ESP32 Forum

I am facing startup problem with my custom board. If the supply voltage is more than 3.3V then the board ‎always boot in download mode and I get following lines in terminal:‎
rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))‎
waiting for download
If the supply voltage is 3.3v than the board will boot in normal mode and the message in terminal is:‎
rst:0x1 (POWERON_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:2‎
I am following ESP32_DevKitC_SCH_20180607A for my custom board.‎
I want the board to boot in normal mode till I keep pressing button which connects IO_0 to GND.‎
I am using ESP32EU module on my board

Can you share your schematic? Even if you say it's according to the DevkitC, we'd still like to check.

Thanks for your response. Bellow is my schematic. I am also attaching the DevKitC-Ver4 schematic I am following. I have searched the web and tried many solutions but of no use.

I am suspicious of C12, C13 , 100nF capacitors attached to EN and IO_0 pins

I think your issue is that the RC network on the EN line charges at a faster rate as the RC network formed by C12 and the internal pullup resistance. Suggest getting rid of C12; the equivalent capacitor C15 is marked as NC on the ESP32 devkit schematic indicating there's a footprint for it but by default it's not fitted. (So your suspicion was correct.)

Also ME6217's enable pin is floating.

Wow!!! Its working now . Thanks a lot 'ESP-Sprite", removing C12 (connected with IO_0) solved the problem.

Also "boarchuz" you correctly pointed out my first mistake in the schematic. For this board I have jumped CE with VIN. In next board I will correct this mistake.