2009-02-05 10:07:38     BF537 Ez Kit PPI - testing with oscilloscope (newbie question)

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2009-02-05 10:07:38     BF537 Ez Kit PPI - testing with oscilloscope (newbie question)

Jens Hansen (DENMARK)

Message: 68903   

 

Hi,

 

I've got my Ez kit up and running, and now I want to use the peripihals. I have got most things up and running, but the PPI makes my life difficult. Now I am at the point, where I just want to make some pins flick, so i can see that something is happening.

 

Problem 1:

 

When I include PPI driver under devicedriver, it seems like the driver is loaded under boot. This line comes up:

 

PPI: PPI-EKC Driver INIT IRQ:23

 

and theres a /dev/ppi

 

But when I'm running PPI test, it says no such file or directore (/dev/ppi)

 

So I did some searching and found, that this solved the problem:

 

mknod /dev/ppi0 c 10 249

 

Why doesn't this get correctly setup in the make?

 

Problem 2:

 

When I run the PPI test now, as a master, I choose a pattern, and I thought I could measure some data or sync signal on the PPI connector on the Ez kit board...but there's nothing? I've been searching for a solution for a long time now, but I think i'm getting near an answer.

 

Hope there is someone out there, able to help me?

 

(I've also tried to install a display driver for the LQ035, and running a videotest, but still there's nothing)

 

Best regards,

 

Jens

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2009-02-05 10:38:37     Re: BF537 Ez Kit PPI - testing with oscilloscope (newbie question)

Michael Hennerich (GERMANY)

Message: 68906   

 

Do you have some clock source connected to PPI_CLK?

 

Without external clock you won't see anything happening.

 

-Michael

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2009-02-05 12:59:42     Re: BF537 Ez Kit PPI - testing with oscilloscope (newbie question)

Izhar Eyal (ISRAEL)

Message: 68927   

 

check the BF537 datasheet, if the PPI pins are also PF pins (general purpose) than you can enable the GPIO driver instead of the PPI driver and test those pins to make sure they are toggling. use the GPIO test app or write a simple open/read/write/close app. than you could make sure using the scope that those lines are connected properly.

 

hope this helps.

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