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Dear Experts,

Could you please help me understand the following:

What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 

In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas rest
of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 

And if you can share simple code-snippet that will be great.

Hope my question is clear, if not, please let me know.

Thanks,
Yatin

_____________________________________

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Yatin,
I don't know the TMS320C6412 (I just use TMS320C6713), but in general for GPIO
you have to take into into account two things.
First and most important, some pins are multiplexed so their usage depends on
whether or not the configuration selected at power on enables (= pin available
for GPIO) or disables (= pin used for other purpose (i.e. a different
peripheral)) them.
Second, not all GPIO pins have a "dedicated interrupt".
This means that for some pins you can have dedicated (and separated) ISRs.
For the remaining one you can have interrupt, but you just have one for all of
them (that is GPINT0 for my TMS320C6713).
No problem in case the pins you use are grouped (used as a "port"),
but in case you have separated usages/functions for each pin inside the unique
ISR you have to check which is the pin and then act the dedicated handling.

Hope this will help and hope it's the same on your TMS320C6412. In any case you
have to refer to your DSP manual (look for "external interrupt
sources").

Paolo
  ----- Original Message ----- 
  From: y...@hotmail.com 
  To: c...@yahoogroups.com 
  Sent: Friday, October 21, 2011 3:36 AM
  Subject: [c6x] Difference between Interrupt on bit change and External IRQ
    
  Dear Experts,

  Could you please help me understand the following:

  What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 

  In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas rest
of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 

  And if you can share simple code-snippet that will be great.

  Hope my question is clear, if not, please let me know.

  Thanks,
  Yatin
  

______________________________
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(You need to be a member of c6x -- send a blank email to c6x-subscribe@yahoogroups.com )

Hi Yatin,
The answer is 
"Interrupt on bit change on a GPIO port" 
this is default configured to INT means No need for you to set high and and low
when the signal is recieved.It automatically acts as an Intr pin and the sgnal
is detected and fed to ISR
 
 "GPIO which can be used as External IRQ" 
This you have to set the direction,Set the MUX reg fo the configuration
configure the pin for rising edge or falling edge..
 
 
Hope this answers your question.
 
if you want to know  the functions and respective settings for an extrenal
interrupt
 on andoid.
 
 
Go to arch/arm/mach-platform(your platform ex davinci) and see the board.c
 
Regards
Mahesh Kumr.S
--- On Sat, 10/22/11, Proware (tin.it) <p...@tin.it> wrote:
From: Proware (tin.it) <p...@tin.it>
Subject: Re: [c6x] Difference between Interrupt on bit change and External IRQ
To: y...@hotmail.com, c...@yahoogroups.com
Date: Saturday, October 22, 2011, 12:34 PM

 

Yatin,
I don't know the TMS320C6412 (I just use TMS320C6713), but in general for
GPIO you have to take into into account two things.
First and most important, some pins are multiplexed so their usage depends on
whether or not the configuration selected at power on enables (= pin available
for GPIO) or disables (= pin used for other purpose (i.e. a different
peripheral)) them.
Second, not all GPIO pins have a "dedicated interrupt".
This means that for some pins you can have dedicated (and separated) ISRs.
For the remaining one you can have interrupt, but you just have one for all of
them (that is GPINT0 for my TMS320C6713).
No problem in case the pins you use are grouped (used as a "port"),
but in case you have separated usages/functions for each pin inside the unique
ISR you have to check which is the pin and then act the dedicated handling.
 
Hope this will help and hope it's the same on your TMS320C6412. In any case you
have to refer to your DSP manual (look for "external interrupt
sources").
 
Paolo
 
 

----- Original Message ----- 
From: y...@hotmail.com 
To: c...@yahoogroups.com 
Sent: Friday, October 21, 2011 3:36 AM
Subject: [c6x] Difference between Interrupt on bit change and External IRQ

  

Dear Experts,

Could you please help me understand the following:

What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 

In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas rest
of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 

And if you can share simple code-snippet that will be great.

