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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 08-23-2011, 09:31 AM   #1
vlrk
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Understanding Target Board schematic.


Hello All,

I donot know this is right forum to ask,if iam wrong plz move this mail to proper one.

Iam trying to undestand one target board schematic where it has referenses to the Led like GPIO7 , so can i assume the "7" as HwAddr where i can send input to enable / disable the led.


thanks & regards
rvara
 
Old 08-23-2011, 09:49 AM   #2
onebuck
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Hi,

Quote:
Originally Posted by vlrk View Post
Hello All,

I donot know this is right forum to ask,if iam wrong plz move this mail to proper one.

Iam trying to undestand one target board schematic where it has referenses to the Led like GPIO7 , so can i assume the "7" as HwAddr where i can send input to enable / disable the led.


thanks & regards
rvara
Little more information would help us to aid you.
Which Target board? PC104?

GPIO (General Purpose Input/Output) may help to understand things better. Your GPIO7 could be setup to control the LED state. You would need to define the explicit address somewhere and then send the control bit to turn the LED on/off.

FYI: I suggest that you look at 'How to Ask Questions the Smart Way' so in the future your queries provide information that will aid us in diagnosis of the problem or query.



BTW, LQ does have a spell checker for the reply window. Please do not use abbreviated or SMS text speak, spell your words out to provide a clear and concise post.

This thread will be moved to <Linux-Embedded> since I am sure we are speaking of a single board system or embed.


Last edited by onebuck; 08-23-2011 at 09:50 AM.
 
Old 08-23-2011, 10:07 AM   #3
salasi
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Quote:
Originally Posted by vlrk View Post

Iam trying to undestand one target board schematic where it has referenses to the Led like GPIO7 , so can i assume the "7" as HwAddr where i can send input to enable / disable the led.
Probably not in the sense that you seem to mean. (Actually, that is a technically incorrect answer; you can assume whatever you like, some assumptions will be more wildly incorrect than others, though.)

7 is probably the bit number in the port that drives this kind of output (It is a big clue if there are several lines, numbered GPIO0, GPIO1....GPIO7 might be a whole port, and that ought to be apparent from looking at the schematic).

How do you drive the port? Well, that depends on the port and whether it is driven directly from the microcontroller or there is some expansion device that drives it. With the level of information provided, it is difficult to be more specific.
 
  


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