How can i handle the pio in uclinux?

Altera_Forum · ‎12-14-2005

I have upload the kernal and filesystem to flash,and the kernal runs very well.Then i build the example 'hello world',it runs very well too.

Now i want to handle the PIO in uclinux,like 'hello led' in nios IDE,i make an application project ,but i can't use the API that ALTERA have provided, like IOWR_ALTERA_AVALON_PIO_DATA(LED_BASE, led).How can i do with it.

On the other hand,can any one tell me where can i download the nios-elf-tools(cross compile tool)in the linux.

Thanks.

Altera_Forum · ‎12-14-2005

you can best use the inl outl or inb outb macro's in linux for accessing the GPIO.

for the crosscompiler you can look for marc's one but I believe hissite is down at the moment http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif

Altera_Forum · ‎12-14-2005

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originally posted by wgoossens@Dec 14 2005, 06:41 PM

you can best use the inl outl or inb outb macro's in linux for accessing the gpio.

for the crosscompiler you can look for marc's one but i believe hissite is down at the moment http://forum.niosforum.com/work2/style_emoticons/<#emo_dir#>/sad.gif

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=11537)

--- quote end ---

--- Quote End ---

Thanks!

Can you tell me more about inl outl .....

Altera_Forum · ‎12-14-2005

try:# man inl

or# man outl

....

it basicaly reads a long (inl) or a byte (inb) from the port you pass as an argument or writes a long (outl) or a byte (outb).

for example:

outb(inb(GPIO1),GPIO2);

where GPIO1 and GPIO2 are defined as base-addresses of your GPIO components.

reads a byte from the base address of one GPIO and outputs this no a second GPIO.

Altera_Forum · ‎12-26-2005

In the header file...../bin/eclipse/plugins/com.microtronix.nios2linux.kernel_1.4.0/linux-2.6.x/include/asm-nios2nommu/io.h

There are # define writew(b,addr)

({

__asm__ __volatile__(

"sthio %0, 0(%1)"

: : "r"(http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/cool.gif , "r" (addr));

})

and other application like this.But in my Application Project,when i use writew or other application that has defined in the io.h,there are error undefined reference to `writew',I have include the header file like this# <asm/io.h>.Can anyone tell me why.

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

Altera_Forum · ‎12-26-2005

> there are error undefined reference to `writew',I have include the header file like

> this# <asm/io.h>.Can anyone tell me why.

__KERNEL__ must be defined. If you define this for an application, you'll likely pull in

other definitions that will cause compile-time problems. I recommend you copy the

macros you need into a header file in your application source tree. It'll probably save

you some headaches.

Regards,

--Scott