text: /**************************************************************************//**
   * @file     main.c
   * @version  V3.00
   * $Revision: 1 $
   * $Date: 14/10/01 10:35a $
   * @brief    NUC029 Series Timer Driver Sample Code
   *
   * @note
   * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
   ******************************************************************************/
  #include <stdio.h>
  #include "NUC029xAN.h"
  
  #define PLLCON_SETTING      CLK_PLLCON_50MHz_HXT
  #define PLL_CLOCK           50000000
  
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Global Interface Variables Declarations                                                                 */
  /*---------------------------------------------------------------------------------------------------------*/
  volatile uint32_t g_au32TMRINTCount[4] = {0};
  
  
  /**
   * @brief       Timer0 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The Timer0 default IRQ, declared in startup_NUC029xAN.s.
   */
  void TMR0_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER0) == 1)
      {
          /* Clear Timer0 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER0);
  
          g_au32TMRINTCount[0]++;
      }
  }
  
  /**
   * @brief       Timer1 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The Timer1 default IRQ, declared in startup_NUC029xAN.s.
   */
  void TMR1_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER1) == 1)
      {
          /* Clear Timer1 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER1);
  
          g_au32TMRINTCount[1]++;
      }
  }
  
  /**
   * @brief       Timer2 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The Timer2 default IRQ, declared in startup_NUC029xAN.s.
   */
  void TMR2_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER2) == 1)
      {
          /* Clear Timer2 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER2);
  
          g_au32TMRINTCount[2]++;
      }
  }
  
  /**
   * @brief       Timer3 IRQ
   *
   * @param       None
   *
   * @return      None
   *
   * @details     The Timer3 default IRQ, declared in startup_NUC029xAN.s.
   */
  void TMR3_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER3) == 1)
      {
          /* Clear Timer3 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER3);
  
          g_au32TMRINTCount[3]++;
      }
  }
  
  void SYS_Init(void)
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init System Clock                                                                                       */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Enable IRC22M clock */
      CLK->PWRCON |= CLK_PWRCON_IRC22M_EN_Msk;
  
      /* Waiting for IRC22M clock ready */
      CLK_WaitClockReady(CLK_CLKSTATUS_IRC22M_STB_Msk);
  
      /* Switch HCLK clock source to HIRC */
      CLK->CLKSEL0 = CLK_CLKSEL0_HCLK_S_HIRC;
  
      /* Set PLL to Power-down mode and PLL_STB bit in CLKSTATUS register will be cleared by hardware.*/
      CLK->PLLCON |= CLK_PLLCON_PD_Msk;
  
      /* Enable external 12 MHz XTAL, IRC10K */
      CLK->PWRCON |= CLK_PWRCON_XTL12M_EN_Msk | CLK_PWRCON_OSC10K_EN_Msk;
  
      /* Enable PLL and Set PLL frequency */
      CLK->PLLCON = PLLCON_SETTING;
  
      /* Waiting for clock ready */
      CLK_WaitClockReady(CLK_CLKSTATUS_PLL_STB_Msk | CLK_CLKSTATUS_XTL12M_STB_Msk | CLK_CLKSTATUS_IRC10K_STB_Msk);
  
      /* Switch HCLK clock source to PLL, STCLK to HCLK/2 */
      CLK->CLKSEL0 = CLK_CLKSEL0_STCLK_S_HCLK_DIV2 | CLK_CLKSEL0_HCLK_S_PLL;
  
      /* Enable peripheral clock */
      CLK->APBCLK = CLK_APBCLK_UART0_EN_Msk |
                    CLK_APBCLK_TMR0_EN_Msk | CLK_APBCLK_TMR1_EN_Msk | CLK_APBCLK_TMR2_EN_Msk | CLK_APBCLK_TMR3_EN_Msk;
  
      /* Peripheral clock source */
      CLK->CLKSEL1 = CLK_CLKSEL1_UART_S_PLL |
                     CLK_CLKSEL1_TMR0_S_HXT | CLK_CLKSEL1_TMR1_S_HCLK | CLK_CLKSEL1_TMR2_S_HIRC | CLK_CLKSEL1_TMR3_S_HXT;
  
