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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| interrupt_enabled()? |
 Posted: Tue Mar 15, 2011 10:17 am |
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Hi,
Is there any way to check if a certain interrupt is enabled? interrupt_active() isn't what I want, I just would like to check if a certain interrupt is enabled and act upon that. Is there a generic way or should I just set my own global flag?
Thank you! |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Tue Mar 15, 2011 11:21 am |
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You can check the enable bit for the corresponding interrupt.
You can also set your own global bit if you want.
Either way will work.
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Tue Mar 15, 2011 11:27 am |
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| Yes, I found this thread: http://www.ccsinfo.com/forum/viewtopic.php?t=16290&view=previous that explains somewhat how to check the interrupt flag but i've looked at the datasheet (18f87k22) and i don't see a specific enable bit for INT_RDA, but only the PEIE/GIEL: Peripheral Interrupt Enable bit thus I went ahead and implemented my own flag, it however would be nice to go "the generic way" if somehow possible, any clues? |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Tue Mar 15, 2011 11:34 am |
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You need to search for
RC2IE and TX2IE in the 18f87k22 datasheet.
I just looked and it took longer to download the datasheet than to thumb through the section on interrupts manually.
-Ben
EDIT: Sorry - Typo TX1IE & RC1IE
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D
Last edited by bkamen on Tue Mar 15, 2011 11:44 am; edited 1 time in total |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Tue Mar 15, 2011 11:38 am |
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But look what it says in the note to the PIR registers:
Note 1: Interrupt flag bits are set when an interrupt
condition occurs regardless of the state of
its corresponding enable bit or the Global
Interrupt Enable bit, GIE (INTCON<7>)
This is not what I want to know, I would like to know if it has been enabled and not if it's condition has occured...and the GIE only has the global peripherial bit.... weird... |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Tue Mar 15, 2011 11:45 am |
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| cerr wrote: | But look what it says in the note to the PIR registers:
Note 1: Interrupt flag bits are set when an interrupt
condition occurs regardless of the state of
its corresponding enable bit or the Global
Interrupt Enable bit, GIE (INTCON<7>)
This is not what I want to know, I would like to know if it has been enabled and not if it's condition has occured...and the GIE only has the global peripherial bit.... weird... |
Like I said, Look for TX1IE and RC1IE.
Those are the enable bits for UART1.
Your first post asks for checking on UART1... so I don't know why you're looking at GIE.
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Tue Mar 15, 2011 11:53 am |
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Okay, yes got it now... bit5 but how do I check for this? How do I tell the compiler to look at bit 5 in PIE1?
I see the #bit directive in the manual but am not quite sure how to use it - looked at examples but still... suggestions? Thanks |
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bkamen
Joined: 07 Jan 2004
Posts: 1615
Location: Central Illinois, USA
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| Posted: Tue Mar 15, 2011 11:59 am |
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| cerr wrote: | Okay, yes got it now... bit5 but how do I check for this? How do I tell the compiler to look at bit 5 in PIE1?
I see the #bit directive in the manual but am not quite sure how to use it - looked at examples but still... suggestions? Thanks |
PCM just listed an example for someone else recently... it goes like this:
#byte PIR1 = getenv("sfr:PIR1")
#bit RC1IE = PIR1.5
or you can try
#bit RC1IE = getenv("bit:RC1IE")
I usually do the first one.
Now, in your code, you can say, if (RC1IE)
-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D |
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SherpaDoug
Joined: 07 Sep 2003
Posts: 1640
Location: Cape Cod Mass USA
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| Posted: Tue Mar 15, 2011 12:01 pm |
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How about the bit_test() function?
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The search for better is endless. Instead simply find very good and get the job done. |
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cerr
Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC
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| Posted: Tue Mar 15, 2011 12:28 pm |
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| bkamen wrote: |
#byte PIR1 = getenv("sfr:PIR1")
#bit RC1IE = PIR1.5
or you can try
#bit RC1IE = getenv("bit:RC1IE")
I usually do the first one.
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The first one actually doesn't work for me, I tried both and ended up sticking with the second one. Thanks  |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Mar 15, 2011 2:58 pm |
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I posted a macro to do this in this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=42353
Here's a test program for it. These macros use the INT_xxx definitions
at the end of the PIC's .h file. So for the GLOBAL interrupt it actually
checks to see if both GIE and PEIE are set, because both those bits are
in the CCS definition.
| Code: |
#include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
#ifdef __PCM__
#define interrupt_enabled(x) !!(*make8(x,1) & make8(x,0))
#endif
#ifdef __PCH__
#define interrupt_enabled(x) !!(*(make8(x,1) | 0xF00) & make8(x,0))
#endif
//==========================================
void main()
{
int8 gie_flag;
int8 ext_flag;
if(interrupt_enabled(GLOBAL))
{
gie_flag = TRUE;
}
if(interrupt_enabled(INT_EXT))
{
ext_flag = TRUE;
}
while(1);
} |
A few months ago I emailed CCS and proposed that they add this
feature to the compiler. But I guess they didn't like the idea. |
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