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trouble using IOWR_32DIRECT and IOWR_8DIRECT in same code?

Altera_Forum
Honored Contributor II
‎02-04-2015 09:44 PM
2,536 Views

Guys 

 

Im very new to nios and altera. 

 

Im working on my first application using spi. that part works fine 

 

What im having issues with is once i use IOWR_32DIRECT, later calls to IOWR_8DIRECT in same code seem to cause code to freeze. 

 

I read in system console help that i need to respect memory boundaries, and i think im doing that.  

 

If i write to IOWR_32DIRECT(0x00040010....), that works... 4 bytes 

then if i write to IOWR_8DIRECT(0x00040014), i get errors. i would imagine that as long as i preserve the 4 byte boundaries, that id be able to write 8 bit words.... no? 

 

Is there something that im doing wrong? Or is it once IOWR_32 is used, i can only IOWR/IOR_32... cant IOWR/IORD_8/16 anymore?? 

 

sorry if this is a "dumb" question. gotta learn somehow 

 

thanks!!
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