Active3 years ago
I'm confused about the driver gpio_keys.This driver distinguishes between two types of buttons:
The problem is, when a buttons will be pushed while a file is already playing, the PI keeps the button push in a buffer and play the file after the current file in a loop. Imagine, somebody will push 5 times the same button, 5 times the same mp3 file will be played in a loop. GPIO Buttons Driver driver manufacturer is (Standard system devices) and developed by Microsoft in the database contains 4 versions of the GPIO Buttons Driver matches the hardware HID_DEVICE. Common Driver for Buttons, DockMode and Laptop/Slate Indicator - Windows 10 Service. GPIO Button Driver by Microsoft Corporation. This service also exists in Windows 8. The Common Driver for Buttons, DockMode and Laptop/Slate Indicator service is a kernel mode driver. If Common Driver for Buttons, DockMode and Laptop/Slate Indicator fails.
# Pins = led wiringPi pin 0 is GPIO 17, button wiringPi pin 8 is GPIO pin 0 # and that pin has a 1800 ohm pull-up resistor so will normally read high, # pushing the button will make it read low. Common Driver for Buttons, DockMode and Laptop/Slate Indicator - Windows 8 Service. GPIO Button Driver by Microsoft Corporation. This service also exists in Windows 10. Startup Type. Windows 8 edition Windows 8 Windows 8.1.
IRQ-only buttons and GPIO-driven buttons
Could anyone explain the difference between one and another?
AlexAlex
1 Answer
Disclaimer: I have not read the latest
gpio_keys
code, just skimmed over it. Yet, I believe that there is a good explanation for the separation of GPIO keys from IRQs.Windows Gpio Driver
A kernel has an IRQ event table, so different events can be given to known IRQs. The list of events (callbacks, well actually pointers) is written into a PIC (a separate chip or integrated in the CPU) and when the given interrupt happen the execution context enters into the event function. These functions need to be small so not much time is lost inside the interrupt.
Gpio Driver Download
But what is really important here is that (unless the CPU is instructed to temporarily ignore interrupts) the kernel will answer every interrupt.
For a responsive application you want things connected to the GPIO pins to produce an interrupt (i.e. be like an IRQ). Yet, there may be application where you do not care about every click of the button or every change in the state of whatever is connected to the GPIO pin. One example could be a sensor, which you want to measure every, say, half a second. You do not want the sensor to tell the kernel when it is 'pressed' you want a userspace application to poke the kernel to tell it the current state of the sensor every half a second. It is not hard to think of a sensor that exposes an interface that looks like a button, pretty much any sensor that has only two states (e.g. dark/light with a threshold) can look like a button.
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