C++ CMU_ClockEnable函数代码示例

/**************************************************************************//**
 * @brief Configure SPI for correct peripheral
 *
 * @param[in] device
 *    Device to enable SPI bus for
 *****************************************************************************/
void DVK_spiControl(DVK_SpiControl_TypeDef device)
{
  switch (device)
  {
  case DVK_SPI_Audio:
    DVK_writeRegister(&BC_REGISTER->SPI_DEMUX, BC_SPI_DEMUX_SLAVE_AUDIO);
    break;

  case DVK_SPI_Ethernet:
    DVK_writeRegister(&BC_REGISTER->SPI_DEMUX, BC_SPI_DEMUX_SLAVE_ETHERNET);
    break;

  case DVK_SPI_Display:
    DVK_writeRegister(&BC_REGISTER->SPI_DEMUX, BC_SPI_DEMUX_SLAVE_DISPLAY);
    break;

  case DVK_SPI_OFF:
    USART_Reset(USART1);
    CMU_ClockEnable(cmuClock_USART1, false);
    break;
  }
}

/***************************************************************************//**
 * @brief
 *  Start the TIMER1 to generate a 50% duty cycle output.
 *
 * @param[in] frequency
 *  The output frequency in Hz.
 ******************************************************************************/
void TD_TIMER_Start(uint32_t frequency)
{
	uint32_t top;

	top = CMU_ClockFreqGet(cmuClock_TIMER1);
	top = top / frequency;

	// Enable clock for TIMER1 module
	CMU_ClockEnable(cmuClock_TIMER1, true);

	// Configure CC channel 0
	TIMER_InitCC(TIMER1, 0, &timerCCInit);

	// Route CC0 to location 0 (PC13) and enable pin
	//TIMER1->ROUTE |= (TIMER_ROUTE_CC0PEN | TIMER_ROUTE_LOCATION_LOC0);

	// Set Top Value
	TIMER_TopSet(TIMER1, top);

	// Set compare value starting at 0 - it will be incremented in the interrupt handler
	TIMER_CompareBufSet(TIMER1, 0, top >> 1);

	// Configure timer
	TIMER_Init(TIMER1, &timerInit);

	// Enable overflow interrupt
	TIMER_IntEnable(TIMER1, TIMER_IF_OF);

	// Disable interrupts
	//TIMER_IntDisable(TIMER1, TIMER_IF_OF);

	// Enable TIMER1 interrupt vector in NVIC
	NVIC_EnableIRQ(TIMER1_IRQn);

	// Enable timer
	TIMER_Enable(TIMER1, true);
	TD_TIMER_Enabled = true;
}

/******************************************************************************
* @brief  uartSetup function
*
******************************************************************************/
void uartSetup(void)
{
  /* Enable clock for GPIO module (required for pin configuration) */
  CMU_ClockEnable(cmuClock_GPIO, true);
  /* Configure GPIO pins */
  GPIO_PinModeSet(gpioPortB, 9, gpioModePushPull, 1);
  GPIO_PinModeSet(gpioPortB, 10, gpioModeInput, 0);


  /* Prepare struct for initializing UART in asynchronous mode*/
  uartInit.enable       = usartDisable;   /* Don't enable UART upon intialization */
  uartInit.refFreq      = 0;              /* Provide information on reference frequency. When set to 0, the reference frequency is */
  uartInit.baudrate     = 115200;         /* Baud rate */
  uartInit.oversampling = usartOVS16;     /* Oversampling. Range is 4x, 6x, 8x or 16x */
  uartInit.databits     = usartDatabits8; /* Number of data bits. Range is 4 to 10 */
  uartInit.parity       = usartNoParity;  /* Parity mode */
  uartInit.stopbits     = usartStopbits1; /* Number of stop bits. Range is 0 to 2 */
  uartInit.mvdis        = false;          /* Disable majority voting */
  uartInit.prsRxEnable  = false;          /* Enable USART Rx via Peripheral Reflex System */
  uartInit.prsRxCh      = usartPrsRxCh0;  /* Select PRS channel if enabled */

  /* Initialize USART with uartInit struct */
  USART_InitAsync(uart, &uartInit);

