C++ ROM_IntEnable函数代码示例

//*****************************************************************************
//
//! Initializes the sound output.
//!
//! This function prepares the sound driver to play songs or sound effects.  It
//! must be called before any other sound function.  The sound driver uses
//! uDMA and the caller must ensure that the uDMA peripheral is enabled and
//! its control table configured prior to making this call.
//!
//! \return None
//
//*****************************************************************************
void
SoundInit(void)
{
    //
    // Set the current active buffer to zero.
    //
    g_ulPlaying = 0;

    //
    // Enable and reset the peripheral.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_I2S0);

    //
    // Select alternate functions for all of the I2S pins.
    //
    ROM_SysCtlPeripheralEnable(I2S0_SCLKTX_PERIPH);
    GPIOPinTypeI2S(I2S0_SCLKTX_PORT, I2S0_SCLKTX_PIN);

    ROM_SysCtlPeripheralEnable(I2S0_LRCTX_PERIPH);
    GPIOPinTypeI2S(I2S0_LRCTX_PORT, I2S0_LRCTX_PIN);

    ROM_SysCtlPeripheralEnable(I2S0_SDATX_PERIPH);
    GPIOPinTypeI2S(I2S0_SDATX_PORT, I2S0_SDATX_PIN);

    ROM_SysCtlPeripheralEnable(I2S0_MCLKTX_PERIPH);
    GPIOPinTypeI2S(I2S0_MCLKTX_PORT, I2S0_MCLKTX_PIN);

    //
    // Initialize the DAC.
    //
    WM8510Init();

    //
    // Set the intial volume level
    //
    WM8510VolumeSet(g_ucVolume);

    //
    // Set the FIFO trigger limit
    //
    I2STxFIFOLimitSet(I2S0_BASE, 4);

    //
    // Clear out all pending interrupts.
    //
    I2SIntClear(I2S0_BASE, I2S_INT_TXERR | I2S_INT_TXREQ );

    //
    // Enable the I2S interrupt on the NVIC
    //
    ROM_IntEnable(INT_I2S0);

    //
    // Disable all uDMA attributes.
    //
    ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_I2S0TX, UDMA_ATTR_ALL);
}

void timerInit()
{

#if F_CPU >= 80000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 50000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_4|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 40000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 25000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_8|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 16200000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_1|SYSCTL_USE_OSC|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);	//NOT PLL
#elif F_CPU >= 16100000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_1|SYSCTL_USE_OSC|SYSCTL_OSC_INT|
                SYSCTL_OSC_MAIN);	//NOT PLL, INT OSC
#elif F_CPU >= 16000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_12_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 10000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_20|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#elif F_CPU >= 8000000
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_25|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#else
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
                SYSCTL_OSC_MAIN);
#endif

    //
    //  SysTick is used for delay() and delayMicroseconds()
    //
//	ROM_SysTickPeriodSet(0x00FFFFFF);
    ROM_SysTickPeriodSet(ROM_SysCtlClockGet() / TICKS_PER_SECOND);
    ROM_SysTickEnable();

    //
    //Initialize Timer5 to be used as time-tracker since beginning of time
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER5); //not tied to launchpad pin
    ROM_TimerConfigure(TIMER5_BASE, TIMER_CFG_PERIODIC_UP);

    ROM_TimerLoadSet(TIMER5_BASE, TIMER_A, ROM_SysCtlClockGet()/1000);

    ROM_IntEnable(INT_TIMER5A);
    ROM_TimerIntEnable(TIMER5_BASE, TIMER_TIMA_TIMEOUT);

    ROM_TimerEnable(TIMER5_BASE, TIMER_A);

    ROM_IntMasterEnable();

}

//*****************************************************************************
//
// Initializes the uDMA software channel to perform a memory to memory uDMA
// transfer.
//
//*****************************************************************************
void
InitSWTransfer(void)
{
    unsigned int uIdx;

    //
    // Fill the source memory buffer with a simple incrementing pattern.
    //
    for(uIdx = 0; uIdx < MEM_BUFFER_SIZE; uIdx++)
    {
        g_ulSrcBuf[uIdx] = uIdx;
    }

