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PIC18F47K42 IOC on port A

 
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Momboz



Joined: 03 Jun 2009
Posts: 29

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PIC18F47K42 IOC on port A
PostPosted: Sat Oct 02, 2021 1:15 pm     Reply with quote

Hi

I am trying to get IOC on port A working and I couldn't find out how to do.



Code:
//Interrupt routine
#INT_IOC
void  IOC_isr(void) { output_toggle(PIN_B0); }

//main
void main() {
  enable_interrupts(INT_IOC | H_TO_L);
  enable_interrupts(GLOBAL);
  while(TRUE) {}
}

and this should toggle PIN_B0 each time I press a port A pin. Port A pins are pulled up and pressing will put those to ground.

Many thanks in advance
PCM programmer



Joined: 06 Sep 2003
Posts: 21508

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PostPosted: Sat Oct 02, 2021 10:33 pm     Reply with quote

See this sample code by Ttelmah for IOC interrupts on the K42 series PICs.
http://www.ccsinfo.com/forum/viewtopic.php?t=59364&start=22
Ttelmah



Joined: 11 Mar 2010
Posts: 17476

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PostPosted: Sun Oct 03, 2021 2:21 am     Reply with quote

Also as both a general, and 'specific' comment to what is being done,
#defines must _only_ be used for the commands for which they are
listed.
So the define 'H_TO_L', says
"// Constants used in EXT_INT_EDGE() are:".

This define cannot be used in the ENABLE/DISABLE interrupts command.
If you look for the defines for these commands, you see:

Code:

#define INT_IOC_A0_L2H               0x10010080
#define INT_IOC_A0_H2L               0x20010080


and similar ones for all the other pins. So to enable for all the pins
on Port A, you would OR together all the pin enables you want.

INT_IOC_A0_H2L| INT_IOC_A1 | INT_IOC_A2 | INT_IOC_A3|
INT_IOC_A4| INT_IOC_A5| INT_IOC_A6 |
INT_IOC_A7

There are separate bit enables for each pin. All pins though share the
direction control bit, so this only has to be enabled on one pin.
Momboz



Joined: 03 Jun 2009
Posts: 29

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PostPosted: Sun Oct 03, 2021 7:58 am     Reply with quote

PCM programmer wrote:
See this sample code by Ttelmah for IOC interrupts on the K42 series PICs.
http://www.ccsinfo.com/forum/viewtopic.php?t=59364&start=22


I had a look to the given example and I find it's easier to do it another way and at microcontroller level.

Code:
#byte IOCAF=getenv("SFR:IOCAF")
#byte IOCAP=getenv("SFR:IOCAP")
#byte IOCAN=getenv("SFR:IOCAN")
#byte PIE0=getenv("SFR:PIE0")

void main() {

  IOCAF = 0;                    // Clear any pending interrupt flag
  IOCAP = IOCAP | 0x00;         // do not react to positive edge
  IOCAN = IOCAN | 0xFF;         // React to negative edge
  PIE0 = PIE0 | 0b10000000;     // Activate PIE interrupts
  enable_interrupts(GLOBAL);

while(1) {}

Many thanks.
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