Interfacing to a daughter card through PROTO"

I'm using an evaluation board based on cyclone EP1c20. Actually I' m using 16 pin on J16 (40 pinPROTO2 connector) for an OUTPUT PIO 16 bit wide.

From the reference manual seems that all the FPGA pins (except RESET_n) connected to j16 are general purpose, Isn't it? If yes let me go ahead.....

I wanted to debug the system, so I slightly modified the "hello led" example adding a stupid loop in this way:

".......

alt_u16 i;

i=0;

while(i<10){

IOWR_ALTERA_AVALON_PIO_DATA(OUT_PIO_BASE, 0);

IOWR_ALTERA_AVALON_PIO_DATA(OUT_PIO_BASE, 0xa);

IOWR_ALTERA_AVALON_PIO_DATA(OUT_PIO_BASE, 0xaa);

IOWR_ALTERA_AVALON_PIO_DATA(OUT_PIO_BASE, 0xaaa);

IOWR_ALTERA_AVALON_PIO_DATA(OUT_PIO_BASE, 0xaaaa);

i++;

}

.......", what i see is the right sequence on OUT_PIO[0..15] up to the prefinal assignment but, on the last I

see 0x8aaaa instead of 0xaaaa. It&#39;s not all.

If I do this serie of assignments out of the loop, everithing works fine. Actually It works fine even if I do the assigments in a reversed order

within the loop........ http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/blink.gif

Has someone an idea to suggest me??

Thanks