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RTC example ROM non-functional (vs EZO & VBA-m) #1400

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felixjones opened this issue May 2, 2019 · 1 comment
Closed

RTC example ROM non-functional (vs EZO & VBA-m) #1400

felixjones opened this issue May 2, 2019 · 1 comment

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@felixjones
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Attached is an old RTC test of mine written for the EZ Flash Omega cartridge, the C code behind the RTC operation of this ROM is based on the work of the PRET Emerald project (which is guaranteed to produce a working RTC ROM for their toolset).

rtc_test.zip

This test works on Omega, at the time that was good enough for my needs, however I have never been able to get this working on mGBA. Out of curiosity, I tried this on VBA-m and was surprised to find it worked, so I am left a little puzzled as to where the issue lies.

I have tried writing and re-writing my RTC code a few times over the past week and have been unable to get any kind of response working on mGBA. The correct overrides for RTC have been applied, I have also tried using game IDs from known RTC games to use the automatic HW detection of mGBA and still no luck.
@endrift
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endrift commented May 2, 2019 •
edited

Can I see your source? I've modified how the RTC works significantly and it seems to be outputting correctly now but I'm still getting errors from your program.

Turns out there was a bug where ROMs that weren't power-of-two sized would break with the RTC, even if the RTC was updating properly.

endrift added a commit that referenced this issue May 2, 2019
@endrift
GBA: Fix RTC on non-standard sized ROMs (fixes #1400)
b6e791b
@endrift endrift closed this as completed in ba6c006 May 2, 2019
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@endrift @felixjones