text: /**************************************************************************//**
   * @file     main.c
   * @version  V1.00
   * @brief    Show a Master how to access 10-bit address Slave (loopback)
   *
   * @copyright (C) 2016 Nuvoton Technology Corp. All rights reserved.
  *****************************************************************************/
  #include <stdio.h>
  #include "NuMicro.h"
  
  #define PLL_CLOCK       192000000
  
  #define SLV_10BIT_ADDR (0x1E<<2)             //1111+0xx+r/w
  
  /*---------------------------------------------------------------------------------------------------------*/
  /* Global variables                                                                                        */
  /*---------------------------------------------------------------------------------------------------------*/
  volatile uint8_t g_u8DeviceHAddr;
  volatile uint8_t g_u8DeviceLAddr;
  uint8_t g_u8SlvData[256];
  uint8_t g_au8SlvRxData[4];
  uint8_t g_au8MstTxData[3];
  uint8_t g_u8MstDataLen;
  uint8_t g_u8SlvDataLen;
  volatile uint8_t g_u8DeviceAddr;
  volatile uint8_t g_u8MstRxData;
  volatile uint8_t g_u8MstEndFlag = 0;
  volatile uint32_t slave_buff_addr;
  volatile uint16_t g_u16SlvRcvAddr;
  
  
  volatile enum UI2C_MASTER_EVENT m_Event;
  volatile enum UI2C_SLAVE_EVENT s_Event;
  
  typedef void (*UI2C_FUNC)(uint32_t u32Status);
  
  static UI2C_FUNC s_UI2C0HandlerFn = NULL;
  static UI2C_FUNC s_UI2C1HandlerFn = NULL;
  
  
  void USCI0_IRQHandler(void)
  {
      uint32_t u32Status;
  
      //UI2C0 Interrupt
      u32Status = UI2C_GET_PROT_STATUS(UI2C0);
      if(s_UI2C0HandlerFn != NULL)
          s_UI2C0HandlerFn(u32Status);
  }
  
  void USCI1_IRQHandler(void)
  {
      uint32_t u32Status;
  
      //USCI1 Interrupt
      u32Status = UI2C_GET_PROT_STATUS(UI2C1);
      if (s_UI2C1HandlerFn != NULL)
          s_UI2C1HandlerFn(u32Status);
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /*  USCI_I2C0 Rx Callback Function                                                                         */
  /*---------------------------------------------------------------------------------------------------------*/
  void UI2C_MasterRx(uint32_t u32Status)
  {
      if((UI2C0->PROTSTS & UI2C_PROTSTS_TOIF_Msk) == UI2C_PROTSTS_TOIF_Msk)
      {
          /* Clear USCI_I2C0 Timeout Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_TOIF_Msk);
      }
      else if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STARIF_Msk);  /* Clear START INT Flag */
  
          if(m_Event == MASTER_SEND_START)
          {
              UI2C_SET_DATA(UI2C0, (g_u8DeviceHAddr << 1) | 0x00); /* Write SLA+W to Register TXDAT */
              m_Event = MASTER_SEND_H_WR_ADDRESS;
          }
          else if(m_Event == MASTER_SEND_REPEAT_START)
          {
              UI2C_SET_DATA(UI2C0, (g_u8DeviceHAddr << 1) | 0x01); /* Write SLA+R to Register TXDAT */
              m_Event = MASTER_SEND_H_RD_ADDRESS;
          }
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
      }
      else if((u32Status & UI2C_PROTSTS_ACKIF_Msk) == UI2C_PROTSTS_ACKIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_ACKIF_Msk);  /* Clear ACK INT Flag */
          if(m_Event == MASTER_SEND_H_WR_ADDRESS)
          {
              UI2C_SET_DATA(UI2C0, g_u8DeviceLAddr);
              m_Event = MASTER_SEND_L_ADDRESS;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          }
          else if(m_Event == MASTER_SEND_L_ADDRESS)
          {
              UI2C_SET_DATA(UI2C0, g_au8MstTxData[g_u8MstDataLen++]);  /* SLA+W has been transmitted and write ADDRESS to Register TXDAT */
              m_Event = MASTER_SEND_DATA;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          }
          else if(m_Event == MASTER_SEND_DATA)
          {
              if(g_u8MstDataLen != 2)
              {
                  UI2C_SET_DATA(UI2C0, g_au8MstTxData[g_u8MstDataLen++]);  /* ADDRESS has been transmitted and write DATA to Register TXDAT */
                  UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
              }
              else
              {
                  m_Event = MASTER_SEND_REPEAT_START;
                  UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STA));    /* Send repeat START signal */
              }
          }
          else if(m_Event == MASTER_SEND_H_RD_ADDRESS)
          {
              m_Event = MASTER_READ_DATA;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          }
      }
      else if((u32Status & UI2C_PROTSTS_NACKIF_Msk) == UI2C_PROTSTS_NACKIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_NACKIF_Msk);      /* Clear NACK INT Flag */
  
