LM3S1138 Getting Started 3, Interrupts

// Include necessary header files
#include "LED.H"
#include
#include
#include
#include > #include
#include
#include
#include

// Define longer identifiers as shorter forms
#define SysCtlPeriEnable SysCtlPeripheralEnable
#define SysCtlPeriDisable SysCtlPeripheralDisable
#define GPIOPinTypeIn GPIOPinTypeGPIOInput
#define GPIOPinTypeOut GPIOPinTypeGPIOOutput
#define GPIOPinTypeOD GPIOPinTypeGPIOOutputOD

//Define KEY
#define KEY_PERIPH SYSCTL_PERIPH_GPIOG
#define KEY_PORT GPIO_PORTG_BASE
#define KEY_PIN GPIO_PIN_5

// Prevent JTAG from failing
void JTAG_Wait(void)
{
    SysCtlPeriEnable(KEY_PERIPH); // Enable the GPIO port where KEY is located
    GPIOPinTypeIn(KEY_PORT, KEY_PIN); // Set the pin where KEY is located to input

    if ( GPIOPinRead(KEY_PORT , KEY_PIN) == 0x00 ) // If KEY is pressed during reset, enter
    {
        for (;;); // Infinite loop to wait for JTAG connection
    }

    SysCtlPeriDisable(KEY_PERIPH); // Disable the GPIO port where KEY is located
}

// GPIOD interrupt initialization
void GPIOD_IntInit(void)
{
    SysCtlPeriEnable(SYSCTL_PERIPH_GPIOD); // Enable GPIOD port
    GPIOPinTypeIn(GPIO_PORTD_BASE, GPIO_PIN_1); // Set PD1 pin to input

    GPIOIntTypeSet(GPIO_PORTD_BASE, //Set the interrupt type of
                   PD1GPIO_PIN_1,
                   GPIO_LOW_LEVEL); //Low level trigger

    GPIOPinIntEnable(GPIO_PORTD_BASE , GPIO_PIN_1); // Enable PD1 pin interrupt
    IntEnable(INT_GPIOD); // Enable GPIOD port interrupt
}

// GPIOG interrupt initialization
void GPIOG_IntInit(void)
{
    SysCtlPeriEnable(SYSCTL_PERIPH_GPIOG); // Enable GPIOG port
    GPIOPinTypeIn(GPIO_PORTG_BASE, GPIO_PIN_5); // Set PG5 pin as input

    GPIOIntTypeSet(GPIO_PORTG_BASE, //Set PG5 interrupt type
                   GPIO_PIN_5,
                   GPIO_LOW_LEVEL); //Low level trigger

    GPIOPinIntEnable(GPIO_PORTG_BASE , GPIO_PIN_5); // Enable PG5 pin interrupt
    IntEnable(INT_GPIOG); // Enable GPIOG port interrupt
}

// System initialization
void SystemInit(void)
{
    SysCtlLDOSet(SYSCTL_LDO_2_50V); // Set LDO output voltage

    SysCtlClockSet(SYSCTL_USE_OSC | // System clock setting, using the main oscillator
                   SYSCTL_OSC_MAIN |
                   SYSCTL_XTAL_6MHZ |
                   SYSCTL_SYSDIV_1);

/*
    SysCtlLDOSet(SYSCTL_LDO_2_75V); // Before configuring PLL, set the LDO voltage to 2.75V

    SysCtlClockSet(SYSCTL_USE_PLL | // System clock setting, using PLL
                   SYSCTL_OSC_MAIN | // Main oscillator
                   SYSCTL_XTAL_6MHZ | // External 6MHz crystal oscillator
                   SYSCTL_SYSDIV_10); // The frequency division result is 20MHz
*/

    LED_Init(LED1); // Initialize LED1 and LED2
    LED_On(LED1); // Turn on LED1

    GPIOD_IntInit(); // GPIOD interrupt initialization
    GPIOG_IntInit(); // GPIOG interrupt initialization

    IntMasterEnable(); // Enable processor interrupts (turn on global interrupts)
}

// Main function (program entry)
int main(void)
{
    JTAG_Wait(); // Prevent JTAG failure, important!

    SystemInit(); // System initialization

    for (;;)
    {
    }
}

// GPIOD interrupt service function
void GPIO_Port_D_ISR(void)
{
    unsigned long ulStatus;

    ulStatus = GPIOPinIntStatus(GPIO_PORTD_BASE , true); // Read interrupt status
    GPIOPinIntClear(GPIO_PORTD_BASE , ulStatus); // Clear interrupt status, important (must be cleared by software)

    if ( ulStatus & GPIO_PIN_1 ) // If the interrupt status of PD1 is valid
    {
        LED_On(LED1); // Turn on LED1
    }

    // If there are interrupts from other pins of the GPIOD port to be processed, please add multiple if statements in parallel
}

//GPIOG interrupt service function
void GPIO_Port_G_ISR(void)
{
    unsigned long ulStatus;

    ulStatus = GPIOPinIntStatus(GPIO_PORTG_BASE, true); // Read interrupt status
    GPIOPinIntClear(GPIO_PORTG_BASE, ulStatus); // Clear interrupt status, important

    if ( ulStatus & GPIO_PIN_5 ) // If the interrupt status of PG5 is valid
    {
        LED_Off(LED1); // Turn off LED1
    }

    // If there are interrupts from other pins of the GPIOG port to be processed, please parallelize multiple if statements
}