGeneric.cpp:955] _eventCallback(): Reason: 201 - NO_AP_FOUND<CR><LF>
[331575][D][WiFiGeneric.cpp:975] _eventCallback(): WiFi Reconnect Running<CR><LF>
[331582][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>
[334006][V][WiFiGeneric.cpp:362] _arduino_event_cb(): STA Disconnected: SSID: Andrades_LAB, BSSID: 00:00:00:00:00:00, Reason: 201<CR><LF>
[334006][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 5 - STA_DISCONNECTED<CR><LF>
[334014][W][WiFiGeneric.cpp:955] _eventCallback(): Reason: 201 - NO_AP_FOUND<CR><LF>
[334020][D][WiFiGeneric.cpp:979] _eventCallback(): WiFi AutoReconnect Running<CR><LF>
[334028][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>
[336453][V][WiFiGeneric.cpp:362] _arduino_event_cb(): STA Disconnected: SSID: Andrades_LAB, BSSID: 00:00:00:00:00:00, Reason: 201<CR><LF>
[336454][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 5 - STA_DISCONNECTED<CR><LF>
[336461][W][WiFiGeneric.cpp:955] _eventCallback(): Reason: 201 - NO_AP_FOUND<CR><LF>
[336468][D][WiFiGeneric.cpp:979] _eventCallback(): WiFi AutoReconnect Running<CR><LF>
[336476][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>
[338899][V][WiFiGeneric.cpp:362] _arduino_event_cb(): STA Disconnected: SSID: Andrades_LAB, BSSID: 00:00:00:00:00:00, Reason: 201<CR><LF>
[338900][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 5 - STA_DISCONNECTED<CR><LF>
[338907][W][WiFiGeneric.cpp:955] _eventCallback(): Reason: 201 - NO_AP_FOUND<CR><LF>
[338914][D][WiFiGeneric.cpp:979] _eventCallback(): WiFi AutoReconnect Running<CR><LF>
[338922][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>
[341351][V][WiFiGeneric.cpp:362] _arduino_event_cb(): STA Disconnected: SSID: Andrades_LAB, BSSID: 00:00:00:00:00:00, Reason: 201<CR><LF>
[341352][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 5 - STA_DISCONNECTED<CR><LF>
[341359][W][WiFiGeneric.cpp:955] _eventCallback(): Reason: 201 - NO_AP_FOUND<CR><LF>
[341366][D][WiFiGeneric.cpp:979] _eventCallback(): WiFi AutoReconnect Running<CR><LF>
[341374][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0<CR><LF>

Other Steps to Reproduce

No response

I have checked existing issues, online documentation and the Troubleshooting Guide

• I confirm I have checked existing issues, online documentation and Troubleshooting guide.

[FedericoAndrades]

with "digitalWrite( 5 , LOW );"
Wifi work normal.

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x40028982
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0x524
load:0x4004c000,len:0xa70
load:0x40050000,len:0x2958
entry 0x4004c18c
[323229][D][esp32-hal-tinyusb.c:675] tinyusb_enable_interface(): Interface CDC enabled
[323230][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=80, ...)
[323233][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=21, ...)
[323240][V][WiFiServer.h:42] WiFiServer(): WiFiServer::WiFiServer(port=50009, ...)
[323248][D][esp32-hal-tinyusb.c:564] tinyusb_load_enabled_interfaces(): Load Done: if_num: 2, descr_len: 75, if_mask: 0x10
[329857][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 0 - WIFI_READY
[329892][V][WiFiGeneric.cpp:340] _arduino_event_cb(): STA Started
[329893][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 2 - STA_START
[329895][V][WiFiGeneric.cpp:97] set_esp_interface_ip(): Configuring Station static IP: 0.0.0.0, MASK: 0.0.0.0, GW: 0.0.0.0
[329933][V][WiFiGeneric.cpp:355] _arduino_event_cb(): STA Connected: SSID: Andrades_LAB, BSSID: f8:d1:11:55:04:60, Channel: 9, Auth: WPA_WPA2_PSK
[329935][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 4 - STA_CONNECTED
[330071][V][WiFiGeneric.cpp:369] _arduino_event_cb(): STA Got New IP:192.168.1.107
[330071][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 7 - STA_GOT_IP
[330074][D][WiFiGeneric.cpp:996] _eventCallback(): STA IP: 192.168.1.107, MASK: 255.255.255.0, GW: 192.168.1.1

[mrengineer7777]

That's very odd. I don't know of any reason why GPIO 5 would cause WiFi to stop working. Two guesses:

1. It could be related to TinyUSB
2. SimpleFTPServer might be interfering. Try temporarily commenting out that part of the code.

