text: /*************************************************************************//**
   * @file     main.c
   * @version  V1.00
   * @brief    Show a Slave how to receive data from Master.
   *           This sample code needs to work with USCI_I2C_Slave.
   *
   * @copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
  *****************************************************************************/
  #include <stdio.h>
  #include "NuMicro.h"
  
  #define PLL_CLOCK       192000000
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Global variables                                                                                        */
  /*---------------------------------------------------------------------------------------------------------*/
  uint8_t g_au8SlvData[256];
  uint8_t g_u8DeviceAddr;
  uint8_t g_au8SlvRxData[4];
  
  volatile uint32_t slave_buff_addr;
  volatile uint16_t g_u16SlvRcvAddr;
  volatile uint8_t g_u8SlvDataLen;
  
  volatile enum UI2C_SLAVE_EVENT s_Event;
  
  typedef void (*UI2C_FUNC)(uint32_t u32Status);
  
  static UI2C_FUNC s_UI2C0HandlerFn = NULL;
  
  
  void USCI0_IRQHandler(void)
  {
      uint32_t u32Status;
  
      //UI2C0 Interrupt
      u32Status = UI2C_GET_PROT_STATUS(UI2C0);
      if(s_UI2C0HandlerFn != NULL)
      {
          s_UI2C0HandlerFn(u32Status);
          CLK_SysTickDelay(1);
      }
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /*  USCI_I2C0 TRx Callback Function                                                                        */
  /*---------------------------------------------------------------------------------------------------------*/
  void UI2C_SlaveTRx(uint32_t u32Status)
  {
      uint32_t temp;
  
      if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
      {
          /* Clear START INT Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STARIF_Msk);
  
          /* Event process */
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_ADDRESS_ACK;
  
          UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
      }
      else if((u32Status & UI2C_PROTSTS_ACKIF_Msk) == UI2C_PROTSTS_ACKIF_Msk)
      {
          /* Clear ACK INT Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_ACKIF_Msk);
  
          /* Event process */
          if(s_Event == SLAVE_ADDRESS_ACK)
          {
              g_u8SlvDataLen = 0;
  
              if((UI2C0->PROTSTS & UI2C_PROTSTS_SLAREAD_Msk) == UI2C_PROTSTS_SLAREAD_Msk)
              {
                  /* Own SLA+R has been receive; ACK has been return */
                  s_Event = SLAVE_SEND_DATA;
                  UI2C_SET_DATA(UI2C0, g_au8SlvData[slave_buff_addr]);
                  slave_buff_addr++;
              }
              else
              {
                  s_Event = SLAVE_GET_DATA;
              }
              g_u16SlvRcvAddr = (uint8_t)UI2C_GET_DATA(UI2C0);
          }
          else if(s_Event == SLAVE_GET_DATA)
          {
              temp = UI2C_GET_DATA(UI2C0);
              g_au8SlvRxData[g_u8SlvDataLen] = temp;
              g_u8SlvDataLen++;
  
              if(g_u8SlvDataLen == 2)
              {
                  /* Address has been received; ACK has been returned*/
                  slave_buff_addr = (g_au8SlvRxData[0] << 8) + g_au8SlvRxData[1];
              }
              if(g_u8SlvDataLen == 3)
              {
                  g_au8SlvData[slave_buff_addr] = g_au8SlvRxData[2];
                  g_u8SlvDataLen = 0;
              }
          }
  
          UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
      }
      else if((u32Status & UI2C_PROTSTS_NACKIF_Msk) == UI2C_PROTSTS_NACKIF_Msk)
      {
          /* Clear NACK INT Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_NACKIF_Msk);
  
          /* Event process */
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_ADDRESS_ACK;
  
          UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
      }
      else if((u32Status & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk)
      {
          /* Clear STOP INT Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STORIF_Msk);
  
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_ADDRESS_ACK;
  
          UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
      }
  }
  
  void SYS_Init(void)
  {
      /* Set XT1_OUT(PF.2) and XT1_IN(PF.3) to input mode */
      PF->MODE &= ~(GPIO_MODE_MODE2_Msk | GPIO_MODE_MODE3_Msk);
  
      /* Enable external XTAL 12MHz clock */
      CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
  
      /* Waiting for external XTAL clock ready */
      CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
  
