ESP32-S2 Keeps Rebooting: "rst:0x1 (POWERON), boot:0x9 (SPI_FAST_FLASH_BOOT)"

[Xingdaa]

Hi everyone,

I am working with a custom PCB that includes ESP32-S2FH2 (with a 40 MHz crystal and 2MB internal flash). After programming the chip, it repeatedly reboots and outputs the following in the serial monitor:

Code: Select all

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x1 (POWERON),boot:0x9 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe5110,len:0x186c
load:0x4004a000,len:0x4
load:0x4004a004,len:0xb08
load:0x4004e000,len:0x3228
entry 0x4004a1cc

After a few loops, I get:

Code: Select all

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x3 (RTC_SW_SYS_RST),boot:0x9 (SPI_FAST_FLASH_BOOT)
Saved PC:0x4004f819
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe5110,len:0x186c
load:0x4004a000,len:0x4
load:0x4004a004,len:0xb08
load:0x4004e000,len:0x3228
entry 0x4004a1cc

Flashing Settings:
Board: ESP32S2 Dev Module
Program: Hello World
Flash Mode: QIO
Flash Frequency: 80 MHz
CPU Frequency: 240 MHz
Flash Size: 2MB
Partition Scheme: Minimal(1.3MB APP/700KB SPIFFS)
Upload Mode: UART
Upload Speed: 115200

What would be the causes of this error?
Any help or suggestions would be greatly appreciated. Thank you!