After playing with
CC11XX based modules for a while, I noticed that the HC-11 was relatively cheap (~ 5-6 USD/each incl. shipping),
came in a neat form-factor and had a co-microprocessor on board. It is intended to use as a wireless serial connection,
but I figured it could be re-flashed, since the microprocessor on board is the common
Using continuity mode on a multimeter and the datasheet, is was clear that the two unmarked pads on the back of the module,
exposed the programming pins
RST. I used a cheap
STLINKv2 clone from eBay or DX to do the programming.
stm8flash to flash it. You might need to remove the read/write-protection.
You can do that with the Windows-based programmer. I secured a USB-packet dump for it, so I might just make a small
python-libusb script that replays that bit.
Let me know if you need that.