how to set i/O

Altera_Forum · ‎12-15-2005

i have set one i/o pin to bidirectional(tri-state) I/O port,and finished the hardware compile.

but in the nios II IDE ,how to set the bidirectional(tri-state) I/O port to out por

!

the following is my code (the name of pio is ADATA)

int main()

{//dir=0;

//IOWR_ALTERA_AVALON_PIO_DATA(LEVELCONTROL_BASE,1);

IOWR_ALTERA_AVALON_PIO_DIRECTION(ADATA_BASE,0XFFFF);

//alt_irq_register(TIMER_0_IRQ,0, handle_Timer0_interrupts);

//IOWR_ALTERA_AVALON_TIMER_PERIODL(TIMER_0_BASE, 0X1F40);

//IOWR_ALTERA_AVALON_TIMER_CONTROL(TIMER_0_BASE, 7);

IOWR_ALTERA_AVALON_PIO_DATA(ADATA_BASE, 0XFFFF);

while (1) {;}

}!

but when i test the value of the pio ,there is no value(even i set IOWR_ALTERA_AVALON_PIO_DATA(ADATA_BASE, 0)

why ??

thanks! http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif

Altera_Forum · ‎12-15-2005

Hi, I am having the same problem from time to time.

Usually it starts working after re-generation of the system in SOPC builder and Quartus, sometimes try changing the location of the pin in SOPC and moving it back again. Hope it will work, I would also like to know why this is happening.

Altera_Forum · ‎12-16-2005

but i cannot output the data by the bidir port!

how could it output the data?

Altera_Forum · ‎12-16-2005

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originally posted by wbqyy@Dec 15 2005, 09:43 PM

but i cannot output the data by the bidir port!

how could it output the data?

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I had the same problem - no data at the output, recompilation as I described in previous post helped it...