    //
    // Enable interrupts from the uDMA software channel.
    //
    ROM_IntEnable(INT_UDMA);

    //
    // Put the attributes in a known state for the uDMA software channel.
    // These should already be disabled by default.
    //
    ROM_uDMAChannelAttributeDisable(UDMA_CHANNEL_SW,
                                    UDMA_ATTR_USEBURST | UDMA_ATTR_ALTSELECT |
                                    (UDMA_ATTR_HIGH_PRIORITY |
                                    UDMA_ATTR_REQMASK));

    //
    // Configure the control parameters for the SW channel.  The SW channel
    // will be used to transfer between two memory buffers, 32 bits at a time.
    // Therefore the data size is 32 bits, and the address increment is 32 bits
    // for both source and destination.  The arbitration size will be set to 8,
    // which causes the uDMA controller to rearbitrate after 8 items are
    // transferred.  This keeps this channel from hogging the uDMA controller
    // once the transfer is started, and allows other channels cycles if they
    // are higher priority.
    //
    ROM_uDMAChannelControlSet(UDMA_CHANNEL_SW | UDMA_PRI_SELECT,
                              UDMA_SIZE_32 | UDMA_SRC_INC_32 | UDMA_DST_INC_32 |
                              UDMA_ARB_8);

    //
    // Set up the transfer parameters for the software channel.  This will
    // configure the transfer buffers and the transfer size.  Auto mode must be
    // used for software transfers.
    //
    ROM_uDMAChannelTransferSet(UDMA_CHANNEL_SW | UDMA_PRI_SELECT,
                               UDMA_MODE_AUTO, g_ulSrcBuf, g_ulDstBuf,
                               MEM_BUFFER_SIZE);

    //
    // Now the software channel is primed to start a transfer.  The channel
    // must be enabled.  For software based transfers, a request must be
    // issued.  After this, the uDMA memory transfer begins.
    //
    ROM_uDMAChannelEnable(UDMA_CHANNEL_SW);
    ROM_uDMAChannelRequest(UDMA_CHANNEL_SW);
}

// Start the timers and interrupt frequency
void servoStart(void) {
    ROM_SysCtlPeripheralEnable(SERVO_TIMER_PERIPH);
    ROM_IntMasterEnable();
    ROM_TimerConfigure(SERVO_TIMER, TIMER_CFG_PERIODIC);
    ROM_TimerLoadSet(SERVO_TIMER, SERVO_TIMER_A, (ROM_SysCtlClockGet() / 1000000) * SERVO_TIMER_RESOLUTION);
    ROM_IntEnable(SERVO_TIMER_INTERRUPT);
    ROM_TimerIntEnable(SERVO_TIMER, SERVO_TIMER_TRIGGER);
    ROM_TimerEnable(SERVO_TIMER, SERVO_TIMER_A);
}

// * svm_int_init *************************************************************
// * setup counter reload interrupt from pwm generator for svm                *
// * Assumes system clock already configured                                  *
// ****************************************************************************
void svm_int_init(void)
{
  ROM_IntMasterEnable();                                    // enable NVIC interrupts
  ROM_PWMIntEnable(SVM_PWM_BASE, SVM_PWM_INT_GEN);          // enable interrupt assertion from our specific generator in module
  ROM_PWMGenIntTrigEnable(SVM_PWM_BASE, SVM_PWM_GEN, PWM_INT_CNT_LOAD);
                                                            // enable counter load interrupt from our generator
  ROM_IntEnable(SVM_PWM_GEN_INTVECT);                       // enable NVIC vector for our generator
                                                            // load interrupt for our generator is now active
}

//*****************************************************************************
//
// PoC2Repeater
//
//*****************************************************************************
int
main(void)
{
    // Set the clocking to run directly from the crystal at 120MHz.
    g_ui32SysClock = MAP_SysCtlClockFreqSet((SYSCTL_XTAL_25MHZ |
                                             SYSCTL_OSC_MAIN |
                                             SYSCTL_USE_PLL |
                                             SYSCTL_CFG_VCO_480), 120000000);

    // Enable the peripherals
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART7);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOC);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOJ);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);


