text: /**************************************************************************//**
   * @file     main.c
   * @version  V3.00
   * $Revision: 5 $
   * $Date: 16/10/17 3:05p $
   * @brief    Show the usage of GPIO external interrupt function and de-bounce function.
   * @note
   * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
   ******************************************************************************/
  #include <stdio.h>
  #include "M0564.h"
  
  
  #define PLLCTL_SETTING  CLK_PLLCTL_72MHz_HXT
  #define PLL_CLOCK       72000000
  
  
  /**
   * @brief       External INT0/2/4 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The External INT0/2/4 default IRQ, declared in startup_M0564.s.
   */
  void EINT024_IRQHandler(void)
  {
      /* For PD.2, clear the INT flag */
      GPIO_CLR_INT_FLAG(PD, BIT2);
  
      printf("PD.2 EINT0 occurred.\n");
  }
  
  /**
   * @brief       External INT1/3/5 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The External INT1/3/5 default IRQ, declared in startup_M0564.s.
   */
  void EINT135_IRQHandler(void)
  {
      /* For PD.3, clear the INT flag */
      GPIO_CLR_INT_FLAG(PD, BIT3);
  
      printf("PD.3 EINT1 occurred.\n");
  }
  
  void SYS_Init(void)
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init System Clock                                                                                       */
      /*---------------------------------------------------------------------------------------------------------*/
  
      /* Enable HIRC clock (Internal RC 22.1184MHz) */
      CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
  
      /* Wait for HIRC clock ready */
      CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
  
      /* Select HCLK clock source as HIRC and HCLK source divider as 1 */
      CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
  
      /* Enable HXT clock (external XTAL 12MHz) */
      CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
  
      /* Wait for HXT clock ready */
      CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
  
      /* Set core clock as PLL_CLOCK from PLL */
      CLK_SetCoreClock(PLL_CLOCK);
  
      /* Enable UART module clock */
      CLK_EnableModuleClock(UART0_MODULE);
  
      /* Select UART module clock source as HXT and UART module clock divider as 1 */
      CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
  
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init I/O Multi-function                                                                                 */
      /*---------------------------------------------------------------------------------------------------------*/
  
      /* Set PD multi-function pins for UART0 RXD(PD.0) and TXD(PD.1) */
      SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD0MFP_Msk)) | SYS_GPD_MFPL_PD0MFP_UART0_RXD;
      SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD1MFP_Msk)) | SYS_GPD_MFPL_PD1MFP_UART0_TXD;
  
      /* Set PD multi-function pin for EINT0(PD.2) and EINT1(PD.3)*/
      SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD2MFP_Msk)) | SYS_GPD_MFPL_PD2MFP_INT0;
      SYS->GPD_MFPL = (SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD3MFP_Msk)) | SYS_GPD_MFPL_PD3MFP_INT1;
  
  }
  
  void UART0_Init()
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init UART                                                                                               */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Reset UART0 */
      SYS_ResetModule(UART0_RST);
  
      /* Configure UART0 and set UART0 baud rate */
      UART_Open(UART0, 115200);
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* MAIN function                                                                                           */
  /*---------------------------------------------------------------------------------------------------------*/
  int main(void)
  {
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Init System, peripheral clock and multi-function I/O */
      SYS_Init();
  
      /* Lock protected registers */
      SYS_LockReg();
  
      /* Init UART0 for printf */
      UART0_Init();
  
      printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
      printf("+------------------------------------------------------------+\n");
      printf("|    GPIO EINT0/EINT1 Interrupt and De-bounce Sample Code    |\n");
      printf("+------------------------------------------------------------+\n\n");
  
      /*-----------------------------------------------------------------------------------------------------*/
      /* GPIO External Interrupt Function Test                                                               */
      /*-----------------------------------------------------------------------------------------------------*/
      printf("EINT0(PD.2) and EINT1(PD.3) are used to test interrupt \n");
  
      /* Configure PD.2 as EINT0 pin and enable interrupt by falling edge trigger */
      GPIO_SetMode(PD, BIT2, GPIO_MODE_INPUT);
      GPIO_EnableInt(PD, 2, GPIO_INT_FALLING);
      NVIC_EnableIRQ(EINT024_IRQn);
  
      /* Configure PD.3 as EINT1 pin and enable interrupt by falling and rising edge trigger */
      GPIO_SetMode(PD, BIT3, GPIO_MODE_INPUT);
      GPIO_EnableInt(PD, 3, GPIO_INT_BOTH_EDGE);
      NVIC_EnableIRQ(EINT135_IRQn);
  
      /* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 clocks of LIRC clock */
      GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_1024);
      GPIO_ENABLE_DEBOUNCE(PD, BIT2);
      GPIO_ENABLE_DEBOUNCE(PD, BIT3);
  
      /* Waiting for interrupts */
      while(1);
  }
  
  /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
  