          if(m_Event == MASTER_SEND_H_WR_ADDRESS)
          {
              m_Event = MASTER_SEND_START;
              UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STA));    /* Send START signal */
          }
          else if(m_Event == MASTER_SEND_L_ADDRESS)
          {
              m_Event = MASTER_STOP;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_STO);
          }
          else if(m_Event == MASTER_READ_DATA)
          {
              g_u8MstRxData = (uint8_t) UI2C_GET_DATA(UI2C0);
              m_Event = MASTER_STOP;
              UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STO));    /* DATA has been received and send STOP signal */
          }
          else
              /* TO DO */
              printf("Status 0x%x is NOT processed\n", u32Status);
      }
      else if((u32Status & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STORIF_Msk);               /* Clear STOP INT Flag */
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          g_u8MstEndFlag = 1;
      }
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /*  USCI_I2C0 Tx Callback Function                                                                         */
  /*---------------------------------------------------------------------------------------------------------*/
  void UI2C_MasterTx(uint32_t u32Status)
  {
      if((UI2C0->PROTSTS & UI2C_PROTSTS_TOIF_Msk) == UI2C_PROTSTS_TOIF_Msk)
      {
          /* Clear USCI_I2C0 Timeout Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_TOIF_Msk);
      }
      else if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STARIF_Msk);               /* Clear START INT Flag */
  
          UI2C_SET_DATA(UI2C0, (g_u8DeviceHAddr << 1) | 0x00);     /* Write SLA+W to Register TXDAT */
          m_Event = MASTER_SEND_H_WR_ADDRESS;
  
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
      }
      else if((u32Status & UI2C_PROTSTS_ACKIF_Msk) == UI2C_PROTSTS_ACKIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_ACKIF_Msk);   /* Clear ACK INT Flag */
          /* Event process */
          if(m_Event == MASTER_SEND_H_WR_ADDRESS)
          {
              UI2C_SET_DATA(UI2C0, g_u8DeviceLAddr);
              m_Event = MASTER_SEND_L_ADDRESS;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          }
          else if(m_Event == MASTER_SEND_L_ADDRESS)
          {
              UI2C_SET_DATA(UI2C0, g_au8MstTxData[g_u8MstDataLen++]);  /* SLA+W has been transmitted and write ADDRESS to Register TXDAT */
              m_Event = MASTER_SEND_DATA;
              UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          }
          else if(m_Event == MASTER_SEND_DATA)
          {
              if(g_u8MstDataLen != 3)
              {
                  UI2C_SET_DATA(UI2C0, g_au8MstTxData[g_u8MstDataLen++]);  /* ADDRESS has been transmitted and write DATA to Register TXDAT */
                  UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
              }
              else
              {
                  m_Event = MASTER_STOP;
                  UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STO));        /* Send STOP signal */
              }
          }
      }
      else if((u32Status & UI2C_PROTSTS_NACKIF_Msk) == UI2C_PROTSTS_NACKIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_NACKIF_Msk);  /* Clear NACK INT Flag */
          g_u8MstEndFlag = 0;
          if(m_Event == MASTER_SEND_H_WR_ADDRESS)
          {
              /* SLA+W has been transmitted and NACK has been received */
              m_Event = MASTER_SEND_START;
              UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STA));            /* Send START signal */
          }
          else if(m_Event==MASTER_SEND_L_ADDRESS)
          {
              /* ADDRESS has been transmitted and NACK has been received */
              m_Event = MASTER_STOP;
              UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STO));            /* Send STOP signal */
          }
          else if(m_Event == MASTER_SEND_DATA)
          {
              /* ADDRESS has been transmitted and NACK has been received */
              m_Event = MASTER_STOP;
              UI2C_SET_CONTROL_REG(UI2C0, (UI2C_CTL_PTRG | UI2C_CTL_STO));            /* Send STOP signal */
          }
          else
              printf("Get Wrong NACK Event\n");
      }
      else if((u32Status & UI2C_PROTSTS_STORIF_Msk) == UI2C_PROTSTS_STORIF_Msk)
      {
          UI2C_CLR_PROT_INT_FLAG(UI2C0, UI2C_PROTSTS_STORIF_Msk);               /* Clear STOP INT Flag */
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_PTRG);
          g_u8MstEndFlag = 1;
      }
  }
  
  /*---------------------------------------------------------------------------------------------------------*/
  /*  USCI_I2C1 TRx Callback Function                                                                        */
  /*---------------------------------------------------------------------------------------------------------*/
  void UI2C_LB_SlaveTRx(uint32_t u32Status)
  {
      if((u32Status & UI2C_PROTSTS_STARIF_Msk) == UI2C_PROTSTS_STARIF_Msk)
      {
          /* Clear START INT Flag */
          UI2C_CLR_PROT_INT_FLAG(UI2C1, UI2C_PROTSTS_STARIF_Msk);
  