    // Enable the GPIO pins for the LEDs (PN0 and PN1).
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0);
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_1);
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_0);
    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTF_BASE, GPIO_PIN_4);


	// ButtonsInit
    ROM_GPIODirModeSet(GPIO_PORTJ_BASE, ALL_BUTTONS, GPIO_DIR_MODE_IN);
    MAP_GPIOPadConfigSet(GPIO_PORTJ_BASE, ALL_BUTTONS,
                         GPIO_STRENGTH_2MA, GPIO_PIN_TYPE_STD_WPU);	

    // Enable processor interrupts.
    ROM_IntMasterEnable();

    // Set GPIO PC4 and PC5 as UART pins.
    GPIOPinConfigure(GPIO_PC4_U7RX);
    GPIOPinConfigure(GPIO_PC5_U7TX);
    ROM_GPIOPinTypeUART(GPIO_PORTC_BASE, GPIO_PIN_4 | GPIO_PIN_5);

    // Configure the UART for 115,200, 8-N-1 operation.
    ROM_UARTConfigSetExpClk(UART7_BASE, g_ui32SysClock, 115200,
                            (UART_CONFIG_WLEN_8 |
                             UART_CONFIG_STOP_ONE |
                             UART_CONFIG_PAR_NONE));

    // Enable the UART interrupt.
    ROM_IntEnable(INT_UART7);
    ROM_UARTIntEnable(UART7_BASE, UART_INT_RX | UART_INT_RT);
    
    // Reset message info
    for(uint8_t i = 0; i < MSG; i++)
    	message[i] = 0;

    // Loop forever echoing data through the UART.
    while(1)
    {
    }
}

void initializeTimer(void)
{
    timerSeconds = 0;
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
    ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
    // invoke timer once a second
    ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, ROM_SysCtlClockGet());
    ROM_IntEnable(INT_TIMER0A);
    ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
    ROM_TimerEnable(TIMER0_BASE, TIMER_A);
}

//*****************************************************************************
//
//! Initializes the sound driver.
//!
//! \param ui32SysClock is the frequency of the system clock.
//!
//! This function initializes the sound driver, preparing it to output sound
//! data to the speaker.
//!
//! The system clock should be as high as possible; lower clock rates reduces
//! the quality of the produced sound.  For the best quality sound, the system
//! should be clocked at 120 MHz.
//!
//! \note In order for the sound driver to function properly, the sound driver
//! interrupt handler (SoundIntHandler()) must be installed into the vector
//! table for the timer 5 subtimer A interrupt.
//!
//! \return None.
//
//*****************************************************************************
void
SoundInit(uint32_t ui32SysClock)
{
    //
    // Enable the peripherals used by the sound driver.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER5);

    //
    // Compute the PWM period based on the system clock.
    //
    g_sSoundState.ui32Period = ui32SysClock / 64000;

    //
    // Set the default volume.
    //
    g_sSoundState.i32Volume = 255;

    //
    // Configure the timer to run in PWM mode.
    //
    if((HWREG(TIMER5_BASE + TIMER_O_CTL) & TIMER_CTL_TBEN) == 0)
    {
        ROM_TimerConfigure(TIMER5_BASE, (TIMER_CFG_SPLIT_PAIR |
                                         TIMER_CFG_A_PWM |
                                         TIMER_CFG_B_PERIODIC));
    }
    ROM_TimerLoadSet(TIMER5_BASE, TIMER_A, g_sSoundState.ui32Period - 1);
    ROM_TimerMatchSet(TIMER5_BASE, TIMER_A, g_sSoundState.ui32Period);
    ROM_TimerControlLevel(TIMER5_BASE, TIMER_A, true);

    //
    // Update the timer values on timeouts and not immediately.
    //
    TimerUpdateMode(TIMER5_BASE, TIMER_A, TIMER_UP_LOAD_TIMEOUT |
                                          TIMER_UP_MATCH_TIMEOUT);

    //
    // Configure the timer to generate an interrupt at every time-out event.
    //
    ROM_TimerIntEnable(TIMER5_BASE, TIMER_CAPA_EVENT);

    //
    // Enable the timer.  At this point, the timer generates an interrupt
    // every 15.625 us.
    //
    ROM_TimerEnable(TIMER5_BASE, TIMER_A);
    ROM_IntEnable(INT_TIMER5A);

