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EK-TM4C123GXL: Detecting SW2

David Summers
Intellectual 485 points
Part Number: EK-TM4C123GXL


My code below detects SW1 - but doesn't detect SW2 - but think I'm configuring both the same ...

Not sure what I'm missing here

    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
    GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_4); // SW1
    GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_0); // SW2
    GPIODirModeSet(GPIO_PORTF_BASE, GPIO_PIN_4, GPIO_DIR_MODE_IN);
    GPIODirModeSet(GPIO_PORTF_BASE, GPIO_PIN_0, GPIO_DIR_MODE_IN);
    GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_4,
		     GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU); 
    GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_0,
		     GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);

    int32_t SWstatus=GPIOPinRead(GPIO_PORTF_BASE,
					    GPIO_PIN_4|GPIO_PIN_0)^17;

  • 0
    Intellectual 485 points

    And probably worth adding if I merge both buttons everywhere with GPIO_PIN_4 | GPIO_PIN_0 it makes no difference ...

  • +1 in reply to David Summers
    TI__Guru**** 191906 points

    Hi David,

      PF0 is a special pin. To reconfigure it, you need to unlock it first. 

    I tried the below code and it is working for me.  I put a breakpoint at SW2handler and it will stop at the ISR. 

    uint32_t count=0;

void SW2Handler (void)
{
    GPIOIntClear(GPIO_PORTF_BASE, GPIO_PIN_0);
    count++;

}
//*****************************************************************************
//
// Blink the on-board LED.
//
//*****************************************************************************
int
main(void)
{
    volatile uint32_t ui32Loop;
    uint32_t lock_value = 0xFFFFFFFF;


    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);

    //
    // Check if the peripheral access is enabled.
    //
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPIOF))
    {
    }
    HWREG(GPIO_PORTF_BASE+GPIO_O_LOCK) = GPIO_LOCK_KEY;
    HWREG(GPIO_PORTF_BASE+GPIO_O_CR) |= GPIO_PIN_0;
    lock_value = HWREG(GPIO_PORTF_BASE+GPIO_O_LOCK);

    GPIOPinTypeGPIOInput(GPIO_PORTF_BASE, GPIO_PIN_0);
    GPIOPadConfigSet(GPIO_PORTF_BASE, GPIO_PIN_0, GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);
    GPIOIntTypeSet(GPIO_PORTF_BASE, GPIO_PIN_0, GPIO_FALLING_EDGE);
    GPIOIntRegister(GPIO_PORTF_BASE, SW2Handler);
    GPIOIntEnable(GPIO_PORTF_BASE, GPIO_INT_PIN_0);
    IntEnable(INT_GPIOF);
    IntMasterEnable();

    // Loop forever.
    //
    while(1)
    {
    }
}

  • 0 in reply to Charles Tsai
    Intellectual 485 points

    Ta - that worked. Had to include hw_types.h and hw_gpio.h; and couldn't set lock_value so removed that bit. Which document did you get that from? I though I recalled SW2 had some special function, but didn't find you text in a document.

  • 0 in reply to David Summers
    TI__Guru*** 135355 points

    Hi David,

    FYI we also have a new TivaWare API for this in 2.2.0 if you use that version: 

    GPIOUnlockPin(GPIO_PORTF_BASE, GPIO_PIN_0);

    Table Charles showed is from device datasheet Slight smile.

    Best Regards,

    Ralph