  /* Prepare UART Rx and Tx interrupts */
  USART_IntClear(uart, _UART_IF_MASK);
  USART_IntEnable(uart, UART_IF_RXDATAV);
  NVIC_ClearPendingIRQ(UART1_RX_IRQn);
  NVIC_ClearPendingIRQ(UART1_TX_IRQn);
  NVIC_EnableIRQ(UART1_RX_IRQn);
  NVIC_EnableIRQ(UART1_TX_IRQn);

  /* Enable I/O pins at UART1 location #2 */
  uart->ROUTE = UART_ROUTE_RXPEN | UART_ROUTE_TXPEN | UART_ROUTE_LOCATION_LOC2;

  /* Enable UART */
  USART_Enable(uart, usartEnable);
}

void gpioSetup(){

	/* Enable GPIO in CMU */
	CMU_ClockEnable(cmuClock_GPIO, true);

	/* Configure PC0 as Output */
	GPIO_PinModeSet(gpioPortC, 0, gpioModePushPull, 0);

	/* Configure PD0 as input */
	GPIO_PinModeSet(gpioPortB, 9, gpioModeInput, 0);

	/* Set rising edge interrupt for both ports */
	GPIO_IntConfig(gpioPortB, 9, true, false, true);

	motor_gpioSetup(); //set up the output pins for the step motor

	/* Enable interrupt in core for even and odd gpio interrupts */
	NVIC_ClearPendingIRQ(GPIO_EVEN_IRQn);
	NVIC_EnableIRQ(GPIO_EVEN_IRQn);

	/* Set PC0 to 0 */
	GPIO_PinOutSet(gpioPortC, 0);
}

/**************************************************************************//**
 * @brief Initialize TIMER0 in Up Count mode and to give interrupt on overflow
 *****************************************************************************/
void initTimer()
{  
  TIMER_Init_TypeDef initValues = TIMER_INIT_DEFAULT;
  
  /* Enable clock for TIMER0 */
  CMU_ClockEnable(cmuClock_TIMER0, true);
  
  /* Enable overflow interrupt for TIMER0*/
  TIMER_IntEnable(TIMER0, TIMER_IF_OF);
  
  /* Enable TIMER0 interrupt vector in NVIC */
  NVIC_EnableIRQ(TIMER0_IRQn);
  
  /* Set TIMER0 Top value */
  TIMER_TopSet(TIMER0, TOP);
  
  /* Initialize TIMER0 in with 1024x prescaling */
  initValues.prescale = timerPrescale1024;
  TIMER_Init(TIMER0, &initValues);
  
  /* Start TIMER0 */
  TIMER0->CMD = TIMER_CMD_START;
}

void i2c_setup()
{
	CMU_ClockEnable(cmuClock_I2C0, true);

	I2C_Init_TypeDef init = I2C_INIT_DEFAULT;

	init.enable                    = 1;
	init.master                    = 1;
	init.freq                      = I2C_FREQ_STANDARD_MAX;
	init.clhr                      = i2cClockHLRStandard;
	I2C_Init(I2C0, &init);

	// The rest of this is cut-and-pasted from chapter 10's InitDevice.c file
	/* Module I2C0 is configured to location 1 */
	I2C0->ROUTE = (I2C0->ROUTE & ~_I2C_ROUTE_LOCATION_MASK) | I2C_ROUTE_LOCATION_LOC1;

	/* Enable signals SCL, SDA */
	I2C0->ROUTE |= I2C_ROUTE_SCLPEN | I2C_ROUTE_SDAPEN;

	/* Module PCNT0 is configured to location 1 */
	PCNT0->ROUTE = (PCNT0->ROUTE & ~_PCNT_ROUTE_LOCATION_MASK) | PCNT_ROUTE_LOCATION_LOC1;

	/* Module USART1 is configured to location 1 */
	USART1->ROUTE = (USART1->ROUTE & ~_USART_ROUTE_LOCATION_MASK) | USART_ROUTE_LOCATION_LOC1;

	/* Enable signals RX, TX */
	USART1->ROUTE |= USART_ROUTE_RXPEN | USART_ROUTE_TXPEN;
	// [Route Configuration]$


