Interrupts 🔴 PIC Microcontroller Programming Tutorial #5 MPLAB in C

In this PIC programming tutorial I will demonstrates how to setup the high and low priority interrupt with external inputs via buttons. Using the XC8 compiler with MPLAB X and a PIC18F4520 PIC microcontroller.

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00:00 Intro
00:06 PIC Microcontroller Schematic
00:26 Code Setup
01:30 Interrupt Vectors
01:49 Interrupt Logic
02:17 INTCON Register 1
02:26 INTCON Code
02:42 RCON Register
02:58 RCON code
03:09 Exturnal Interrupt 0
04:07 Interrupt Service Routine Code
05:03 Exturnal Interrupt 0 Demo
05:22 Low Priority Interrupt Code
06:06 INT1 Setup
07:45 Low Priority Interrupt Demo
08:00 Code Recap
09:51 Outro

#picprogramming #picmicrocontroller #MPLAB

[BinderTronics]

Under compiler XC8 v2.00 and up the ISR functions change to:

- #include <pic18f4520>
- void __interrupt() high_isr(void);
- void __interrupt(low_priority) low_isr(void);

Credit to user Peng of for informing me of this.

[L.Lagrange]

Hey man I really appreciate you making this series. I will be referencing it many times over the next few months during my UMN EE microcontrollers class!

[muhammadfaizan]

nice Explanation sir. please make more video on interrupt examples.

[stanholmes]

Hi
Excelent explination on interrupts

[elless]

Hello. Thanks for video. Can you tell me the benefit of using interrupts instead of doing the same just with normal digital inputs? Thanks

[lukev]

I have been enjoying this playlist so far, but I have two questions.

1. Around 6:51, you use INT1E and INT1P instead of INT1IE and INT1IP like the datasheet says. Is that like a shorthand that means the same thing?

2. What is the purpose of using low priority vs high priority in this example? In both cases they did the same task. I believe this only matters when both buttons are pressed since the high priority would be the only LED on, but is this the case or no? I apologize if you mentioned this already, but after swiping through the video a few times, I could not find this addressed.

[willashland]

Great videos and love your accent mate. Are you South African?

[DanielCharry]

Outstanding tutorial. It would be nice to have a parallel one on mpasm though. Bravo!

[lukagacnik]

Can you explain, why does "GIEL" and "GIEH" need to be set HIGH in the main code? Great video by the way! :)

[gunalann]

we didn't write the function of rb0 and rb1 in the main function how did the microcontroller identify while giving input from the switch?

[mrafayshams]

If we want to have the INT2 interrupt, will we need to add another isr or will need another if statement in the high_isr(){...} ?

[mrafayshams]

I get an error: variable has incomplete type 'void' when I try to name the isr function as
void interrupt highISR(void).

How to find what is a way to name the ISR function?

[toysandgames]

Can pic18's family do everything, including motor control, because I have seen pic 32 of a university, its applications are so great that I'm bewildered. , I watch the project about pic 32 via Bruce Land's Youtube channel

[littlekarthick]

Hi, Do some example program ON LED blinking continuously after one press on the button and OFF LED blinking after one press on the button.

[Tom-k-tech]

Hi, Great job!
Is it possible to put in e.g.--- __delay_ms(200);---- to somewhere to avoid debouncing?
Thanks!

[StoriesoftheSoul]

Hi,
Sir I just need ur help I hope u will be biggest help sir I'm currently doing a project in which I'm interfacing pic16F877a microcontroller with Max7219 dot matrix module. Can u guide me sir regarding this
Regards

[vaibhavkapadia]

@binder tronics
sir i am using PIC18F47Q10 for my project i am currently facing an issue that my main function is repeating itself infinitely i am using internal oscillator at 8MHZ and beside this i am not able to use interrupts i have set all the bits required for generating interrupt but i am not able to use interrupt flag for Rx and Tx in EUSART please guide me

[sailfromsurigao]

Hi, i added delays as debouncing. But I'm getting an error of "interruptsmain.c:12:6: error: variable has incomplete type 'void'
void interrupt high_priority high_isr(void)"

[LeonardCotrimFreundl]

But how does the PIC know where there is going to be a rising/falling Edge?

[sailfromsurigao]

Hi, I tried simulating the circuit in proteus and loaded the hex file of the code but LED's are not turning on. Please help