          /* Event process */
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_H_RD_ADDRESS_ACK;
  
          UI2C_SET_CONTROL_REG(UI2C1, (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(UI2C1, UI2C_PROTSTS_ACKIF_Msk);
  
          /* Event process */
          if(s_Event == SLAVE_H_WR_ADDRESS_ACK)
          {
              g_u8SlvDataLen = 0;
  
              s_Event = SLAVE_L_WR_ADDRESS_ACK;
              g_u16SlvRcvAddr = (uint8_t)UI2C_GET_DATA(UI2C1);
          }
          else if(s_Event == SLAVE_H_RD_ADDRESS_ACK)
          {
              g_u8SlvDataLen = 0;
  
              UI2C_SET_DATA(UI2C1, g_u8SlvData[slave_buff_addr]);
              slave_buff_addr++;
              g_u16SlvRcvAddr = (uint8_t)UI2C_GET_DATA(UI2C1);
          }
          else if(s_Event == SLAVE_L_WR_ADDRESS_ACK)
          {
              if((UI2C1->PROTSTS & UI2C_PROTSTS_SLAREAD_Msk) == UI2C_PROTSTS_SLAREAD_Msk)
              {
                  UI2C_SET_DATA(UI2C1, g_u8SlvData[slave_buff_addr]);
                  slave_buff_addr++;
              }
              else
              {
                  s_Event = SLAVE_GET_DATA;
              }
              g_u16SlvRcvAddr = (uint8_t)UI2C_GET_DATA(UI2C1);
          }
          else if(s_Event == SLAVE_L_RD_ADDRESS_ACK)
          {
              UI2C_SET_DATA(UI2C1, g_u8SlvData[slave_buff_addr]);
              slave_buff_addr++;
          }
          else if(s_Event == SLAVE_GET_DATA)
          {
              g_au8SlvRxData[g_u8SlvDataLen] = (uint8_t)UI2C_GET_DATA(UI2C1);
              g_u8SlvDataLen++;
  
              if(g_u8SlvDataLen == 2)
              {
                  slave_buff_addr = (g_au8SlvRxData[0] << 8) + g_au8SlvRxData[1];
              }
              if(g_u8SlvDataLen == 3)
              {
                  g_u8SlvData[slave_buff_addr] = g_au8SlvRxData[2];
                  g_u8SlvDataLen = 0;
              }
          }
          UI2C_SET_CONTROL_REG(UI2C1, (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(UI2C1, UI2C_PROTSTS_NACKIF_Msk);
          /* Event process */
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_H_WR_ADDRESS_ACK;
  
          UI2C_SET_CONTROL_REG(UI2C1, (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(UI2C1, UI2C_PROTSTS_STORIF_Msk);
          /* Event process */
          g_u8SlvDataLen = 0;
          s_Event = SLAVE_H_WR_ADDRESS_ACK;
          UI2C_SET_CONTROL_REG(UI2C1, (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);
      CLK_EnableModuleClock(USCI1_MODULE);
  
      /* Select UART module clock source as HXT and UART module clock divider as 1 */
      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);
  
      /* Set UI2C1 multi-function pins */
      SYS->GPB_MFPL = (SYS->GPB_MFPL & ~(SYS_GPB_MFPL_PB1MFP_Msk | SYS_GPB_MFPL_PB2MFP_Msk)) |
                      (SYS_GPB_MFPL_PB1MFP_USCI1_CLK|SYS_GPB_MFPL_PB2MFP_USCI1_DAT0);
  
      /* USCI_I2C clock pin enable schmitt trigger */
      PA->SMTEN |= GPIO_SMTEN_SMTEN11_Msk;
      PB->SMTEN |= GPIO_SMTEN_SMTEN1_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, 0x015, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x15 */
      UI2C_SetSlaveAddr(UI2C0, 1, 0x035, 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);
  
  }
  
  void UI2C1_Init(uint32_t u32ClkSpeed)
  {
      /* Open USCI_I2C1 and set clock to 100k */
      UI2C_Open(UI2C1, u32ClkSpeed);
  
      /* Enable I2C1 10-bit address mode */
      UI2C_ENABLE_10BIT_ADDR_MODE(UI2C1);
  
      /* Get USCI_I2C1 Bus Clock */
      printf("UI2C1 clock %d Hz\n", UI2C_GetBusClockFreq(UI2C1));
  
      /* Set USCI_I2C1 Slave Addresses */
      UI2C_SetSlaveAddr(UI2C1, 0, 0x116, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x16 */
      UI2C_SetSlaveAddr(UI2C1, 1, 0x136, UI2C_GCMODE_DISABLE);   /* Slave Address : 0x36 */
  
