text: /**************************************************************************//**
   * @file     main.c
   * @version  V3.00
   * @brief    Demonstrate EPWM accumulator stop mode.
   *
   * @copyright SPDX-License-Identifier: Apache-2.0
   * @copyright Copyright (C) 2021 Nuvoton Technology Corp. All rights reserved.
   ******************************************************************************/
  #include <stdio.h>
  #include "NuMicro.h"
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Macro, type and constant definitions                                                                    */
  /*---------------------------------------------------------------------------------------------------------*/
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Global variables                                                                                        */
  /*---------------------------------------------------------------------------------------------------------*/
  /**
   * @brief       EPWM1 IRQ Handler
   *
   * @param       None
   *
   * @return      None
   *
   * @details     ISR to handle EPWM1 interrupt event
   */
  
  void EPWM1P0_IRQHandler(void);
  void SYS_Init(void);
  void UART0_Init(void);
  
  
  void EPWM1P0_IRQHandler(void)
  {
      EPWM_ClearAccInt(EPWM1, 0);
      printf("Check if output toggles 11 times then stop toggles.\n");
  }
  
  void SYS_Init(void)
  {
  
      /* Set PF multi-function pins for XT1_OUT(PF.2) and XT1_IN(PF.3) */
      SET_XT1_OUT_PF2();
      SET_XT1_IN_PF3();
  
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init System Clock                                                                                       */
      /*---------------------------------------------------------------------------------------------------------*/
  
      /* Enable HIRC and HXT clock */
      CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk | CLK_PWRCTL_HXTEN_Msk);
  
      /* Wait for HIRC and HXT clock ready */
      CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk | CLK_STATUS_HXTSTB_Msk);
  
      /* Set PCLK0 and PCLK1 to HCLK/2 */
      CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);
  
      /* Set core clock to 200MHz */
      CLK_SetCoreClock(200000000);
  
      /* Enable all GPIO clock */
      CLK->AHBCLK0 |= CLK_AHBCLK0_GPACKEN_Msk | CLK_AHBCLK0_GPBCKEN_Msk | CLK_AHBCLK0_GPCCKEN_Msk | CLK_AHBCLK0_GPDCKEN_Msk |
                      CLK_AHBCLK0_GPECKEN_Msk | CLK_AHBCLK0_GPFCKEN_Msk | CLK_AHBCLK0_GPGCKEN_Msk | CLK_AHBCLK0_GPHCKEN_Msk;
      CLK->AHBCLK1 |= CLK_AHBCLK1_GPICKEN_Msk | CLK_AHBCLK1_GPJCKEN_Msk;
  
      /* Enable UART0 module clock */
      CLK_EnableModuleClock(UART0_MODULE);
  
      /* Select UART0 module clock source as HIRC and UART0 module clock divider as 1 */
      CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HIRC, CLK_CLKDIV0_UART0(1));
  
      /* Enable EPWM1 module clock */
      CLK_EnableModuleClock(EPWM1_MODULE);
  
      /* Select EPWM1 module clock source */
      CLK_SetModuleClock(EPWM1_MODULE, CLK_CLKSEL2_EPWM1SEL_PCLK1, 0);
  
  
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init I/O Multi-function                                                                                 */
      /*---------------------------------------------------------------------------------------------------------*/
  
      /* Set multi-function pins for UART0 RXD and TXD */
      SET_UART0_RXD_PB12();
      SET_UART0_TXD_PB13();
  
      /* Set multi-function pin for EPWM */
      SET_EPWM1_CH0_PC5();
  
  }
  
  void UART0_Init(void)
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init UART                                                                                               */
      /*---------------------------------------------------------------------------------------------------------*/
  
      /* Configure UART0 and set UART0 baud rate */
      UART_Open(UART0, 115200);
  }
  
  int32_t main(void)
  {
      /* 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 */
  
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Init System, IP clock and multi-function I/O */
      SYS_Init();
  
      /* Lock protected registers */
      SYS_LockReg();
  
      /* Init UART to 115200-8n1 for print message */
      UART0_Init();
  
      printf("\n\nCPU @ %dHz(PLL@ %dHz)\n", SystemCoreClock, PllClock);
      printf("+------------------------------------------------------------------------+\n");
      printf("|                          EPWM Driver Sample Code                       |\n");
      printf("|                                                                        |\n");
      printf("+------------------------------------------------------------------------+\n");
      printf("  This sample code demonstrate EPWM1 channel 0 accumulator stop mode.\n");
      printf("  When accumulator interrupt happens, the output of EPWM1 channel 0 stops.\n");
      printf("  Since interrupt accumulator count is set to 10, the output toggles 11 times then stops. \n");
  
      printf("\n\nPress any key to start EPWM1 channel 0.\n");
      getchar();
  
      /*--------------------------------------------------------------------------------------*/
      /* Set the EPWM1 Channel 0 as EPWM output function.                                     */
      /*--------------------------------------------------------------------------------------*/
  
      /* Set EPWM1 channel 0 output configuration */
      EPWM_ConfigOutputChannel(EPWM1, 0, 300, 30);
  
      /* Enable EPWM Output path for EPWM1 channel 0 */
      EPWM_EnableOutput(EPWM1, EPWM_CH_0_MASK);
  
      /* Enable EPWM1 channel 0 accumulator, interrupt count 10, accumulator source select to zero point */
      EPWM_EnableAcc(EPWM1, 0, 10, EPWM_IFA_ZERO_POINT);
  
      /* Enable EPWM1 channel 0 accumulator interrupt */
      EPWM_EnableAccInt(EPWM1, 0);
  
      /* Enable EPWM1 channel 0 interrupt in the NVIC interrupt controller */
      NVIC_EnableIRQ(EPWM1P0_IRQn);
  
      /* Enable EPWM1 channel 0 accumulator stop mode */
      EPWM_EnableAccStopMode(EPWM1, 0);
  
      /* Enable Timer for EPWM1 channel 0 */
      EPWM_Start(EPWM1, EPWM_CH_0_MASK);
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2021 Nuvoton Technology Corp. ***/
  