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When running a terminal program, the following is displayed when the bootloader is entered:
Radio Bridge Bootloader v1.0.0
1. Upload Image
2. Run Application
3. Menu
Sending ASCII '1' starts a 60 second timer and provides a window for the new image to be
transferred via XMODEM protocol. The XMODEM protocol is a standard file transfer protocol
and is described in other references. If the firmware image transfers properly the menu will
re-appear and sending ASCII '2' will re-enter the main application.
The time that the bootloader waits for the <DEL> input key is configurable through the BT
(Bootloader Timeout) AT command. The maximum wait time is 3 seconds (default) but the
delay can be reduced to reduce the amount of time it takes to enter the main application. If
the bootloader timeout is set to zero, the bootloader is skipped completely at reset and the
main application is entered directly.
As a failsafe measure, there are two pads on the top side of the module with the label
"Bootloader". If these pads are shorted together during reset, the bootloader will enter
automatically.
The firmware images provided by Radio Bridge are signed and encrypted meaning that they
cannot be loaded on other hardware, and no other firmware images can be loaded on the
module through the bootloader.
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© 2017, R
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ADIO
Note that the bootloader is a program separate from the normal operation
of the device and thus no AT commands or other features will work while in
this mode.
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