      /* Set USCI_I2C1 Slave Addresses Mask */
      UI2C_SetSlaveAddrMask(UI2C1, 0, 0x04);                    /* Slave Address : 0x4 */
      UI2C_SetSlaveAddrMask(UI2C1, 1, 0x02);                    /* Slave Address : 0x2 */
  
      /* Enable UI2C1 protocol interrupt */
      UI2C_ENABLE_PROT_INT(UI2C1, (UI2C_PROTIEN_ACKIEN_Msk | UI2C_PROTIEN_NACKIEN_Msk | UI2C_PROTIEN_STORIEN_Msk | UI2C_PROTIEN_STARIEN_Msk));
      NVIC_EnableIRQ(USCI1_IRQn);
  
  }
  
  int32_t Read_Write_SLAVE(uint16_t slvaddr)
  {
      uint32_t i;
  
      /* Init Send 10-bit Addr */
      g_u8DeviceHAddr = (slvaddr>>8)| SLV_10BIT_ADDR;
      g_u8DeviceLAddr = slvaddr&0xFF;
  
      for (i = 0; i < 0x100; i++)
      {
          g_au8MstTxData[0] = (uint8_t)((i & 0xFF00) >> 8);
          g_au8MstTxData[1] = (uint8_t)(i & 0x00FF);
          g_au8MstTxData[2] = (uint8_t)(g_au8MstTxData[1] + 3);
  
          g_u8MstDataLen = 0;
          g_u8MstEndFlag = 0;
  
          /* USCI_I2C function to write data to slave */
          s_UI2C0HandlerFn = (UI2C_FUNC)UI2C_MasterTx;
  
          /* USCI_I2C as master sends START signal */
          m_Event = MASTER_SEND_START;
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_STA);
  
          /* Wait USCI_I2C Tx Finish */
          while (g_u8MstEndFlag == 0);
          g_u8MstEndFlag = 0;
  
          /* USCI_I2C function to read data from slave */
          s_UI2C0HandlerFn = (UI2C_FUNC)UI2C_MasterRx;
  
          g_u8MstDataLen = 0;
          g_u8DeviceAddr = slvaddr;
  
          m_Event = MASTER_SEND_START;
          UI2C_SET_CONTROL_REG(UI2C0, UI2C_CTL_STA);
  
          /* Wait USCI_I2C Rx Finish */
          while(g_u8MstEndFlag == 0);
          g_u8MstEndFlag = 0;
  
          /* Compare data */
          if (g_u8MstRxData != g_au8MstTxData[2])
          {
              printf("USCI_I2C Byte Write/Read Failed, Data 0x%x\n", g_u8MstRxData);
              return -1;
          }
      }
      printf("Master Access Slave (0x%X) Test OK\n", slvaddr);
      return 0;
  }
  
  
  int main()
  {
      uint32_t i;
  
      /* Unlock protected registers */
      SYS_UnlockReg();
  
      /* Init System, IP clock and multi-function I/O. */
      SYS_Init();
  
      /* Lock protected registers */
      SYS_LockReg();
  
      /* 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        |\n");
      printf("|  10-bit address Slave (Loopback)                      |\n");
      printf("+-------------------------------------------------------+\n");
  
      printf("\n");
      printf("Configure UI2C0 as a master, UI2C1 as Slave.\n");
      printf("The I/O connection for UI2C0:\n");
      printf("UI2C0_SDA(PC1), UI2C0_SCL(PC0)\n");
      printf("UI2C1_SDA(PA2), UI2C1_SCL(PA3)\n");
  
      /* Init USCI_I2C0, USCI_I2C1 */
      UI2C0_Init(100000);
      UI2C1_Init(100000);
  
      s_Event = SLAVE_H_WR_ADDRESS_ACK;
      UI2C_SET_CONTROL_REG(UI2C1, (UI2C_CTL_PTRG | UI2C_CTL_AA));
  
      for(i = 0; i < 0x100; i++)
          g_u8SlvData[i] = 0;
  
      /* I2C1 function to Slave receive/transmit data */
      s_UI2C1HandlerFn = UI2C_LB_SlaveTRx;
  
      /* Master Access Slave with no address mask */
      printf("\n");
      printf(" == No Mask Address ==\n");
      Read_Write_SLAVE(0x116);
      Read_Write_SLAVE(0x136);
      printf("SLAVE Address test OK.\n");
      /* Master Access Slave with address mask */
      printf("\n");
      printf(" == Mask Address ==\n");
      Read_Write_SLAVE(0x116 & ~0x04);
      Read_Write_SLAVE(0x136 & ~0x02);
      printf("SLAVE Address Mask test OK.\n");
  
      while(1);
  }
  
  /*** (C) COPYRIGHT 2016 Nuvoton Technology Corp. ***/
  