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Altera_Forum
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19 years ago

Simple device driver using an interrupt

I want to write a simple device driver which uses interrupts. My Nios2 system has the following componentes: cpu, sdram controller, cfi flash controller, jtag uart and a timer. I have added...
Altera_Forum's avatar
Altera_Forum
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19 years ago

--- Quote Start ---

originally posted by takulu@Jun 28 2006, 03:29 AM

here are the kernel initialization messages for the module: 

....
io scheduler noop registered
io scheduler deadline registered (default)
serial: jtag uart driver $revision: 1.4 $
ttyj0 at mmio 0x82001000 (irq = 1) is a jtag_uart
my_irq: module initialization started
my_irq: requesting interrupt
my_irq: irq request successful!
my_irq: module initialization ended
marvell 88e1101: registered new driver
....
sash command shell (version 1.1.1)
/> cat /proc/interrupts
   :          0   spurious
  0:       2405 l timer
  1:         63   jtag_uart
  2:          0   my_irq
/>

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As you can see when you cat /proc/interrupts the linux code is perfectly well but you&#39;re not getting interrupts from your hardwre component. Maybe you need to enable interrupts on the device you want to get the interrupts from?

You should first check (with signal tap for example) wether the interrupts is actually generated.