I have done some Sigrok (PulseView) capture of the signals (tested with Windows7) Thanks hydrabus. That's interesting, your IO0 delay is closer to 2ms than the 4ms I was seeing. But same pattern. self._port.setDTR(False) # GPIO0 -> 1 self._port.setRTS(True ) # RST -> 0 self._port.setDTR(True ) # GP...

analoglamb wrote: You mean that we need to press BOOT button when download firmware with V2 Board. Is it right?

Yes: If using esptool.py on Windows and the automatic reset doesn't work.

Just an update I have found a workaround to the random connection problem if I keep "Boot" button pressed esptool.py always works (even on Win7) Thanks for reporting this, hydrabus. I have reproduced this issue on Windows 7 with a v2 core board. On Windows there is a 4ms delay between when "EN" goe...

Electrical schematic PDFs for development boards & modules designed by Espressif: Note: This list is no longer updated. Latest reference designs can be downloaded from http://espressif.com/en/support/download/documents Previously Published Development Boards Core Board V2 (aka DevKitC) ESP-WROVER-KI...

Hi folks, Thanks for updating me with the unchanged output. Can you please grab the newest update on the same branch: EDIT: This branch is now merged into esp-idf via branch feature/esp32_esp32_v20_refactor, if you have the latest esp-idf then you will have it. And try running these two commands: es...

The V1 (blue PCB) DevKitC boards have a bug with the auto-reset circuit where it doesn't work reliably. You need to hold down the "Boot" button (J3, pulls down IO0) in order to reliably enter the bootloader. V2 (black PCB, "ESP32_Core_Board_V2" marked on bottom) DevKitC does not have this problem.

What hardware did you take this capture from? If it's the board in your first post, can you please post the schematic?

ESP32 libc (newlib) is compiled with "nano" I/O options, which disables 64-bit formatting. Solution is something like:

printf("Here is a big int %" PRId32 "%" PRId32 "\n", (int)(bigi >> 32), (int)bigi);

Unfortunately I don't know of a way to do this to third-party code without editing it.

Try setting the baud rate to a lower value (either by changing the "--baud" argument on the command line, or the setting in "make menuconfig").

Rather than answer the above questions, can you please try esptool.py from this link and report back if flashing succeeds? Thanks. https://github.com/themadinventor/esptool/tree/bugfix/write_fails_cmp_bit_set (There are several ways to do this: You can either download esptool.py and run it in place,...