External interrupt issues

chenbingjy

External interrupt issues [Copy link]

I made a small board with CC2541, which has 10 buttons and a light.

Tried external interrupt, found that it sometimes worked and sometimes didn't, there was some erroneous operation.

The procedure is as follows:

/****************************************************** ***************************

* Name: InitKey()

* Function: Set the IO port corresponding to KEY, using interrupt mode

* Input parameters: None

* Export parameters: None

*************************************************** ******************************/

void InitKey()

{

P0IEN |= 0xf3; // P0.1 is set to interrupt mode 1: interrupt enable

PICTL |= 0xf3; // falling edge trigger

IEN1 |= 0x20; //Enable P0 port interrupt;

P0IFG = 0x00; // Initialize interrupt flag

P1IEN |= 0x0f; // P0.1 is set to interrupt mode 1: interrupt enable

PICTL |= 0x0f; //Falling edge trigger

IEN2 |= 0x10; //Enable P1 port interrupt;

P1IFG = 0x00; // Initialize interrupt flag

EA = 1; // Enable general interrupt

}

/****************************************************** ***************************

* Name: P0_ISR(void) interrupt processing function

* Description: #pragma vector = interrupt vector, followed by interrupt handler

*************************************************** ******************************/

#pragma vector = P0INT_VECTOR

__interrupt void P0_ISR(void)

{

DelayMS(20); //delay debounce

LED1 = ~LED1; //Change LED1 status

P0IFG = 0; // Clear interrupt flag

P0IF = 0; // Clear interrupt flag

}

/****************************************************** ***************************

* Name: P1_ISR(void) interrupt processing function

* Description: #pragma vector = interrupt vector, followed by interrupt handler

*************************************************** ******************************/

#pragma vector = P1INT_VECTOR

__interrupt void P1_ISR(void)

{

DelayMS(20); //delay debounce

LED1 = ~LED1; //Change LED1 status

P1IFG = 0; // Clear interrupt flag

P1IF = 0; // Clear interrupt flag

}

I have a 20ms delay, but it doesn't work. Can anyone tell me how to fix this? Thanks!

chunyang

In the interrupt service program, first delay and eliminate jitter, then read the IO status of the interrupt, return the key value or judge it as interference, and finally allow the external interrupt again and return.

chenbingjy

chunyang posted on 2019-9-9 13:59 In the interrupt service program, first delay and debounce, then read the IO status of the interrupt, return the key value or judge it as interference, and finally allow the external interrupt again and return.

Thanks! I'll try it.