      /* Set core clock as PLL_CLOCK from PLL */
      CLK_SetCoreClock(PLL_CLOCK);
  
      /* Set PCLK0 = PCLK1 = HCLK/2 */
      CLK->PCLKDIV = (CLK_PCLKDIV_APB0DIV_DIV2 | CLK_PCLKDIV_APB1DIV_DIV2);
  
      /* Enable UART module clock */
      CLK_EnableModuleClock(UART0_MODULE);
  
      /* Enable IP clock */
      CLK_EnableModuleClock(USCI0_MODULE);
  
      /* Select UART module clock source */
      CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART0SEL_HXT, CLK_CLKDIV0_UART0(1));
  
      /* Update System Core Clock */
      /* User can use SystemCoreClockUpdate() to calculate SystemCoreClock and cyclesPerUs automatically. */
      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);
  
      /* Set UI2C0 multi-function pins */
      SYS->GPA_MFPH = (SYS->GPA_MFPH & ~(SYS_GPA_MFPH_PA11MFP_Msk | SYS_GPA_MFPH_PA10MFP_Msk)) |
                      (SYS_GPA_MFPH_PA11MFP_USCI0_CLK | SYS_GPA_MFPH_PA10MFP_USCI0_DAT0);
  
      /* USCI_I2C clock pin enable schmitt trigger */
      PA->SMTEN |= GPIO_SMTEN_SMTEN11_Msk;
  }
  
  void UI2C0_Init(uint32_t u32ClkSpeed)
  {
      /* Open USCI_I2C0 and set clock to 100k */
      UI2C_Open(UI2C0, u32ClkSpeed);
  
      /* Get USCI_I2C0 Bus Clock */
      printf("UI2C0 clock %d Hz\n", UI2C_GetBusClockFreq(UI2C0));
  
      /* Set USCI_I2C0 Slave Addresses */
      UI2C_SetSlaveAddr(UI2C0, 0, 0x15, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x15 */
      UI2C_SetSlaveAddr(UI2C0, 1, 0x35, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x35 */
  
      /* Set USCI_I2C0 Slave Addresses Mask */
      UI2C_SetSlaveAddrMask(UI2C0, 0, 0x01);                    /* Slave Address : 0x1 */
      UI2C_SetSlaveAddrMask(UI2C0, 1, 0x04);                    /* Slave Address : 0x4 */
  
      /* Enable UI2C0 protocol interrupt */
      UI2C_ENABLE_PROT_INT(UI2C0, (UI2C_PROTIEN_ACKIEN_Msk | UI2C_PROTIEN_NACKIEN_Msk | UI2C_PROTIEN_STORIEN_Msk | UI2C_PROTIEN_STARIEN_Msk));
      NVIC_EnableIRQ(USCI0_IRQn);
  
  }
  
  int main()
  {
      uint32_t i;
  
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Init System, IP clock and multi-function I/O. */
      SYS_Init();
  
      /* Init UART for print message */
      UART_Open(UART0, 115200);
  
      /*
          This sample code sets USCI_I2C bus clock to 100kHz. Then, Master accesses Slave with Byte Write
          and Byte Read operations, and check if the read data is equal to the programmed data.
      */
  
      printf("+--------------------------------------------------------+\n");
      printf("|  USCI_I2C Driver Sample Code for Master access 7-bit   |\n");
      printf("|  address Slave. This sample code needs work with       |\n");
      printf("|  USCI_I2C_Slave sample code                            |\n");
      printf("|         UI2C0(Master)  <----> UI2C0(Slave)             |\n");
      printf("|  This sample code requires two boards for testing      |\n");
      printf("+--------------------------------------------------------+\n");
  
      printf("\n");
      printf("Configure UI2C0 as Slave.\n");
      printf("The I/O connection for UI2C0:\n");
      printf("UI2C0_SDA(PA10), UI2C0_SCL(PA11)\n");
  
      /* Init USCI_I2C0 */
      UI2C0_Init(100000);
  
      s_Event = SLAVE_ADDRESS_ACK;
  
      UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_AA));
  
      for(i = 0; i < 0x100; i++)
      {
          g_au8SlvData[i] = 0;
      }
  
      /* I2C function to Slave receive/transmit data */
      s_UI2C0HandlerFn = UI2C_SlaveTRx;
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
  