Amreen Ahmed

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11 years, 9 months ago.

__disable_irq()

Hi guys, I am working on my code which uses many different serial communication receiving interrupts. I am using disable_irq() to disable the interrupts when required and then enabling it.

My question is does it disable all the receiving interrupts running at the moment. If yes how can I disable specific interrupts.

Regards Kamil

3 Answers

Paul Staron
10 years, 11 months ago.

Here you go

IRQ Demo

#include "mbed.h"

DigitalOut myled(LED1);
DigitalOut myled2(LED2);

InterruptIn MyIRQ(p21);

void LED_on_off_IRQ(void)
{    
    myled=!myled;  // LED1 goes on or off every time p21 goes high.
} 


int main() {
      
while(1){
    
    myled2=1;
    
    MyIRQ.rise(LED_on_off_IRQ); // calls LED_on_off_IRQ when p21 goes high
    
    wait(5);
    
    myled2=0;
    
    MyIRQ.rise(NULL);  // stops the IRQ can't change LED1 state    

    wait(5);
 
 }

}

Accepted Answer

Thank you. Quite nice and simple example :)

posted by Amreen Ahmed 22 Mar 2014
Erik -
11 years, 9 months ago.

NVIC_DisableIRQ(UART0_IRQn) is probably the function you search.

Depending on your requirements you can also attach a NULL pointer with the mbed attach function (in case there is no detach function).

Thank you :)

posted by Amreen Ahmed 12 May 2013
Danilo Teran
10 years, 11 months ago.

hi, can you give me an example of disable the interrupts when required and then enabling it.

please i have problems