support build-in USB-JTAG-Serial #54
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@igrr / @ameyinamdar Is this clear to merge now? |
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Thanks for the PR @liux-pro, and sorry to keep you waiting. I have rebased and force-pushed to the branch of this PR, getting rid of the merge commit and adding a small fix related to the previous PR. Have tested this on ESP32-C3 and ESP32-S3 and both work fine! |
This was referenced Jan 12, 2023
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esp32c3 esp32s3 have a built-in USB serial.
When connect them direct by usb, without external usb-serial-bridge(ch340 etc.), send correct sequence of handshake signals can put the chip into download mode.
The specific sequence can be found from esp32s3 datasheet
33.4.2 Runtime operation.