	/* Pin PD6 is configured to Open-drain with pull-up and filter */
	GPIO->P[3].MODEL = (GPIO->P[3].MODEL & ~_GPIO_P_MODEL_MODE6_MASK) | GPIO_P_MODEL_MODE6_WIREDANDPULLUPFILTER;

	/* Pin PD7 is configured to Open-drain with pull-up and filter */
	GPIO->P[3].MODEL = (GPIO->P[3].MODEL & ~_GPIO_P_MODEL_MODE7_MASK) | GPIO_P_MODEL_MODE7_WIREDANDPULLUPFILTER;
	// [Port D Configuration]$
}

/**************************************************************************//**
 * @brief Setup GPIO interrupt to set the time
 *****************************************************************************/
void gpioSetup(void)
{
  /* Configure PD8 as input */
	//GPIO_PinModeSet(gpioPortD, 8, gpioModeInput, 0);

  /* Set falling edge interrupt */
  //GPIO_IntConfig(gpioPortD, 8, false, true, true);
  //NVIC_ClearPendingIRQ(GPIO_EVEN_IRQn);
  //NVIC_EnableIRQ(GPIO_EVEN_IRQn);

  /* Configure PB11 as input */
  //GPIO_PinModeSet(gpioPortB, 11, gpioModeInput, 0);

  /* Set falling edge interrupt */
  //GPIO_IntConfig(gpioPortB, 11, false, true, true);
  //NVIC_ClearPendingIRQ(GPIO_ODD_IRQn);
  //NVIC_EnableIRQ(GPIO_ODD_IRQn);


  /* Enable GPIO in CMU */
  CMU_ClockEnable(cmuClock_GPIO, true);

  /* Configure PD8 and PB11 as input */
  GPIO_PinModeSet(gpioPortD, 8, gpioModeInput, 0);
  GPIO_PinModeSet(gpioPortB, 11, gpioModeInput, 0);

  /* Set falling edge interrupt for both ports */
  GPIO_IntConfig(gpioPortD, 8, false, true, true);
  GPIO_IntConfig(gpioPortB, 11, false, true, true);

  /* Enable interrupt in core for even and odd gpio interrupts */
  NVIC_ClearPendingIRQ(GPIO_EVEN_IRQn);
  NVIC_EnableIRQ(GPIO_EVEN_IRQn);

  NVIC_ClearPendingIRQ(GPIO_ODD_IRQn);
  NVIC_EnableIRQ(GPIO_ODD_IRQn);
}

/***************************************************************************//**
 * @brief
 *	Initialize touch panel driver
 *
 * @param config
 *	Driver configuration data.
 ******************************************************************************/
void TOUCH_Init(TOUCH_Config_TypeDef *config)
{
  ADC_Init_TypeDef init = ADC_INIT_DEFAULT;
#ifndef TOUCH_WITHOUT_STORE
  touch_LoadCalibration();
#endif
  CMU_ClockEnable(cmuClock_ADC0, true);
  ADC_IntDisable(ADC0, _ADC_IF_MASK);
  init.prescale     = ADC_PrescaleCalc(config->frequency, 0);
  touch_ignore_move = config->ignore;
  init.ovsRateSel   = config->oversampling;
  ADC_Init(ADC0, &init);
  BSP_PeripheralAccess(BSP_TOUCH, true);
  sInit.input      = ADC_Y;
  sInit.reference  = adcRefVDD;
  sInit.resolution = adcResOVS;
  ADC_InitSingle(ADC0, &sInit);
  ADC_IntClear(ADC0, _ADC_IF_MASK);
  touch_state = TOUCH_INIT;
  NVIC_ClearPendingIRQ(ADC0_IRQn);
  NVIC_EnableIRQ(ADC0_IRQn);
  ADC_IntEnable(ADC0, ADC_IF_SINGLE);
  ADC_Start(ADC0, adcStartSingle);
}

int main(void)
{ 
    CHIP_Init();
  
    /*Turn on the DAC clock.*/
    CMU_ClockEnable(cmuClock_DAC0, true);
    
    /*configure and enable the DAC.*/
    DAC_setup();
    DAC_Enable(DAC0, 0, true);
    