    //
    // Clear the sound flags.
    //
    g_sSoundState.ui32Flags = 0;
}

//*****************************************************************************
//
//! Initializes the Timer and GPIO functionality associated with the RGB LED
//!
//! \param ui32Enable enables RGB immediately if set.
//!
//! This function must be called during application initialization to
//! configure the GPIO pins to which the LEDs are attached.  It enables
//! the port used by the LEDs and configures each color's Timer. It optionally
//! enables the RGB LED by configuring the GPIO pins and starting the timers.
//!
//! \return None.
//
//*****************************************************************************
void
RGBInit(uint32_t ui32Enable)
{
    //
    // Enable the GPIO Port and Timer for each LED
    //
    ROM_SysCtlPeripheralEnable(RED_GPIO_PERIPH);
    ROM_SysCtlPeripheralEnable(RED_TIMER_PERIPH);

    ROM_SysCtlPeripheralEnable(GREEN_GPIO_PERIPH);
    ROM_SysCtlPeripheralEnable(GREEN_TIMER_PERIPH);

    ROM_SysCtlPeripheralEnable(BLUE_GPIO_PERIPH);
    ROM_SysCtlPeripheralEnable(BLUE_TIMER_PERIPH);

    //
    // Configure each timer for output mode
    //
    HWREG(GREEN_TIMER_BASE + TIMER_O_CFG)   = 0x04;
    HWREG(GREEN_TIMER_BASE + TIMER_O_TAMR)  = 0x0A;
    HWREG(GREEN_TIMER_BASE + TIMER_O_TAILR) = 0xFFFF;

    HWREG(BLUE_TIMER_BASE + TIMER_O_CFG)   = 0x04;
    HWREG(BLUE_TIMER_BASE + TIMER_O_TBMR)  = 0x0A;
    HWREG(BLUE_TIMER_BASE + TIMER_O_TBILR) = 0xFFFF;

    HWREG(RED_TIMER_BASE + TIMER_O_CFG)   = 0x04;
    HWREG(RED_TIMER_BASE + TIMER_O_TBMR)  = 0x0A;
    HWREG(RED_TIMER_BASE + TIMER_O_TBILR) = 0xFFFF;

    //
    // Invert the output signals.
    //
    HWREG(RED_TIMER_BASE + TIMER_O_CTL)   |= 0x4000;
    HWREG(GREEN_TIMER_BASE + TIMER_O_CTL)   |= 0x40;
    HWREG(BLUE_TIMER_BASE + TIMER_O_CTL)   |= 0x4000;

    if(ui32Enable)
    {
        RGBEnable();
    }

    //
    // Setup the blink functionality
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_WTIMER5);
    ROM_TimerConfigure(WTIMER5_BASE, TIMER_CFG_B_PERIODIC | TIMER_CFG_SPLIT_PAIR);
    ROM_TimerLoadSet64(WTIMER5_BASE, 0xFFFFFFFFFFFFFFFF);
    ROM_IntEnable(INT_WTIMER5B);
    ROM_TimerIntEnable(WTIMER5_BASE, TIMER_TIMB_TIMEOUT);


}

void setup()
{
	//--------------------- GENERAL ---------------------

    // Enable lazy stacking for interrupt handlers.  This allows floating-point
    // instructions to be used within interrupt handlers, but at the expense of
    // extra stack usage.
    ROM_FPUEnable();
    ROM_FPULazyStackingEnable();

    // Set the clocking to run directly from the crystal.
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                       SYSCTL_XTAL_16MHZ);

    ROM_IntMasterEnable();

    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    ROM_GPIOPinTypeGPIOOutput(GPIO_PORTA_BASE, GPIO_PIN_6);

	//--------------------- UART ---------------------

    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);

    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);
    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

    // Configure the UART for 115,200, 8-N-1 operation.
    ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,
                            (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE | UART_CONFIG_PAR_NONE));

    // Enable the UART interrupt.
    ROM_IntEnable(INT_UART0);
    ROM_UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);


	//--------------------- SSI ---------------------

    SysCtlPeripheralEnable(SYSCTL_PERIPH_SSI0);

