register to enable/disable $f723 buttons discovered
I modified the keycheck routine for my BallBounce program for the pv2 to take advantage of benefits offered by register $f723. It worked great on the pv2, but when I tried it on the FlatFoto 3, the buttons did not respond at all. Evidently the pv2 initializes $f720 to a value that allows the $f723 register buttons to be read. The FF3 is bootloadered so I can run programs on it and it must not initialize $f720. After looking around and trying several registers, I found that setting each bit of $f720 enables each of the corresponding latched buttons of $f723. You can set $f720 to $ff to enable all buttons or set it to the specific value to enable only the buttons you will be reading.
I modified the keycheck routine for my BallBounce program for the pv2 to take advantage of benefits offered by register $f723. It worked great on the pv2, but when I tried it on the FlatFoto 3, the buttons did not respond at all. Evidently the pv2 initializes $f720 to a value that allows the $f723 register buttons to be read. The FF3 is bootloadered so I can run programs on it and it must not initialize $f720. After looking around and trying several registers, I found that setting each bit of $f720 enables each of the corresponding latched buttons of $f723. You can set $f720 to $ff to enable all buttons or set it to the specific value to enable only the buttons you will be reading.