    /*Write data to registers. V1 = 1.0*/
    DAC0->CH0DATA = (uint32_t)((1.0 * 4096) / 3.3);
    
    /*configure OPA0, OPA1 and OPA2.*/
    OPAMP_Init_TypeDef configuration0 =  OPA_INIT_DIFF_RECEIVER_OPA0 ;
    OPAMP_Init_TypeDef configuration2 =  OPA_INIT_DIFF_RECEIVER_OPA2 ; 
    
    /*Redefine the resistances. Want to divide the difference by 3.*/
    configuration2.resSel = opaResSelDefault;
    configuration0.resSel = opaResSelR2eq3R1;
    
    /*OPA2 positive input = VSS*/
    configuration2.resInMux = opaResInMuxVss;
    
    /*Enable OPA0 and OPA2. All the configurations are set.*/
    OPAMP_Enable(DAC0, OPA0, &configuration0);
    OPAMP_Enable(DAC0, OPA2, &configuration2);

    /*Disable OPA0. This is done because we want to use OPA0 as a part of the DAC. 
    The configurations set above are still there.*/
    DAC0->OPACTRL &= ~DAC_OPACTRL_OPA0EN;
  
    /*Never end.*/
    while(1);   
}

void us_ticker_init(void)
{
    if (us_ticker_inited) {
        /* calling init again should cancel current interrupt */
        us_ticker_disable_interrupt();
        return;
    }
    us_ticker_inited = true;

    /* Enable clock for TIMERs */
    CMU_ClockEnable(US_TICKER_TIMER_CLOCK, true);

    if (REFERENCE_FREQUENCY > 24000000) {
        US_TICKER_TIMER->CTRL = (US_TICKER_TIMER->CTRL & ~_TIMER_CTRL_PRESC_MASK) | (4 << _TIMER_CTRL_PRESC_SHIFT);
    } else {
        US_TICKER_TIMER->CTRL = (US_TICKER_TIMER->CTRL & ~_TIMER_CTRL_PRESC_MASK) | (3 << _TIMER_CTRL_PRESC_SHIFT);
    }

    /* Clear TIMER counter value */
    TIMER_CounterSet(US_TICKER_TIMER, 0);

    /* Start TIMER */
    TIMER_Enable(US_TICKER_TIMER, true);

    /* Select Compare Channel parameters */
    TIMER_InitCC_TypeDef timerCCInit = TIMER_INITCC_DEFAULT;
    timerCCInit.mode = timerCCModeCompare;

    /* Configure Compare Channel 0 */
    TIMER_InitCC(US_TICKER_TIMER, 0, &timerCCInit);

    /* Enable interrupt vector in NVIC */
    TIMER_IntClear(US_TICKER_TIMER, TIMER_IEN_CC0);
    NVIC_SetVector(US_TICKER_TIMER_IRQ, (uint32_t) us_ticker_irq_handler);
    NVIC_EnableIRQ(US_TICKER_TIMER_IRQ);
}

/**************************************************************************//**
 * @brief vPortSetupTimerInterrupt
 * Override the default definition of vPortSetupTimerInterrupt() that is weakly
 * defined in the FreeRTOS Cortex-M3, which set source of system tick interrupt
 *****************************************************************************/
void vPortSetupTimerInterrupt(void)
{
  /* Set our timer's data used as system ticks*/
  ulTimerReloadValueForOneTick = SYSTICK_LOAD_VALUE;
#if (configUSE_TICKLESS_IDLE == 1)
  xMaximumPossibleSuppressedTicks = TIMER_CAPACITY / (SYSTICK_LOAD_VALUE);
  ulStoppedTimerCompensation      = TIMER_COMPENSATION / (configCPU_CLOCK_HZ / configSYSTICK_CLOCK_HZ);
#endif /* (configUSE_TICKLESS_IDLE == 1) */
  /* Ensure LE modules are accessible */
  CMU_ClockEnable(cmuClock_CORELE, true);

  /* Enable access to BURTC registers */
  RMU_ResetControl(rmuResetBU, false);

