What is the difference between FIQ and IRQ interrupt system?
Jun 10, 2009 · I want to know the difference between FIQ and IRQ interrupt system in any microprocessor, e.g: ARM926EJ.
Understanding kernel message 'nobody cared (try booting with …
Dec 13, 2012 · 21 I'm trying to understand the meaning of the following message: irq N:nobody cared (try booting with the "irqpoll" option) Does this mean the IRQ handler not processing the …
What are linux irq domains, why are they needed?
Dec 19, 2015 · handle_nested_irq(irq_find_mapping(chip->gpio_chip.irqdomain, level)); irq_find_mapping() will find linux IRQ number by hardware IRQ number (using IRQ domain …
spin_lock_irqsave vs spin_lock_irq - Stack Overflow
Nov 26, 2015 · spin_lock_irqsave is basically used to save the interrupt state before taking the spin lock, this is because spin lock disables the interrupt, when the lock is taken in interrupt …
How to determine the IRQ number for a USB device?
May 18, 2013 · However, I am wondering how I would find what IRQ line (IRQ number) the device is interrupting on? That is, how do I determine what the value of the argument unsigned int irq …
linux kernel - Wait for interrupt for specific level - Stack Overflow
Jun 14, 2024 · Kernel routines such as request_irq () and free_irq () are intended for device driver initialization and then termination. These routines have high system overhead because they …
linux device driver - request_irq fails because there is no irq ...
Nov 15, 2019 · The irq_create_fwspec_mapping will either return an existing (mapped) virtual IRQ number, or map a new one. The struct irq_fwspec contains all the information that would be …
c - request_irq returns -22 (-EINVAL) - Stack Overflow
May 31, 2016 · Is it because of the irq number? Because after set the irq num to 10, I can register the irq successfully. The irq number 50 is not in /proc/interrupts, why can't I use it?
Interrupt-handling within kernel-module: request_irq() returns -22 ...
Aug 10, 2016 · request_irq(irqNumber, handler, 0, "GPIO_Test", NULL); but It returns -22, Invalid parameters. I think it might be the handler-function because I'm not sure about it's signature - …
c - What are the various ways to disable and re-enable interrupts …
Mar 26, 2022 · For an example look at the semaphore implementation in mbed-os. The other members of the STM32 family (STM32F0xx, STM32G0xx and STM32L0xx) may turn …