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PCI express and NIOS

Altera_Forum
Honored Contributor II
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I had a NIOS system working with my custom peripheral this morning on the transceiver starter kit this morning.  

 

I then added a PCI express interface and had to modify the design a bit so I could fit it.  

 

I then recompiled the NIOS and got....  

 

undefined reference to `alt_ic_isr_register' 

 

I see that# define ALT_ENHANCED_INTERRUPT_API_PRESENT is missing from the system.h file for some reason.  

 

 

Any ideas?
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Altera_Forum
Honored Contributor II
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Discovered problem.  

 

It was my fault not really intuitive though. 

 

When I removed the JTAG UART from Qsys and regenerated .sopcinfo 

 

I got the error from eclipse 

 

undefined reference to `alt_ic_isr_register'  

 

Of course the JTAG UART qsys inclusion was generating  

 

# define ALT_ENHANCED_INTERRUPT_API_PRESENT 

 

In the system.h file.  

 

My custom peripheral has no HAL driver and therefore no# _sw.tcl file to indicate enhanced interrupt API and therefore I needed to use legacy interrupts.  

 

What I did was use conditional compilation i.e. 

 

# ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT 

static void codec_isr (void *context) 

# else 

static void codec_isr(void *context, alt_u32 id) 

# endif 

 

 

 

And 

 

 

# ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT 

a = alt_ic_isr_register (CODEC_BURST_MASTER_0_IRQ_INTERRUPT_CONTROLLER_ID ,CODEC_BURST_MASTER_0_IRQ, codec_isr, NULL, 0x0); 

# else 

a = alt_irq_register (CODEC_BURST_MASTER_0_IRQ_INTERRUPT_CONTROLLER_ID ,NULL, codec_isr); 

# endif 

 

 

And of course, using the legacy interrupts, the code now builds.  

 

Let’s see if that will work.
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