TM4C1290NCPDT: Port G per-pin GPIO interrupts always firing port G0 interrupt.

Doug Broadwell85

Part Number: TM4C1290NCPDT

I'm trying to use GPIO port G pins 0, 1, and 2 to generate individual interrupts. The interrupts for the 3 pins work, except that any interrupt on pins 1 or 2 also always generates an interrupt to the pin 0 ISR. GPIOIntEnable() in the Periperal Driver Library has this note:

Note:
If this call is being used to enable summary interrupts on GPIO port P or Q (GPIOIntTypeSet()
with GPIO_DISCRETE_INT not enabled), then all individual interrupts for these ports must be
enabled in the GPIO module using GPIOIntEnable() and all but the interrupt for pin 0 must be
disabled in the NVIC using the IntDisable() function. The summary interrupts for the ports are
routed to the INT_GPIOP0 or INT_GPIOQ0 which must be enabled to handle the interrupt. If
this is not done then any individual GPIO pin interrupts that are left enabled also trigger the
individual interrupts.

My code is:

    GPIOIntTypeSet(GPIO_PORTQ_BASE,
                   PQ_Fan1Cnt_BIT |
                   PQ_Fan2Cnt_BIT |
                   PQ_Fan3Cnt_BIT |
                   GPIO_DISCRETE_INT,
                   GPIO_FALLING_EDGE);

    GPIOIntRegisterPin(GPIO_PORTQ_BASE, 0, Fan1_Interrupt);
    GPIOIntRegisterPin(GPIO_PORTQ_BASE, 1, Fan2_Interrupt);
    GPIOIntRegisterPin(GPIO_PORTQ_BASE, 2, Fan3_Interrupt);

    #define INT_GPIOG_TM4C129    47

    IntDisable(INT_GPIOG_TM4C129);                              // Disable the not-per-pin interrupt
                                                                // on GPIO_INT_PIN_0.
    GPIOIntEnable(GPIO_PORTQ_BASE, GPIO_INT_PIN_0 |
                                   GPIO_INT_PIN_1 |
                                   GPIO_INT_PIN_2 );

I hard coded the "#define INT_GPIOG_TM4C129 47" from inc/hw_ints.h as when I include it I get a raft of "incompatible redifinition of macro ..." from tm4c1290ncpdt.h"

Thanks, Doug

over 4 years ago

0 Ralph Jacobi over 4 years ago

TI__Guru*** 135355 points

Hello Doug,

I'm a bit confused by your code here. I am seeing a lot of GPIO_PORTQ_BASE but you are asking about GPIO Port G. Is that maybe where some 'wires' are getting crossed?

0 Doug Broadwell85 over 4 years ago

Intellectual 540 points

My apologies, you are right, it's all port Q (I guess my flaring is dyslexia-ing again) %-)

0 Doug Broadwell85 over 4 years ago

Intellectual 540 points

Since there is'nt a "INT_GPIOQ_TM4C129" in inc/hw_ints.h I commented out the IntDisable(INT_GPIOQ_TM4C129) code (there is an "INT_GPIOQ0_TM4C129"). Problem persists.

0 Ralph Jacobi over 4 years ago in reply to Doug Broadwell85

TI__Guru*** 135355 points

Hi Doug,

Okay now I think I see your problem. You have DISCRETE_INT OR'd with the wrong variable on the interrupt set. Try this:

    GPIOIntTypeSet(GPIO_PORTQ_BASE,
                   PQ_Fan1Cnt_BIT |
                   PQ_Fan2Cnt_BIT |
                   PQ_Fan3Cnt_BIT,
                   GPIO_DISCRETE_INT |
                   GPIO_FALLING_EDGE);

You may need to enable all of INT_GPIOQ0_TM4C129, INT_GPIOQ1_TM4C129, and INT_GPIOQ2_TM4C129.

0 Doug Broadwell85 over 4 years ago in reply to Ralph Jacobi

Intellectual 540 points

Yo de Man.

That's it. Thank you.

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TM4C1290NCPDT: Port G per-pin GPIO interrupts always firing port G0 interrupt.