GPIO in the kernel: an introduction [LWN.net]

GPIO in the kernel: an introduction

Posted Dec 15, 2016 20:05 UTC (Thu) by BlueLightning (subscriber, #38978)
In reply to: GPIO in the kernel: an introduction by bla
Parent article: GPIO in the kernel: an introduction

Surely the answer to switch bounce is to do the debouncing in hardware?

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GPIO in the kernel: an introduction

Posted Dec 15, 2016 20:32 UTC (Thu) by pizza (subscriber, #46) [Link] (1 responses)

But hardware debounce would require adding extra $0.02 worth of components and growing your board size by 2 square millimeters.

Why spent that money on every unit when it can be done once, "for free" in software?

GPIO in the kernel: an introduction

Posted Dec 17, 2016 6:44 UTC (Sat) by flussence (guest, #85566) [Link]

Fun trivia: this is exactly what the NES Classic does. In their GPL code dump there's a kernel driver for the controller - it has the same wire protocol the Wiimote uses (internally!), but leaves the kernel to deal with all that hardware-related insanity and more.