  /* Configure BURTC as system tick source */
  BURTC_Init_TypeDef burtcInit = BURTC_INIT_DEFAULT;
  burtcInit.mode   = burtcModeEM3;                      /* BURTC is enabled to EM3 */
  burtcInit.clkSel = burtcClkSelULFRCO;                 /* Select ULFRCO as clock source */
  burtcInit.clkDiv = burtcClkDiv_1;                     /* Choose 2kHz ULFRCO clock frequency */
  /* Initialization of BURTC */
  BURTC_Init(&burtcInit);

  /* Disable interrupt generation from BURTC */
  BURTC_IntDisable(BURTC_IF_COMP0);

  /* Tick interrupt MUST execute at the lowest interrupt priority. */
  NVIC_SetPriority(BURTC_IRQn, 255);

  /* Enable interrupts */
  NVIC_ClearPendingIRQ(BURTC_IRQn);
  NVIC_EnableIRQ(BURTC_IRQn);
  BURTC_CompareSet(0, SYSTICK_LOAD_VALUE);
  BURTC_IntClear(BURTC_IF_COMP0);
  BURTC_IntEnable(BURTC_IF_COMP0);
  BURTC_CounterReset();
}

/**************************************************************************//**
 * @brief  Enabling clocks
 *****************************************************************************/
void setupCmu(void)
{
  /* Enabling clocks */
  CMU_ClockEnable(cmuClock_DMA, true);  
}

/**************************************************************************//**
 * @brief  Main function
 *         The example data is first encrypted and encrypted data is checked.
 *         The encrypted data is then decrypted and checked against original data.
 *         Program ends at last while loop if all is OK.
 *****************************************************************************/
int main(void)
{
  uint32_t i;
  
  /* Chip errata */
  CHIP_Init();

  /* Initialize error indicator */
  bool error = false;

  /* Enable AES clock */
  CMU_ClockEnable(cmuClock_AES, true);
  
  /* Copy plaintext to dataBuffer */
  for (i=0; i<(sizeof(exampleData) / sizeof(exampleData[0])); i++)
  {
    dataBuffer[i] = exampleData[i];
  }

  /* Encrypt data in AES-128 OFB */
  AesOfb128(exampleKey,
            dataBuffer,
            dataBuffer,
            sizeof(dataBuffer) / (sizeof(dataBuffer[0]) * 16),
            initVector);

  /* Wait for AES to finish */
  while (!AesFinished());

  /* Check whether encrypted results are correct */
  for (i = 0; i < (sizeof(dataBuffer) / sizeof(dataBuffer[0])); i++)
  {
    if (dataBuffer[i] != expectedEncryptedData[i])
    {
      error = true;
    }
  }

  /* Decrypt data in AES-128 OFB. Note that this is the same operation as encrypt */
  AesOfb128(exampleKey,
            dataBuffer,
            dataBuffer,
            sizeof(dataBuffer) / (sizeof(dataBuffer[0]) * 16),
            initVector);

  /* Wait for AES to finish */
  while (!AesFinished());

  /* Check whether decrypted result is identical to the plaintext */
  for (i = 0; i < (sizeof(dataBuffer) / sizeof(dataBuffer[0])); i++)
  {
    if (dataBuffer[i] != exampleData[i])
    {
      error = true;
    }
  }

  /* Check for success */
  if (error)
  {
    while (1) ; /* Ends here if there has been an error */
  }
  else
  {
    while (1) ; /* Ends here if all OK */
  }
}

/**************************************************************************//**
 * @brief  TIMER0_setup
 * Configures the TIMER
 *****************************************************************************/
void TIMER_setup(void)
{
  /* Enable necessary clocks */
  CMU_ClockEnable(cmuClock_TIMER0, true);
  CMU_ClockEnable(cmuClock_PRS, true);

  /* Select CC channel parameters */
  TIMER_InitCC_TypeDef timerCCInit =
  {
    .eventCtrl  = timerEventEveryEdge,      /* Input capture event control */
    .edge       = timerEdgeBoth,       /* Input capture on falling edge */
    .prsSel     = timerPRSSELCh5,         /* Prs channel select channel 5*/
    .cufoa      = timerOutputActionNone,  /* No action on counter underflow */
    .cofoa      = timerOutputActionNone,  /* No action on counter overflow */
    .cmoa       = timerOutputActionNone,  /* No action on counter match */
    .mode       = timerCCModeCapture,     /* CC channel mode capture */
    .filter     = false,                  /* No filter */
    .prsInput   = true,                   /* CC channel PRS input */
    .coist      = false,                  /* Comparator output initial state */
    .outInvert  = false,                  /* No output invert */
  };

