ESP32-WROOM-32E stuck in watchdog (?) loop after uploading Arduino code

[Sophi9999]

Hi-
I uploaded the same code as I'd been using to two ESP-WROOM-32E modules (Arduino version 2.3.3)
(at the bottom of this post)

I can still get the code to upload on each module, and can erase the flash with pytool. I have switches on GPIO and EN.

Code: Select all

esptool.py --chip esp32 --port /dev/tty.usbserial-D30GPHQW --baud 460800 erase_flash

However, the code will not run and the serial monitor gives this

Code: Select all

12:04:40.189 -> rst:0x8 (TG1WDT_SYS_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
12:04:40.189 -> configsip: 0, SPIWP:0xee
12:04:40.189 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
12:04:40.221 -> mode:DIO, clock div:1
12:04:40.221 -> load:0x3fff0030,len:4916
12:04:40.221 -> load:0x40078000,len:16436
12:04:40.221 -> load:0x40080400,len:4
12:04:40.221 -> ho 8 tail 4 room 4
12:04:40.221 -> load:0x40080404,len:3524
12:04:40.221 -> entry 0x400805b8
12:04:41.078 -> ets Jul 29 2019 12:21:46

Are my modules bricked? What would cause this? Thanks! ~Sophi

Code: Select all

#include <Wire.h>
#include "LCD-SOLDERED.h"
#include <driver/adc.h> // Include this library to use ADC functions directly

LCD lcd(16,2); // Define LCD object with the correct number of columns and rows
const int batteryPin = 35;            // GPIO35 to read battery voltage
const float referenceVoltage = 3.3;   // ESP32 ADC reference voltage
const int resolution = 4095;          // 12-bit resolution (0 to 4095 for ESP32)
const float dividerFactor = 2.15;     // Divider factor for the 470k/470k setup
const int ledPin = 10;                // Hello World LED

void setup()
{
    Wire.setClock(100000); // in Hertz
    Wire.begin(21, 22);  //SDA, SCL
    lcd.begin();     // Initialize LCD
    lcd.backlight(); // Turn the backlight on
    lcd.clear();
// Set up serial communication for debugging
    Serial.begin(115200); 
    pinMode(ledPin, OUTPUT);     // Set GPIO10 as an output for the LED 
// Configure the ADC
  analogReadResolution(12); // Set ADC resolution to 12 bits (0-4095)
  analogSetPinAttenuation(batteryPin, ADC_11db); // Set attenuation for full-scale voltage of ~3.6V
 lcd.print(" Hello QSP32!"); // Prints Hello on the LCD
 // lcd.setCursor(5, 1);     // set cursor to 5th character in line 1
 // delay(5000);
}

void loop()
{   
// Read the analog value from GPIO35
 int adcValue = analogRead(batteryPin);
   if (adcValue < 2500){
    Serial.println("Charging");
   }
  // Calculate the battery voltage based on the ADC reading
  float batteryVoltage = (adcValue * referenceVoltage) / resolution * dividerFactor;

  // Display the battery voltage on the serial monitor (for debugging)
  Serial.print("adcValue: ");
  Serial.print(adcValue);
  Serial.println();
  Serial.print("Battery Voltage: ");
  Serial.println(batteryVoltage, 2); // Print voltage with 2 decimal places


  // Display the battery voltage on the LCD
  /*lcd.clear();             // Clear the previous display on the LCD
  lcd.setCursor(0, 0);     // Set cursor to the first column of the first row
  lcd.print("Battery Voltage:");
  lcd.setCursor(0, 1);     // Set cursor to the first column of the second row
  lcd.print(batteryVoltage, 2); // Display voltage with 2 decimal places
  lcd.print(" V");*/

// Blink the LED on GPIO10
  digitalWrite(ledPin, HIGH);  // Turn the LED on
  delay(250);                  // Wait for 250 ms
  digitalWrite(ledPin, LOW);   // Turn the LED off
  delay(250);                  // Wait for 250 ms */

  // Delay before reading again
  //delay(500);
}

[lbernstone]

This is very likely to do with your LCD object initialization. Your device is certainly not bricked, since it is responsive and allows you to delete the firmware.
Pin 10 is used by the SPI flash on most esp32 modules. You should not use that for your LED.
You should move the Serial.begin to the top of your code and turn core debug level to verbose to see if there are any runtime errors, but I'm guessing it is in your LCD code.

[Sophi9999]

Thanks, the issue was using GPIO10 as an output. Appreciate the response!