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Altera_Forum
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8 years ago

Pio write data error

Hi all, I am using IOWR_ALTERA_AVALON_PIOS macros to write data onto pios. But when I am writing the data onto 1 pins, all the other pins are assigned the same value at the same time. Does any...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
8 years ago

Hi,

Maybe how data has interpreted is a problem.

LSB bits are considered during reading & writing.

  1. What is the PIO width set?

  2. Can you share your code?

Or

Try with below code.

Example1: For single bit controle consider below code and try 


IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, count & 0x01);
while(delay < 2000000)
{
delay++;
}
count++;

Example2: 2-PIO of 3bits of width, for switches and leads. 


  int in;
  while (1) 
  {
	  in = IORD_ALTERA_AVALON_PIO_DATA(SW_PIO_BASE) & 0x07;//we are consedering/requried least 3bits from switch
              if(in==0)//if all swith are zero
	           IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, 0);
              else if(in==1)
                   IOWR_ALTERA_AVALON_PIO_DATA(LED_PIO_BASE, 1);
               ............
  }

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Best Regards,

Anand Raj Shankar

(This message was posted on behalf of Intel Corporation)