4 ms·
Another layer of serial interfaces would make it even slower.
by thesmok 9y ago
Another layer of serial interfaces would make it even slower.
- mark-r 9y agoDepends on the speed/latency of the interface. Although you could probably say the same about the scanning matrix too.
- brokenmachine 9y agoA serial interface can run a lot faster than anyone can type, eg i2c high speed is max 3.2Mbit/s. SPI can be way faster than that I believe.
- thesmok 9y agotrue, but adding another link (microcontroller) in the chain is going to add delay anyway. I think the original suggestion was pointless: instead of adding more microcontrollers you can just replace the main uC with the one that has enough pins. The reason this is not done is uCs with >100 pins are usually more powerful and expensive, so you can't just pay for more pins -- you also have to pay for more processing power and features you don't need.