twischer 83f5f29cfd

Support to reboot into UART download mode (#7854) ...

without any external wiring.

This patch introduces the new method
Esp.rebootIntoUartDownloadMode()

When the user calls this method the ESP8266 reboots into the UART
download mode. In this mode the user can use esptool.py to flash a new
firmware file. The following command was used to test it:
$ esptool.py --before no_reset --after soft_reset --chip esp8266 \
    --port /dev/ttyUSB0 --baud 460800 write_flash 0x0 firmware.bin

The implementation is based on the original implementation in the
boot ROM. Some parts of the original implementation can be found in
[1]. This patch is a squashed and simplified version of [2]. The non
squashed version might be helpful in case of debugging issues.

[1] https://github.com/twischer/xtensa-subjects/blob/master/reversed/bootrom.c
[2] https://github.com/twischer/Arduino/tree/reboot_uart_download_full

Signed-off-by: Timo Wischer <twischer@freenet.de>

2021-02-17 08:25:52 -08:00

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