ESP32 Download Tool can't connect with standalone chip.

[Amickael]

Hello there,

I am looking for some help with ESP32 DOWNLOAD TOOL. I want to flash my esp-wroom-32 by being directly plugged on the RX0 and TX0 pins with a FTDI cable (without the regular usb cable).
The problem is, i end up having an error : "Chip sync error: Failed to connect to ESP32: Timed out waiting for packet header" followed by an other error : "ESP32 Chip sync error esp_sync_blocking."
I checked the baudrate of my COM PORT and it's 115200 b/s, 8 data bit, 1 stop bit
the baudrate of my downloader tool is 115200 b/s.

I saw multiple people doing this with this setup but i only found it for arduino.[/s][/s]

setup.png (224.11 KiB) Viewed 8284 times

so i don't really know why it is not working.

[ESP_Angus]

Hi Amickael,

The 3.3V regulator in an FTDI chip cannot supply enough current for an ESP32, it's probably browning out. You need a regulator with at least 300mA current capacity, better 500mA (you may not need this much for programming, but you will for initialising WiFi/BT).

These modules are designed to be soldered on a PCB with an adequate power supply and a bulk power capacitor. Consult the ESP-WROOM32 datasheet for full details.

Angus

[WiFive]

And you need to bootstrap it

[ESP_Angus]

And you need to bootstrap it

Oh yeah, good point. Take a look here, Amickael: https://github.com/espressif/esptool/wi ... -Selection