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benoitstjean
Joined: 30 Oct 2007
Posts: 566
Location: Ottawa, Ontario, Canada
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| PIC24EP512 - Interrupt-on-change [Solved] |
 Posted: Sun Jan 28, 2024 4:07 pm |
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Device: PIC24EP512GP806
Compiler: 5.026
Hi guys,
Quick question: I'm going through the docs and its been a little while but on my device (see above), I'm trying to find in the docs which pins are allowed to be configured as an INT_CNI. So far I have RE5, RG6, RG7, RG8, RB5 and RB4 set as INT_CNI and only RG6 and RG8 trigger.
Thanks,
Ben
Last edited by benoitstjean on Mon Feb 05, 2024 12:55 pm; edited 1 time in total |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Mon Jan 29, 2024 12:12 am |
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Every input pin can be set to give an interrupt on change.
Post how you are setting this up, and trying to use this.
I also note you have a very old compiler. I'll have to check and see
if yours works correctly for this. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Mon Jan 29, 2024 4:33 am |
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OK.
I did a quick test program, that works, then tried to compile it with 5.026.
Glaring problem. Your compiler does not have the set_analog_pins function.
Now on a lot of the later chips there are separate registers (as distinct from
the ADC setup registers), to configure pins for analog or digital I/O. The
set_analog_pins function controls the bits in these. The setup_adc_ports
function does turn these off, so are you using this?.
This functions, compiled with your compiler works.
| Code: |
#include <maincni.h>
//select pins to use
#DEFINE CHANGE0 PIN_E5
#DEFINE CHANGE1 PIN_G6
#DEFINE CHANGE2 PIN_G7
#DEFINE CHANGE3 PIN_G8
#DEFINE CHANGE4 PIN_B5
#DEFINE CHANGE5 PIN_B4
int1 PINstate[6], OLDstate[6];
//Now since variable I/O is very inefficient, using macros instead
#define CAT(a) CHANGE##a
#define TEST_PIN(num) PINstate[num]=input(cat(num)); //test if pin changed
#define CLEAR_PIN(num) OLDstate[num]=PINstate[num]; //reset change
#define SETUP(num) set_pullup(TRUE, cat(num)); \
PINstate[num]=input(cat(num)); \
enable_interrupts(INTR_CN_PIN | cat(num)); //setup interrupt on a pin
#INT_CNI
void change_interrupt(void)
{
//Now we need to read each pin for change
TEST_PIN(0)
{
CLEAR_PIN(0);
//Code for this pin here
}
TEST_PIN(1)
{
CLEAR_PIN(1);
//Code for this pin here
}
TEST_PIN(2)
{
CLEAR_PIN(2);
//Code for this pin here
}
TEST_PIN(3)
{
CLEAR_PIN(3);
//Code for this pin here
}
TEST_PIN(4)
{
CLEAR_PIN(4);
//Code for this pin here
}
TEST_PIN(5)
{
CLEAR_PIN(5);
//Code for this pin here
}
}
void main()
{
//First need to ensure analog features are disabled.
setup_adc_ports(NO_ANALOGS); //ensure ANSEL is set off
//Now on boot need to read the current states, and then enable
SETUP(0);
SETUP(1);
SETUP(2);
SETUP(3);
SETUP(4);
SETUP(5);
//Now the global interrupt
enable_interrupts(GLOBAL);
while(TRUE)
{
//Whatever you want.
delay_us(10);
}
}
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benoitstjean
Joined: 30 Oct 2007
Posts: 566
Location: Ottawa, Ontario, Canada
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| Posted: Mon Jan 29, 2024 8:29 am |
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Thanks for the details info.
I guess I didn't hit "submit" yesterday but I finally got it to work after enabling the set_pullup() for each pin.
And yes, I know for sure that my compiler is old but it does what I need it to do and I'm used to it. I have to check what the new version does... when I have a moment.
Thanks for all your help!
Ben |
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