Nice idea but big chip design strikes again: on the latest Raspberry Pi, GPIO pins are handled by the separate IO chip connected over PCI Express. So now all yo

Nice idea but big chip design strikes again: on the latest Raspberry Pi, GPIO pins are handled by the separate IO chip connected over PCI Express. So now all your GPIO stuff needs to traverse a shared serial bus (that is also doing bulk stuff like say raw camera images). And already on many bigger MCUs, GPIOs are just separate blocks on a shared internal bus like AHB/APB that connects together all the chip IP, causing unpredictable latencies.