desertfish wrote: ↑Wed Jun 21, 2023 11:02 pm
Are you by any change manipulating Vera registers inside the IRQ handler?
That is super tricky. There are some helper functions in prog8 that can save/restore the vera state in this case. Also make sure the rom and ram banks are set back to their initial values if you manipulate those in the irq handler .
(unless you depend on them changing)
I haven't changed anything in the 'interrupt' block, I simply copied (cut and pasted) from the line cx16.rombank(0) to the line cx16.VERA_AUDIO_RATE = 0, to it's own sub. Made local variables for size and block size, or even referenced the originals from start(), makes no difference.
If I just repeat this code in start(), only changing the MUSIC_FILENAME and restoring the irq vectors in between playing the two files, it works. If I create a subroutine, call it once, it works, but on the second call it fails. If I play the first .wav file using the original code (no sub) it works, but if I try to use a sub for the second .wav file, it fails. So, there is something that is different after the 1st .wav file is played, that is making the 2nd attempt, using a sub routine, to fail.
In the version where I can play two files consecutively, I have had 2 calls to cx16.rombank(0), 1 call (first file) and none. They all work. Whether or not this would be problematic in the 'real world', I don't know, I have only ever changed rom banks in assembly programs....Prog8 handles this and I'm happy to let it!
I did a bit of nosing around in the debugger, not something I do often, less from the official emulator version....preferring Box16, but it's still on R41 and I'm not interested in learning how to build it for myself. What I looked at looked okay, but, that's the deep end of the pool for me!
Works great with some files that I just happened to have laying around! After futzing about for a while, I finally managed to get it to stream two files consecutively, but only if I did practically nothing in between each file. I'm missing something. 
I suspect it has to do with the interrupt handler...not something I'm very experienced with, but perhaps that's not it. I tried saving the old vector and restoring it in between files, but either I'm doing it wrong, or that's not it! 
It seems like this should be doable. I'd like to incorporate this into my current project, to play some wave files when not much else is going on. Any insight you can give me would be great!
