ESP32 Forum

Hello ereryone:
I followed Get Started of official Docs https://esp-idf.readthedocs.io/en/lates ... index.html
and I met these problems:
1, my cygwin shows "serial.serialutil.SerialException: [Errno 2] could not open port COM3". But I successed Download with ESPFlashDownloadTool through COM3
2, my Hellow_world.bin file is only 119KB, and I get all this below information from Esp32 development board with Hellow_world.bin
"rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57"
I donot know what to do now ,I did every step in the Get Started...

Hi xsteamer,

Please provide some more details so that we can help you.

xsteamer wrote:Hello ereryone:
I followed Get Started of official Docs https://esp-idf.readthedocs.io/en/lates ... index.html
and I met these problems:
1, my cygwin shows "serial.serialutil.SerialException: [Errno 2] could not open port COM3". But I successed Download with ESPFlashDownloadTool through COM3

What command are you running? What is the full output of the program? How are you launching "cygwin", are you running the mingw32.exe described in the setup guide?

2, my Hellow_world.bin file is only 119KB, and I get all this below information from Esp32 development board with Hellow_world.bin
"rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
flash read err, 1000
ets_main.c 371
ets Jun 8 2016 00:22:57"
I donot know what to do now ,I did every step in the Get Started...

Usually this error means no bootloader has been flashed. To use the GUI flasher, please try following the guide WiFive posted which shows all of the files to flash via the GUI tool.