4 ms·
No, the controller used to be part of the motherboard chipset in a way that allowed DMA access to GPIO registers (so the CPU didn’t need to actively bit bang th
by throwup238 2y ago
No, the controller used to be part of the motherboard chipset in a way that allowed DMA access to GPIO registers (so the CPU didn’t need to actively bit bang the port, drivers could just fill a buffer and offload it to the hardware) and interrupts that had priority over all other processes.
USB simply doesn’t work like that.