@TheMogMiner did you fancy lending a hand with these on SPG2xx type hardware? https://github.com/mamedev/mame/pull/6814 … Pretty sure Ford Racing doesn't like the ADC implementation in the SoC emulation at least. Also need help with "smartvad amuseprk" fails to enable main irq, force and it plays
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Alright, thank you for looking at it, hopefully it'll actually start reading the ports in game too now and we can get it all working.
No sweat. Currently all I've managed to do is break jak_sith, but just as a heads-up, it's probably going to need some tweaking in the jakks_gkr analog hookups. jak_sith apparently uses channels 2 and (presumably) 3, not 0 and 1.
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According to this one SPG270 doc, the way it works is that an ADC interrupt (bit 13) is immediately flagged when the ADC is enabled, as it's ready for conversion. From there, the program will service the interrupt, and write bit 12 to request conversion.
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Bit 12 auto-clears after 3 ADC clocks, then 16 ADC clocks later the value will be ready, at which point the conversion-ready IRQ is flagged again, and the data will be present in the ADC Data register. If you feel like pinging me on Discord, I can hook up up with the 270 doc.
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noted, I wonder if this might make it possible to hook up the 'wheel' on wheel of fortune too rather than relying simply on the button alternative, although it's been a long time since I looked at that one. not much hooks up to the ADC at present, so not too much to check.
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Could be. I've added a LOG_ADC bit, so it should make logging ADC accesses a lot more straightforward in the future. If we see jak_wof twiddling the ADC, we'll know that's how it's hooked up.
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