Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed)

[MinePro120]

Hello there! Here's my code :

#include <WiFi.h>
#include <driver/adc.h>

#define AUDIO_BUFFER_MAX 1600
#define SSID "***"
#define PASSWD "***"
#define PORT 6120 // IANA unassigned port

uint8_t audioBuffer[AUDIO_BUFFER_MAX];
uint8_t transmitBuffer[AUDIO_BUFFER_MAX];
uint32_t bufferPointer = 0;
int sleepCounter = 0;
bool transmitNow = false;
WiFiClient client;
IPAddress host;
hw_timer_t * timer = NULL; // Timer
portMUX_TYPE timerMux = portMUX_INITIALIZER_UNLOCKED;


void IRAM_ATTR onTimer()
{
portENTER_CRITICAL_ISR (&timerMux); // ISR start
int adcVal = adc1_get_voltage (ADC1_CHANNEL_0); // Reads the ADC
uint8_t value = map (adcVal, 0 , 4096, 0, 255); // Converts the value to 0..255 (8bit)
audioBuffer[bufferPointer] = value; // Stores the value
bufferPointer++;
if (bufferPointer == AUDIO_BUFFER_MAX) // When the buffer is full
{
bufferPointer = 0;
memcpy (transmitBuffer, audioBuffer, AUDIO_BUFFER_MAX); // Copies buffer into a second buffer
transmitNow = true; // Sets the value true so we know that we can transmit now
}
portEXIT_CRITICAL_ISR (&timerMux); // ISR end
}


void deepSleep (int sec) // Deep sleep in seconds
{
Serial.print ("[DEBUG/ESP32] Going to sleep for ");
Serial.print (sec);
Serial.println (" seconds");
Serial.flush ();
esp_sleep_enable_timer_wakeup (sec * 1000000);
esp_deep_sleep_start ();
}


void setup()
{
Serial.begin (115200);
WiFi.mode (WIFI_STA);
adc1_config_width (ADC_WIDTH_12Bit); // Configures the ADC
adc1_config_channel_atten (ADC1_CHANNEL_0, ADC_ATTEN_0db); // Connects the ADC 1 with channel 0 (GPIO 36)
timer = timerBegin (0, 80, true); // 80 Prescaler
timerAttachInterrupt (timer, &onTimer, true); // Binds the handling function to our timer
timerAlarmWrite (timer, 125, true);
timerAlarmEnable (timer);
pinMode (LED_BUILTIN, OUTPUT); // Status LED
}


void loop()
{
if ((WiFi.status () != WL_CONNECTED) || !client.connected ())
{
digitalWrite (LED_BUILTIN, LOW);
if (sleepCounter == 30) // Sleeps 30min after 15min of inactivity
deepSleep (1800);
int timeoutCounter = 0;
if (WiFi.status () != WL_CONNECTED)
{
Serial.print ("[DEBUG/WIFI] (Re)connecting to network");
WiFi.begin (SSID, PASSWD);
while ((WiFi.status () != WL_CONNECTED) && (timeoutCounter < 30))
{
delay (1000);
Serial.print ('.');
timeoutCounter++;
}
if (timeoutCounter == 30)
{
Serial.println ("\n[DEBUG/WIFI] Connection timeout");
sleepCounter++;
}
else
{
Serial.print ("\n[DEBUG/WIFI] Connected with IP : ");
Serial.print (WiFi.localIP ());
Serial.print (", at ");
Serial.print (WiFi.RSSI ());
Serial.print (" dBm");
}
}
else
{
host = WiFi.gatewayIP ();
Serial.print ("[DEBUG/WIFI] (Re)connecting to host at ");
Serial.println (host);
while (!client.connect (host, PORT) && (timeoutCounter < 30))
{
delay (1000);
Serial.print ('.');
timeoutCounter++;
}
if (timeoutCounter == 30)
{
Serial.println ("\n[DEBUG/WIFI] Connection timeout");
sleepCounter++;
}
else
{
digitalWrite (LED_BUILTIN, HIGH);
Serial.println ("\n[DEBUG/WIFI] Connected to host");
}
}
}
else
{
sleepCounter = 0;
if (transmitNow) // Checks if the buffer is full
{
transmitNow = false;
client.write ((const uint8_t *) audioBuffer, sizeof (audioBuffer)); // Sends the buffer to the host
}
}
}

,which is a modified version of the code found here : https://www.hackster.io/julianso/esp32- ... mer-52bd7e, that works fine. So, whenever I upload the code to my WeMos WiFi&Bluetooth Battery, the esp32 restarts almost immediately with the following log :

[DEBUG/WIFI] (Re)connecting to networkGuru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed)
Core 1 register dump:
PC : 0x40129e5c PS : 0x00060034 A0 : 0x80081440 A1 : 0x3ffbe790
A2 : 0x3ffbebe8 A3 : 0x20000000 A4 : 0x00000400 A5 : 0x00000000
A6 : 0x3ffc21e0 A7 : 0xffffffff A8 : 0x8008104f A9 : 0x3ffbe760
A10 : 0x00000000 A11 : 0x3ffba264 A12 : 0x00000001 A13 : 0x00000001
A14 : 0x00060021 A15 : 0x00000000 SAR : 0x00000014 EXCCAUSE: 0x00000007
EXCVADDR: 0x00000000 LBEG : 0x00000000 LEND : 0x00000000 LCOUNT : 0x00000000
Core 1 was running in ISR context:
EPC1 : 0x40086fff EPC2 : 0x00000000 EPC3 : 0x00000000 EPC4 : 0x40129e5c

Backtrace: 0x40129e5c:0x3ffbe790 0x4008143d:0x3ffbe7b0 0x40084d49:0x3ffbe7d0 0x40086ffc:0x3ffba190 0x40083167:0x3ffba1b0 0x40089155:0x3ffba1d0

Rebooting...
ets Jun 8 2016 00:22:57

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1044
load:0x40078000,len:8896
load:0x40080400,len:5816
entry 0x400806ac

The backtrace is different in each crash. I tried using backtrace decoder with no results. But I found out that if I uncomment the line "WiFi.begin (SSID, PASSWD);" the sketch works as expected. Things I tried based on google search results :
1) Checking the power supply (my board comes with a 18650 battery I could use to power it without using my PC).
2) Using ESP.eraseConfig () (the ESP class did not contain this function though)
3) Using WiFi.persistent (false)

[ESP_Sprite]

If the crash is different but goes away if you disable WiFi, it probably still is a power supply issue. Can you check the LDO on your WiFi board? There's a known issue where some boards only have a LDO that can deliver 150mA or so, causing the ESP32 to crash when you turn on WiFi.

[MinePro120]

I did some more testing. I moved the WiFi.begin() to setup() and used only WiFi.recconect to loop(). Works fine now. So I guess it's not power related.