text: /**************************************************************************//**
   * @file     main.c
   * @version  V3.00
   * @brief    Implement timer counting in periodic mode.
   *
   * @copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
   ******************************************************************************/
  #include <stdio.h>
  #include "NuMicro.h"
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Global Interface Variables Declarations                                                                 */
  /*---------------------------------------------------------------------------------------------------------*/
  volatile uint32_t g_au32TMRINTCount[4] = {0};
  
  
  void TMR0_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER0) == 1)
      {
          /* Clear Timer0 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER0);
  
          g_au32TMRINTCount[0]++;
      }
  }
  
  
  void TMR1_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER1) == 1)
      {
          /* Clear Timer1 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER1);
  
          g_au32TMRINTCount[1]++;
      }
  }
  
  
  void TMR2_IRQHandler(void)
  {
      if(TIMER_GetIntFlag(TIMER2) == 1)
      {
          /* Clear Timer2 time-out interrupt flag */
          TIMER_ClearIntFlag(TIMER2);
  
          g_au32TMRINTCount[2]++;
      }
  }
  
  
  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)
  {
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Set XT1_OUT(PF.2) and XT1_IN(PF.3) to input mode */
      PF->MODE &= ~(GPIO_MODE_MODE2_Msk | GPIO_MODE_MODE3_Msk);
  
      /* Enable HIRC clock */
      CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
  
      /* Waiting for 12MHz clock ready */
      CLK_WaitClockReady( CLK_STATUS_HXTSTB_Msk);
  
      /* Set core clock as PLL_CLOCK from PLL */
      CLK_SetCoreClock(FREQ_192MHZ);
  
      /* Set both PCLK0 and PCLK1 as HCLK/2 */
      CLK->PCLKDIV = CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2;
  
      /* Enable UART module clock */
      CLK_EnableModuleClock(UART0_MODULE);
      CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HXT, CLK_CLKDIV0_UART0(1));
  
      /* Enable TIMER module clock */
      CLK_EnableModuleClock(TMR0_MODULE);
      CLK_EnableModuleClock(TMR1_MODULE);
      CLK_EnableModuleClock(TMR2_MODULE);
      CLK_EnableModuleClock(TMR3_MODULE);
      CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_HXT, 0);
      CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_PCLK0, 0);
      CLK_SetModuleClock(TMR2_MODULE, CLK_CLKSEL1_TMR2SEL_HIRC, 0);
      CLK_SetModuleClock(TMR3_MODULE, CLK_CLKSEL1_TMR3SEL_HXT, 0);
  
      /* Update System Core Clock */
      /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock. */
      SystemCoreClockUpdate();
  
      /* Set GPB multi-function pins for UART0 RXD and TXD */
      SYS->GPB_MFPH &= ~(SYS_GPB_MFPH_PB12MFP_Msk | SYS_GPB_MFPH_PB13MFP_Msk);
      SYS->GPB_MFPH |= (SYS_GPB_MFPH_PB12MFP_UART0_RXD | SYS_GPB_MFPH_PB13MFP_UART0_TXD);
  
      /* Lock protected registers */
      SYS_LockReg();
  }
  
  int main(void)
  {
      uint32_t u32InitCount, au32Counts[4];
  
      /* Init System, IP clock and multi-function I/O
         In the end of SYS_Init() will issue SYS_LockReg()
         to lock protected register. If user want to write
         protected register, please issue SYS_UnlockReg()
         to unlock protected register if necessary */
      SYS_Init();
  
      /* Init UART to 115200-8n1 for print message */
      UART_Open(UART0, 115200);
  
      printf("\n\nCPU @ %d Hz\n", SystemCoreClock);
      printf("+--------------------------------------------+\n");
      printf("|    Timer Periodic Interrupt Sample Code    |\n");
      printf("+--------------------------------------------+\n\n");
  
      printf("# Timer0 Settings:\n");
      printf("    - Clock source is HXT       \n");
      printf("    - Time-out frequency is 1 Hz\n");
      printf("    - Periodic mode             \n");
      printf("    - Interrupt enable          \n");
      printf("# Timer1 Settings:\n");
      printf("    - Clock source is HCLK      \n");
      printf("    - Time-out frequency is 2 Hz\n");
      printf("    - Periodic mode             \n");
      printf("    - Interrupt enable          \n");
      printf("# Timer2 Settings:\n");
      printf("    - Clock source is HIRC      \n");
      printf("    - Time-out frequency is 4 Hz\n");
      printf("    - Periodic mode             \n");
      printf("    - Interrupt enable          \n");
      printf("# Timer3 Settings:\n");
      printf("    - Clock source is HXT       \n");
      printf("    - Time-out frequency is 8 Hz\n");
      printf("    - Periodic mode             \n");
      printf("    - Interrupt enable          \n");
      printf("# Check Timer0 ~ Timer3 interrupt counts are reasonable or not.\n\n");
  
      /* Open Timer0 in periodic mode, enable interrupt and 1 interrupt tick per second */
      TIMER_Open(TIMER0, TIMER_PERIODIC_MODE, 1);
      TIMER_EnableInt(TIMER0);
  
      /* Open Timer1 in periodic mode, enable interrupt and 2 interrupt ticks per second */
      TIMER_Open(TIMER1, TIMER_PERIODIC_MODE, 2);
      TIMER_EnableInt(TIMER1);
  
      /* Open Timer2 in periodic mode, enable interrupt and 4 interrupt ticks per second */
      TIMER_Open(TIMER2, TIMER_PERIODIC_MODE, 4);
      TIMER_EnableInt(TIMER2);
  
      /* Open Timer3 in periodic mode, enable interrupt and 8 interrupt ticks per second */
      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)
          {
              au32Counts[0] = g_au32TMRINTCount[0];
              au32Counts[1] = g_au32TMRINTCount[1];
              au32Counts[2] = g_au32TMRINTCount[2];
              au32Counts[3] = g_au32TMRINTCount[3];
              printf("    TMR0:%3d    TMR1:%3d    TMR2:%3d    TMR3:%3d\n",
                     au32Counts[0], au32Counts[1], au32Counts[2], au32Counts[3]);
              u32InitCount = g_au32TMRINTCount[0];
  
              if((au32Counts[1] > (au32Counts[0] * 2 + 1)) || (au32Counts[1] < (au32Counts[0] * 2 - 1)) ||
                      (au32Counts[2] > (au32Counts[0] * 4 + 1)) || (au32Counts[2] < (au32Counts[0] * 4 - 1)) ||
                      (au32Counts[3] > (au32Counts[0] * 8 + 1)) || (au32Counts[3] < (au32Counts[0] * 8 - 1)))
              {
                  printf("*** FAIL ***\n");
                  while(1) {}
              }
          }
      }
  
      printf("*** PASS ***\n");
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
  