[mrengineer7777]

GPIO 5 is CAN_TX
GPIO 4 is CAN_RX

Wait what is this hardware config?

[FedericoAndrades]

In prototype Board GPIO4 and GPIO5 is connected to CAN driver MCP2455, and anothers GPIO to Serial interfase. but the problem come wen GPIO5 is not OUTPUT and state LOW.

[FedericoAndrades]

I upload WiFiScan example and set GPIO5 has OUTPUT and HIGH state and no read any wifi SSID .

/*

• This sketch demonstrates how to scan WiFi networks.
• The API is based on the Arduino WiFi Shield library, but has significant changes as newer WiFi functions are supported.
• E.g. the return value of encryptionType() different because more modern encryption is supported.
  */
  #include "WiFi.h"

void setup()
{
Serial.begin(115200);
pinMode( 5 , OUTPUT );
digitalWrite( 5 , HIGH );

// Set WiFi to station mode and disconnect from an AP if it was previously connected.
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);

Serial.println("Setup done");

}

void loop()
{
Serial.println("Scan start");

// WiFi.scanNetworks will return the number of networks found.
int n = WiFi.scanNetworks();
Serial.println("Scan done");
if (n == 0) {
    Serial.println("no networks found");
} else {
    Serial.print(n);
    Serial.println(" networks found");
    Serial.println("Nr | SSID                             | RSSI | CH | Encryption");
    for (int i = 0; i < n; ++i) {
        // Print SSID and RSSI for each network found
        Serial.printf("%2d",i + 1);
        Serial.print(" | ");
        Serial.printf("%-32.32s", WiFi.SSID(i).c_str());
        Serial.print(" | ");
        Serial.printf("%4d", WiFi.RSSI(i));
        Serial.print(" | ");
        Serial.printf("%2d", WiFi.channel(i));
        Serial.print(" | ");
        switch (WiFi.encryptionType(i))
        {
        case WIFI_AUTH_OPEN:
            Serial.print("open");
            break;
        case WIFI_AUTH_WEP:
            Serial.print("WEP");
            break;
        case WIFI_AUTH_WPA_PSK:
            Serial.print("WPA");
            break;
        case WIFI_AUTH_WPA2_PSK:
            Serial.print("WPA2");
            break;
        case WIFI_AUTH_WPA_WPA2_PSK:
            Serial.print("WPA+WPA2");
            break;
        case WIFI_AUTH_WPA2_ENTERPRISE:
            Serial.print("WPA2-EAP");
            break;
        case WIFI_AUTH_WPA3_PSK:
            Serial.print("WPA3");
            break;
        case WIFI_AUTH_WPA2_WPA3_PSK:
            Serial.print("WPA2+WPA3");
            break;
        case WIFI_AUTH_WAPI_PSK:
            Serial.print("WAPI");
            break;
        default:
            Serial.print("unknown");
        }
        Serial.println();
        delay(10);
    }
}
Serial.println("");

// Delete the scan result to free memory for code below.
WiFi.scanDelete();

// Wait a bit before scanning again.
delay(5000);

}

Monitor USB
12:43:17.240 -> Scan start
12:43:19.439 -> Scan done
12:43:19.439 -> no networks found
12:43:19.439 ->
12:43:24.432 -> Scan start
12:43:26.630 -> Scan done
12:43:26.630 -> no networks found
12:43:26.630 ->
12:43:31.632 -> Scan start
12:43:33.830 -> Scan done
12:43:33.830 -> no networks found
12:43:33.830 ->
12:43:38.821 -> Scan start
12:43:41.012 -> Scan done
12:43:41.012 -> no networks found
12:43:41.012 ->
12:43:46.051 -> Scan start
12:43:48.246 -> Scan done
12:43:48.246 -> no networks found

Core Monitor

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0xc (RTC_SW_CPU_RST),boot:0x8 (SPI_FAST_FLASH_BOOT)
Saved PC:0x4002897f
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0x524
load:0x4004c000,len:0xa70
load:0x40050000,len:0x2958
entry 0x4004c18c
[320013][D][esp32-hal-tinyusb.c:675] tinyusb_enable_interface(): Interface CDC enabled
[320014][D][esp32-hal-tinyusb.c:564] tinyusb_load_enabled_interfaces(): Load Done: if_num: 2, descr_len: 75, if_mask: 0x10
[320033][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 0 - WIFI_READY
[320086][V][WiFiGeneric.cpp:340] _arduino_event_cb(): STA Started
[320087][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 2 - STA_START
[322386][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 128, Status: 0, Results: 0
[322386][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[329587][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 129, Status: 0, Results: 0
[329588][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[336790][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 130, Status: 0, Results: 0
[336790][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[343993][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 131, Status: 0, Results: 0
[343993][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE

