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What about a Raspberry Pi as a modern modchip?
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<blockquote data-quote="ghjfdtg" data-source="post: 8467607" data-attributes="member: 351436"><p>[USER=464629]@Archerite[/USER] </p><p>You can't drive the GPIO pins of the Raspberry Pi fast enough for parallel. It doesn't have hardware support for parallel as far as i know. So SPI is the only option (with the Raspberry Pi alone).</p><p></p><p>So that's how it works. A Raspberry Pi may be able to do it but not sure how important timing is here. Bitbanging is relatively slow due to high latency between toggling pins which apparently has something to do with register writes going through the Video Core IV GPU first which is the slow path. I don't know the datails. The atmega microcontroller probably has lower latency toggling pins.</p><p></p><p>Problem is if you want to use multiple of them at once. If you use just Bluetooth for example it will be fine. The RAM is pretty much useless other than using it as extra storage. That's a bit of a waste unfortunately because it could be super fast but is bottlenecked by the slow connection between both devices. Maybe you should take a look into FPGAs to drive that parallel interface aswell.</p><p></p><p>Good luck with this project. I will have an eye on it.</p></blockquote><p></p>
[QUOTE="ghjfdtg, post: 8467607, member: 351436"] [USER=464629]@Archerite[/USER] You can't drive the GPIO pins of the Raspberry Pi fast enough for parallel. It doesn't have hardware support for parallel as far as i know. So SPI is the only option (with the Raspberry Pi alone). So that's how it works. A Raspberry Pi may be able to do it but not sure how important timing is here. Bitbanging is relatively slow due to high latency between toggling pins which apparently has something to do with register writes going through the Video Core IV GPU first which is the slow path. I don't know the datails. The atmega microcontroller probably has lower latency toggling pins. Problem is if you want to use multiple of them at once. If you use just Bluetooth for example it will be fine. The RAM is pretty much useless other than using it as extra storage. That's a bit of a waste unfortunately because it could be super fast but is bottlenecked by the slow connection between both devices. Maybe you should take a look into FPGAs to drive that parallel interface aswell. Good luck with this project. I will have an eye on it. [/QUOTE]
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