    GPIOPinConfigure(GPIO_PA2_SSI0CLK);
    GPIOPinConfigure(GPIO_PA3_SSI0FSS);
    GPIOPinConfigure(GPIO_PA4_SSI0RX);
    GPIOPinConfigure(GPIO_PA5_SSI0TX);

    GPIOPinTypeSSI(GPIO_PORTA_BASE, GPIO_PIN_5 | GPIO_PIN_4 | GPIO_PIN_3 | GPIO_PIN_2);

    SSIConfigSetExpClk(SSI0_BASE, SysCtlClockGet(), SSI_FRF_MOTO_MODE_0, SSI_MODE_MASTER, 10000, 8);

    SSIEnable(SSI0_BASE);

}

ServoClass::ServoClass()
{
	ROM_SysCtlClockSet(SYSCTL_SYSDIV_2_5|SYSCTL_USE_PLL|SYSCTL_XTAL_16MHZ|
	                SYSCTL_OSC_MAIN);

	// Initialize variables of the class

	g_ulPeriod = 0;

	for(int il_iter = 0; il_iter < SERVOS_PER_TIMER; il_iter++)
	{
		g_ulServoPins[il_iter] = INVALID_SERVO_PIN;
		g_ulServoPulse[il_iter] = DEFAULT_SERVO_PULSE_WIDTH;
	}

	g_iServoNo = 0;
	g_ulPulseWidth = 0;
	g_ulTicksPerMicrosecond = 0;

	setRefresh();

	//	for(int il_iter = 0; il_iter < SERVOS_PER_TIMER; il_iter++)
	//	{
	//		if (g_ulServoPins[il_iter] != INVALID_SERVO_PIN)
	//		{
	//			pinMode(g_ulServoPins[il_iter], OUTPUT);
	//			digitalWrite(g_ulServoPins[il_iter], LOW);
	//		}
	//	}

	// Enable TIMER
	ROM_SysCtlPeripheralEnable(SERVO_TIMER_PERIPH);

	// Enable processor interrupts.
	ROM_IntMasterEnable();

	// Configure the TIMER
	ROM_TimerConfigure(SERVO_TIMER, SERVO_TIME_CFG);

	// Calculate the number of timer counts/microsecond
	g_ulTicksPerMicrosecond = ROM_SysCtlClockGet() / 1000000;
	g_ulPeriod = g_ulTicksPerMicrosecond * REFRESH_INTERVAL;   // 20ms = Standard Servo refresh delay

	// Initially load the timer with 20ms interval time
	ROM_TimerLoadSet(SERVO_TIMER, SERVO_TIMER_A, g_ulPeriod);

	// Setup the interrupt for the TIMER1A timeout.
	ROM_IntEnable(SERVO_TIMER_INTERRUPT);
	ROM_TimerIntEnable(SERVO_TIMER, SERVO_TIMER_TRIGGER);

	// Enable the timer.
	ROM_TimerEnable(SERVO_TIMER, SERVO_TIMER_A);
}

//*****************************************************************************
//
//! Initializes the touch screen driver.
//!
//! \param ui32SysClock is the frequency of the system clock.
//!
//! This function initializes the touch screen driver, beginning the process of
//! reading from the touch screen.  This driver uses the following hardware
//! resources:
//!
//! - ADC 0 sample sequence 3
//! - Timer 5 subtimer B
//!
//! \return None.
//
//*****************************************************************************
void
TouchScreenInit(uint32_t ui32SysClock)
{
    //
    // Set the initial state of the touch screen driver's state machine.
    //
    g_ui32TSState = TS_STATE_INIT;

    //
    // There is no touch screen handler initially.
    //
    g_pfnTSHandler = 0;

    //
    // Enable the peripherals used by the touch screen interface.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER5);

    //
    // Configure the ADC sample sequence used to read the touch screen reading.
    //
    ROM_ADCHardwareOversampleConfigure(ADC0_BASE, 4);
    ROM_ADCSequenceConfigure(ADC0_BASE, 3, ADC_TRIGGER_TIMER, 0);
    ROM_ADCSequenceStepConfigure(ADC0_BASE, 3, 0,
                                 TS_YP_ADC | ADC_CTL_END | ADC_CTL_IE);
    ROM_ADCSequenceEnable(ADC0_BASE, 3);