  /* Initialize TIMER0 CC0 channel */
  TIMER_InitCC(HIJACK_RX_TIMER, 0, &timerCCInit);

  /* Select timer parameters */
  const TIMER_Init_TypeDef timerInit =
  {
    .enable     = false,                        /* Do not start counting when init complete */
    .debugRun   = false,                        /* Counter not running on debug halt */
    .prescale   = HIJACK_TIMER_RESOLUTION,      /* Prescaler of 1 */
    .clkSel     = timerClkSelHFPerClk,          /* TIMER0 clocked by the HFPERCLK */
    .fallAction = timerInputActionReloadStart,         /* Stop counter on falling edge */
    .riseAction = timerInputActionReloadStart,  /* Reload and start on rising edge */
    .mode       = timerModeUp,                  /* Counting up */
    .dmaClrAct  = false,                        /* No DMA */
    .quadModeX4 = false,                        /* No quad decoding */
    .oneShot    = false,                        /* Counting up constinuously */
    .sync       = false,                        /* No start/stop/reload by other timers */
  };

  /* Initialize TIMER0 */
  TIMER_Init(HIJACK_RX_TIMER, &timerInit);

  /* PRS setup */
  /* Select ACMP as source and ACMP0OUT (ACMP0 OUTPUT) as signal */
  PRS_SourceSignalSet(5, PRS_CH_CTRL_SOURCESEL_ACMP0, PRS_CH_CTRL_SIGSEL_ACMP0OUT, prsEdgeOff);

  /* Enable CC0 interrupt */
  TIMER_IntEnable(HIJACK_RX_TIMER, TIMER_IF_CC0);

  /* Enable TIMER0 interrupt vector in NVIC */
  NVIC_EnableIRQ(TIMER0_IRQn);
}

/**************************************************************************//**
 * @brief  ACMP_setup
 * Configures and starts the ACMP
 *****************************************************************************/
static void ACMP_setup(void)
{
  /* Enable necessary clocks */
  CMU_ClockEnable(HIJACK_RX_ACMPCLK, true);
  CMU_ClockEnable(cmuClock_GPIO, true);

  /* Configure ACMP input pin. */
  GPIO_PinModeSet(HIJACK_RX_GPIO_PORT, HIJACK_RX_GPIO_PIN, gpioModeInput, 0);

  /* Analog comparator parameters */
  const ACMP_Init_TypeDef acmpInit =
  {
    .fullBias                 = false,                  /* No full bias current*/
    .halfBias                 = true,                  /* No half bias current */
    .biasProg                 = 2,                      /* Biasprog current 1.4 uA */
    .interruptOnFallingEdge   = false,                  /* Disable interrupt for falling edge */
    .interruptOnRisingEdge    = false,                  /* Disable interrupt for rising edge */
    .warmTime                 = acmpWarmTime256,        /* Warm-up time in clock cycles, should be >140 cycles for >10us warm-up @ 14MHz */
    .hysteresisLevel          = acmpHysteresisLevel7,   /* Hysteresis level 0  - no hysteresis */
    .inactiveValue            = 1,                      /* Inactive comparator output value */
    .lowPowerReferenceEnabled = false,                  /* Low power reference mode disabled */
    .vddLevel                 = HIJACK_RX_ACMP_LEVEL,                     /* Vdd reference scaling of 32 */
  };

  /* Use ACMP0 output, PD6 . */
  //GPIO_PinModeSet(gpioPortD, 6, gpioModePushPull, 0);
  //ACMP_GPIOSetup(ACMP0, 2, true, false);

  /* Init ACMP and set ACMP channel 4 as positive input
     and scaled Vdd as negative input */
  ACMP_Init(HIJACK_RX_ACMP, &acmpInit);
  ACMP_ChannelSet(HIJACK_RX_ACMP, HIJACK_RX_ACMP_NEG, HIJACK_RX_ACMP_CH);
  ACMP_Enable(HIJACK_RX_ACMP);
}

