Nios V, FIFO 8 bit width, altera_avalon_fifo_read_level

[andy25]

I have a project built in 22.1 Standard, that has a fifo with an 8 bit width:

 

I can read from my Nios V using the altera_avalon_fifo_read_level function, 1 byte at a time.  Each time I call it the level drops by 1.  It works as expected.

After I rebuild the project in 23.1 Standard, the altera_avalon_fifo_read_level function now reads 4 items at a time and returns a 32 bit int.  The level drops by 4 each call.

There is a warning saying Nios II only supports 32-bit, and that you'll need to "access the registers directly".  I don't know what that means.

I tried:

int sample = IORD_8DIRECT(IPMB_FIFO_OUT_BASE, ALTERA_AVALON_FIFO_DATA_REG);

While it returns 1 byte it also drops the level by 4.

How do I make 23.1 work like 22.1?

-Andy

[wwanalim_intel]

Hi,

Greetings and welcome to Intel's forum.

Please give me some time to check on this issue and will get back to you with the update.

Thank you.

Regards,

Fathulnaim

[wwanalim_intel]

Hi,

Is the design inspired by any online references?

Could you share a screenshot of any warnings or errors that have popped up?

[andy25]

Online reference?  No, not really.

Warning/errors:  Sure.  For version 22.1 or 23.1?  I'll assume 23.1.  For platform designer, quartus or gcc?

I can also create an IPS ticket and share the entire project if that would be helpful.

I'm using the Intel Max10 Dev Kit 

23.1 Platform Designer Generate:

Quartus has 130 warnings, most are about alter_gio_lite.sv and DDR3 timing.  (I have tried a number of different things to resolve the DDR timing and nothing works.  But I get the errors on both 22 and 23 so I don't think that's the problem).

Let me know how else I can help.

Thanks for your time,

-Andy

[andy25]

... which is weird, because in this version of the project I've removed my use of gpio_lite.  Not sure if something else is using it though.  But I'm not intentionally using it anymore.

[wwanalim_intel]

Hi Andy,

Give me some time to take a look on it.

Thank you

[wwanalim_intel]

Hi,

Can I know where is this warning appeared "There is a warning saying Nios II only supports 32-bit, and that you'll need to "access the registers directly" ?

[andy25]

Platform Designer.  The first picture I posted. 4 messages down.

[wwanalim_intel]

Hi,

You can create an IPS ticket and share the design project. We will continue our support in the IPS case, with that

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