LPC1347 group pin int problem

[lubo]

Hi,

I have push buttons connected to ground on pins PIO0_1, PIO0_3 and PIO0_11. I want to use GROUP INTs on all three pins. If I use only 1 and 3 - it works! But if I include 11 - it doesn't.

Any help or ideas are appreciated! (tried software polling - everything is OK, they work, no hardware problems)

Regards,

L. B.

===========================================================================

#include "board.h"

#include "uart.h"

void GINT0_IRQHandler(void)

{

    Chip_GPIOGP_ClearIntStatus(LPC_GPIO_GROUP_INT0, 0);

    DEBUGOUT("INT\n\r");

}

int main(void)

{

    SystemCoreClockUpdate();

    Board_Init();

    init_uart();

    DEBUGOUT("Starting ...\n\r");

    Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 1, IOCON_FUNC0 | IOCON_MODE_PULLUP);

    Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 3, IOCON_FUNC0 | IOCON_MODE_PULLUP);

    Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 11, IOCON_FUNC1 | IOCON_MODE_PULLUP);

    Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, 0, 1);

    Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, 0, 3);

    Chip_GPIO_SetPinDIRInput(LPC_GPIO_PORT, 0, 11);

    Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_GROUP0INT);

    Chip_GPIOGP_SelectLowLevel(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 1);

    Chip_GPIOGP_SelectLowLevel(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 3);

    Chip_GPIOGP_SelectLowLevel(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 11);

    Chip_GPIOGP_EnableGroupPins(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 1);

    Chip_GPIOGP_EnableGroupPins(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 3);

    Chip_GPIOGP_EnableGroupPins(LPC_GPIO_GROUP_INT0, 0, 0, 1 << 11);

    Chip_GPIOGP_SelectOrMode(LPC_GPIO_GROUP_INT0, 0);

    Chip_GPIOGP_SelectEdgeMode(LPC_GPIO_GROUP_INT0, 0);

    NVIC_EnableIRQ(GINT0_IRQn);

    while (1) {    }

    return 0;

}

[soledad]

Hi L.B.,

Thank you for your input !!

Regards

Sol

[lubo · Accepted solution]

It appears that pins with both analog and digital function cannot use only this:

Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 11, IOCON_FUNC1 | IOCON_MODE_PULLUP);

they must enable the digital circuitry explicitly like this:

Chip_IOCON_PinMuxSet(LPC_IOCON, 0, 11, IOCON_FUNC1 | IOCON_MODE_PULLUP | IOCON_DIGMODE_EN);

This solved the problem for me! Hope it will help others too!

Cheerz,

L. B.