Is there a built-in way to have hijack send pre-defined stuff out the serial port when buttons are pressed in Aux mode? If not, how can I integrate some code that does this so that it can intercept the button pushes and then output things to the serial port?
The best way to approach this is probably to write a userspace app to talk to /dev/ttyS2 (?) normally (for Linux), and bind into Hijack to get buttons and draw a display UI of some sort.
It has been a very long while since anyone did that here, and even longer since I implemented the means to do so. As a result you'll have to do some digging on your own, unless other people have better memories than mine (quite possible).
Start here:
http://empegbbs.com/ubbthreads.php/topics/44955/1Then dig around. There are example apps using this interface, which could be useful.
Cheers
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