ESP32 WROVER stuck in boot loop

polishfuze
Posts: 1
Joined: Mon Mar 09, 2020 6:03 pm

ESP32 WROVER stuck in boot loop

Postby polishfuze » Mon Mar 09, 2020 7:33 pm

I got a new ESP32 WROVER from LCSC for my DIY breakout board, I was able to upload my sketch (hello world) but the ESP32 is now stuck in a boot loop (I am able to flash new sketches, they just don't work and I get the same results) , and it displays this message via the serial interface every 300ms

ets Jun 8 2016 00:22:57

rst:0x10 (RTCWDT_RTC_RESET),boot:0x37 (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:2
load:0x3fff0018,len:4
load:0x00000003,len:53674752


I created my board according to the devkit schematic. (with out the UART to USB converter as this is handled by a separate board)

ESP_Sprite
Posts: 9769
Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32 WROVER stuck in boot loop

Postby ESP_Sprite » Mon Mar 09, 2020 8:52 pm

What does your power supply look like? You need to be able to supply at least 500mA on the 3.3V line, otherwise you can get weirdness because of brown-outs.

Aussie Susan
Posts: 45
Joined: Thu Aug 22, 2019 3:48 am

Re: ESP32 WROVER stuck in boot loop

Postby Aussie Susan » Tue Mar 10, 2020 1:48 am

How are you flashing the device?
I was getting this using the QIO method and it was solved by changing to DIO. (This is mentioned at the bottom on one of the documents I found on the web)
Susan

xenpac
Posts: 25
Joined: Sun Dec 08, 2019 1:20 am

Re: ESP32 WROVER stuck in boot loop

Postby xenpac » Fri Mar 27, 2020 6:03 pm

any input signals on IO14 (MTMS) ?

Some pins have special functions.

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