Hope my question is clear, if not, please let me know.

Thanks,
Yatin

______________________________
New Code Sharing Section now Live on DSPRelated.com. Learn about the Reward Program for Contributors here.



(You need to be a member of c6x -- send a blank email to c6x-subscribe@yahoogroups.com )

Thank you very much both of you. I was able to implement the firmware for
GPIO 4,5,6,7 which are used as EXT interrupt. And it works fine. 

I'll really appreciate if someone can please share a simple code snippet for how
to do the "Interrupt on bit change on a GPIO pin". I just want to
verify this theory.

Thanks in advance,
Y
Dear Experts,
>
>Could you please help me understand the following:
>
>What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 
>
>In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas
rest of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 
>
>And if you can share simple code-snippet that will be great.
>
>Hope my question is clear, if not, please let me know.
>
>Thanks,
>Yatin
>
>_____________________________________

_____________________________________

______________________________
New Code Sharing Section now Live on DSPRelated.com. Learn about the Reward Program for Contributors here.



(You need to be a member of c6x -- send a blank email to c6x-subscribe@yahoogroups.com )

Yatin,
I don't have code snippet for the test you need, but I suggest the method I used
when I had to check GPIO.
If possible, just use an output pin connected to one of your input pin to check
everything works on bit change.
This can be done if your board has one free input and one free output GPIO pin
or if the source is external to the board so that you can safely disconnect it,
you just have to avoid short circuits that you could have while you drive the
GPIO output pin.
This is good for avoiding the glitches that could fake test results when using
external harness.
Be sure you always start from scratch (i.e. you always fully initialize GPIO at
the beginning of your test).

Paolo
  ----- Original Message ----- 
  From: y...@hotmail.com 
  To: c...@yahoogroups.com 
  Sent: Monday, October 24, 2011 3:21 PM
  Subject: [c6x] Re: Difference between Interrupt on bit change and External
IRQ
    
  Thank you very much both of you. I was able to implement the firmware for GPIO
4,5,6,7 which are used as EXT interrupt. And it works fine. 

  I'll really appreciate if someone can please share a simple code snippet for
how to do the "Interrupt on bit change on a GPIO pin". I just want to
verify this theory.

  Thanks in advance,
  Y

  Dear Experts,
  >
  >Could you please help me understand the following:
  >
  >What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 
  >
  >In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas
rest of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 
  >
  >And if you can share simple code-snippet that will be great.
  >
  >Hope my question is clear, if not, please let me know.
  >
  >Thanks,
  >Yatin
  >
  >_____________________________________
  >
  >
  

______________________________
Start your Android Ice Cream Sandwich development on TI's AM35x Sitara ARM Cortex-A8 processor today.



(You need to be a member of c6x -- send a blank email to c6x-subscribe@yahoogroups.com )

Hi Paolo,

Thanks again. So what you are suggesting is do a loopback between two gpios  and
configure one of these two gpios as input and other as output. Then implement
the code to verify the theory.

Thanks, this is doable. I've do have spare GPIOs.

-yatin

Dear Experts,
>
>Could you please help me understand the following:
>
>What is the difference between "Interrupt on bit change on a GPIO
port" and "GPIO which can be used as External IRQ" 
>
>In case of TMS320C6412, GPIO 4,5,6,7 can be used as External IRQs whereas
rest of the GPIOs can be used as interrupt. But honestly I don't understand the
difference between the two. 
>
>And if you can share simple code-snippet that will be great.
>
>Hope my question is clear, if not, please let me know.
>
>Thanks,
>Yatin
>
>_____________________________________

_____________________________________

______________________________
Start your Android Ice Cream Sandwich development on TI's AM35x Sitara ARM Cortex-A8 processor today.



(You need to be a member of c6x -- send a blank email to c6x-subscribe@yahoogroups.com )