12f675 interrupts

[bgpartri]

I am trying to set up an interrupt on GP03. I have looked at the interrupts that are defined in the .h file and they look like this:
#define GLOBAL 0x0BC0
#define INT_RTCC 0x0B20
#define INT_RB 0x0B08
#define INT_EXT 0x0B10
#define INT_AD 0x8C40
#define INT_TIMER1 0x8C01
#define INT_TIMER0 0x0B20
#define INT_EEPROM 0x8C80
#define INT_COMP 0x8C08
#define INT_RA0 0x010B08
#define INT_RA1 0x020B08
#define INT_RA2 0x040B08
#define INT_RA3 0x080B08
#define INT_RA4 0x100B08
#define INT_RA5 0x200B08


I can't make any sense of the INT_RA3 name or address. I assume that I need to use RA3 when the PIC actually calls them GPxx.

I could set them directly in INTCON and IOC, but I don't know what to use in the #INT_??? directive.

My requirement is to have a push button on pin 4. It has to be pin 4, because the other pins are used for either output or ADC. Any help or direction to documentation would be greatly appreciated.
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This message was ported from CCS's old forum
Original Post ID: 14034

[Mike Broom]

You will use the:

#INT_RA3
void int_on_change_GP03 (void)
{
//INT HANDLER
}

And your initialisation would be:

enable_interrupts(INT_RA3);

mike

:=I am trying to set up an interrupt on GP03. I have looked at the interrupts that are defined in the .h file and they look like this:
:=#define GLOBAL 0x0BC0
:=#define INT_RTCC 0x0B20
:=#define INT_RB 0x0B08
:=#define INT_EXT 0x0B10
:=#define INT_AD 0x8C40
:=#define INT_TIMER1 0x8C01
:=#define INT_TIMER0 0x0B20
:=#define INT_EEPROM 0x8C80
:=#define INT_COMP 0x8C08
:=#define INT_RA0 0x010B08
:=#define INT_RA1 0x020B08
:=#define INT_RA2 0x040B08
:=#define INT_RA3 0x080B08
:=#define INT_RA4 0x100B08
:=#define INT_RA5 0x200B08
:=
:=
:=I can't make any sense of the INT_RA3 name or address. I assume that I need to use RA3 when the PIC actually calls them GPxx.
:=
:=I could set them directly in INTCON and IOC, but I don't know what to use in the #INT_??? directive.
:=
:=My requirement is to have a push button on pin 4. It has to be pin 4, because the other pins are used for either output or ADC. Any help or direction to documentation would be greatly appreciated.
___________________________
This message was ported from CCS's old forum
Original Post ID: 14036

[R.J.Hamlett]

:=I am trying to set up an interrupt on GP03. I have looked at the interrupts that are defined in the .h file and they look like this:
:=#define GLOBAL 0x0BC0
:=#define INT_RTCC 0x0B20
:=#define INT_RB 0x0B08
:=#define INT_EXT 0x0B10
:=#define INT_AD 0x8C40
:=#define INT_TIMER1 0x8C01
:=#define INT_TIMER0 0x0B20
:=#define INT_EEPROM 0x8C80
:=#define INT_COMP 0x8C08
:=#define INT_RA0 0x010B08
:=#define INT_RA1 0x020B08
:=#define INT_RA2 0x040B08
:=#define INT_RA3 0x080B08
:=#define INT_RA4 0x100B08
:=#define INT_RA5 0x200B08
:=
:=
:=I can't make any sense of the INT_RA3 name or address. I assume that I need to use RA3 when the PIC actually calls them GPxx.
:=
:=I could set them directly in INTCON and IOC, but I don't know what to use in the #INT_??? directive.
:=
:=My requirement is to have a push button on pin 4. It has to be pin 4, because the other pins are used for either output or ADC. Any help or direction to documentation would be greatly appreciated.

Worth understanding here, that the 12 family chips, use a different naming convention from the rest of the PICs. On the 16, and 18 family, the ports are all referred to as port A, port B etc.. The 12 family chips, instead refer to them using the 'GP' name. The 67x, has the port register at the address used for 'port A' on the larger brethren, while the 508, puts the IO register at the address used for port B.
Why Microchip decided to call the ports 'GPIO' on the smaller chips, and port A, B etc., on the bigger chips, is really pretty inexplicable.
CCS C, uses the same names for these chips, so 'GPIO' is not used, instead these are addressed with the names used for the larger chips.
The answer to how this affects the name used for the interrupt routine, and addresses, has allready been posted.