[FedericoAndrades]

And whit GPIO5 OUTPUT and LOW

USB monitor
12:48:41.102 -> Scan done
12:48:41.102 -> 4 networks found
12:48:41.102 -> Nr | SSID | RSSI | CH | Encryption
12:48:41.102 -> 1 | Andrades_LAB | -45 | 9 | WPA+WPA2
12:48:41.102 -> 2 | Speedy-Fibra-Coralia | -85 | 6 | WPA2
12:48:41.102 -> 3 | Fibertel WiFi877 2.4GHz | -89 | 1 | WPA2
12:48:41.102 -> 4 | MovistarFibra-E02968 | -90 | 6 | WPA2
12:48:41.149 ->
12:48:46.145 -> Scan start
12:48:48.956 -> Scan done
12:48:48.956 -> 4 networks found
12:48:48.956 -> Nr | SSID | RSSI | CH | Encryption
12:48:48.956 -> 1 | Andrades_LAB | -51 | 9 | WPA+WPA2
12:48:48.956 -> 2 | Speedy-Fibra-Coralia | -85 | 6 | WPA2
12:48:48.956 -> 3 | Fibertel WiFi877 2.4GHz | -88 | 1 | WPA2
12:48:48.956 -> 4 | MovistarFibra-E02968 | -90 | 6 | WPA2
12:48:48.956 ->
12:48:53.969 -> Scan start
12:48:56.786 -> Scan done
12:48:56.786 -> 4 networks found
12:48:56.786 -> Nr | SSID | RSSI | CH | Encryption
12:48:56.786 -> 1 | Andrades_LAB | -46 | 9 | WPA+WPA2
12:48:56.786 -> 2 | Speedy-Fibra-Coralia | -85 | 6 | WPA2
12:48:56.786 -> 3 | Fibertel WiFi877 2.4GHz | -87 | 1 | WPA2
12:48:56.830 -> 4 | MovistarFibra-E02968 | -87 | 6 | WPA2

Core Monitor
ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0x524
load:0x4004c000,len:0xa70
load:0x40050000,len:0x2958
entry 0x4004c18c
[ 573][D][esp32-hal-tinyusb.c:675] tinyusb_enable_interface(): Interface CDC enabled
[ 574][D][esp32-hal-tinyusb.c:564] tinyusb_load_enabled_interfaces(): Load Done: if_num: 2, descr_len: 75, if_mask: 0x10
[ 593][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 0 - WIFI_READY
[ 628][V][WiFiGeneric.cpp:340] _arduino_event_cb(): STA Started
[ 629][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 2 - STA_START
[ 2444][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 128, Status: 0, Results: 5
[ 2445][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[ 10294][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 129, Status: 0, Results: 4
[ 10294][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[ 18139][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 130, Status: 0, Results: 4
[ 18139][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE
[ 25984][V][WiFiGeneric.cpp:383] _arduino_event_cb(): SCAN Done: ID: 131, Status: 0, Results: 4
[ 25984][D][WiFiGeneric.cpp:931] _eventCallback(): Arduino Event: 1 - SCAN_DONE

[FedericoAndrades]

Yes, and
GPIO 1 -> 4k7 Pullup 3.3v
GPIO 2 -> 560 + LED + GND
GPIO 3 -> 560 + LED + GND
GPIO 4 -> RX Can driver
GPIO 5 -> TX Can driver
GPIO15 -> RTS RS485 interfase
GPIO17 -> TX RS232 inferfase
GPIO18 -> RX RS232 inferfase
GPIO19 -> USB -D
GPIO20 -> USB +D
RX0 -> RX RS485 inferfase
TX0 -> TX RS485 interfase
Setup Arduino

[mrengineer7777]

So you are saying that setting GPIO 5 to OUTPUT, then HIGH causes WiFi scan to fail? I can test that. I added those two lines to one of my test projects. It still scans and connects properly. Note: GPIO 5 is not connected to anything on my project.

Try disconnecting the wire between GPIO 5 and your CAN driver. You may have a hardware issue.

[FedericoAndrades]

So you are saying that setting GPIO 5 to OUTPUT, then HIGH causes WiFi scan to fail? I can test that. I added those two lines to one of my test projects. It still scans and connects properly. Note: GPIO 5 is not connected to anything on my project.

Try disconnecting the wire between GPIO 5 and your CAN driver. You may have a hardware issue.

Yes, I just found the hardware problem, a poorly soldered resistor in the CAN adapter made 5V reach the ESP32 through pin 4 when the CAN channel was idle.
Sorry, it didn't seem to be unsoldered and when I touched it with the tester it moved and made contact.
It drove me crazy for 2 days, I even changed the ESP32 thinking it was burned.