wrong uart flash answer from ESP32

julian_p
Posts: 1
Joined: Fri Dec 29, 2017 5:29 pm

wrong uart flash answer from ESP32

Postby julian_p » Fri Dec 29, 2017 7:56 pm

Hallo the ESP32 is the first microcontroller I've disigned a board, but the flash dosen't work.
I use the Arduino IDE and it works with the devboard.

For my board I've used the same circuit for the flash like the devboard (same pins, same transistor type for T1 and T2, same usb to uart bridge https://www.amazon.de/gp/product/B071XV ... UTF8&psc=1 ).

Devboard circuit:
https://www.google.de/url?sa=t&rct=j&q= ... kPpyxAffmS


Because that the flash don't work I analysed the communication data stream. For this I connected the EN, IO0 and RXD0 parallel from the ESP32 by the devboard to the ESP32 on my board and I have seen that the answer on TXD0 isn't right.
Vgl_whole_communication.jpg
whole communication
Vgl_whole_communication.jpg (206.31 KiB) Viewed 3752 times
At first the bits are exactly the same but when the devboard ESP finishes its package the ESP on my board sends furthermore.
Vgl_2.jpg
vgl_2
Vgl_2.jpg (306.11 KiB) Viewed 3752 times
For me it's clearly that I have a hardware problem but I don't know where. Have I forgotten to connect a pin or have I connected a pin which is not allowed?

(only the ESP)
ESP32.jpg
ESP32.jpg (105.14 KiB) Viewed 3752 times
(pin 32 is not connected)


Thank you very much!

-Rudy-
Posts: 31
Joined: Sun Feb 05, 2017 1:08 am

Re: wrong uart flash answer from ESP32

Postby -Rudy- » Sun Dec 31, 2017 7:23 pm

It probably will not help, but try connecting pin 32.

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