text: /****************************************************************************
   * @file     main.c
   * @version  V2.0
   * $Revision: 2 $
   * $Date: 16/10/25 4:30p $
   * @brief    Show Smartcrd UART by connecting PA.0 and PA.1 pins.
   * @note
   * Copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
   ******************************************************************************/
  #include <stdio.h>
  #include "NUC126.h"
  
  
  #define PLL_CLOCK   72000000
  
  uint8_t au8TxBuf[] = "Hello World!";
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* The interrupt services routine of Smart Card                                                            */
  /*---------------------------------------------------------------------------------------------------------*/
  void SC01_IRQHandler(void)
  {
      // Print SCUART received data to UART port
      // Data length here is short, so we're not care about UART FIFO over flow.
      UART_WRITE(UART0, SCUART_READ(SC0));
  
      // RDA is the only interrupt enabled in this sample, this status bit
      // automatically cleared after Rx FIFO empty. So no need to clear interrupt
      // status here.
  
      return;
  }
  
  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 and HCLK source divider as 1 */
      CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
  
      /* Set PLL to Power-down mode and PLLSTB bit in CLK_STATUS register will be cleared by hardware.*/
      CLK_DisablePLL();
  
      /* 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);
  
      /* Peripheral clock source */
      CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_PLL, CLK_CLKDIV0_UART(1));
  
      /* Enable SC0 module clock */
      CLK_EnableModuleClock(SC0_MODULE);
  
      /* Select SC0 module clock source from PLL */
      CLK_SetModuleClock(SC0_MODULE, CLK_CLKSEL3_SC0SEL_PLL, CLK_CLKDIV1_SC0(1));
  
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init I/O Multi-function                                                                                 */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Set PD multi-function pins for UART0 RXD, TXD */
      SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);
      SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);
  
      /* Set PA multi-function pins for SC UART mode */
      SYS->GPA_MFPL &= ~(SYS_GPA_MFPL_PA0MFP_Msk | SYS_GPA_MFPL_PA1MFP_Msk);
      SYS->GPA_MFPL |= (SYS_GPA_MFPL_PA0MFP_SC0_CLK | SYS_GPA_MFPL_PA1MFP_SC0_DAT);
  }
  
  void UART0_Init(void)
  {
      /*---------------------------------------------------------------------------------------------------------*/
      /* Init UART                                                                                               */
      /*---------------------------------------------------------------------------------------------------------*/
      /* Reset UART module */
      SYS_ResetModule(UART0_RST);
  
      /* Configure UART0 and set UART0 Baudrate */
      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 @ %dHz\n", SystemCoreClock);
      printf("+----------------------------------------+\n");
      printf("|    Smart Card UART Mode Sample Code    |\n");
      printf("+----------------------------------------+\n\n");
      printf("# Please connect SC0 CLK pin(PA.0) with SC0 DAT pin(PA.1) first.\n");
      printf("    - PA.0 as UART Tx\n");
      printf("    - PA.1 as UART Rx\n");
      printf("# Check check UART message ... Is Hello World! ?\n\n");
  
      /* Open smartcard interface 0 in UART mode */
      SCUART_Open(SC0, 115200);
  
      /* Enable receive interrupt */
      SCUART_ENABLE_INT(SC0, SC_INTEN_RDAIEN_Msk);
      NVIC_EnableIRQ(SC01_IRQn);
  
      /* Write data to SC UART interface */
      SCUART_Write(SC0, au8TxBuf, sizeof(au8TxBuf));
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
  