Best Wishes
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This message was ported from CCS's old forum
Original Post ID: 14039

[TerryS]

:=You will use the:
:=
:=#INT_RA3
:=void int_on_change_GP03 (void)
:={
:=//INT HANDLER
:=}
:=
:=And your initialisation would be:
:=
:=enable_interrupts(INT_RA3);
:=
:=mike
:=
:=:=I am trying to set up an interrupt on GP03. I have looked at the interrupts that are defined in the .h file and they look like this:
:=:=#define GLOBAL 0x0BC0
:=:=#define INT_RTCC 0x0B20
:=:=#define INT_RB 0x0B08
:=:=#define INT_EXT 0x0B10
:=:=#define INT_AD 0x8C40
:=:=#define INT_TIMER1 0x8C01
:=:=#define INT_TIMER0 0x0B20
:=:=#define INT_EEPROM 0x8C80
:=:=#define INT_COMP 0x8C08
:=:=#define INT_RA0 0x010B08
:=:=#define INT_RA1 0x020B08
:=:=#define INT_RA2 0x040B08
:=:=#define INT_RA3 0x080B08
:=:=#define INT_RA4 0x100B08
:=:=#define INT_RA5 0x200B08
:=:=
:=:=
:=:=I can't make any sense of the INT_RA3 name or address. I assume that I need to use RA3 when the PIC actually calls them GPxx.
:=:=
:=:=I could set them directly in INTCON and IOC, but I don't know what to use in the #INT_??? directive.
:=:=
:=:=My requirement is to have a push button on pin 4. It has to be pin 4, because the other pins are used for either output or ADC. Any help or direction to documentation would be greatly appreciated.


When I try to use the #int_ra5 directive, I get an "Invalid Preprocessor Directive" error from the compiler (PCM 3.155). I was able to get an interrupt to work using #int_rb for the interrupt definition, and enable_interrupts(int_RA5). I am using the GP5 pin. This results in an interrupt when the level on pin 5 changes (either low to high or high to low). My problem is, I would like to use the ext_int_edge(L_to_H) to only cause an interrupt on the rising edge of my signal (I am using a 12f629). Any thoughts on why #int_ra5 causes a compile error, or why the edge triggered interrupt won't work???
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This message was ported from CCS's old forum
Original Post ID: 14147

[PCM programmer]

:=
:=When I try to use the #int_ra5 directive, I get an "Invalid Preprocessor Directive" error from the compiler (PCM 3.155). I was able to get an interrupt to work using #int_rb for the interrupt definition, and enable_interrupts(int_RA5). I am using the GP5 pin. This results in an interrupt when the level on pin 5 changes (either low to high or high to low). My problem is, I would like to use the ext_int_edge(L_to_H) to only cause an interrupt on the rising edge of my signal (I am using a 12f629). Any thoughts on why #int_ra5 causes a compile error, or why the edge triggered interrupt won't work???
--------------------------------------------------------

It doesn't work because...it's not used that way.
The INT_RA0 through INT_RA5 constants are only used
as parameters with these two functions:

enable_interrupts();
disable_interrupts();

Example:
enable_interrupts(INT_RA0);
disable_interrupts(INT_RA0);

As you discovered, these interrupts are processed by
an interrupt service routine that is prefixed with #int_rb.
Example:

#int_rb
void int_rb_isr(void)
{
// Do something here to process the interrupt.

}

---------------

You said that you want to use an edge triggered interrupt,
and you want to specify the polarity of the edge.
To do that, you need to use the "External Interrupt".
In the 12F629, that's on pin GP2. You must use that pin.

So your isr would look like this:

#int_ext
void int_ext_isr()
{

// Do something to process the external interrupt.

}


And you would enable it like this, in main():

void main()
{

output_float(PIN_A2); // Make pin GP2 into an input
ext_int_edge(L_TO_H);
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);

while(1);
}
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This message was ported from CCS's old forum
Original Post ID: 14160

[TerryS]

Thanks. I appreciate the help. It works fine with your suggestions.


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This message was ported from CCS's old forum
Original Post ID: 14162