ESP32 Forum

Hi

I have a WROOM32 on a breadboard using a FTDI USB/UART for comms. In a terminal I can see that the ESP32 is going into flash download mode correctly. Following other forum post answers I have used an independant 3.3V supply for the ESP32 (Bench supply and breadboard plug in supply) - both show same result. When I try to run 'make flash' I get the following:

NariseS@Narise MSYS /E/Electronics/Eclipse/ProjectZippy
$ python /e/Electronics/Eclipse/esp-idf/components/esptool_py/esptool/esptool.py --chip esp32 --port COM9 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 40m --flash_size 4MB 0x1000 /E/Electronics/Eclipse/ProjectZippy/build/bootloader/bootloader.bin 0x10000 /E/Electronics/Eclipse/ProjectZippy/build/app-template.bin 0x8000 /E/Electronics/Eclipse/ProjectZippy/build/partitions_singleapp.bin
esptool.py v2.0-beta2
Connecting......
Uploading stub...
Running stub...
Stub running...
Attaching SPI flash...
Configuring flash size...
Flash params set to 0x0220
Compressed 13824 bytes to 7638...

A fatal error occurred: Timed out waiting for packet content


In the ESP download tool the console reports this:

pic path: ./RESOURCE/SYNC_S.bmp
***********************
chip sync ok!
ESP32 set baud: 115200
Changing baud rate to 115200
Changed.
mac l: 0xc404160cL
mac h: 0x9b240a
crc_cal: 155
crc_read: 155
crc_test: 0
ESP32 mac crc ok
48bit mac
MAC AP : 240AC404160D
MAC STA: 240AC404160C
get mac res: True
('tttest uuuuuuuuuuart : uart reg: ', 342)
(' baudrate: ', 115200)
get crystal: 39398400
SEND ESP SPI ATTACH CMD
get flash id error
com closed*********************
pic path: ./RESOURCE/ERROR_S.bmp
***********************

KEY PATH NONE...

Any help would be appreciated.

I have also checked the following:

Pin 14 left loating
Pin 24 tied to 0V
Pin 25 tied to 0V
Nothing connected between pins 17 and 22

I noticed before selecting the flash size manually that the flash script was also unable to automatically determine the flash size.

Regards
John

hi,
I meet the same cause,have you resolved it? could you tell me the solution of this cause?

thanks!

Using WROOM32 modules by themselves on breadboards is very tricky. Usually this kind of problem is some combination of:

Power Problems
- Need an adequate 3.3V power supply (suggest 500mA current rating or more). Power from a USB/serial adapter is never enough.
- Need adequate capacitance immediately next to the power pins of the module. Value of 200uF or higher is good. Low ESR is also very good. Putting a high capacitance electrolytic capacitor in parallel with a lower value but low ESR ceramic or other capacitor type can be helpful.

Serial Communications Problems
- Check the leads (including ground) to/from the USB/serial adapter.
- Lower the baud rate if necessary (in menuconfig under Serial Flasher Config, or in Arduino Tools menu, or esptool.py --baud parameter).

Buying a premade development board where the WROOM32 module has the relevant components on the board already is a good way to get up and running quickly, with less fiddliness.