/**
 * @brief calculate whether cnt is in 500us region
//.........这里部分代码省略.........

int main(void)
{
	CHIP_Init();

	CMU_ClockEnable(cmuClock_GPIO, true);
	CMU_ClockEnable(cmuClock_TIMER1, true);
	CMU_ClockEnable(cmuClock_TIMER3, true);

	// Set up TIMER1 for timekeeping
	TIMER_Init_TypeDef timerInit = TIMER_INIT_DEFAULT;
	timerInit.prescale = timerPrescale1024;

	TIMER_IntEnable(TIMER1, TIMER_IF_OF);

	// Enable TIMER1 interrupt vector in NVIC
	NVIC_EnableIRQ(TIMER1_IRQn);

	// Set TIMER Top value
	TIMER_TopSet(TIMER1, ONE_SECOND_TIMER_COUNT);

	TIMER_Init(TIMER1, &timerInit);

	// Wait for the timer to get going
	while (TIMER1->CNT == 0) ;

	// Enable LED output
	GPIO_PinModeSet(LED_PORT, LED_PIN, gpioModePushPull, 0);

	// Create the object initializer for LED PWM
	TIMER_InitCC_TypeDef timerCCInit = TIMER_INITCC_DEFAULT;
	timerCCInit.mode = timerCCModePWM;
	timerCCInit.cmoa = timerOutputActionToggle;

	// Configure TIMER3 CC channel 2
	TIMER_InitCC(TIMER3, TIMER_CHANNEL, &timerCCInit);

	// Route CC2 to location 1 (PE3) and enable pin for cc2
	TIMER3->ROUTE |= (TIMER_ROUTE_CC2PEN | TIMER_ROUTE_LOCATION_LOC1);

	// Set Top Value
	TIMER_TopSet(TIMER3, TIMER_TOP);

	// Set the PWM duty cycle here!
	TIMER_CompareBufSet(TIMER3, TIMER_CHANNEL, 0);

	// Create a timerInit object, based on the API default
	TIMER_Init_TypeDef timerInit2 = TIMER_INIT_DEFAULT;
	timerInit2.prescale = timerPrescale256;

	TIMER_Init(TIMER3, &timerInit2);

	enum mode_values { RAMPING_UP, HIGH, RAMPING_DOWN, LOW};

	// Check for properly sized constants
	uint16_t delta = MAX_BRIGHTNESS - MIN_BRIGHTNESS;
	if ( delta == 0 || RAMP_UP_TIME_MS % delta || RAMP_DOWN_TIME_MS % delta)
	{
		DEBUG_BREAK
	}

	// Set the initial condition
	uint16_t mode = RAMPING_UP;
	uint32_t time_step = RAMP_UP_TIME_MS / delta;
	uint16_t brightness = MIN_BRIGHTNESS;
	TIMER_CompareBufSet(TIMER3, TIMER_CHANNEL, brightness);

	uint64_t mode_timeout = set_ms_timeout(RAMP_UP_TIME_MS);

	while (1)
	{
		switch (mode)
		{
			case RAMPING_UP:
				delay_ms(time_step);
				brightness++;
				TIMER_CompareBufSet(TIMER3, TIMER_CHANNEL, brightness);
				if (expired_ms(mode_timeout))
				{
					mode = HIGH;
					mode_timeout = set_ms_timeout(HIGH_DURATION_MS);
				}
				break;
			case HIGH:
				if (expired_ms(mode_timeout))
				{
					mode = RAMPING_DOWN;
					time_step = RAMP_DOWN_TIME_MS / delta;
					mode_timeout = set_ms_timeout(RAMP_DOWN_TIME_MS);
				}
				break;
			case RAMPING_DOWN:
				delay_ms(time_step);
				brightness--;
				TIMER_CompareBufSet(TIMER3, TIMER_CHANNEL, brightness);
				if (expired_ms(mode_timeout))
				{
					mode = LOW;
					mode_timeout = set_ms_timeout(LOW_DURATION_MS);
				}
				break;
//.........这里部分代码省略.........