topic Re: GPIO External Interrupt falling edge in LPC Microcontrollers

GPIO External Interrupt falling edge

k_sunilgupta — Thu, 16 Jun 2022 09:50:19 GMT

Hey all,

is there any example code for external interrupt (falling edge) in LPC54606J512BD100 micro-controller.

If any one have the reference then please let me know, i tried but did not found the example code for this.

@nxp @xiangjun_rong @nxp_敢爷

Re: GPIO External Interrupt falling edge

xiangjun_rong — Thu, 16 Jun 2022 11:02:55 GMT

Hi,

Yes, there is PINT example, which is loicated in driver_example->PINT->pint_pin_interrupt as the following screenshot.

Hope it can help you

XiangJun Rong

Re: GPIO External Interrupt falling edge

k_sunilgupta — Thu, 16 Jun 2022 11:10:27 GMT

thankyou.

Re: GPIO External Interrupt falling edge

k_sunilgupta — Fri, 17 Jun 2022 07:19:16 GMT

i have run the program as you suggest and its working properly,

and i convert it on register level which also working fine but when i use to check the status of external interrupt is not working and when i use its API function its working fine.

could you please tell me where i am wrong?

here is my code:- External interrupt 0 rising edge

SYSCON->AHBCLKCTRL[0] |= 0x00000800;
SYSCON->AHBCLKCTRL[0] |= 0x00004000; // GPIO0

INPUTMUX->PINTSEL[0] = 0x06; // P0_6

SYSCON->AHBCLKCTRL[0] |= 0x00040000;

PINT->ISEL = 0x00; // edge mode
PINT->SIENR |= 0x01; // rising mode
NVIC->ISER[0] |= 0x00000010; // pin interrupt 0 enable

when i use below API function with above function its working fine

void pint_intr_callback(pint_pin_int_t pintr, uint32_t pmatch_status)
{
flagStatus = true;
//PRINTF("\f\r\nPINT Pin Interrupt %d event detected.", pintr);
}

and when i am using my function its not working

void Rising_edge(void)
{
if(PINT->IST & 0x01) // check status
{
PINT->RISE |= 0x01; // clear rising flag
flagStatus = true;

}
}

Re: GPIO External Interrupt falling edge

xiangjun_rong — Mon, 20 Jun 2022 01:33:57 GMT

Hi,

Frankly speaking, I do not know your current problem clearly.

As you know that the callback function is called in ISR, so you have to enable interrupt mode, after the ISR is entered, then the callback function is called.

Regarding your function:

void Rising_edge(void)
{
if(PINT->IST & 0x01) // check status
{
PINT->RISE |= 0x01; // clear rising flag
flagStatus = true;

}
}

I suppose you want to clear the status falg. Pls try to use the code:

void Rising_edge(void)
{
if(PINT->IST & 0x01) // check status
{
PINT->IST|= 0x01; // clear rising flag
flagStatus = true;

}
}

Re: GPIO External Interrupt falling edge

k_sunilgupta — Mon, 20 Jun 2022 04:53:20 GMT

thanktyou.