Nios® V/II Embedded Design Suite (EDS)
Support for Embedded Development Tools, Processors (SoCs and Nios® V/II processor), Embedded Development Suites (EDSs), Boot and Configuration, Operating Systems, C and C++
Announcements
FPGA community forums and blogs on community.intel.com are migrating to the new Altera Community and are read-only. For urgent support needs during this transition, please visit the FPGA Design Resources page or contact an Altera Authorized Distributor.
12748 Discussions

a weird issue with wrctl instruction

Altera_Forum
Honored Contributor II
‎01-17-2006 03:59 PM
1,021 Views

Hi all, 

 

I encountered a weird issue that I enabled one PIO interrupt by using: 

 

alt_irq_register(STROBE_PIO_IRQ, edge_capture_ptr, command_receive_interrupt); 

 

STROBE_PIO_IRQ equals to 3 

 

after calling alt_irq_register, the ienable register doesn't change its value to enable STROBE_PIO_IRQ. 

 

So, I tried to find what was the problem, then I step into alt_irq_register routine, and found the problem, see the following assembly code: 

 

wrctl ienable, r2 

 

before excuting this instruction, I can see that the value stored in r2 register is 0x1f and ienable = 0x17, but after excuting this instruction the ienable remained the original value of 0x17. 

 

It's a very weird problem, anyone help? 

 

best regards, 

David
0 Kudos

Link Copied

0 Replies
Reply

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.