      /* Update System Core Clock */
      /* User can use SystemCoreClockUpdate() to calculate PllClock, SystemCoreClock and CycylesPerUs automatically. */
      SystemCoreClockUpdate();
  
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init I/O Multi-function                                                                                 */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Set P3 multi-function pins for UART0 RXD, TXD */
      SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
      SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0);
  }
  
  void UART0_Init(void)
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init UART                                                                                               */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Reset IP */
      SYS_ResetModule(UART0_RST);
  
      /* Configure UART0 and set UART0 Baudrate */
      UART_Open(UART0, 115200);
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /*  MAIN function                                                                                          */
  /*---------------------------------------------------------------------------------------------------------*/
  int main(void)
  {
      volatile uint32_t u32InitCount;
  
      /* 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("|    Timer Periodic and Interrupt Sample Code    |\n");
      printf("+------------------------------------------------+\n\n");
  
      printf("# Timer Settings:\n");
      printf("  Timer0: Clock source 12 MHz;       Periodic mode; Enable interrupt; 1 interrupt tick/sec.\n");
      printf("  Timer1: Clock source HCLK(50 MHz); Periodic mode; Enable interrupt; 2 interrupt ticks/sec.\n");
      printf("  Timer2: Clock source HIRC(22 MHz); Periodic mode; Enable interrupt; 4 interrupt ticks/sec.\n");
      printf("  Timer3: Clock source 12 MHz;       Periodic mode; Enable interrupt; 8 interrupt ticks/sec.\n");
      printf("# Check Timer0 ~ Timer3 interrupt counts are reasonable or not.\n\n");
  
      /* Open Timer0 frequency to 0.5 Hz in periodic mode, and enable interrupt */
      TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1);
      TIMER_EnableInt(TIMER0);
  
      /* Open Timer1 frequency to 1 Hz in periodic mode, and enable interrupt */
      TIMER_Open(TIMER1, TIMER_PERIODIC_MODE, 2);
      TIMER_EnableInt(TIMER1);
  
      /* Open Timer2 frequency to 2 Hz in periodic mode, and enable interrupt */
      TIMER_Open(TIMER2, TIMER_PERIODIC_MODE, 4);
      TIMER_EnableInt(TIMER2);
  
      /* Open Timer3 frequency to 4 Hz in periodic mode, and enable interrupt */
      TIMER_Open(TIMER3, TIMER_PERIODIC_MODE, 8);
      TIMER_EnableInt(TIMER3);
  
      /* Enable Timer0 ~ Timer3 NVIC */
      NVIC_EnableIRQ(TMR0_IRQn);
      NVIC_EnableIRQ(TMR1_IRQn);
      NVIC_EnableIRQ(TMR2_IRQn);
      NVIC_EnableIRQ(TMR3_IRQn);
  
      /* Clear Timer0 ~ Timer3 interrupt counts to 0 */
      g_au32TMRINTCount[0] = g_au32TMRINTCount[1] = g_au32TMRINTCount[2] = g_au32TMRINTCount[3] = 0;
      u32InitCount = g_au32TMRINTCount[0];
  
      /* Start Timer0 ~ Timer3 counting */
      TIMER_Start(TIMER0);
      TIMER_Start(TIMER1);
      TIMER_Start(TIMER2);
      TIMER_Start(TIMER3);
  
      /* Check Timer0 ~ Timer3 interrupt counts */
      printf("# Timer interrupt counts :\n");
      while(u32InitCount < 20)
      {
          if(g_au32TMRINTCount[0] != u32InitCount)
          {
              printf("TMR0:%3d    TMR1:%3d    TMR2:%3d    TMR3:%3d\n",
                     g_au32TMRINTCount[0], g_au32TMRINTCount[1], g_au32TMRINTCount[2], g_au32TMRINTCount[3]);
              u32InitCount = g_au32TMRINTCount[0];
          }
      }
  
      printf("*** PASS ***\n");
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
  