    //
    // Enable the ADC sample sequence interrupt.
    //
    ROM_ADCIntEnable(ADC0_BASE, 3);
    ROM_IntEnable(INT_ADC0SS3);

    //
    // Configure the timer to trigger the sampling of the touch screen
    // every 2.5 milliseconds.
    //
    if((HWREG(TIMER5_BASE + TIMER_O_CTL) & TIMER_CTL_TAEN) == 0) {
        ROM_TimerConfigure(TIMER5_BASE, (TIMER_CFG_SPLIT_PAIR |
                                         TIMER_CFG_A_PWM |
                                         TIMER_CFG_B_PERIODIC));
    }
    ROM_TimerPrescaleSet(TIMER5_BASE, TIMER_B, 255);
    ROM_TimerLoadSet(TIMER5_BASE, TIMER_B, ((ui32SysClock / 256) / 400) - 1);
    TimerControlTrigger(TIMER5_BASE, TIMER_B, true);

    //
    // Enable the timer.  At this point, the touch screen state machine will
    // sample and run every 2.5 ms.
    //
    ROM_TimerEnable(TIMER5_BASE, TIMER_B);
}

//*****************************************************************************
//
// This function prepares the watchdog timer to detect the lost of the input
// link.
//
//*****************************************************************************
void
WatchdogInit(void)
{
    //
    // Configure the watchdog timer to interrupt if it is not pet frequently
    // enough.
    //
    ROM_WatchdogReloadSet(WATCHDOG0_BASE, WATCHDOG_PERIOD);
    ROM_WatchdogStallEnable(WATCHDOG0_BASE);
    ROM_WatchdogEnable(WATCHDOG0_BASE);
    ROM_IntEnable(INT_WATCHDOG);
}

//*****************************************************************************
//
// This example demonstrates how to send a string of data to the UART.
//
//*****************************************************************************
int
main(void)
{
    //
    // Set the clocking to run directly from the crystal.
    //
    ROM_SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN |
                       SYSCTL_XTAL_16MHZ);

    //
    // Enable the peripherals used by this example.
    //
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_UART0);
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOA);

    //
    // Enable processor interrupts.
    //
    ROM_IntMasterEnable();

    //
    // Set GPIO A0 and A1 as UART pins.
    //
    GPIOPinConfigure(GPIO_PA0_U0RX);
    GPIOPinConfigure(GPIO_PA1_U0TX);
    ROM_GPIOPinTypeUART(GPIO_PORTA_BASE, GPIO_PIN_0 | GPIO_PIN_1);

    //
    // Configure the UART for 115,200, 8-N-1 operation.
    //
    ROM_UARTConfigSetExpClk(UART0_BASE, ROM_SysCtlClockGet(), 115200,
                            (UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |
                             UART_CONFIG_PAR_NONE));

    //
    // Enable the UART interrupt.
    //
    ROM_IntEnable(INT_UART0);
    ROM_UARTIntEnable(UART0_BASE, UART_INT_RX | UART_INT_RT);

    //
    // Prompt for text to be entered.
    //
    UARTSend((unsigned char *)"\033[2JEnter text: ", 16);

    //
    // Loop forever echoing data through the UART.
    //
    while(1)
    {
    }
}

//函数创建区
//----------------------------------------Start-------------------------------------------
void Init_Timer()
{
    ROM_SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);

    ROM_TimerConfigure(TIMER0_BASE, TIMER_CFG_PERIODIC);
    ROM_TimerLoadSet(TIMER0_BASE, TIMER_A, ROM_SysCtlClockGet()/100);//10ms周期中断,由100决定 如果为1为1s定时
    GPIOIntRegister(INT_TIMER0A, Timer0AIntHandler);
    ROM_IntEnable(INT_TIMER0A);
    ROM_TimerIntEnable(TIMER0_BASE, TIMER_TIMA_TIMEOUT);
    ROM_TimerEnable(TIMER0_BASE, TIMER_A);
    ROM_IntMasterEnable();

}