Code for handling a simple ISR

[Altera_Forum]

I made my file system, kernel, app and uploaded, this is the source: 

# include "D:\Proyectos\Marzo\NIOS2ndTry\Krl\build\include\nios2_system.h"# include <stdio.h>  typedef unsigned char INT8U;# define NIOSTmr (np_timer *)na_high_res_timer # define pio ((np_pio *)na_led_pio)# define PIO pio->np_piodata void TmrISR(void);   int main(void) {  (*NIOSTmr).np_timerperiodl = 0xB400;   (*NIOSTmr).np_timerperiodh = 0x04C4;  (*NIOSTmr).np_timercontrol = np_timercontrol_cont_mask |  np_timercontrol_start_mask |  np_timercontrol_ito_mask ;  nr_installuserisr(na_high_res_timer_irq, &TmrISR, 0);  while(1) {  }  return 0; }  void TmrISR(void) {  static INT8U Ctr;      (*NIOSTmr).np_timerstatus &= ~np_timerstatus_to_mask;  PIO = Ctr++;  printf("%d seconds\n", Ctr); }   but when i make my application, and try to run it, the system resets itself.  Any suggestions, corrections of the malfunctioning?

[Altera_Forum]

You can not use altera hal for interrupt service in uClinux. Read ch10 Interrupt Handling on the book "Linux device drivers 3rd ed.".

[Altera_Forum]

you are tryin to implement ISRs in a user-land application, and as far as I know, I don&#39;t think you can do this. All interrupts must be built into the kernel as a driver, correct? you need to write an actual driver, not a user application.