fix: keep ESP32-C3 from booting into download mode after flashing - #62
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Three causes of the "wait usb download" after a successful flash (#60): - The ROM's RTC_CNTL_OPTION1 force-download-boot bit survives a reset, so clear it before resetting (C3, S3), as esptool does. - Reset() ended the stub session with reboot=true, rebooting into the ROM bootloader and re-enumerating USB, so the DTR/RTS reset that followed hit a stale fd. Use reboot=false and let the hard reset restart the chip. - C3 USB-Serial/JTAG detection picked the UARTDEV_BUF_NO address from a revision decoded out of MAC eFuse bytes, so it usually read the wrong address and missed the interface. Match on USB VID/PID instead, as esptool does, with the ROM variable as fallback. Also report failed DTR/RTS writes instead of logging "Device reset." Signed-off-by: deadprogram <ron@hybridgroup.com>
This was referenced Aug 23, 2026
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Any comments/feedback before merge? |
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Merging since it is working well in my testing. |
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Three causes of the "wait usb download" after a successful flash (#60):
Also report failed DTR/RTS writes instead of logging "Device reset."