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  VS Arduino › Visual Micro › Visual Studio 2017, 2019, 2022 › ESP-32: Use RTS and DTR for Reset and Boot on upload
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Normal Topic ESP-32: Use RTS and DTR for Reset and Boot on upload (Read 8933 times)
Arecon
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ESP-32: Use RTS and DTR for Reset and Boot on upload
Dec 22nd, 2019 at 5:46pm
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Hi

I'm using an FTDI-based USB to serial adapter to upload programs to an ESP-32. To make the upload process more convenient I would like to use the RTS and DTR pins of the converter chip to trigger Reset and Boot in my circuit.
How can I get VisualMicro to pull down DTR and RTS at the right moments to start the upload process?

Thanks
  
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Tim@Visual Micro
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #1 - Dec 22nd, 2019 at 7:45pm
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I thought that is what happens anyway? I think yiu upload is made via the python files in the toolchain you are using.
  
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Arecon
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #2 - Dec 22nd, 2019 at 9:25pm
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During an upload attempt DTR is pulled down twice but RTS/CTS stays high all the time.

I would like to use DTR for Boot and RTS for Reset since this also done by the original development tools as described on this page:
https://github.com/espressif/esptool/wiki/ESP32-Boot-Mode-Selection
  
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Tim@Visual Micro
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #3 - Dec 22nd, 2019 at 9:28pm
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Please follow the instructions in the yellow box above but also enabled the Verbose Upload option.

Then try upload and post the output as a .txt file or email with link to this post.

Thanks
  
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Arecon
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #4 - Dec 22nd, 2019 at 9:38pm
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Oh, I wasn't aware that the upload function also has a verbose mode.

Code
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Uploading 'ControllerEsp32' to 'ESP32 Dev Module' using 'COM3'
Uploader started for board ESP32 Dev Module
Upload method will be: bootloader
Uploading via Bootloader
sptool.exe --chip esp32 --port "COM3" --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size detect 0xe000 ols/partitions/boot_app0.bin" 0x1000 ols/sdk/bin/bootloader_qio_80m.bin" 0x10000 Esp32.ino.bin" 0x8000 Esp32.ino.partitions.bin"
esptool.py v2.6
Serial port COM3
___
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header
esptool.py v2.6
Serial port COM3
___
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

The uploader returned an error

  
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #5 - Dec 22nd, 2019 at 9:52pm
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Maybe I just found the problem.

According to the data sheet of the FTDI FT232RL RTS, CTS and DTR are 3 independent pins. My serial adapter only connects CTS and DTR and I thought all the time that RTS and CTS were two names for the same pin.

This explains what happens. Sorry for wasting your time.
  
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Re: ESP-32: Use RTS and DTR for Reset and Boot on upload
Reply #6 - Dec 22nd, 2019 at 10:01pm
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No problem, thanks for the update.
  
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