GPIO PIN interrupt is not working in LPC 1837

ponalagappan — Thu, 22 Sep 2016 07:33:02 GMT

Hi,

I am trying to use GPIO PIN interrupt in lpc1837. i need active low interrupt. initially i set the GPIO port and pin in PINTSEL0 register and verified its value.

then doing with configuration registers ISEL,IENR and IENF as follows

/* enable level interrupt */

LPC_GPIO_PIN_INT->ISEL = (GPIO_PIN_INT_ISEL_PMODE0_Msk |
GPIO_PIN_INT_ISEL_PMODE1_Msk);

/* enable level interrupt */

LPC_GPIO_PIN_INT->IENR = (GPIO_PIN_INT_IENR_ENRL0_Msk |
GPIO_PIN_INT_IENR_ENRL1_Msk );

LPC_GPIO_PIN_INT->SIENR = ( GPIO_PIN_INT_SIENR_SETENRL0_Msk |
GPIO_PIN_INT_SIENR_SETENRL1_Msk );

/* enable active LOW interrupt */

LPC_GPIO_PIN_INT->IENF = 0x00UL;

LPC_GPIO_PIN_INT->CIENF = (GPIO_PIN_INT_CIENF_CENAF0_Msk |
GPIO_PIN_INT_CIENF_CENAF1_Msk );

when i set the values for SIENR, it immediately sets the IST register PSTAT0 and PSTAT1 flag. but it should not happen. my hardware pin state is HIGH in normal, upon interrupt it provides LOW.

Is that my way is correct of doing , any suggestions?

Re: GPIO PIN interrupt is not working in LPC 1837

jeremyzhou — Tue, 27 Sep 2016 06:35:50 GMT

Hi pon alagappan,

I'd highly recommend you to refer to the pinint demo which illustrates configure a pin interrupt as a falling edge interrupt.

And you can download the LPCOpen through the link below.

LPCOpen Software for LPC18XX|NXP

Have a great day,
Ping

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GPIO PIN interrupt is not working in LPC 1837

Re: GPIO PIN interrupt is not working in LPC 1837