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Altera_Forum
Honored Contributor I
2,531 Views

How to get rid of warning: implicit declaration of function 'alt_irq_register'?

Hi all, 

 

I'm working with a nios application and it works but I can't find a way to get rid of this warning. I try to follow the# include files but I keep getting lost. I have a fixed timer (100ms) set up in qsys... called TIMER_0. I've included the following files in main.c: 

 

# include "alt_types.h"# include "io.h"# include "system.h"# include "altera_avalon_timer_regs.h" //for timer# include "sys/alt_irq.h" //for irq ? 

 

The line giving me the error is: 

 

alt_irq_register(TIMER_0_IRQ, 0, timer_isr); 

 

 

Thanks
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5 Replies
Altera_Forum
Honored Contributor I
419 Views

Look at the BSP documentation that was generated when you built your BSP. Check there for alt_irq_register. Assuming you didn't mispell it, that documentation should list what include file(s) you need to include.

Altera_Forum
Honored Contributor I
419 Views

Could you be more specific when you say to look at the documentation that was generated with the BSP please? I see a "summary.html" file but I'm not sure what I'm looking for. 

 

Thanks
Altera_Forum
Honored Contributor I
419 Views

Please have a look at the systems.h inside your BSP and check whether you have a define for "ALT_ENHANCED_INTERRUPT_API_PRESENT". 

 

if it is defined, please have look at <alt_irq.h> and see: 

 

/* 

* alt_ic_isr_register() can be used to register an interrupt handler. If the 

* function is succesful, then the requested interrupt will be enabled upon  

* return. 

*/ 

extern int alt_ic_isr_register(alt_u32 ic_id, 

alt_u32 irq, 

alt_isr_func isr, 

void *isr_context, 

void *flags); 

 

 

if it is not defined, use: 

 

/* 

* alt_irq_register() can be used to register an interrupt handler. If the  

* function is succesful, then the requested interrupt will be enabled upon  

* return. 

*/ 

extern int alt_irq_register (alt_u32 id,  

void* context,  

alt_isr_func handler); 

 

which seems to be used by you, but the define seems to be there... 

 

I hope this helps as starting point. 

 

Kind regards
Altera_Forum
Honored Contributor I
419 Views

ALT_ENHANCED_INTERRUPT_API_PRESENT was defined. I was reading the documentation and it said that alt_irq_register() was deprecated so I changed it to alt_ic_isr_register() a few days ago. I didn't know what to use for "void *isr_context" and "void *flags" so I made them zero. I defined the isr as: void timer_isr(). All warnings went away. Thanks.

Altera_Forum
Honored Contributor I
419 Views

Sorry, my mistake. I was thinking of the SoC chip BSP. The NIOS environment doesn't automatically generate BSP documentation.  

 

For the NIOS, the BSP documentation is in https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/nios2/n2sw_nii5v2.pdf. This is the NIOS II Software development handbook.  

 

You might also want to look at https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/hb/nios2/n2sw_nii52017.pd... which is the documentation for the development environment.
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