How to setup GPIO_P4 and GPIO_P5 Interrupt?

Hello Jian,

1. Check that the code execution is not in Fault Handler
2. The IntEnable(INT_GPIOP) is also missing which allows the NVIC to see the interrupt for Port P.
3, Why is PORTA Base being used for PORTP???

Regards
Amit

Hello Amit,

       Thanks for your answer.

       Does it need to clear interrupt pending bit in interrupt function? 

Regards.

Li Jian Ri

Hello Li,

Absolutely. otherwise the interrupt handler will keep on exiting and then re-entering even if the pin state does not change,.

Regards
Amit

Hello Amit,

      How to clear the Pending bit of interrupt GPIO_P4 and GPIO_P5? Thanks!

Regards
Li Jian Ri

 

Hello Jian

Please go through the documentation on TivaWare API's. That would clearly describe the functions of the API's w.r.t configuration and servcing of interrupts

Regards
Amit

Hello Amit,

     I have found Interrupt Controller (NVIC) APIs in TivaWare™ Peripheral Driver Library USER’S GUIDE before,  The APIs are listed below. I have try the function IntPendClear(INT_GPIOP4), but it is no use.  Thanks for your help!

void IntDisable (uint32_t ui32Interrupt)
void IntEnable (uint32_t ui32Interrupt)
uint32_t IntIsEnabled (uint32_t ui32Interrupt)
bool IntMasterDisable (void)
bool IntMasterEnable (void)
void IntPendClear (uint32_t ui32Interrupt)
void IntPendSet (uint32_t ui32Interrupt)
int32_t IntPriorityGet (uint32_t ui32Interrupt)
uint32_t IntPriorityGroupingGet (void)
void IntPriorityGroupingSet (uint32_t ui32Bits)
uint32_t IntPriorityMaskGet (void)
void IntPriorityMaskSet (uint32_t ui32PriorityMask)
void IntPrioritySet (uint32_t ui32Interrupt, uint8_t ui8Priority)
void IntRegister (uint32_t ui32Interrupt, void (pfnHandler)(void))
void IntTrigger (uint32_t ui32Interrupt)
void IntUnregister (uint32_t ui32Interrupt)

Regards

Li Jian Ri

Hello Amit,

      I have found Interrupt 0-31 Clear Pending (UNPEND0), offset 0x280 in datasheet, should I use this register to clear the pending bit?

Regards

Li Jian Ri

Hello Amit
        I have wrote  HWREG(NVIC_UNPEND2) = NVIC_UNPEND2_INT_M; and IntPendClear(INT_GPIOP4); in my interrupt handler, it is no use.  the interrupt handler keep on exiting. Can you help me ? Thanks!

Regards
Li Jian Ri

Hello Jian,

You have to clear the interrupt source at the source, and the source is the GPIO. So you need to look into the GPIO API's for the corrective action.

Regards
Amit

Hello Amit,

         Thanks for your answer. It is ok!

         I have another question, I want to set up GPIO_P4 and GPIO_P5 interrupt handler in TI RTOS. I have setup GPIO_J port    interrupt  successfully. Some code is below:

const GPIO_Callbacks EK_TM4C1294XL_gpioPortJCallbacks = {
    GPIO_PORTJ_BASE, INT_GPIOJ, &callbackPortJHwi,
    {gpioButtonFxn0, gpioButtonFxn1, NULL, NULL, NULL, NULL, NULL, NULL}
};

     But if I change INT_GPIOJ to INT_GPIOP ,  it can't be compiled succesfully. Can you tell I should how to write? Thanks!

Regards
Li Jian Ri

 

Hello Li

GPIO P has its interrupt vector defined as P0, P1 and so on till P7.

Regards
Amit